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					   Code for Sustainable Homes
Technical Guidance Frequently Asked Questions
                  Database




                                         First edition, August 2011
                               Document Summary

This document lists Frequently Asked Questions relating to the various technical
issues within the Code for Sustainable Homes (the Code) and also to the process of
carrying out an assessment.

In order to navigate the Frequently Asked Questions, they are they are split into
category sections which mirror those of the Code, and into issue sections within each
category.

Please note: The Frequently Asked Questions are in a tabular format. If you have a
query which relates to a specific category of the Code, click on the appropriate
coloured tab at the foot of this document, then scroll down to look for the Q & A that is
mosty applicable to you.
                                                                                                                                                                                                                                       Version
Issue                                FAQ                                                                                            Answer
                                                                                                                                                                                                               Apr-07   Oct-07   Apr-08    Oct-08   May-09   Nov-10
                                                                       Yes, holiday homes can be assessed under the Code as long as they are new build and self-contained (assessed against
        Can holiday homes be assessed under the Code for
                                                                       ADL1a). However it is likely that homes which are not intended to be used as a main residence will not score well in certain areas,
 N/A    Sustainable Homes (the Code)?                                                                                                                                                                            P        P        P         P        P        P
                                                                       for example Ene 9 - Home office.


                                                                       No. The design stage assessment is optional. You can go straight to the post construction assessment.

                                                                       However the design stage assessment is recommended, especially for developments where the developer is unfamiliar with the
        Do I have to undertake a Design Stage assessment for Code      Code requirements and assessment process. A design stage assessment is particularly helpful in demonstrating that the
 N/A    for Sustainable Homes?                                         development design will meet the requirements of the desired Code level, and the clients targets. This will allow for any changes         P        P        P         P        P        P
                                                                       required to achieve the desired level to be incorporated as early as possible, and with minimal cost and disruption. If the design
                                                                       stage assessment is not performed, and the post construction assessment highlights shortcomings, then the desired Code level
                                                                       may not be achieved and / or delays and additional costs may occur as a result.


                                                                       In some circumstances it is possible to register separate sites together depending on their proximity. We consider such
        Is it acceptable to register separate sites together as one    registrations on a case by case basis, if you wish to have the development you are assessing considered, please submit detailed,
 N/A    registration?                                                  marked up site plans as a technical query to the Code Service provider.                                                                   P        P        P         P        P        P



        Is the Post Construction Stage assessment conducted under Yes. When you register a project it will registered against a particular scheme and version, therefore this is the one that we will
 N/A    the same version as the registered Design Stage assessment? require compliance with at both design and post contraction stages.                                                                          P        P        P         P        P        P


                                                                       No. Please review page 27 - 29 of the current Technical Guidance for more information on post-construction stage assessments
                                                                       and some of the protocols for carrying out site inspections. In particular, "the assessor organisation shall be satisfied that
                                                                       commitments made [at the design stage] have been achieved and should carry out an appropriate level of checking to achieve
                                                                       this." A degree of professional judgement is needed to determine what is designated as "an appropriate level" and if site visits
                                                                       (and thus reports) are even necessary.

        Is there a template / proforma for the Code Assessor Site      We have no template to be used for a site inspection report. Some assessor have a checklist they tick and then sign while others
 N/A    inspection Report?                                                                                                                                                                                       P        P        P         P        P        P
                                                                       prefer to produce a written report. We suggest you clarify with the client which approach they favour. We can accept either
                                                                       provided the checklist also provides site specific comment on the specification being checked. - For instance it would not be
                                                                       sufficient to simply sign off "a heat loss parameter of 1.1" but rather "A heat loss parameter of 1.1 generated through the following
                                                                       building envelope specification: cavity wall with 150mm Rockwool insulation.....".

                                                                       Professional judgement is required for this process. It should also be noted that this approach should be taken for all other Issues
                                                                       checked via site inspection. We have heard instances of assessors checking the flow rate of installed taps; please understand
                                                                       you are only required to check what has been designed has been installed, not measure in-use performance.
                                                                                                                                                                                                                                     Version
Issue   FAQ                                                                                                                         Answer
                                                                                                                                                                                                             Apr-07   Oct-07   Apr-08    Oct-08    May-09   Nov-10
                                                                        Ene 1 performance requirements in the November 2010 version of the scheme are equivalent to those in previous versions.
                                                                        However, they have been adjusted to account for changes to the 2010 version of Part L.

                                                                        Given that the target emission rate (TER), the baseline from which Ene 1 performance is measured, has improved by 25% in
                                                                        the 2010 version of Part L the following adjustments have been made:

                                                                        • Requirements previously set between a 10% to 25% improvement over the Part L 2006 target emission rate have been
                                                                        removed as they are now below the regulatory minimum.
        Why do the Ene 1 performance requirements in the November
Ene 1                                                                   • Requirements previously set above a 25% improvement over the Part L 2006 target emission rate have been converted to                                                                P
        2010 scheme version differ from those in all of the previous
                                                                        account for the fact that the 2010 target emission rate has improved by 25%. However, in reality the converted requirements
        versions?
                                                                        are equivalent to meeting the same targets set out in previous versions.

                                                                        The following formula was used to convert pre-2010 performance requirements to account for the 25% improvement in the
                                                                        2010 targert emission rate:

                                                                        (Original Benchmark - 25) x (100/75) = Adjusted Benchmark



                                                                        A sliding credit reward scale has been introduced to issues Ene 1 and 2. Credits are split into increments of 0.1 credits,
                                                                        distributed equally between the performance benchmarks published in the Technical Guidance.

                                                                      The intention of this approach is to improve the sensitivity of the scale to small improvements and avoid the situation where
        The November 2010 versions of the Ene 1 and 2 issues feature
                                                                      it becomes cost effective to downgrade dwelling specifications where performance falls between the main performance
        sliding credit reward scales which is a different approach to
Ene 1                                                                 benchmarks and is not rewarded for doing so until the next benchmark is achieved.                                                                                                       P
        previous versions of the scheme. Can you explain this
        approach?
                                                                      For example, where Level 3 was required in the previous version of Ene 1 and an improvement in dwelling emission rate
                                                                      (DER) over target emission rate (TER) of >25%<31% was achieved, the credit structure meant that it became cost effective
                                                                      to downgrade the specification until only a 25% improvement was achieved.

        Are there circumstances where it is acceptable to apply energy Energy averaging can only be applied to maisonettes where they have flats above them which share the same building
Ene 1                                                                                                                                                                                                          P        P        P             P     P
        averaging to maisonettes?                                      envelope and services strategy.
                                                                       For dwellings within the same building envelope (i.e. blocks of flats), the dwelling emission rate (DER) and target emission
                                                                       rate (TER) results can be averaged across the whole block, provided that the same building services strategy is adopted
                                                                       throughout. These dwellings are then part of an Energy Group. Where varying servicing strategies (including the provision of
        Can you clarify when an Energy Group can be used and what it renewable energy systems) are adopted in the block, dwellings should be grouped by strategy. Each group will be treated as
Ene 1                                                                                                                                                                                                          P        P        P             P     P
        includes.                                                      a separate Energy Group for the purpose of assessment and an average dwelling emission rate and target emission rate
                                                                       used to calculate the percentage improvement across that Energy Group. The rules for creating an Energy Group are
                                                                       explained under Ene 1 in the Technical Guide.

        I am assessing two flats that are within the same building
        envelope and are covered by the same building services
        strategy. They have both achieved a different % improvement     Energy averaging is an option which is available for assessors to use at their discretion.
Ene 1                                                                                                                                                                                                          P        P        P             P     P
        of dwelling emission rate (DER) over target emission rate
        (TER). Should I apply energy averaging or assess them
        separately?


                                                                        It is difficult to achieve emissions compliance targets in some types of dwellings, particularly mid-floor, mid-terrace flats, due
                                                                        to the fact that the distribution of energy end uses is weighted towards those that are difficult to reduce, such as water
                                                                        heating. These types of dwellings also have relatively small amounts of external fabric, making it more difficult to improve
                                                                        energy performance through cost effective changes to the heat loss envelope. This is despite the fact that these types of
                                                                        dwelling are inherently energy efficient.
Ene 1   Why is energy averaging permitted in flats/apartments?                                                                                                                                                 P        P        P             P     P        P
                                                                        Energy averaging, which is also present in Building Regulations, allows the calculated energy performance of better
                                                                        performing dwellings to be used to offset that of the poorer performing dwellings, to ensure compliance with emissions
                                                                        reduction targets. In the context of the Code for Sustainable Homes the energy averaging allowance seeks to provide a more
                                                                        level playing field for all types of dwellings



        What Heat Loss Parameter (HLP) must a dwelling have in
Ene 2                                                                   Dwellings must have a heat loss parameter of 0.8 W/m2K or less to achieve code level 6                                                 P        P        P             P     P
        order to achieve code level 6?
                                                                            A sliding credit reward scale has been introduced to issues Ene 1 and 2. Credits are split into increments of 0.1 credits,
                                                                            distributed equally between the performance benchmarks published in the Technical Guidance.

                                                                            The intention of this approach is to improve the sensitivity of the scale to small improvements and avoid the situation where
        The 2010 versions of the Ene 1 and 2 issues feature sliding         it becomes cost effective to downgrade dwelling specifications where performance falls between the main performance
Ene 2   credit reward scales which is a different approach to previous      benchmarks and is not rewarded for doing so until the next benchmark is achieved.                                                                            P
        versions of the scheme. Can you explain this approach?
                                                                            For example, where Level 3 was required in the previous version of Ene 1 and an improvement in dwelling emission rate
                                                                            (DER) over target emission rate (TER) of >25%<31% was achieved, the credit structure meant that it became cost effective
                                                                            to downgrade the specification until only a 25% improvement was achieved.

        Do light fittings within fixtures / glass fronted
                                                                            When assessing 'fixed' internal light fittings in habitable rooms, all light fittings fixed directly to the structure of the dwelling
        cupboards/cabinets need to be assessed when calculating the
Ene 3                                                                       and/or within fixtures that are fixed directly to the structure of the dwelling and that are wired directly into the mains electricity   P   P   P   P   P
        percentage of dedicated energy efficient light fittings within a
                                                                            supply, should be included in the assessment.
        dwelling?
        How should a track of lights containing several lamps be
Ene 3                                                                       A track of lights should be counted as one fitting, regardless of the number of lamps it contains.                                       P   P   P   P   P
        accounted for?
        The definition of a correctly specified Energy Display Device       The technical guide does not state that this information would need to be provided by the energy supplier. As long the device
        states that the device must ‘Display accurate account balance       can display account balance information, regardless of the source of the tariff information, it would be deemed to be
Ene 3   information (amount in credit or debit). Does the device have to    compliant with the current Code requirements. This means that a device which allows a customer to input tariff data on a                                     P
        show real time data from the energy supplier to meet to this        display device (in the same way that the user can input tariff information to web/phone applications at present) would be
        definition?                                                         deemed compliant.
                                                                            No, a portable drying rack is not suitable as it could easily be removed by the occupants, and thus not be available for future
                                                                            occupants. Also, the occupant would be able to move the drying rack and use it in other rooms which are not sufficiently
Ene 4   Are portable clothes drying racks acceptable?                                                                                                                                                                P   P   P   P   P   P
                                                                            ventilated.

        Can towel rails be used in place of a drying line, or be used to
Ene 4                                                                       No. The drying line provided must be a dedicated clothes drying line. Towel rails are not compliant.                                     P   P   P   P   P   P
        make up part of the required length of drying line?
                                                                            No it is not necessary to provide a rotary dryer for each dwelling. Drying facilities can be provided communally. The
        In a block of flats is it necessary to provide a rotary dryer for   requirement is based on line length, per dwelling, so the total line length would have to add up to that required by all
Ene 4                                                                                                                                                                                                                P   P   P   P   P   P
        each dwelling?                                                      dwellings. Alternatively, internal drying space could be provided.

        Where continuous whole house ventilation is specified it is not
                                                                          The rate of 30l/s is only applicable to intermittent extract systems. Where whole house continuous extract ventilation is
        possible to achieve an intermittent ventilation rate of 30l/s in
                                                                          specified the minimum high rate of ventilation in the room used for clothes drying must be 13l/s i.e. equivalent to kitchens as
Ene 4   the room used for clothes drying. Is it necessary to install                                                                                                                                                                     P
                                                                          per the intermittent extract rate.
        separate intermittent ventilation where continuous ventilation is
        specified?
                                                                       There is no difference between the private and social housing. All housing needs to be provided with white goods, whether
        For developments with a mixture of private and social housing, social or private, in order to obtain two credits. Where a dryer is not provided, the credit may still be awarded provided that all
Ene 5                                                                                                                                                                                                                P   P   P   P   P   P
        what is necessary to achieve the credits?                      other white goods are supplied to the required ratings, and information on the purchasing of energy efficient white goods is
                                                                       provided
                                                                            The DEFRA leaflet that can be used for compliance with the Code for Sustainable Homes Ene 5 issue can be found at the
        Where can I find the DEFRA EU Energy Labelling leaflet that
Ene 5                                                                       following link: http://www.defra.gov.uk/environment/business/pdf/shoppers-guide.pdf                                                      P   P   P   P   P   P
        can be used to meet the requirements of Ene 5?
                                                                            Where one or more of the following applies to a development being assessed for Ene 6;


                                                                            • Compliance with Secure By Design is required
                                                                            • Man 4 credits are sought
                                                                            • Compliance with Lifetime Homes is required
                                                                            • Hea 4 credits are sought
        Secured by Design requires that external security lights are        • Communal stairwells are present
Ene 6                                                                                                                                                                                                                P   P   P   P   P   P
        fitted with DTD timers - is this compliant under Ene 6?             • Communal corridors are present
                                                                            • Lobbies with stairwells and corridors


                                                                            Lighting design for the affected areas should follow the requirements of the standard(s) applicable or CIBSE LG9, and
                                                                            should not compromise the safety of any persons using the building.
                                                                          As air source heat pumps (ASHPs) are recognised under Ene 7. Any technology recognised by the Department of Energy
                                                                          and Climate Change (DECC) 'low carbon building programme' can contribute to the award of credits under Ene 7. For more
                                                                          information see the Low Carbon Buildings link below.

                                                                  Where any one of these technologies are covered by the Microgeneration Certification Scheme (MCS) the product will be
                                                                  required to be certified by MCS to qualify for recognition under Ene 7, this is stated on pages 79-81of the Oct 08 Code
        Are Air Source Heat Pumps (ASHP) recognised under the Ene
Ene 7                                                             technical guide. You can check what is covered by following the Green Book Live link below.                                               P   P   P   P   P
        7 Issue?
                                                                          Some Air-Sourced Heat Pumps use an electric element to pre-heat incoming air, which is then recovered and recycled.
                                                                          Where grid-electricity fed resistance heating elements are used, such technologies would not be accepted under Ene 7. If
                                                                          another low or zero carbon (LZC) technology provides renewable electricity for this primary heating, the system can be
                                                                          recognised under Ene 7 - subject to appropriate evidence being provided to demonstrate the provision of renewable
                                                                          electricity
                                                                          No, to contribute to a reduction in the dwelling emission rate any photo-voltaics (PVs) must first supply the dwelling(s) under
                                                                          assessment. However, any surplus electricity can be fed back to the grid and accounted for as if were used in the dwelling.
        Can a photo-voltaic unit(PV) be connected directly into the       In buildings with multiple dwellings, Photo-Voltaic (PV) can either be connected to dwellings via individual inverters or
Ene 7   national grid in order to offset the dwelling emission rate (DER) connected to the landlords supply via one individual inverter. In the latter case, despite the fact that there is no direct       P   P   P   P   P
        of a dwelling(s)?                                                 connection between the PV and flats in the dwelling, the output of the PV can be used to reduce dwelling emissions. If this
                                                                          approach is utilised the output from the PV must be attributed to each dwelling in the building on the basis of proportional
                                                                          floor area.

                                                                          The averaging allowance in Ene 1 and 2 is based on that present in Part L. It attempts to recognise the increased cost of
                                                                          carbon abatement in flats and the associated increase in difficulty in achieving Ene1 compliance in this type of dwelling. This
                                                                          form of performance averaging represents a departure from the standard Code assessment methodology which, where
                                                                          possible, focuses on individual dwelling performance.

        Can the performance of multiple dwellings be averaged within      The Ene7 calculation methodology differs from Ene1, in that it assesses the sole contribution of low or zero carbons (LZCs)
Ene 7                                                                                                                                                                                                       P   P   P   P   P   ??
        energy groups under Ene 7 as is in Ene 1?                         to overall emissions performance, rather than the contribution of the whole dwelling specification, and does not utilise the
                                                                          target emission rate (TER) as the baseline i.e. built form does not directly determine potential performance. This means that
                                                                          the issue present in Ene1 i.e. the disparity between achieving performance in differing built forms, is not present, negating
                                                                          the requirement for performance averaging and enabling assessment on an individual dwelling basis. In Ene 7 averaging
                                                                          only occurs in respect of the outputs of communal systems which, where present, are attributed as per the requirements in
                                                                          Appendix M.
                                                                          In order to gain credits under Ene 7 it is necessary to use technologies that comply with the BERR list of recognised low or
                                                                          zero carbon (LZC) technologies and where any one of these technologies is covered by the Microgeneration Certification
                                                                          Scheme (MCS) * then the product will be required to be certified by MCS to qualify for recognition under Ene 7, this is stated
                                                                          on pages 79-81 of the Oct 08 Code technical guide.

                                                                          * http://www.greenbooklive.com/search/search.jsp?sectionid=10063&par tid=10016

        Could you please clarify whether NIBE products count as low to NIBE Exhaust Air Heat Pumps are (as we understand them) mechanical ventilation with heat recovery (MVHR) systems
Ene 7   zero carbon (LZCs) for the purpose of Ene 7 in the code for    incorporating air-sourced heat pump (ASHP) technology and therefore fall under the definition of a recognised technology.            P   P   P   P   P
        Sustainable Homes?
                                                                       We have NIBE's declaration that only the Fighter 410 preheats incoming air, the 360 and 200 do not provide pre heated
                                                                       incoming air. If the system that is specified on your project uses the 360 or 200 you can use these to score credits in Ene 7.
                                                                       The 410 cannot be used to score credits. For any other models you will need to contact NIBE to confirm the initial heat
                                                                       source. If resistance heating elements are being used to prime the incoming air for the dwelling, these would not be accepted
                                                                       under Ene 7. Ensure that you provide the manufactures technical data in your evidence to demonstrate it doesn't use
                                                                       electricity as its primary heat source if the air-sourced heat pump (ASHP) proves acceptable. Please note if another
                                                                       renewable technology provides the electricity for the primary heating of an exhaust air source heat pump then the system
                                                                       Where the Local Planning Authority have made the use of a particular and named low to zero carbon (LZC) technologies (as
                                                                       recognised by the Low Carbon Building Programme [LCBP]) as part of a legally binding planning obligation, such as a
                                                                       Section 106 agreement, a feasibility study is not required under the Ene 7 Issue to justify its use. As evidence of this it is
        Does a feasibility study have to be completed for low to zero
                                                                       necessary to provide a copy of the associated 106 agreement/other legally binding planning condition in place of a feasibility       P   P   P   P   P
Ene 7   carbon (LZC) technologies required by a section 106
                                                                       study or confirmation of LCBP funding.
        agreement?
                                                                     Any other low top zero carbon (LZC) energy technology not part of this agreement but contributing to performance under Ene
                                                                     7 WILL need to demonstrate either funding under the LCBP has been achieved or that use has been endorsed by a
        Is the benefit of Flue Gas Heat Recovery (FGHR) / Mechanical
        Ventilation with Heat Recovery (MVHR) be recognised by the No. Mechanical Ventilation with Heat Recovery (MVHR) or Flue Gas Heat Recovery (FGHR) is not recognised on the BERR
Ene 7   Ene 7 calculation procedure?                                 list of microgeneration technologies, only technologies on this list are eligible to contribute to Ene 7 performance according         P   P   P   P   P
                                                                     to the current methodology. However, the benefit of these technologies is recognised in Issue Ene 1.

                                                                    No. The target emission rate (TER) is not used in the Ene 7 performance calculation and does not directly relate to standard
        Should the TER always be the same as Standard Case          case emissions. Ene 7 performance is calculated by comparing emissions from the dwelling as designed, with the dwelling
Ene 7                                                                                                                                                                                                       P   P   P   P   P
        emissions?                                                  as designed albeit including a standard systems specification to give an indication of the contribution from any specified low
                                                                    or zero carbon (LZCs).
                                                                    The CEN Keymark scheme can be considered as an equivalent to the Microgeneration Certification Scheme for roof/building
        Are products certified under the CEN Keymark Scheme but not
                                                                    mounted products. However, roof integrated systems are only eligible to achieve credits against the requirements of issue
Ene 7   under the Microgeneration Certification Scheme eligible to                                                                                                                                                                   P
                                                                    Ene 7 where they are certified against the Microgeneration Certification Scheme.
        achieve credits against issue Ene 7?
                                                                          According to EU Directive 2009/28/EC ‘Energy from renewable sources’ means energy from renewable, non-fossil sources
                                                                          namely wind, solar, aerothermal, geothermal, hydrothermal and ocean energy, hydropower, landfill gas, sewage treatment
                                                                          plant gas and biogases.

                                                                          Provided all other requirements are met (Microgeneration Certification Scheme (MCS) / Combined Heat & Power Quality
                                                                          Assurance (CHPQA) certification where applicable and the system can be modelled in SAP) the following technologies are
                                                                          eligible to contribute to performance against issue Ene 7 (note that this list will be updated on an ongoing basis to ensure
                                                                          alignment with the European Union (EU) Directive and emerging technologies):
                                                                          • Solar Photovoltaic (PV)

                                                                          • Solar Thermal Water Heating

                                                                          • Small and Micro Wind Turbines

        What technologies are eligible to contribute to Ene 7             • Small Scale Hydro Electric Generators
Ene 7                                                                                                                                                                                                                             P
        performance?
                                                                          • Biomass (Solid) Fuelled Heating

                                                                          • Biofuel (Liquid) Fuelled Heating
                                                                          (Note: Appliances able to use mineral oil or liquid biofuel are subject to the same emissions factor as those only able to use
                                                                          mineral oil only in SAP 2009. Therefore, no advantage would be gained from using an appliance of this type when assessing
                                                                          performance against the requirements of Ene 7).

                                                                          • Biogas (Gas) Fuelled Heating
                                                                          (Note: The EU directive sets out minimum requirements related to the responsible sourcing of first generation biofuel.
                                                                          However, at the time of writing there is no recognised method to demonstrate that these requirements have been met. Until a
                                                                          method is available the ancillary requirements applicable to the responsible sourcing of first generation biofuel do not apply
                                                                          when assessing compliance with issue Ene 7).

                                                                          • Air/Ground/Water Source Heat Pumps
                                                                          (Note: The EU Directive sets out minimum efficiency requirements for heat pumps. However, at the time of writing there is no
        Do low to zero carbon (LZC) Technologies have to be installed     Yes, where applicable, an Mircogeneration Certification Scheme (MCS) approved product and installer must be used. A list
Ene 7   by an Microgeneration Certification Scheme (MCS) approved         of approved products and installers plus the current scope of the MCS scheme can be found at                                                            P
        installer to award credits under ENE 7?                           www.micrognerationcertification.org
                                                                          Sheds are considered as non-solid structures and an entrance lock and secure fixings will need to be provided to comply
        Are sheds classed as non-solid or solid structures under this
Ene 8                                                                     with the requirement for Secure Storage.                                                                                            P   P   P   P   P   P
        Issue?
                                                                          It is clear that alone, the eyelets would not allow for both frame and wheel to be locked simultaneously using a conventional
                                                                          bike lock. Good practise is to provide a fixing that can adequately support cycles in an upright position and provide a fixing
        I am assessing a shed that has ringlets set in concrete - does    point in immediate proximity to the cycle's wheel and frame (i.e. a 'Sheffield' type). For a ringlet to comply as a secure fixing
Ene 8                                                                                                                                                                                                         P   P   P   P   P   P
        this comply as a secure fixing under the guidance?                supplementary fixings must be installed to provide a solution that allows both frame and wheel to be locked simultaneously
                                                                          using a conventional bike lock (consider this as a 'd lock').

                                                                          Yes. Non-fully enclosed structures can meet the requirements of issue Ene 8. They must be adequately sized and provided
        Is it possible for non-fully enclosed structures to meet the
Ene 8                                                                     with secure fixings and have adequate protection from the elements, which would normally mean that they have at least a                                 P
        requirements of the November 2010 version of this issue?
                                                                          roof and three walls.
        Are the requirements for cycle storage applicable to              Yes. Many retired people do still cycle, so unless the development is more of a care home (in which case a Multi-Residential
Ene 8                                                                                                                                                                                                         P   P   P   P   P   P
        developments designed for older people?                           assessment may be better suited), storage for cycles is still required.
        In Ene 8 where it says 3 cycles: 2m long x 2.5m wide is this
Ene 8                                                                     No it is not correct. This is a typo it should read 4 cycles: 2m long x 2.5m wide.                                                      P
        correct?
                                                                         Locating cycle storage facilities under the stairs for a block of flats would be acceptable provided the storage is secure, safe,
        Is it acceptable to provide cycle storage space under the stairs weather-proof, adequately sized and within convenient access according to the definitions provided in the Technical
Ene 8                                                                                                                                                                                                         P   P   P   P   P   P
        within a block of flats?                                         Guidance.

        The definition of a secure fixing suggests that it is now only    A hanging fixing can be deemed to meet the secure fixing definition providing it is fixed to the structure of the building and
Ene 8   acceptable to provide a ground anchor. Can hanging fixings        allows for both the wheel and frame to be locked.                                                                                                       P
        still meet the secure fixing requirement?
        Is it acceptable to secure 2 cycles to one 'Sheffield' type
Ene 8                                                                     Yes, one ‘Sheffield’ type frame can be used to secure 2 cycles.                                                                     P   P   P   P   P   P
        frame?
                                                                          As stated in the guidance, the room designated as a home office must have a daylight factor of at least 1.5% to comply. This
        Does the entire room being used a home office need to meet        should be the average daylight factor for the entire room, calculated using the method outlined in Hea 1. This change was
Ene 9                                                                                                                                                                                                                 P   P   P   P
        the daylighting requirements?                                     brought in for the April 08 update to meet the need to build work spaces with a minimum quality daylight standard for
                                                                          occupiers.
                                                                          In all cases, the room must be large enough not to prevent the intended use of that room i.e. if a home office is to be set up
                                                                          in the main bedroom that room must also be able to fit a double bed and other necessary furnishing.

                                                                          Where a room must also serve as a bedroom, furniture allowances should be based upon those required by the Housing
                                                                          Corporation's (now HCA) Housing Quality Indicator Scheme:
                                                                          Double bedroom
                                                                          Double bed 2000x1500 or 2 singles 2000x900
                                                                          bedside table 400x400
                                                                          chest of drawers 450 x750
                                                                          table 500x1050 , and chair/stool
                                                                          double wardrobe 600x1200 – could be built in
                                                                          occasional cot space 600x1200 for family dwelling
                                                                          Twin bedroom
        How much space needs to be in a bedroom intended to be            single bed 2000x900
Ene 9                                                                     bedside table 400x400                                                                                                              P   P   P   P   P   P
        used as a home office?
                                                                          chest of drawers 450 x750
                                                                          table 500 x 1050, and chair/stool
                                                                          double wardrobe 600x1200 (or two singles) could be built in
                                                                          Single bedroom
                                                                          single bed 2000x900
                                                                          bedside table 400x400
                                                                          chest of drawers 450 x750
                                                                          table 500 x 1050 and chair/stool
                                                                          single wardrobe 600x600 – could be built in

                                                                          Where the relevant amount of furniture can be provided along with "sufficient space" [as defined by the Technical Guidance
                                                                          Manual] for the home office, this solution would be eligible under the Code. Check to see if furniture can be fitted into the
                                                                          bedroom and that there is 1.8m of wall space with room for a desk, chair and filing cabinet/book shelf (in addition to the items
                                                                          of furniture outlined above).
                                                                          At the design stage:

                                                                          Calculations signed-off by the developer to demonstrate:

                                                                          Average daylight factor using the formula provided in the Relevant Definition section (method described in Littlefair (1998) as
                                                                          set out in BS 8206–2) or computer simulation or scale model measurements.

                                                                          At the post construction stage:
        In the requirements for Ene 9 Home Office, it states that the
                                                                      Where Post Construction Stage assessment only, calculations (as listed for Design Stage) representing the dwellings as
        window chosen to be a home office must have a daylight factor
                                                                      built or on-site measurements as below.
        of at least 1.5%. What evidence will need to be provided to
Ene 9                                                                                                                                                                                                        P   P   P   P   P   P
        confirm this? Will a worst case assessment be sufficient? Or
                                                                      OR A letter from the developer confirming that the dwellings have been built as detailed at Design Stage.
        does each individual dwelling type need to be assessed? Will
        the view of sky need to be calculated?
                                                                      OR Where different from Design Stage, calculations verified by the developer for all dwellings as built.

                                                                          OR On-site measurements (methodology detailed in BRE IP 23/93) in the same rooms assessed at design stage (required
                                                                          when scale model measurements were carried out at Design Stage).

                                                                          Daylighting experts may choose to assess only rooms in dwellings at the 'limits of compliance'. This will need to be
                                                                          accompanied by justification over why any other dwellings without calculations would achieve the ADF (for instance they are
                                                                          on a higher floor or face less obstacles).

                                                                          No, providing there is satisfactory evidence indicating there is a broadband service to the property (i.e. ADSL enabled
        Providing there is evidence that the property is connected to a
                                                                          exchange/cable service with dedicated socket), then one phone socket is sufficient. However, this connection must be
Ene 9   broadband exchange, is there a need to have two telephone                                                                                                                                            P   P   P   P   P   P
                                                                          available in the area designated as a home office to comply.
        points in the designated Home Office?
                                                                                                                                                                                                                                           Version
Issue                                  FAQ                                                                                               Answer
                                                                                                                                                                                                                   Apr-07   Oct-07   Apr-08    Oct-08   May-09   Nov-10
                                                                            Typical current specifications will not result in any credits. There has been a step change in this credit with the overall aim of
                                                                            encouraging significant water use reductions, and more efficient technologies. (Currently an example of how to achieve level 3
Wat 1   Achieving any credits for Wat 1 is difficult. Why is this?          is with a 4/2 litre dual flush WC, 8 litre shower, 4 litre kitchen sink tap, 3 litre wash hand basin tap, 140 litre bath and typical     P        P        P         P
                                                                            white goods with no bidet, water softener or grey/rain water recycling).

        Can a best practice dishwasher or washing machine be                No, where a dishwasher or washing machine is specified, the actual water consumption can be entered; otherwise the typical
Wat 1   assumed if the occupier has been provided with information on       value should be used.                                                                                                                    P        P        P         P
        energy labelled goods?
                                                                            No, neither DCLG or the Code service provider are able to provide advice on specific products. A number of third party
                                                                            certification schemes are under development to provide confidence to the specifier. We will advise assessors when these are
        Can advice be provided on specific products or manufacturers
Wat 1                                                                       specified. You can refer to the Green Book Live for a list of manufacturers or the Water Efficient Product Labelling Scheme              P        P        P         P        P        P
        of products which conform to the water requirements?
                                                                            website: http://www.water-efficiencylabel.org.uk/

                                                                            Any type of flow restrictor will be accepted under the code provided it is not easily removed and is placed on pipework
        Can flow restrictors be used on the pipework feeding end            immediately before the fitting (i.e. not before the storage tank). The standard evidence requirements apply. Please Note -
Wat 1                                                                                                                                                                                                                P        P        P         P        P        P
        fittings as opposed to being integrated into the fitting itself?    Isolation valves set partially closed are not acceptable as flow restrictors.


                                                                            No, the Water Efficiency Calculator for New Dwellings is only applicable to the May 2009 and later versions of the Code
        Does the retrospective applicability of the revised evidence
                                                                            Technical Guide. The retrospective applicability referred to is just in relation to the form of evidence set out in the schedule of
        requirements as detailed in Code Technical Note 002 mean that
                                                                            evidence requirements. In previous versions of the Code, the water calculator is that used for that particular version. The
Wat 1   the 'Water Efficiency Calculator for New Dwellings' (as used in                                                                                                                                              P        P        P         P        P        P
                                                                            revised evidence needs to be read in conjunction with the relevant version of the Technical Guide. All criteria and spreadsheet
        the May 2009 version of the Code), can be retrospectively
                                                                            tools applicable to each version still apply, it is only the types of evidence accepted that applies retrospectively. For Wat1, it
        applied to previous versions?
                                                                            will be a completed copy of the water calculator relevant to the particular version of the Code being used.
                                                                    This would be assessed as one washing machine in each dwelling, with the pre-determined litres/person/day. Although the
        How would a shared laundry room containing only one washing washing machine is shared, this will not alter the number of times the occupants of the building are going to wash their
Wat 1                                                                                                                                                                                                                P        P        P         P        P        P
        machine supplying a whole block of flats be assessed?       clothes.

        I have achieved less than 105 litres net internal water             A common error is that the description field has not been filled out and this is a mandatory field. Please check this and if you
        consumption, filled in details for all the fittings, but the        are still having problems check you have downloaded the latest version of the calculator and if it is still not working email us a       P        P        P         P
Wat 1
        spreadsheet is not showing a gross internal water consumption       copy of your calculator tool for us to review.
        figure and therefore no credit score.
        If I have shower flow rates quoted by a manufacturer for hot,
Wat 1                                                                       The flow rate used should be that quoted at a delivered water temperature of 37 degrees at a pressure of 3 Bar.                          P        P        P         P
        cold and hot and cold combined. Which should I use?
        If you have several types of water fittings, do you use the         If you are doing manual calculations you would use proportions, for the example given you would use a proportion of 0.5 for
        proportion of each type, or should you use the quantity of each     each tap. When using the excel calculator tool, you should enter the quantity of each fitting. The calculator will automatically
Wat 1                                                                                                                                                                                                                P        P        P         P        P        P
        type? e.g. if there are two taps, should you use a ratio of 0.5 :   calculate the average using hidden formulae within the tool.
        0.5 or use a quantity of 1 for each tap.
        Can baths be excluded from a Code assessment if they are in         This cannot be applied to the Code. The Code uses a whole house approach so if a higher capacity bath is provided, other
Wat 1   assisted bathroom where there is a need to specify baths of a       fittings need to be of a more efficient specification.                                                                                   P        P        P         P        P        P
        larger size?
                                                                            Hippo’s are not recognised under the Code as they are not a fixed fitting. They are also not suitable for toilets installed after
        Is the use of Hippos in a standard WC an acceptable way of          2001 when the 6 litre cistern became standard. They should not be used to reduce the flush further than this level, and should
Wat 1                                                                                                                                                                                                                P        P        P         P        P        P
        meeting the requirements for a low-flush volume WC?                 not be used in modern toilets.

        Is there such a thing as approved Code level 3 sanitary             Neither DCLG or the Code service provider approve sanitary specifications to meet levels of the Code, this should be carried
Wat 1                                                                                                                                                                                                                P        P        P         P        P        P
        specifications?                                                     out through the formal Code assessment process assessing the fittings on a whole house approach.
        The May 2009 and subsequent versions of the Code use the            The Water Efficiency Calculator for New Dwellings can only be used for the May 2009 version of the Code and subsequent
Wat 1   Water Efficiency Calculator for New Dwellings. Can this new         versions.                                                                                                                                P        P        P         P        P        P
        calculator be used for previous versions of the Code.
                                                                            Wat 1 is not affected by the provision of a mains fed pool, hot tub, or other large water using features as these are assessed
        What effect would installing a mains fed swimming pool have         under Wat 2. Under Wat 2, the provision of such items would need to be supplied with grey or rainwater in order to achieve
Wat 1                                                                                                                                                                                                                P        P        P         P        P        P
        on achieving water credits?                                         Wat 2.


                                                                            Flow rates in the Water Efficiency Calculator for New Dwellings are specified in accordance with BS EN 1112:2008 for
                                                                            showers and BS EN 200:2008 for taps. Written confirmation from the manufacturer of the flow rates and that they are in
        What shower flow rates are needed for the Water Efficiency
                                                                            accordance with the relevant British Standards is sufficient evidence. For high pressure systems (e.g. mains fed showers), the
Wat 1   Calculator for New Dwellings tool (to be used for May 2009                                                                                                                                                                                        P        P
                                                                            flow rate of showers should be measured at the outlet at a pressure of 3 bar. For low pressure systems (e.g. where fed by a
        assessments and beyond)?
                                                                            header tank), the flow rate should be measured at the outlet at a pressure of 0.1 bar. Showers should be measured at a
                                                                            temperature of 30 degrees centigrade and for taps, the maximum flow rate should be measured under the above conditions.
                                                                            No, this is only needed when doing manual calculations. When you enter both a shower and a bath into the water calculator,
        When the home has a bath and shower, should the number in
                                                                            the calculator automatically adjusts the assumed number of showers and baths per day to 0.6 and 0.4 respectively. The
Wat 1   the home be entered into the calculator as 0.6 for showers and                                                                                                                                               P        P        P         P
                                                                            quantity in the dwelling column should only indicate the number of fittings and not the proportion.
        0.4 for baths?
        Where a shower attachment is mounted above the bath and             This credit addresses water consumed by the use. Therefore, it would be included as both a shower and a bath, but using the
Wat 1   connected to the taps, does this count as just a shower, or as a    following usage per day figures; bath = 0.4, shower = 0.6.                                                                               P        P        P         P
        shower and a bath?
        Where greywater collection is used for flushing WC's in ground This is assessed by selecting the type of toilet used in the greywater tab when indicating which WC/WC's is greywater to be
Wat 1   floor flats, but not upper floor flats, how is this taken into used. In the internal water use tab it is necessary to specify all WC's within the dwelling.                                            P   P   P   P
        account in the water calculator?
                                                                       This is related to the use factors determined in the water use research. The use of a dishwasher is always assumed under the
                                                                       Code. As dishwashers are becoming more widespread in use, the sink use factor has been reduced to take dishwashers into
        Why does the Wat 1 tool not allow for sink water usage to be   account. Dishwashers often have a neutral effect on water consumption unless a more efficient dishwasher is specified which
Wat 1                                                                                                                                                                                                          P   P   P   P   P   P
        reduced if a dishwasher is installed?                          can achieve a saving in water consumption.



                                                                             When a washing machine is not specified, a typical use machine is included in the calculations because the expectation is that
        Why is a washing machine included in the water calculations          most households will purchase one. Even if they didn’t, they would use an alternative water using device to clean their clothes
Wat 1                                                                                                                                                                                                          P   P   P   P   P   P
        when one hasn't been installed?                                      (e.g. communal washing machine), and this would have a water use associated with the dwelling.


        Is it necessary to purchase BS8515 to calculate the yield co-
        efficient that is required for the Water Efficiency Calculator for   No, you can ask the engineer who designed the rainwater harvesting system for the yield co-efficient as they should have used
Wat 1   New Dwellings in situations where rainwater systems are to be        BS8515 to design the rainwater system.                                                                                                            P   P
        used?

                                                                             Yes this is normal. The previous water calculator used in versions of the Code prior to May 2009 was based on historical data
                                                                             in existing homes. The latest version used in the water efficiency calculator for new dwellings has been updated using water
        I've noted that, when inputting identical data, the new water        use data from new homes which reflected a lower water use and a more even use across the range of fittings. The data was
        efficiency calculator for new dwellings is giving reduced water      produced by WRc plc. The updated calculator also incorporates a 'normalisation factor' to align calculated use more closely
Wat 1   consumption compared to previous tool versions. Is this              with typical water use. Typical UK fittings were entered into the updated calculator which indicated 163 litres per person per                    P   P
        normal?                                                              day. A normalisation factor of 0.91 was then incorporated to normalise the calculated use in line with typical UK consumption
                                                                             of 150 litres per person per day. It was important to show this relationship with typical UK consumption as the Code targets
                                                                             are based upon improving upon the average UK consumption of 150 litres per person per day. The normalisation factor may
                                                                             change in the future when updated water use research becomes available.
                                                                             Washer/driers are dealt with in the same way as standard washing machines however; the water consumption figure given on
                                                                             the EU energy label considers the water consumption from both the washing and drying cycles. In some cases the water
                                                                             consumption for the drying cycle can be significant. As per the definitions included in the Water Efficiency Calculator for New
                                                                             Dwellings, the water consumption is derived from the litres per kg dry load which is quoted on the appliance’s EU energy
                                                                             label.

                                                                             All definitions relating to the Water Efficiency Calculator for New Dwellings can be found by following the link below:

        Please can you confirm how washer/dryers are dealt with in the Page 7 states where the consumption of washing machines/washer-dryers must be derived from:
Wat 1   new Water Efficiency Calculator?                                                                                                                                                                                       P   P
                                                                       i. Litres per kilogram of dry load derived from the figure quoted on the EU Energy Label.

                                                                             ii. Where no washing machine is to be provided and therefore consumption figures are unknown, a figure of 8.17 litres per
                                                                             kilogram must be assumed.

                                                                             iii. Where multiple washing machines are specified with various consumptions, the average must be used as set out in section
                                                                             2.5.

                                                                             Please note that for all other scheme versions the water consumption should be taken from the EU energy label as described
                                                                             The normalisation factor is used to align the calculated use with the typical UK water consumption. This is because the water
                                                                             targets are based on an improvement over typical UK water consumption of 150 litres per person per day so there needs to be
        What is the normalisation factor used in Water Efficiency            a relationship between the two. The normalisation factor was derived by looking at the calculated use when using typical UK
Wat 1   Calculator for New Dwellings and how was it derived?                 water fittings compared to the typical UK water consumption of 150 litres per person per day. When tested the calculated use                      P   P
                                                                             is 9% greater than typical consumption so a factor of 0.91 is applied to the calculated use to align the water calculator. As
                                                                             improved data is provided in the future to make the calculated use more accurate of typical consumption, this normalisation
                                                                             factor can be adjusted.
                                                                             The maximum flow rate must be used as measured in accordance with the following:
        What shower flow rates are needed for the Water Efficiency           Flow rate of each shower at the outlet using cold water (T ≤ 30˚ C), in litres per minute measured at a dynamic pressure of
        Calculator for New Dwellings tool (to be used for May 2009           3±0.2 bar (0.3±0.02 MPa) for high pressure (Type 1) supply systems, or at a dynamic pressure of 0.1±0.05 bar (0.01±0.005
Wat 1                                                                                                                                                                                                                          P   P
        assessments and beyond)?                                             MPa) for low pressure (Type 2) supply systems (BS EN 1112:2008, Sanitary tapware. Shower outlets for sanitary tapware for
                                                                             water supply systems type 1 and 2. General technical specifications).

                                                                         This is to ensure that taps and showers are assessed on a like for like basis looking at the design flow rate rather than the
                                                                         actual. This ensures it is the taps efficiency that is being assessed rather than the site pressure.
        Why must a standard 3 bar pressure be used when it is likely to Site pressure is a key consideration in good design of water systems and it is generally recommended that the tap flow rate
Wat 1   vary from this at the site? Why can't the site pressure be used? selected should take account of the site pressure and whether this will allow an acceptable flow rate for users. Consideration                        P   P
                                                                         of site pressure is not something currently required by the Code however this is being reviewed for future versions once an
                                                                         appropriate approach has been developed.
                                                                          As long as all criteria re correct specification and sizing are met, there is nothing in the technical guidance that states a shed
                                                                          cannot be used to collect rainwater for garden irrigation. However, when a dwelling is collecting rainwater from a shed (which
                                                                          will typically have a small catchment area), a minimum collection area is required for the credits to be achieved. For
        Can rainwater butts gain the Wat 2 credit when attached to a
                                                                          compliance with Wat 2, this collection area must be sized in order that a minimum of 9 litres/person/day can be collected.
Wat 2   shed rather than the dwelling?                                                                                                                                                                          P   P   P   P   P   P
                                                                          We advise assessors to use the rainwater calculation in our water calculator tool to determine and/or confirm that the shed
                                                                          roof area specified is sufficiently sized to meet the minimum 9 litres/person/day requirement.


        Does the retrospective applicability of the revised evidence      No, the Water Efficiency Calculator for New Dwellings is only applicable to the May 2009 and later versions of the Code
        requirements as detailed in Code Technical Note 002 mean that     Technical Guide. The retrospective applicability referred to is just in relation to the form of evidence set out in the schedule of
        the 'Water Efficiency Calculator for New Dwellings' (as used in   evidence requirements. In previous versions of the Code, the water calculator is that used for that particular version. The
Wat 2                                                                                                                                                                                                           P   P   P   P   P   P
        the May 2009 version of the Code), can be retrospectively         revised evidence needs to be read in conjunction with the relevant version of the Technical Guide. All criteria and spreadsheet
        applied to previous versions?                                     tools applicable to each version still apply, it is only the types of evidence accepted that applies retrospectively. For Wat1, it
                                                                          will be a completed copy of the water calculator relevant to the particular version of the Code being used.
                                                                          No, there does not need to be any rainwater collecting equipment where only balconies are provided. However, for all
        To achieve the Wat 2 credit, is it necessary to provide water     communal and individual gardens, winter gardens, paved areas such as patios or terraces, the standard guidance
Wat 2                                                                                                                                                                                                           P   P   P   P   P   P
        butts to flats with balconies?                                    requirements apply.

                                                                          Wat 1 is not affected by the provision of a mains fed pool, hot tub, or other large water using features as these are assessed
        What effect would installing a mains fed swimming pool have
                                                                          under Wat 2. Under Wat 2, the provision of such items would need to be supplied with grey or rainwater in order to achieve
Wat 2   on achieving water credits?                                                                                                                                                                             P   P   P   P   P   P
                                                                          Wat 2.
Issue                                 FAQ                                                                                              Answer                                                                                         Version
                                                                                                                                                                                                              Apr-07   Oct-07   Apr-08    Oct-08   May-09   Nov-10

                                                                            No, for the purpose of assessing this credit, lift shaft walls would not be classed as internal walls as they carry out
Mat 1   Are lift shaft walls considered as internal walls?                  significantly different additional structural functions. Lift shaft walls should be ignored for the purpose of the assessment.      P        P        P         P        P        P

        Are there any Green Guide ratings for integrated solar panels
                                                                            Yes, the Green Guide to Specification provides ratings for roof specifications that include integrated solar technology.
Mat 1   / Photo-Voltaics (PVs)?                                                                                                                                                                                 P        P        P         P        P        P

        Can a list of manufacturers who provide A-rated materials in        No, the Green Guide looks at typical specifications for walls, floors, windows etc and rates them accordingly using generic
Mat 1   line with the Green Guide be provided to assessors?                 information, and is not specific to any one manufacturer. Specific manufacturers may obtain an Environmental Profile and            P        P        P         P        P        P
                                                                            Green Guide ratings from specific profiles and may include this on their marketing.
                                                                       Yes, the Green Guide ratings were generated based on a life cycle analysis. The building life is assumed to be 60 years.
        Does the Green Guide take into account the life of a building? Any repair, maintenance and replacement required over the 60 year life span has also been taken into account. The
Mat 1                                                                                                                                                                                                           P        P        P         P        P        P
                                                                       building is assumed to be dismantled or demolished at the end of its life.

        How are environmental ratings obtained for elements that are If the building element specifications are not included in the Green Guide, it is necessary to obtain a bespoke rating from
Mat 1   not in the Green Guide?                                                                                                                                                                                 P        P        P         P        P        P
                                                                     their Code service provider.
                                                                            The environmental ratings in the Green Guide are based on Life Cycle Assessment studies of environmental impacts.
                                                                            Materials and components are presented in their typical ‘As Built’ element form. They are compared on a like-for-like basis,
        What are the environmental ratings in the Green Guide to            for 1m2 of components that fulfil the same or very similar functions; variables such as the mass of a material required to
Mat 1   Specification based on?                                             fulfil a particular function are taken into account. This is because a direct comparison between the Environmental Profile of       P        P        P         P        P        P
                                                                            a tonne of steel and a tonne of structural concrete would be misleading, as less steel would be required to achieve the
                                                                            same structural performance.

        When assessing an existing building that is undergoing a
                                                                            If an elemental specification is re-used/retained, an A+ rating can be automatically awarded to the re-used component.
        Change of Use to become residential dwellings. Can the
Mat 1                                                                       Where only parts of the component are maintained and additional materials are to be introduced, a bespoke rating will be            P        P        P         P        P        P
        RETAINED roof, external walls, upper floors or ground floors
                                                                            required to determine the overall environmental impact.
        achieve A+ ratings?
                                                                            For in-situ concrete that is being mixed on site (the technical guidance currently only relates to ready mix):

                                                                            Key processes: cement production (not storage and mixing of mortar onsite as had been previously advised)
        At what stages do the Mat 2 Environmental Management
Mat 2   System (EMS) requirements apply to concrete mixed in-situ?                                                                                                                                              P        P        P         P        P        P
                                                                            Supply chain processes:
                                                                            a) extraction and production of the aggregate used for the concrete production
                                                                            b) extraction and production of the limestone used for the cement production


                                                                            The Environmental Profiles Methodology is a standardised method of identifying and assessing the environmental effects
                                                                            associated with building materials over their life cycle - that is their extraction, processing, use and maintenance, and their
                                                                            eventual disposal. It establishes a set of common rules and guidelines for applying Life Cycle Assessment (LCA) to UK
                                                                            construction products, to produce Environmental Profiles. In outcome Profiles provide a means for presenting "embodied"
        Can we use Environmental Profile certificates as evidence for       environmental data to cut through the confusion of claims and counterclaims about the performance of building materials.
Mat 2   compliance with Mat 2 and 3?                                                                                                                                                                            P        P        P         P        P        P
                                                                            Mat 2 and 3 deal with the responsible sourcing aspects of a particular material and therefore are linked to an Environmental
                                                                            Management System (EMS). An Environmental Profile might be an important component of an Environmental Management
                                                                            System (EMS) as it provides cradle to grave impacts information but does not demonstrate evidence of an Environmental
                                                                            Management System (EMS) and as such it is not suitable as evidence for Mat 2/3.



                                                                            This information can be found using the following organisations websites:-
        How can I verify whether or not a company has been issued
        with a certain type of timber certificate, find associated timber   •FSC (Forest Stewardship Council)
Mat 2   certificate numbers or check the validity of a particular           •PEFC (Programme of Endorsement of Forest Certification Schemes)                                                                    P        P        P         P        P        P
        certificate?                                                        •CSA (Canadian Standards Association)
                                                                            •SFI (Sustainable Forestry Initiative)


                                                                            The quantity surveyor, architects or developer for the particular development may be able to provide the percentages of
        How do I obtain information or data to calculate the % of the
                                                                            material to you. Otherwise, the assessor can calculate this based on the architectural drawings for the particular
Mat 2   material used?                                                                                                                                                                                          P        P        P         P        P        P
                                                                            development.

        I am unsure whether to enter an element into the Mat 2              If the element is present, it will need to be included. The minimum of 5 elements requirement is on the pretext that 5
Mat 2   calculator tool as not present or present but not assessed?         elements are necessary for a construction to be deemed a house.                                                                     P        P        P         P        P        P
                                                                     What is required for the responsible sourcing credits is an environmental management scheme certificate (e.g. ISO14001,
                                                                     EMAS). This demonstrates that the company operates an environmental management scheme for either the key process
                                                                     stage or key process and extraction stage.

                                                                     We would recommend you to go to the ISO website for guidance (http://www.iso.org/iso/about.htm) for further detailed
                                                                     information regarding ISO in general, ISO14001 and Environmental Management System (EMS)
                                                                     ((http://www.iso.org/iso/iso_14000_essentials). />
                                                                     ISO9001 is not applicable for these issues as it looks at quality management rather than environmental management. The
                                                                     differences between ISO 9000 and 14000 family are as follows (extracted from the ISO website):
                                                                     ISO 9000 family

                                                                     The ISO 9000 family addresses "Quality management".
                                                                     This means what the organization does to fulfil:
        Is ISO 9001 applicable to Mat 2 and 3?
Mat 2                                                                                                                                                                                                   P   P   P   P   P   P
                                                                     the customer's quality requirements, and
                                                                     applicable regulatory requirements, while aiming to
                                                                     enhance customer satisfaction, and
                                                                     achieve continual improvement of its performance in pursuit of these objectives.

                                                                     ISO 14000 family

                                                                     The ISO 14000 family addresses "Environmental management".
                                                                     This means what the organization does to:

                                                                     minimize harmful effects on the environment caused by its activities, and to
                                                                     achieve continual improvement of its environmental performance.


                                                                     Medium density fibreboard (MDF) - made from residues of log thinnings and sawmill chips - can be considered as "recycled
                                                                     material" provided that its Environmental Management System (EMS) certification can show that the material used comes
                                                                     from thinning of logs with diameter of less than 24cm. Sawmill chips will be automatically considered as "recycled material"
                                                                     (and will be in tier three provided an EMS for the key processes can be supplied).

        What Environmental Management System (EMS) requirements
Mat 2   apply to Medium density fibreboard (MDF)?                                                                                                                                                       P   P   P   P   P   P
                                                                     If the assessor is unsure of what type of timber the material is made from, then all of the EMS and Legally Sourced Timber
                                                                     requirements in the Mat 2 or 3 criteria apply, otherwise the material cannot be demonstrated as meeting requirements and
                                                                     credits should not be awarded.



                                                                     The Green Dragon certificate does not state which processes have been covered, unlike ISO14001 (which states within the
                                                                     certificate whether it covers both key processes and supply chain or just the key processes), as such it is difficult to
                                                                     ascertain which tier (3 or 4) the material in question would be allocated to. Therefore, providing the certificate confirms that
        What tier is the Green Dragon scheme allocated within?
Mat 2                                                                level 4 has been achieved, then it can be assumed that the key processes have been covered automatically putting it within         P   P   P   P   P   P
                                                                     tier 4. For it to be allocated to tier 3, the assessor would have to seek additional confirmation that the certificate covered
                                                                     the supply chain as well.


                                                                     No, for the purpose of assessing this credit, lift shaft walls would not be classed as internal walls as they carry out
Mat 3                                                                                                                                                                                                   P   P   P   P   P   P
        Are lift shaft walls considered as internal walls?           significantly different additional structural functions. Lift shaft walls should be ignored for the purpose of the assessment.

                                                                     For in-situ concrete that is being mixed on site (the technical guidance currently only relates to ready mix):

                                                                     Key processes: cement production (not storage and mixing of mortar onsite as had been previously advised)
        At what stages do the Mat 3 Environmental Management
Mat 3   System (EMS) requirements apply to concrete mixed in-situ?                                                                                                                                      P   P   P   P   P   P
                                                                     Supply chain processes:
                                                                     a) extraction and production of the aggregate used for the concrete production
                                                                     b) extraction and production of the limestone used for the cement production
                                                                            The Environmental Profiles Methodology is a standardised method of identifying and assessing the environmental effects
                                                                            associated with building materials over their life cycle - that is their extraction, processing, use and maintenance, and their
                                                                            eventual disposal. It establishes a set of common rules and guidelines for applying Life Cycle Assessment (LCA) to UK
                                                                            construction products, to produce Environmental Profiles. In outcome Profiles provide a means for presenting "embodied"
        Can we use Environmental Profile certificates as evidence for       environmental data to cut through the confusion of claims and counterclaims about the performance of building materials.
Mat 3   compliance with Mat 2 and 3?                                                                                                                                                                          P   P   P   P   P   P
                                                                            Mat 2 and 3 deal with the responsible sourcing aspects of a particular material and therefore are linked to an Environmental
                                                                            Management System (EMS). An Environmental Profile might be an important component of an EMS as it provides cradle to
                                                                            grave impacts information but does not demonstrate evidence of an Environmental Management System (EMS) and as
                                                                            such it is not suitable as evidence for Mat 2/3.


                                                                            This information can be found using the following organisations websites:-
        How can I verify whether or not a company has been issued
        with a certain type of timber certificate, find associated timber   •FSC (Forest Stewardship Council)
Mat 3   certificate numbers or check the validity of a particular           •PEFC (Programme of Endorsement of Forest Certification Schemes)                                                                  P   P   P   P   P   P
        certificate?                                                        •CSA (Canadian Standards Association)
                                                                            •SFI (Sustainable Forestry Initiative)

                                                                            The quantity surveyor, architects or developer for the particular development may be able to provide the percentages of
        How do I obtain information or data to calculate the % of the
                                                                            material to you. Otherwise, the assessor can calculate this based on the architectural drawings for the particular
Mat 3   material used?                                                                                                                                                                                        P   P   P   P   P   P
                                                                            development.

        I am unsure whether to enter an element into the Mat 3              If the element is present, it will need to be included. The minimum of 5 elements requirement is on the pretext that 5
Mat 3   calculator tool as not present or present but not assessed?         elements are necessary for a construction to be deemed a house.                                                                   P   P   P   P   P   P

                                                                            What is required for the responsible sourcing credits is an environmental management scheme certificate (e.g. ISO14001,
                                                                            EMAS). This demonstrates that the company operates an environmental management scheme for either the key process
                                                                            stage or key process and extraction stage.

                                                                            We would recommend you to go to the ISO website for guidance (http://www.iso.org/iso/about.htm) for further detailed
                                                                            information regarding ISO in general, ISO14001 and EMS ((http://www.iso.org/iso/iso_14000_essentials). />
                                                                            ISO9001 is not applicable for these issues as it looks at quality management rather than environmental management. The
                                                                            differences between ISO 9000 and 14000 family are as follows (extracted from the ISO website):
                                                                            ISO 9000 family

                                                                            The ISO 9000 family addresses "Quality management".
                                                                            This means what the organization does to fulfil:
        Is ISO 9001 applicable to Mat 2 and 3?
Mat 3                                                                                                                                                                                                         P   P   P   P   P   P
                                                                            the customer's quality requirements, and
                                                                            applicable regulatory requirements, while aiming to
                                                                            enhance customer satisfaction, and
                                                                            achieve continual improvement of its performance in pursuit of these objectives.

                                                                            ISO 14000 family

                                                                            The ISO 14000 family addresses "Environmental management".
                                                                            This means what the organization does to:

                                                                            minimize harmful effects on the environment caused by its activities, and to
                                                                            achieve continual improvement of its environmental performance.

                                                                            Medium Density Fibreboard (MDF) - made from residues of log thinnings and sawmill chips - can be considered as
                                                                            "recycled material" provided that its EMS certification can show that the material used comes from thinning of logs with
                                                                            diameter of less than 24cm. Sawmill chips will be automatically considered as "recycled material" (and will be in tier three
                                                                            provided an EMS for the key processes can be supplied).

        What Environmental Management System (EMS) requirements
Mat 3   apply to Medium Density Fibreboard (MDF)?                                                                                                                                                             P   P   P   P   P   P
                                                                            If the assessor is unsure of what type of timber the material is made from, then all of the EMS and Legally Sourced Timber
                                                                            requirements in the Mat 2 or 3 criteria apply, otherwise the material cannot be demonstrated as meeting requirements and
                                                                            credits should not be awarded.
                                                                 The Green Dragon certificate does not state which processes have been covered, unlike ISO14001 (which states within the
                                                                 certificate whether it covers both key processes and supply chain or just the key processes), as such it is difficult to
                                                                 ascertain which tier (3 or 4) the material in question would be allocated to. Therefore, providing the certificate confirms that
        What tier is the Green Dragon scheme allocated within?
Mat 3                                                            level 4 has been achieved, then it can be assumed that the key processes have been covered automatically putting it within         P   P   P   P   P   P
                                                                 tier 4. For it to be allocated to tier 3, the assessor would have to seek additional confirmation that the certificate covered
                                                                 the supply chain as well.
Issue                                FAQ                                                                                                Answer                                                                                          Version
                                                                                                                                                                                                                Apr-07   Oct-07   Apr-08    Oct-08   May-09   Nov-10
                                                                         No. Whilst water butts do help to attenuate runoff they do not meet the criteria. The occupants will not necessarily make use of
        Are water butts considered as Sustainable Drainage Systems       the water butts. The water butts could be full for long periods of time therefore causing them to have no impact on reducing the
Sur 1                                                                                                                                                                                                             P        P        P         P        P        P
        (SUDS) in the Code for Sustainable Homes?                        runoff from the site.

                                                                         Yes, Green roofs can be considered as a form of infiltration

                                                                         At present there is no guidance regarding the use of green roofs currently provided in the Code for Sustainable Homes technical
                                                                         guide. In the interim designers and assessors should adopt the following approach:


                                                                         1. Utilise the Construction Industry Research and Information Association (CIRIA) Report C644, in particular the design
                                                                         standards and considerations in chapter 10.


                                                                         2. Design and size any downstream conveyance systems on a conservative basis, as if the green roof was not reducing volumes
                                                                         and attenuating flows.


                                                                         3. Calculations:
        Can Green Roofs be considered a form of infiltration under the
Sur 1   code?                                                                                                                                                                                                     P        P        P         P        P
                                                                         a) For small scale installations (developments where individual roofs are 100 square metres or less and the substrate depth is at
                                                                         least 60mm) a simplified approach may be taken. The run-off rate reduction and volume reduction may be taken as 50% each,
                                                                         where the slope is less than 10 degrees and there is at least a 60mm substrate (Table 10.1 on page 83 of CIRIA Report C644
                                                                         'Building Greener').

                                                                         b) For large scale installations (where individual buildings have green roofs of more than 100 square metres) the designers
                                                                         should justify the rainfall run-off rate reduction and volume reduction figures.


                                                                         In terms of compliance with the mandatory elements of the Code, a green roof may be deemed to be ‘infiltration’. The use of
                                                                         green roofs as a form of infiltration does not alter the approach that should be taken to surface water runoff management in Sur
                                                                         1. Where there is an additional volume of runoff the priority will still be to reduce the additional volume as far as possible using
                                                                         infiltration and/or by making the water available for use in the dwelling. Where the green roof does not deal with all of the
                                                                         additional volume of runoff from the development, other methods of infiltration and making the water available for reuse in the
                                                                         dwelling will need to be considered.

                                                                         To meet the requirements of this issue in the past for some design stage design & build projects. In order to have a consistent
                                                                         approach for all types of projects we will now take the following position.

                                                                         We do not to accept commitment letters for design stage evidence for any type of project for the Sur 1 issue.

                                                                         The evidence provided must meet the requirements set down in the technical guidance and any technical guidance notes
                                                                         relating to the version of the Code being assessed.

                                                                         The reasons for taking this stance are as follows:
                                                                         Sur 1 is not only a mandatory requirement but also an issue that can be difficult to achieve for some sites. Failing to achieve this
Sur 1   Can letters of commitment be accepted for evidence in Sur 1?     will mean that no Code level performance will be awarded. Therefore we consider that adequate and detailed attention needs to            P        P        P         P        P        P
                                                                         be given to this issue at the beginning of the project and that it is important to ensure that compliance will be achieved by doing
                                                                         the required calculations and verifications at design stage. This means that the required evidence should be available when the
                                                                         project is submitted for certification at design stage.

                                                                         There is a significant risk that if full calculations have not been completed by design stage then assessors and developers may
                                                                         not be aware until post construction stage that the mandatory requirement has not be achieved, the result being that contractual
                                                                         requirements are not met or are only met at significant additional cost. This is supported by the experience we have gained in the
                                                                         past year from assessments where Sur 1 requirements have not been fully considered at an early stage.
                                                                       The Code does not to accept commitment letters for design stage evidence for any type of project for the Sur 1 issue. The
                                                                       evidence provided must meet the requirements set down in the technical guidance and any technical guidance notes relating to
                                                                       the version of the Code being assessed.


                                                                       The reasons for taking this stance are as follows:


                                                                       Sur 1 is not only a mandatory requirement but also an issue that can be difficult to achieve for some sites. Failing to achieve this
        Can letters of commitment be accepted for evidence in Sur 1?   will mean that no Code level performance will be awarded. Therefore we consider that adequate and detailed attention needs to
Sur 1                                                                                                                                                                                                                                P
                                                                       be given to this issue at the beginning of the project and that it is important to ensure that compliance will be achieved by doing
                                                                       the required calculations and verifications at design stage. This means that the required evidence should be available when the
                                                                       project is submitted for certification at design stage.


                                                                       There is a significant risk that if full calculations have not been completed by design stage then assessors and developers may
                                                                       not be aware until post construction stage that the mandatory requirement has not be achieved, the result being that contractual
                                                                       requirements are not met or are only met at significant additional cost. This is supported by the experience we have gained since
                                                                       the Code was introduced in April 2007, from assessments where Sur 1 requirements have not been fully considered at an early
                                                                       stage.


                                                                       The Code criteria do not set a design requirement for the sizing of soakaways. A 1 in 10 year event may be sufficient to meet the
                                                                       criteria, however there may be sites where designing the soakaways to a 1 in 100 year event is necessary, as referred to in the
                                                                       Construction Industry Research and Information Association (CIRIA) (SUDS) Manual C697.

                                                                       The time to emptying is not specified in Sur 1. Typically, drainage engineers would following BRE Digest 365 or CIRIA SUDS
        Can soakaways designed for a 10 year event comply with the     Manual C697 for design guidance which both state;
Sur 1   Code?                                                                                                                                                                                                    P   P   P   P   P   P
                                                                       'The soakaway should discharge from full to half-volume within 24 hours...'

                                                                       In terms of the Code, it must be demonstrated that the soakaways will prevent an increase in the peak rate of runoff post
                                                                       development (for the 1 and 100 year events, including an allowance for climate change). Also, there should be no additional
                                                                       volume of runoff for the developed site for the 100 year event of 6hr duration, including an allowance for climate change.


        Can the tradable credits be awarded where the required
                                                                       Yes, if the required attenuation levels have been achieved whilst ensuring that the post-development runoff rates are no greater
        attenuation levels (e.g. 50%) have been met whilst achieving
Sur 1                                                                  than pre-development, then the appropriate credits can be awarded.                                                                        P   P
        the mandatory element of Sur 1?

        Can the tradable credits be awarded where the required
                                                                       Yes, if the required attenuation levels (no discharge for up to 5mm rainfall depth) have been achieved whilst ensuring that the
        attenuation levels have been met whilst achieving the
Sur 1                                                                  post-development runoff rates are no greater than pre-development, then the appropriate credits can be awarded.                                   P   P   P   P
        mandatory element of Sur 1?

                                                                       No, it is not necessary to connect the rainwater harvesting system to all the dwellings on the site achieving a Code rating. It is
                                                                       acceptable to connect to only some of the dwellings. The sizing of the rainwater harvesting system and how many dwellings the
                                                                       system should be connected to can be determined using BS8515. Please note it is not a requirement to use BS8515 it is merely
        Does rainwater harvesting need to be connected to all of the   a recommendation.
Sur 1   assessed dwellings within a site?                                                                                                                                                                        P   P   P   P   P
                                                                       The volume reduction criteria is based on re-using of as much of the rainwater as possible, which means that it should supply as
                                                                       many dwellings as reasonable given the yield of rainwater available.


                                                                       Considering storm durations up to and including the 6 hour duration in order to identify the peak rate of runoff for that storm event
                                                                       will be sufficient. Storm durations of less than 6hrs for a particular event will often have a greater peak rate of runoff than the 6hr
                                                                       storm. It is the duration of storm event showing the 'worst case' peak rate of runoff that should be identified as the peak rate of
                                                                       runoff for that event.
                                                                       As a simple example, for the 1 in 100 year event your site could have peak run off rates as follows;

                                                                       Summer 120 minute storm - 4l/s
        For what storm duration should the peak rate of runoff         Winter 120 minute storm - 6l/s
Sur 1   calculations be carried out?                                   Summer 240 minute storm - 5l/s                                                                                                            P   P   P   P   P   P
                                                                       Winter 240 minute storm - 7l/s
                                                                       Summer 360 minute storm - 4l/s
                                                                       Winter 360 minute storm - 3l/s
                                                                       (calculations would typically also include the 15, 30 and 60 minute storm durations but they have not been shown here as this is
                                                                       a simplified example)

                                                                       Since 7l/s is the 'worst case' of those storm durations shown above, the peak rate of runoff for the 1 in 100 year would be stated
                                                                       as 7l/s.
                                                                             Surface Water Runoff is treated as a site wide issue within the Code for Sustainable Homes. Where a block of flats contain both
                                                                             Code assessed and non-Code assessed dwellings within a single building envelope which serves a communal surface water
                                                                             management or rainwater harvesting facility, the following rule should be applied. The full area of roof feeding into the communal
                                                                             system must be accounted for when assessing rainwater volumes and rates under Sur 1. Therefore if all surface water from the
        How do I deal with the Surface Water run-off calculations when       roof is being collected and dealt with using a central system, 100% of the roof area must be considered in the calculations
        only some of the flats within a building envelope are being          regardless of the number of Code dwellings being assessed within the block.
Sur 1                                                                                                                                                                                                                 P   P   P   P   P   P
        assessed?
                                                                             Where Code assessed dwellings are located in a clearly defined section of the building and serviced by a roof area that
                                                                             separately collects and manages runoff, only this section of the roof needs to be taken into account in the calculation. This
                                                                             approach is consistent with the principles followed for mixed sites containing Code assessed and non-Code assessed houses
                                                                             feeding into a common surface water management system.

                                                                             The Code defines a watercourse as “A term including rivers, streams, ditches, drains, cuts, culverts, dykes, sluices, sewers and
                                                                             passages through which water flows”. This is applicable to all versions of the Code. There are various other definitions used
        How does the Code define watercourses?
Sur 1                                                                        within the industry to describe a watercourse. Assessors should make sure the consultant/engineer is provided with the Code              P   P   P   P   P
                                                                             definitions.

                                                                             The Code defines a watercourse as “A term that includes rivers, streams, ditches, drains, cuts, culverts, dykes, sluices, sewers
        How does the Code define watercourses and sewers?
Sur 1                                                                        and passages through which water flows.” There are various other definitions used within the industry to describe a watercourse.                             P
                                                                             Assessors should make sure the consultant/engineer is provided with the Code definition.
        How should the phrase 'directly connected to existing
                                                                             It should be interpreted as individual dwellings being directly connected to the existing sewer without any significant shared
        infrastructure?' stated in the Special Case 1.1. b) (issued in the
                                                                             installation (this Special Case is predominantly only relevant for smaller sites). It does not cover instances where an entire site or
        Sur 1 Technical Guidance Note 001) be interpreted when
Sur 1                                                                        new shared system is being connected into the existing main sewer i.e. it’s the difference between a new network being created           P   P   P   P   P   P
        assessing whether a development can meet the mandatory
                                                                             or a simple connection from a dwelling into an existing manhole/sewer.
        element by default.

                                                                             Where non-domestic accommodation is located between or below the dwellings and the roof, the roof must be assessed as it is
        I am assessing a block with retail units on the ground floor.        protecting the dwellings below. Roof areas to parts of the building not containing dwellings can be omitted from the assessment.
Sur 1   What roof area should be considered for Sur 1?                       Roof areas should be taken on plan in accordance with BS EN 12056-3.                                                                     P   P   P   P   P   P



                                                                    On a site where Code dwellings are dispersed throughout the development between non-Code dwellings you have two options
                                                                    for the Flood Risk Assessment (FRA) /hydrological report. One is to carry out one Flood Risk Assessment (FRA) for the whole
        I am assessing a development containing a mixture of Code
                                                                    site, then making sure that the whole site meets the Sur 1 criteria. Alternatively, Flood Risk Assessments (FRAs) can be
        and non-Code assessed dwellings. How should the Sur 1 issue
Sur 1                                                               compiled for each individual dwelling or group of dwellings. The whole site approach means only one report is produced but                        P   P   P   P   P
        be approached?
                                                                    attenuation measures will be needed for the whole site. The individual Flood Risk Assessment (FRA) approach means that site
                                                                    wide attenuation measures would not be necessary but that several reports would need to be produced.


                                                                             For sites containing a mixture of retail/commercial areas and Code assessed dwellings there are two options for assessing Sur 1.
        I am assessing a mixed-use development where large areas of
                                                                             The first is to assess the whole site (including the areas serving non-domestic uses) under the Code criteria. The second is to
        hardstanding have been planned to serve retail units and other
                                                                             partition the site into domestic and non-domestic areas and provide separate reports for each domestic zone. Where areas are
Sur 1   non-domestic properties. Can these areas be omitted from Sur                                                                                                                                                  P   P   P   P   P   P
                                                                             shared between typologies (e.g. access routes that are not to be adopted), such land must be considered for domestic use and
        1 calculations?
                                                                             incorporated to Sur 1 calculations.


                                                                             According to Planning Policy Statement 25, unless the site is below 1 hectare and within Zone 1, there will be a need to produce
                                                                             a site-specific Flood Risk Assessment (FRA).


        I am assessing a site of less that 1 hectare in flood Zone 1 does
                                                                          The requirements in the Code Technical Guide are that a Flood Risk Assessment (FRA) is always provided, regardless of the
        my client still need to produce an Flood Risk Assessment
Sur 1                                                                     size of the site, however the level of detail that will need to be provided will vary.                                                              P   P   P   P
        (FRA)?


                                                                             For small, low density sites, the report submitted for Sur 1 needs only to consist of a brief report – it could be a single page,
                                                                             provided by the developer’s/contractor’s engineer, confirming that the relevant authorities have been contacted and there is a
                                                                             low risk of flooding from all sources (Environment Agency for rivers and sea, sewerage undertaker for public sewers etc.).
                                                                             The following statement has been issued by National HouseBuilding Council (NHBC):

                                                                             The National HouseBuilding Council (NHBC) do in principle accept the proposal for incorporating Rainwater Harvesting Systems,
        I have heard that National HouseBuilding Council (NHBC) will
                                                                             however, the requirements for designing an appropriate system for the site conditions and the requirements for NHBC Standards
        not offer warranty for rainwater harvesting systems. Is this a
                                                                             will still need to be satisfied.                                                                                                         P   P   P   P   P   P
Sur 1   suitable reason for not incorporating rainwater harvesting on
        site?
                                                                             These system should meet the BS 8515 and/or have an independent third party assessment (The BBA have provided
                                                                             certification for a number of systems). If either of these have been met then they are likely to satisfy meeting NHBC technical
                                                                             requirements. (Assuming there are no in service or other known issues that NHBC Standards & Technical feel may need to be
                                                                             addressed) and is suitable for the site conditions.
        If a site is not in a flood zone area, does this make the flooding   No, a FRA is always required as evidence of whether or not the development site lies within a low, moderate or significant flood
Sur 1   confirmation from a Flood risk assessment (FRA) redundant?           risk area. A FRA is therefore always a requirement for the mandatory criteria.                                                                   P   P   P   P
        If a site is not in a flood zone area, does this make the flooding
                                                                             No, a NAtional Flood Risk Assessment (NaFRA) map is always required as evidence of whether or not the development site lies
        confirmation from NAtional Flood Risk Assessment (NaFRA)
Sur 1                                                                        within a low, moderate or significant flood risk area. A NaFRA map is therefore always a requirement where credits are to be          P   P
        redundant?
                                                                             awarded.
        If having consulted the Environmental Agency (EA)/water
        company or Internal Drainage Board, the developer is told the        In some cases attenuation cannot be used for a number of reasons. We will accept no attenuation on such a site as long as
        site must not be attenuated as it could increase the risk of         written evidence from the statutory body is provided. This will allow the site to meet the mandatory requirements by default, but
Sur 1                                                                                                                                                                                                              P   P   P   P   P   P
        flooding elsewhere, can the mandatory requirements and               no tradable credits could be awarded under Sur 1.
        tradable credits be met by default?

                                                                      The site must discharge runoff directly into to the tidal estuary if it is to be awarded credits by default. Typically, this would mean
                                                                      that drainage pipes would only carry runoff from the site and that they would not need to cross privately owned land outside the
                                                                      boundary of the development before reaching the sea. Please provide a plan showing the site drainage design for further
        In what situation can assessors achieve the mandatory element
                                                                      assistance.                                                                                                                                  P   P   P   P   P   P
Sur 1   of SUR1 by default?
                                                                      In terms of evidence requirements, assessors should provide drawings to show that the runoff discharges directly into an estuary
                                                                      or the sea. Where it is required, please include a copy of the EA discharge consent. A flood risk assessment that covers the risk
                                                                      of flooding from all sources (as detailed in the technical guide) must also be supplied.
                                                                      When the engineer/consultant is producing the calculations for peak rate of run off and volume of run off, the allowance for
                                                                      climate change should be added to both the pre and post development runoff calculations. It is acceptable to add the climate
        Should the climate change allowance be added only to the post
                                                                      change allowance only to the post development calculation, however this is likely to make the criteria harder to achieve on the
        development runoff calculations, or should it be added to the
Sur 1                                                                 site.                                                                                                                                                P   P   P
        pre-development calculations as well?



        Should the climate change allowance be added only to the post
                                                                       When the engineer/consultant is producing the calculations for peak rate of run off and volume of run off, the allowance for
        development run-off calculations, or should it be added to the
Sur 1                                                                  climate change should be added to the post development calculations only.                                                                                       P
        pre-development calculations as well?


                                                                             Simply stating that the requirements of the statutory authorities have been met, although important, may not be adequate to
                                                                             demonstrate Code compliance. Other statutory requirements will typically come from the local planning authorities (possibly
                                                                             through 106 agreements), the Environment Agency, the sewerage undertaker, water companies and/or the Highways Agency.
        Statutory requirements have been met on site - are the
Sur 1   requirements of the Sur 1 Issue met automatically?                   Correspondence giving maximum discharge rates is not acceptable as evidence of this. If a statutory authority explicitly states       P   P   P   P   P   P
                                                                             that surface water run-off on a site must be managed in such a way that would prevent a site from meeting the requirements that
                                                                             are set in the Code, evidence from that statutory authority should be submitted to the Code Service Provider for further guidance.



                                                                             No, the sewerage undertaker has set a maximum permissible rate of runoff. Discharging at the maximum permissible rate will not
        The developer is told by the sewerage undertaker that a runoff
                                                                             meet the Code criteria. The surface water runoff should be managed in line with the Code criteria. The rate of runoff should not
        rate of X l/s is permitted into their network. The surface water
                                                                             exceed pre-development levels and annual volumes of runoff post development should be no greater than the previous
Sur 1   runoff has been attenuated to meet this rate. Does this satisfy                                                                                                                                            P
                                                                             conditions for the site.
        the mandatory Code criteria?


        The developer is told by the sewerage undertaker that a runoff       No, the sewerage undertaker has set a maximum permissible rate of runoff. Discharging at the maximum permissible rate will not
        rate of X l/s is permitted into their network. The surface water     meet the Code criteria. The surface water runoff should be managed in line with the Code criteria. The rate of runoff should not
        runoff has been attenuated to meet this rate. Does this satisfy      exceed pre-development levels and additional volume of runoff caused by the new development should be reduced to zero.                    P   P   P   P   P
        the mandatory Code criteria?


                                                                             1- if the highways agency/local authority is assuming responsibility for the drainage network that serves the road and this network
                                                                             bypasses the new development's network to connect directly to the local drainage network, then the water running off from the
                                                                             roads does not need to be considered for this assessment. Evidence will need to be provided to demonstrate if this is the case.

        The Highways agency is adopting a road which runs through the 2- if the highways agency/local authority is not assuming responsibility for the drainage network that serves the road then the
        development. Do I need to include the run-off from the road in water running off from the roads need to be considered for this assessment.
Sur 1                                                                                                                                                                                                              P   P   P   P   P   P
        my calculations?
                                                                       3- if the highways agency/local authority is assuming responsibility for the drainage network that serves the road and this network
                                                                       is connected directly to the development drainage network (before these are connected to the local drainage network), then the
                                                                       water run off from the roads need to be considered for this assessment.
                                                                              Where there is no change in the impermeable area draining to the watercourse (this includes sewers) or where the impermeable
                                                                              area draining to the watercourse has decreased post development, the peak rate of runoff and volume of runoff requirements will
                                                                              be met by default and runoff calculations will not need to be provided. Instead, drawings showing the impermeable areas of the
                                                                              site draining to a watercourse should be provided for the pre and post development scenarios. Figures must also be provided to
                                                                              show a comparison of the area of drained impermeable surfaces pre and post development.
        The impermeable area of my site is decreasing. Do I still need
Sur 1   to do the calculations?                                               You may come across a site where the impermeable area pre-development is greater than post development but where pre-                       P   P   P   P   P   P
                                                                              development only part (or none) of the site was connected to a watercourse. The developed site will typically connect the whole
                                                                              site to the watercourse, therefore an increase in the runoff that enters the watercourse post development would occur. In this
                                                                              scenario peak rate of runoff and volume calculations must be provided as the criteria are not met by default.

                                                                              Please note that for April 2008 versions of the Code and onwards, where there is no change or a decrease in the impermeable
                                                                              area post development as described in the first paragraph above, it will still be mandatory to provide the Flood Risk Assessment
                                                                              as evidence in an assessment.
                                                                              There is no specific methodology stated in the technical guide for Brownfield calculations. It is the responsibility of the
        The Technical Guide refers to Greenfield methodologies that
                                                                              hydrological consultant/engineer to identify the most appropriate methodology in line with best practice. The Construction
        should be used. What methodology should be used for
Sur 1                                                                         Industry Research and Information Association (CIRIA) SUstainable Drainage Systems (SUDS) Manual provides calculation                       P   P   P   P   P
        Brownfield sites?
                                                                              methodologies which may be useful.


                                                                              Yes, if evidence can be provided to demonstrate that the sewerage undertaker requires a flow rate of X l/s into their network in
        The sewerage undertaker is requiring a minimum flow rate from
                                                                              order to maintain network flows, then this approach will be acceptable. Evidence should be provided to show how the sewerage
        the site into their network of X l/s to maintain network flows. The
                                                                              undertaker's requirements have been met in terms of the specified rate of runoff.
Sur 1   pre-development peak rate of runoff was lower than this. Will it                                                                                                                                                  P   P   P   P   P   P
                                                                              Annual volumes of runoff from the site should still be dealt with in line with the criteria as far as possible whilst still achieving the
        be possible to discharge to the sewerage undertaker's required
                                                                              runoff rate targets set by the sewerage undertaker.
        rate and still meet the mandatory requirements?

                                                                              The peak rate of runoff should be no greater post development. Refer to Interim Code of Practice (ICoP) SUstainable Drainage
                                                                              Systems (SUDS) and Construction Industry Research and Information Association (CIRIA) C697 for additional clarification.

                                                                              There is arguably less guidance on this issue in the above documents on Brownfield/urban sites than for Greenfield sites, partly
                                                                              because the intention with SUDS is to get the developed site as close to Greenfield behaviour as possible.

                                                                       From Interim Code of Practice (ICoP) SUstainable Drainage Systems (SUDS) : In the case of Brownfield sites drainage
        The Sur 1 Issue seems to be a tough requirement for Greenfield proposals will be measured against the existing performance of the site (although it is preferable to provide runoff characteristics,
Sur 1   sites - Does it go beyond best practice?                       which are similar to Greenfield)                                                                                                                   P   P   P   P   P

                                                                              From C697: In the case of Brownfield sites, drainage discharges should preferably still aim to achieve Greenfield runoff
                                                                              characteristics, but minimum requirements are based on the existing drainage conditions and ensuring discharge rates are not
                                                                              increased.

                                                                              The Code therefore allows drainage designs to ensure the runoff is ‘no worse’ than before , but does not currently require the
                                                                              more stringent interpretation which would aim for close to Greenfield rates. In all cases therefore, the peak rate off runoff should
                                                                              be limited as a minimum to the pre-development site and not have additional flows added on.
        When applying the default case for discharging rainwater              The site must discharge runoff directly into the tidal estuary or the sea, if it is to be awarded credits by default. Typically, this
        directly into a tidal estuary or the sea, how should the word         would mean that drainage pipes would only carry runoff from the site and that they would not need to cross privately owned land
Sur 1                                                                                                                                                                                                                     P   P   P   P   P   P
        'directly' be interpreted?                                            outside the boundary of the development before reaching the sea.


                                                                              Annex B of PPS25 gives guidance on making an allowance for climate change, suggesting an allowance of between 10% and
        What % should be used to allow for climate change in Surface          30%. The Code criteria do not specify a particular percentage allowance to make in calculations since, as detailed in PPS25, the
Sur 1   Water Run-Off (SWRO) calculations?                                    appropriate percentage will vary regionally and with the design lifetime of developments. When a report is submitted for                            P   P   P   P
                                                                              certification checks will be made to make sure that an allowance of between 10% and 30% has been made in calculations.



                                                                              Where infiltration and re-use of rainwater in the dwelling have been fully investigated for the site but only some (or none) of the
                                                                              additional volume can be reduced, the residual additional volume may be discharged and should be managed according to the
                                                                              criteria set (top of page 146, October 2008). These are listed in order of priority. The first approach to take would be to reduce the
                                                                              peak discharge rate from the site to the pre-development site’s estimated mean annual flood flow rate (Qbar). If this is not
        What happens when rainwater harvesting and infiltration have          possible then it should be reduced to 2l/s/ha. If this is not possible, then it should be reduced to a minimum flow rate based on
        been implemented and not all additional volume can be                 good practice to prevent easy blockage. Finally, any rainwater that is discharged to the public sewer or adopted surface water
Sur 1                                                                                                                                                                                                                             P   P   P
        prevented from leaving site?                                          sewer should comply with the sewerage undertaker’s minimum flow rate requirements.

                                                                              Simply discharging the rainwater from a site to meet the sewerage undertaker’s maximum capacity requirements will not be
                                                                              adequate unless it can be shown in a report that the hierarchy of surface water management methods, as specified in the Code,
                                                                              have been fully investigated (e.g. infiltration not possible, re-use of water within the dwelling not possible etc.), and where options
                                                                              are eliminated, justifications are given.
                                                                         See the definition of SUstainable Drainage Systems (SUDS) model agreements' in the technical guide.
        What information should be included in the SUstainable           For guidance on model agreements for the maintenance and operation of sustainable water management systems please follow
Sur 1   Drainage Systems (SUDS) agreements?                              the link below:                                                                                                                                 P   P   P

                                                                         The SUstainable Drainage Systems (SUDS) Model Agreements can be found in the lower half of the web page.
                                                                         A tidal estuary is defined as a semi-enclosed coastal body of water which has a free connection with the open sea and within
                                                                         which seawater is measurably diluted with fresh water derived from land drainage.
        What is the definition of a tidal estuary?
Sur 1                                                                    Tidal rivers (i.e. where no measurable seawater content is present during normal tidal movements) cannot be included as part of         P   P   P   P   P   P
                                                                         the estuary



                                                                         We do not specify the calculation methodology to be used regarding the additional volume of runoff, other than it should be for
                                                                         the 1 in 100 year event of 6 hr duration including an allowance for climate change. It is the responsibility of your consultant to
        What methodologies can be used to calculate the additional
                                                                         identify the most appropriate method given the nature of the project. At QA, the reviewer will check that the assessor has
Sur 1   volume of run-off?                                                                                                                                                                                               P   P   P
                                                                         gathered and correctly assessed the required information, and that the calculations provided meet the performance requirements
                                                                         set out in the Technical Guide. They will not seek to verify the technical content of a consultant’s report.


                                                                         It is not possible to list allowable specific reasons for not using rainwater harvesting as reasons tend to be very site specific and
        What reasons can be accepted for ruling out rainwater            arise from a range of factors. Consultants/engineers should use their professional judgement to identify where rainwater
Sur 1   harvesting on a site?                                            harvesting tanks can be used and where they feel that installing the tanks is not technically feasible they should state their                  P   P   P   P
                                                                         reasoning in their report. As long as the report clearly demonstrates that the consultant/engineer has fully investigated the
                                                                         various options for use of rainwater harvesting and they can show that it is not technically feasible then this will be acceptable
                                                                         Pre-reviewing Sur 1 reports is not part of the service provided by the Code service provider. It is the role of the assessor to check
                                                                         the reports and only specific queries relating to the criteria in the Code technical guidance should be sent through to the
                                                                         technical team. When you submit queries to the Code service provider please make sure that you relate them to the criteria in
                                                                         the technical guide and highlight which areas specifically you are having difficulty with. Providing as much detail as you can will
                                                                         help us to answer your query.

                                                                         As a guide, for the mandatory section of Sur 1 you should be checking that;

                                                                         -pre and post development runoff rate calculations have been provided for the 1 in 1 year and 1 in 100 year event as a minimum,
                                                                         including an allowance for climate change, and if for a Greenfield site, calculated according to the specified methodology. If the
                                                                         post development runoff rate has increased the rate should be reduced to pre-development levels using options such as holding
        Will the Code Service Provider pre-review the Sur 1 drainage /   tanks, hydrobrakes, soakaways.
        flood risk / SUDs report(s) before submission of the Code        -additional volume calculations have been provided, including an allowance for climate change and calculated for the 100 year
Sur 1   assessment report and confirm that it meet the requirements of   event of 6 hour duration.                                                                                                               P   P   P   P   P
        Sur 1?                                                           -if there is additional volume caused by the new site, there is evidence (including calculations) to show that the volume has been
                                                                         reduced either by infiltration (soakaways, swales etc) and/or using a rainwater harvesting system
                                                                         -where some or all of the additional volume cannot be prevented from being discharged, that there is evidence in the report as to
                                                                         why it was not possible and that the alternative criteria have been followed; the peak discharge rate from the site has been
                                                                         reduced to e.g. 2l/s/ha, or as a very last resort, rainwater is being discharged to a public sewer according to the rate defined by
                                                                         the Sewerage undertaker.

                                                                         For the credits you need to check that:

                                                                         SUstainable Drainage Systems (SUDS) are being used
                                                                         SUstainable Drainage Systems (SUDS) will improve the quality of the rainwater discharge
                                                                         AND EITHER: There will be no discharge into watercourses for rainfall depths up to 5mm
                                                                         OR: Agreements are established for long term ownership, operation and maintenance
                                                                         The limiting discharge is defined as the pre-development flow rate equivalent to the 1-year peak flow rate, mean annual flood
        What is the definition of limiting discharge?                    flow rate (Qbar) or 2 l/s/ha, whichever is the highest flow rate.
Sur 1                                                                                                                                                                                                                                P


                                                                         The calculation of Brownfield run-off rates should be as follows:

                                                                         a) If the existing drainage is known then it should be modelled using best practice simulation modelling, to determine the 1 year
                                                                         and 100 year peak flow rates at discharge points (without allowing surcharge of the system above cover levels to drive greater
        What methodology should be used for Brownfield sites?
Sur 1                                                                    flow rates through the discharge points).                                                                                                                   P

                                                                         b) If the system is not known, then the Brownfield run-off should be calculated using the Greenfield run-off models described
                                                                         above but with a Soil Type 5.
                                                                       According to Planning Policy Statement 25, unless the site is below 1 hectare and within Zone 1, there will be a need to produce
                                                                       a site-specific FRA.

                                                                       The requirements in the Code Technical Guide are that a FRA is always provided, regardless of the size of the site, however the
        I am assessing a site of less that 1 hectare in Flood Zone 1
                                                                       level of detail that will need to be provided will vary.                                                                              P   P   P   P   P   P
Sur 2   does my client still need to produce an FRA?
                                                                       For small, low density sites, the report needs only to consist of a brief report – it could be a single page, provided by the
                                                                       developer’s/contractor’s engineer, confirming that the relevant authorities have been contacted and there is a low risk of flooding
                                                                       from all sources (Environment Agency for rivers and sea, sewerage undertaker for public sewers etc.).

                                                                       The Flood risk assessment (FRA) should cover the risk of flooding from all sources, this includes:-
                                                                       · Fluvial (Rivers)
                                                                       · Tidal
        The criteria asks for a Flood risk assessment (FRA) which
                                                                       · Groundwater: (most common in low-lying areas underlain by permeable rock (aquifers))
        shows the risk of flooding from 'all sources'. What types of
Sur 2                                                                  · Sewers: combined, foul or surface water sewers                                                                                              P   P   P   P
        flooding should this cover?
                                                                       · Surface water: sheet runoff from adjacent land (urban or rural)
                                                                       · Infrastructure failure: Canals, reservoirs, Industrial processes, burst water mains, blocked sewers or failed pumping stations
Issue                                 FAQ                                                                                              Answer                                                                                        Version
                                                                                                                                                                                                                 Apr-07 Oct-07 Apr-08 Oct-08 May-09 Nov-10

                                                                          Provided the compactor is sized in accordance with the greater of BS 5906:2006 or LA guidelines; a letter of confirmation
Was 1   Can compactors be used and the Was 1 mandatory element            from the LA or private service provider confirming collection is provided as evidence; and all other requirements of the                 P      P      P         P   P      P
        achieved?                                                         Issue are met (i.e. the Was 1 Checklist), compactors can be used in meeting the mandatory element of Was 1.

        Can refuse storage be located in dedicated waste storage
Was 1   rooms within a block of flats?                                    Yes, dedicated internal storage areas can be used to demonstrate compliance                                                              P      P      P         P   P      P

                                                                          To clarify the requirements of the Was 1 checklist, access routes should be 'direct' and free from obstructions and level
                                                                          thresholds. The term 'directly' should be interpreted in the following way:

                                                                          •An inclusive pathway that requires departure from the curtilage of the property (or is susceptible to future changes made
                                                                          to the road layout and pavement by the LA/HA), would not comply as 'direct'. For example if a middle terrace dwelling route
                                                                          included leaving through the front door, then leaving the curtilage of the dwelling and travelling around the back of other
                                                                          houses to get to the bin store, this would not be compliant.
        Can you clarify the definition of a "direct" access route as      •In the first instance, it would be encouraged that the inclusive pathway is no longer than (or be part of) the route provided
Was 1   quoted in the Was 1 Checklist.                                    for able-bodied persons                                                                                                                                P         P   P
                                                                          •However, where the inclusive pathway provided is longer (within reason) than that taken by an able bodied-person -
                                                                          provided the route is contained within the curtilage of the dwelling - it will still count as 'direct'. If a middle terrace dwelling
                                                                          route included leaving through the front door, leaving the curtilage of the dwellings and travelling around the back of other
                                                                          houses to get to the bin store, this would not be compliant.
                                                                          Definition of curtilage: Curtilage’ is defined as ‘a small court yard, garth or piece of ground attached to a dwelling/house
                                                                          and forming one enclosure with it, or so regarded by the law; the area attached to and containing a dwelling/house and its
                                                                          out-buildings.’

                                                                          It is not always necessary to provide a level threshold to the doors at the rear of the property, however the criteria above
        Checklist Was 1 in April 08 version of the CSH technical guide
                                                                          Checklist Was 1 in April 08 Technical guide has been superseded by Checklist Was 1 in Oct 08, the latest version is
        is confusing and difficult to apply, can I use the one in the Oct
Was 1                                                                     retrospectively applicable to April 08, which will facilitate its interpretation and application on site.                                              P         P
        08 technical guide ?

                                                                         In this case, as a minimum for the mandatory requirement it will be required that sufficient space to accommodate the
                                                                         volume as calculated in BS5906 is provided. However you will also need confirmation from the Local Authority of the
        I am assessing a development in a Local Authority with no limit number of bins that they collect per week is unlimited.
        to the amount of bins that will be collected, how do I calculate
Was 1                                                                                                                                                                                                              P      P      P         P   P      P
        the mandatory requirement?                                       If the Local Authority confirms that they do have a maximum number of bins that they collect, and if the volume of the
                                                                         maximum number of bins is greater than the volume calculated using BS5906, then the greater volume (Local Authority
                                                                         Maximum) is the volume that must be provided.

        If it is not possible to achieve the mandatory requirement in     If it is not possible to achieve the mandatory requirement in any way, then no Code level will be achieved. However, in this
Was 1   Was 1, what can be done?                                          case the client can choose to request a zero rated certificate.                                                                          P      P      P         P   P      P

        Is it possible to meet the mandatory requirement without          Yes, the mandatory requirement is independent to the credits awarded for recycling and it is therefore possible to meet the
Was 1   scoring any credits?                                              mandatory requirements without attempting to achieve the tradable credits.                                                               P      P      P         P   P      P

                                                                          No, this is applicable to external waste storage areas only, the Was 1 accessibility checklist is only applicable to waste
        Is the criteria in the Was 1 Accessibility to Disabled People
                                                                          storage areas and not to the internal layout of the dwelling.
Was 1   checklist, applicable to the internal layout of dwellings?                                                                                                                                                               P         P   P


        Is the Was 1 accessibility checklist only applicable to dwellings
                                                                          No, the accessibility checklist is applicable to all dwellings being assessed under the Code.
Was 1   that are designed to be occupied by disabled users?                                                                                                                                                                      P         P   P



                                                                          Internal bins should be a fixture of the dwelling rather than a fitting which can be easily extracted by moving tenants.
                                                                          Although not necessary as evidence, assessors should check whether one of the following criteria applies to the bins
                                                                          before awarding credits:
        What is meant by the clause "free-standing recycling bins
Was 1   placed directly on the floor do not comply"?                                                                                                                                                               P      P
                                                                          •The bins are screwed down and thus annexed to the building.
                                                                          •Removal of the bins would cause damage to the fabric of the property (screws being pulled out etc).
                                                                          •The bins have been included on any itinerary pertinent to the dwelling as a fixture.
                                                                          Internal bins should be a fixture of the dwelling rather than a fitting which can be easily extracted by moving tenants.
                                                                          Although not necessary as evidence, assessors should check whether one of the following criteria applies to the bins
                                                                          before awarding credits:

        What is meant by the clause "free-standing recycling bins         •The bins are screwed down and thus annexed to the building.
Was 1                                                                                                                                                                                                              P   P   P   P
        placed directly on the floor or in a cupboard do not comply"?     •Removal of the bins would cause damage to the fabric of the property (screws being pulled out etc).
                                                                          •The bins have been included on any itinerary pertinent to the dwelling as a fixture.



        When assessing a block of flats with stairs, is it required to
                                                                          No, in a block of flats the accessibility requirement applies from the entrance door of the block of flats up to and including
        provide a lift in order to guarantee that all dwellings have
Was 1                                                                     the waste storage space.                                                                                                         P   P   P   P   P   P
        accessibility to the storage space?

        Which of the space requirement volumes is required to comply The mandatory requirement is that enough external space has been provided, for both recyclable and non recyclable
        with the mandatory requirement for external storage do I need waste, for the largest of the following two volumes: a) volume for bins that are being provided by the Local Authority OR b)
Was 1                                                                                                                                                                                                      P   P   P   P   P   P
        to comply with (Local Authority bins or BS5906)?              volume as recommended by British Standard 5906 (British Standards, 2005)

        Would the accessibility requirements of Was 1 be met if,
        compliant accessibility is provided from the dwelling entrance
                                                                          No it is not acceptable, the user has to be able to access the space, go inside, deposit the waste, easily turn around and
        up to the entrance of the waste storage space, which allows                                                                                                                                        P   P   P   P   P   P
Was 1                                                                     then exit the storage space.
        the user to deposit the waste at the entrance of the waste
        storage space?

                                                                          a) Visual signs must be provided at the communal waste storage and composting facility giving instructions on how to use
                                                                          the facility (identifying different waste types, collection times etc). Signs must comprise simple words, clearly separated
                                                                          from one another, in short sentences. A sans serif typeface with an x height of at least 15mm to 25 mm (lower case letter
                                                                          height) to capital height must be used. Any symbols or pictograms used on visual signs must be at least 100 mm in overall
                                                                          height. Letters, symbols and pictograms must contrast visually with the signboard. Signboards must contrast visually with
                                                                          their backgrounds.
        What is suitable signage under Checklist Was 1 for a
Was 1   communal bin store?                                                                                                                                                                                        P   P   P
                                                                          b) Signs and information specified in accordance with section 9.2 of BS 8300:2009.

                                                                       c) Artificial lighting systems should be designed to maintain a level of illumination that is suitable for blind and partially
                                                                       sighted people and is compatible with electronic and radio frequency installations. Where artificial lighting is provided, it
                                                                       should use high frequency electronic ballasts to avoid any perception of flicker. Space lighting must meet the requirements
                                                                       of the Ene 6 Issue (capable of only accepting lamps having a luminous efficacy greater than 40 lumens per circuit Watt
                                                                       and controlled by push button time switches/PIR sensors or equivalent).
                                                                       The requirement in the technical guidance is that the bins are 'covered'. This can be either the lid supplied with the bins or
                                                                       if bins do not have lids then these bins will be required to be stored inside an enclosed space. The aim behind the
                                                                       requirement is to ensure refuse remains secure and protected from the elements until it is collected. If the lidded approach
        Within the definition of adequate external space, the guidance is taken the assessor should use their judgement to identify if the lids are fit for purpose. There are no specific
        suggests that the bins must be covered. Does this refer to the requirements within the technical guide that state what type of lid should be used. Wheelie bins and recycling collection
        covered storage space or would the wheelie bins with the lid   scheme boxes typically have suitable lids as part of their design.
Was 1                                                                                                                                                                                                              P   P   P
        (i.e. cover, as provided by the local authority) comply under  Please note also, that where only sacks are being provided by the local authority for recycling and/or general waste, best
        this credit?                                                   practice would be for the developer to provide a solid bin/box with a lid for storage of sacks between collections. However
                                                                       this is a recommendation only and is not a requirement of the Code. Where recycling sacks are provided, we will consider
                                                                       a tied recycling sack to be 'covered' as it fully encloses the contents.


                                                                          The mandatory element of Was 2 stems from the April 2008 Site Waste Management Plan (SWMP) regulations which
        It states in the Code technical guidance that the mandatory
                                                                          state that:-
        element of this issue can be awarded by default where the
Was 2   cost of construction is less then £300,000. How do you define                                                                                                                                              P   P   P
                                                                          The cost of construction can be defined as the price in the accepted tender or, if there is no tender, the cost of labour,
        the cost of construction?
                                                                          plant and materials excluding VAT.

        The contractor has hired a company to pick up the recyclable
        site waste. The volume of the mixed waste is recorded,
        however the waste company does not record the volume of
                                                                          For section 7 of the checklist we require evidence confirming and demonstrating how this will be met from the individual
        the separated waste types prior to recycling. As the waste will
                                                                          responsible for planning and preparing the Site Waste Management Plan (SWMP). The evidence should demonstrate that
        be recycled, it seems that the credits should be awarded.                                                                                                                                                  P   P   P
Was 2                                                                     site induction, information and training both for in-house and sub-contracted staff will be undertaken, guaranteeing that
        Please could you confirm how to complete the Site Waste
                                                                          everyone knows the requirements of the Site Waste Management Plan (SWMP) and what is expected of them.
        Management Plan (SWMP) ( item 7- checklist 2a) to ensure
        the mandatory and credit-scoring requirements are met, given
        that the volumes of the different waste types are not
        available?
                                                                            The “Sufficient documentary evidence” refers to a letter from the waste contractor confirming that segregation of materials
                                                                            is carried out and that materials are re-used/recycled as appropriate. As the waste contractor is unlikely to recycle all the
        The contractor has hired a company to pick up the recyclable
                                                                            waste within the mixed skip, you are also required to obtain a waste recycling and/or re-use rate from the waste contractor
        site waste, take it to a recycling facility where it is separated
                                                                            which should be stated in the letter. The recycling/re-use rate states what percentage of waste the waste contractor
Was 2   and recycled. Item 2 in Checklist 2c notes that it is acceptable                                                                                                                                            P   P   P
                                                                            recycles/re-uses from the total volume of waste that is received by the contractor. You will also be required to get a break
        to separate and process recyclable materials off site. It states
                                                                            down of what the waste contractor does with the identified waste types produced by the development.
        that "sufficient documentary evidence" must be produced.
        What is required and what is deemed to be "sufficient"?

        The contractor has hired a company to pick up the recyclable
        site waste, take it to a recycling facility where it is separated
        and recycled. The volume of the mixed waste is recorded,
                                                                            To ensure compliance with item 9 of checklist 2a (as the waste company does not record the volume of the separated
        however the waste company does not record the volume of
                                                                            waste types prior to recycling), the developer/contractor must appoint an individual to carry out a visual analysis of the
        the separated waste types prior to recycling. The Code
Was 2                                                                       mixed skip/container(s) at an appropriate frequency. The appointed person must determine and record what the different                  P   P   P
        requires the amount of waste per type produced to be
                                                                            waste types are and estimate the quantities of the different waste types within the mixed waste.
        measured and recorded. (Item 9 in Checklist Was 2a:
        Mandatory Requirements). How do I to meet the requirements
        in this case?

        When the developer and the constructor are the same
                                                                     In this case, for both Design stage and Post construction stage assessments, the developer can write a letter to the
        person/organisation, who and how should the evidence of cost
Was 2                                                                assessor confirming the cost of construction.                                                                                          P   P   P   P   P
        of construction be provided / confirmed?

        Checklist Was 1 in April 08 version of the Code technical
                                                                            Checklist Was 1 in April 08 Technical guide has been superseded by Checklist Was 1 in Oct 08, the latest version is
        guide is confusing and difficult to apply, can I use the one in
Was 3                                                                       retrospectively applicable to April 08, which will facilitate its interpretation and application on site.                               P   P   P
        the Oct 08 technical guide ?
Issue                                 FAQ                                                                                          Answer                                                                                     Version
                                                                                                                                                                                                          Apr-07 Oct-07 Apr-08 Oct-08 May-09 Nov-10
                                                                        The British Board of Agreement (BBA) certificates do not usually contain confirmation of the Global Warming Potential
        Can British Board of Agreement (BBA) certificates be used as    (GWP) or Ozone Depletion Potential (ODP) properties of the insulant/hot water system etc. being certified. However,
Pol 1                                                                                                                                                                                                       P      P      P         P   P      P
        evidence for the Global Warming Potential (GWP) levels?         where this is specifically covered, a credit can be awarded on this basis.


                                                                        No, it is not the case that all insulation materials currently on the market have a GWP of less than 5. It is also important to
                                                                        note that the compliance requirements apply to any blowing agents used in the manufacture of an insulant and any
        Do all insulation materials currently on the market have a
                                                                        blowing agent used to spray the insulation in place. It is for these reasons that we require manufacturer’s confirmation of
Pol 1   Global Warming Potential (GWP) of less than 5?                                                                                                                                                      P      P      P         P   P      P
                                                                        Global Warming Potential (GWP) levels. The manufacturing process of insulating materials changes regularly. Because of
                                                                        this, EcoHomes does not include a complete list of specific insulating materials that comply.


                                                                        No absolute or definitive Global Warming Potential (GWP) for pentane exists - however most experts believe it to be
        Do all isomers of Pentane really have a Global Warming
                                                                        somewhere between 0 and 11. For the purpose of the issue, pentane and its isomers (iso-pentane, cyclopentane and n-
Pol 1   Potential (GWP) of less than 5?                                                                                                                                                                     P      P      P         P   P      P
                                                                        pentane) are assumed to have a GWP of less than 5.

        Do products used to fill gaps i.e. between window frames and
                                                                        No, such materials do not need to be considered under Pol 1 as their purpose is to reduce drafts rather than provide
        the structure of a dwelling need to be considered when
Pol 1                                                                   insulation.                                                                                                                         P      P      P         P   P      P
        assessing Pol 1?

        Do sealants used for the purpose of air tightness - around wall
Pol 1   and floor junctions for instance, need to be considered?        Sealants such as spray foams or mastics, do not need to be included in calculations for Pol 1.                                      P      P      P         P   P      P

        Does insulation installed for the purpose of reducing sound     Yes, all insulation included in the specification of the building elements with the purpose of improving the building fabrics
Pol 1   transmission need to be assessed?                               thermal performance and sound insulation need to be assessed to achieve Pol 1 credits.                                              P      P      P         P   P      P

                                                                        Unfortunately this is not sufficient information to award the credit. You will still need to find out the Global Warming
        If a certain type of insulation is designated as
                                                                        Potential (GWP) of the insulation for its manufacture and installation. This is necessary as although the insulation is CFC
        chlorofluorocarbon (CFC) free is it 'deemed to satisfy' this
Pol 1                                                                   free it may not necessarily be free from other gasses which could potentially give it a Global Warming Potential (GWP)              P      P      P         P   P      P
        credit?
                                                                        greater than 5.

        Would written confirmation from the developer stating the
        outcome of a telephone conversation with the manufacturer       No, only direct written forms of confirmation are acceptable under the Code; written confirmation of a telephone
Pol 1   verifying the Global Warming Potential (GWP) levels of a        conversation is not acceptable.                                                                                                     P      P      P         P   P      P
        product be sufficient to achieve Pol 1 credits?

                                                                        Wood burning stoves are generally enclosed by front doors and draw combustion air from the room in with they are
                                                                        positioned (i.e. open flue). Some wood burning stoves however draw air for combustion from an external duct meaning that
                                                                        the combustion is independent of the air supply in the heated room (i.e. balanced flue).

                                                                        Open Flue

                                                                        The Code technical guidance states that ‘No credits can be awarded for open-flue heating’. This applies to all open-flue
                                                                        wood burning stoves, with the exception of those secondary heating systems that supply less than 8% of the total space
        Can credits be awarded for wood burning stoves with open
                                                                        and hot water demand as calculated in SAP. In this case such systems supplying less than 8% can be excluded from the                P      P      P         P   P      P
Pol 2   flues?
                                                                        NOx calculations.

                                                                        Balanced Flue

                                                                        Where a wood burning stove with a balanced flue is present in a dwelling, manufacturer’s stated NOx emission levels must
                                                                        be used; or where this cannot be obtained, default values can be used (see FAQ “What NOx emissions should be used for
                                                                        wood burning stoves and biomass boilers?”)


                                                                        Heating and hot water systems drawing combustion air via an open flue are not eligible for credits under the Pol 2 Issue.
                                                                        Where these are shown to provide more than 8% of the dwelling's combined heating and hot water demand in SAP, credits
                                                                        will not be achieved by the dwelling in the Pol 2 Issue, regardless of the emission rates and any other primary or secondary
        Can I award credits in the Pol 2 Issue where a heating or hot
                                                                        heating systems installed.
        water system with an open flue is designed/installed in the
Pol 2                                                                                                                                                                                                       P      P      P         P   P      P
        dwelling?
                                                                        Open flue heating and hot water systems may be disregarded in cases where they provide less than 8% of the dwellings
                                                                        combined heating and hot water demand. Credits may then be awarded based upon the performance of the primary
                                                                        heating and hot water systems.
                                                                             If the primary heat source is an open flue system then it cannot count towards credits under Pol 2. If there is a secondary
                                                                             heating or hot water source with an open flue, e.g. a fireplace, then this can be counted as long as appropriate NOx figures
                                                                             can be obtained to allow an average to be calculated.
        Can open flue heating systems still achieve the credits?
Pol 2                                                                                                                                                                                                          P   P   P   P   P   P
                                                                             Sealed systems generally have higher combustion efficiency and reduced risks of CO poisoning. Community open flue
                                                                             systems still have associated risks, e.g. a basement plant room leaking fumes into a nearby flat, and can therefore also not
                                                                             currently count towards Pol 2 credits.
        Can Pol 2 credits be awarded by default where annual hot             Yes, if the grid electricity used at peak times is offset by the export of electricity generated by zero emission sources back
        water and heating load is met by electrically powered systems        to the grid at times of low demand, three credits may be awarded. The capacity of the ZC electrical energy source to meet
Pol 2                                                                                                                                                                                                          P   P   P   P   P   P
        that do not produce NOx but where peak loads are                     annual loads must be demonstrated by SAP.
        supplemented by grid electricity?
                                                                             Wood burning stoves can be defined as simple appliances in which manually loaded fuels are combusted with the useful
                                                                             heat being transmitted to the surroundings by radiation and convection. The stoves which utilise solid fuels are generally
                                                                             used for space heating in addition to cooking and/or hot water preparation (bath stove/furnace), while liquid and gas stoves
                                                                             are generally used for heating only.

                                                                             Stoves vary widely due to fuels type, application, design and construction materials, but are generally enclosed by front
        Can wood burning stoves score credits in the Pol 2 Issue?
Pol 2                                                                        doors and draw combustion air from the room in which they are positioned (i.e. are open flue and will not be eligible for         P   P   P   P   P   P
                                                                             credits under the Pol 2 Issue).

                                                                             Where a wood burning stove with a balanced flue is sourced, manufacturer's information on the NOx emission rate of the
                                                                             product must be used for Pol 2 calculations. Where the NOx emission rate is not supplied by the manufacturer, assessors
                                                                             should use a default figure of 469mg/kWh (dry NOx @ 0% excess Oxygen) for wood burning stoves.


        I am assessing a development which has a district heating
                                                                          If, for example, 200 mg/kWh of NOx is produced by a district heating system then it will not matter how many dwellings it
        system. The nitrogen oxide (NOx) figure in mg/kWh
                                                                          serves, since for every kWh of energy used 200 mg of NOx is produced regardless of how many kWh's of energy are
Pol 2   (milligram/kilowatt/hour) for the boiler seems quite high. Should                                                                                                                                      P   P   P   P   P   P
                                                                          being used. This figure cannot be divided by the number of dwellings as it is not scalable.
        it be divided by the number of dwellings being served?


                                                                             It is not possible to convert kg per year to mg/kWh. To carry out the Pol 2 calculation it is necessary to obtain the quantity
Pol 2   If NOx emissions are stated in kg/year, are these figures            of NOx per unit of energy used from the manufacturer of the heating and hot water systems.                                        P   P   P   P   P   P
        sufficient to be assessed using the Code criteria?

        If NOx emissions are stated in mg/m3 or parts per million            Yes, this is acceptable, as are figures in mg/MJ. For the conversion details, please see Section A of the Calculation
Pol 2   (ppm), are these figures sufficient to be assessed using the         Procedures in the Technical Guidance.                                                                                             P   P   P   P   P   P
        Code criteria?


        Is it likely that a development utilising electric storage heaters   As electricity has at least 10 times the associated NOx emissions of a domestic gas fired boiler, a development utilising
Pol 2   will score well under Pol 2, NOx emissions?                          electric storage heaters is unlikely to score credits under Pol 2 NOx emissions where they are powered by mains electricity.      P   P   P   P   P   P


                                                                             This depends. Electricity is required to power the system and the NOx emissions figure associated with grid electricity is
        Is it still possible to achieve Pol 2 credits where a heat pump      1200mg/kWh (under the Code). Therefore, if the heat pump is the primary system and uses grid electricity (as opposed to
        (Air Source or Ground Source) will be used to supply space           on site renewable electricity which can be low or zero NOx), it is unlikely to achieve any credits under Pol 2. However, if the
Pol 2                                                                                                                                                                                                          P   P   P   P   P   P
        and water heating?                                                   heat pump is being used as an auxiliary system for space and/or water heating, there is a possibility that credits can be
                                                                             achieved. Credits are awarded as per the guidance section 'Special Cases'.

        Should air conditioning systems be accounted for when                Yes, if the cooling accounts for more than 8% of the total heating, cooling and hot water demand, then it should be taken
Pol 2   calculating NOx emissions?                                           into account.                                                                                                                     P   P   P   P   P   P

                                                                             NOx emissions from wood burning stoves and biomass boilers can vary widely due to a range of issues including fuel
                                                                             types, application, design and construction materials. In this respect, for assessing the NOx emissions associated with
                                                                             specific products, it is always best to base emissions figures on manufacturer’s data. However, we are aware that it is
        What NOx emissions should be used for wood burning stoves            sometimes difficult to obtain such information from manufacturers. In this case, it is possible to use the following default
Pol 2   and biomass boilers?                                                 values;                                                                                                                           P   P   P   P   P   P

                                                                             •Biomass boilers and stoves with nominal heat output <50kW – NOx emissions of 268 mg/kWh @ 0% excess O2
                                                                             •Biomass boilers with nominal heat output 50kW to 50MW– NOx emissions of 540 mg/kWh @ 0% excess O2

        Where all heating and hot water energy is provided by systems Where all heating and hot water energy is provided by systems which do not produce NOx, 3 credits can normally be
        which do not produce NOx, can Pol 2 credits be awarded by     awarded. Some renewable energy systems may use mains electricity for pumps, in this case the associated NOx
Pol 2                                                                                                                                                                                                          P   P   P   P   P   P
        default?                                                      emissions would have to be taken into account.
Issue                                    FAQ                                                                                                Answer                                                                                     Version
                                                                                                                                                                                                                   Apr-07 Oct-07 Apr-08 Oct-08 May-09 Nov-10
Hea 1   Are trees considered an obstruction?                                    Typically, trees should not be considered as an obstruction as in most cases, although having a slight impact upon
                                                                                transmittance, daylight will not be significantly impeded. The only exception is thick/dense coniferous trees and hedges
                                                                                such as lelandi.
                                                                                                                                                                                                                     P      P      P         P   P      P
                                                                                Please see BS8206-2:2008 or consult with a daylighting expert for more guidance.

Hea 1   Can Average Daylight Factors be averaged between homes to               It is not permitted to average results between dwellings for Hea1.
        improve the overall performance of the entire development in Hea 1?
                                                                                                                                                                                                                     P      P      P         P   P      P


Hea 1   Can Code assessors can carry out daylight calculations?                 Although we recommended that developers seek out an expert to perform daylighting calculations, assessors are not
                                                                                required nor prohibited from performing calculations
                                                                                themselves. Any calculations provided by the assessor should have been signed off by the design team before submission               P      P      P         P   P      P
                                                                                as evidence.

Hea 1   Can computer simulation software be used to generate more accurate Yes, it is fine to use computer simulation software to generate more accurate R values, providing that the software is
        R values?                                                          adequate and its results cover the normal requirements for average daylight calculations.                                                 P      P      P         P   P      P

Hea 1   Can correction of 'frame' factors be applied to aperture areas?         Correction factors may be applied to aperture area in place of measuring the actual glazed area. These must be taken from
                                                                                Table A.6. in BS8206-2:2008.                                                                                                         P      P      P         P   P      P

Hea 1   Can glazed areas of doors (whether partially or fully glazed) be        Yes, doors that are fully or partially glazed can be included in the daylighting calculations. However, any difference in
        included in the daylighting calculations?                               opacity should be taken into account and included as a correction factor.                                                            P      P      P         P   P      P

Hea 1   Can I accept Average Daylight Factor calculations that do not use the   Where the daylighting expert considers them to be a more accurate representation of what has been designed for the
        default figures set out in the Technical Guidance but instead use       dwelling, it is acceptable to use values within Chartered Institution of Building Services Engineers (CIBSE) Lighting Guide
        those from Chartered Institution of Building Services Engineers         (LG) 10 as a replacement to default figures in Average Daylight Factor (ADF) calculations (these are set out in the Tech
                                                                                                                                                                                                                     P      P      P         P   P      P
        (CIBSE) Lighting Guide 10?                                              Guide). Assessors should refer to the CIBSE Lighting Guide in the evidence details of the online report where this is the
                                                                                case - although there will be no requirement to actually provide this during a full QA audit.

Hea 1   Can I award credits where the room designated as a Home Office          Where a credit in the Ene 9 Issue is sought, the room designated as the Home Office will need to have an Average
        does not have an Average Daylight Factor (ADF) of 1.5%?                 Daylight Factor (ADF) of at least 1.5% if the second credit in Hea 1 is to be awarded. Credits for Hea 1 can still be awarded
                                                                                                                                                                                                                     P      P      P         P   P      P
                                                                                where a Home Office space is not provided.

Hea 1   Can rooflights be considered in Average Daylight Factor (ADF)           Yes - all areas of exterior facing glazing can be considered in Average Daylight Factor (ADF) calculations. Where different
        Calculations?                                                           types of fenestration have been specified (e.g. a vertical windows and rooflights) the following guidance from BS8206-2008
                                                                                applies when calculating the Average Daylight Factor (ADF) for the room:
                                                                                "When two or more windows in a room face different obstructions, or differ in transmittance, the average daylight factor
                                                                                should be found separately for each window, and the results summed."
                                                                                                                                                                                                                     P      P      P         P   P      P
                                                                                 i.e. calculate the ADF for the room if just the vertical windows were installed, then add the Average Daylight Factor (ADF)
                                                                                generated if just the rooflights were installed.




Hea 1   Can rooflights be considered in No-sky Line calculations?               Clear roof light or velux windows can be considered for the view of sky credit. However sunpipes or diffusing element
                                                                                windows (e.g. frosted windows) cannot be considered. If the velux is in a ground floor extension or if it has a complicated
                                                                                design (e.g. skirting around the rooflight or if it's located in a aperture and the height of it has to be considered) we advise
                                                                                that you seek help from a daylighting specialist. Conventional rooflights at the same level of the ceiling, with no design           P      P      P         P   P      P
                                                                                complications, can be included in calculations using the procedure set out in the Technical Guidance.


Hea 1   Do rooms used as a home office (under Ene 9) need to comply with        Yes, for the purpose of the Hea 1 credit, a homes office is considered as a study and must comply in order for the credit to
        the lighting requirement?                                               be awarded. This is the case whatever room the home office is allocated to i.e. bedroom, living rooms etc.                           P      P      P         P   P      P

Hea 1   Does the kitchen sink have to be facing a window to enable the user     No, the view of the sky is only necessary from all worktops and tables in the kitchen. Therefore, although it may be
        to have a view of the sky?                                              preferable for the occupant, it is not a requirement to have the sink facing a window.                                               P      P      P         P   P      P

Hea 1   How should trees be considered when calculating the average             Trees can be ignored and should not be considered as an obstruction as in most cases, the sky can be seen through trees
        Daylight Factor?                                                        so therefore daylighting will pass through. They will have a slight negative impact on daylighting but it isn’t considered
                                                                                necessary to measure this impact for this credit. The only exception is thick/dense coniferous trees and hedges such as              P      P      P         P   P      P
                                                                                lelandi.
Hea 1   I am performing Average Daylight Factor (ADF) calculations on a           Where windows are separated from external areas by other glazing panels/translucent cladding, visual transmittances of
        room with a window opening onto a conservatory. How do I calculate        both layers must be multiplied together and this factor used in the Average Daylight Factor (ADF) calculations.
                                                                                                                                                                                                                    P         P     P   P   P   P
        the transmission factor?

Hea 1   I am performing Average Daylight Factor (ADF) calculations on a           In regards to calculating the Average Daylight Factor (ADF) when two different types of windows have been specified,
        room with two windows with different transmittance values. How do I       guidance from BS8206-2008 should be followed (this can borrowed from most public libraries):
        calculate the overall ADF for the room?                                   "When two or more windows in a room face different obstructions, or differ in transmittance, the average daylight factor
                                                                                  should be found separately for each window, and the results summed."
                                                                                                                                                                                                                    P         P     P   P   P   P
                                                                                  i.e. calculate the ADF for the room with just one window installed then add this to the Average Daylight Factor (ADF) if just
                                                                                  the other was installed.


Hea 1   I'm having trouble calculating the angle of visible sky - can you help?   Some Code Service Providers may provide a Hea 1 daylighting calculator tool that can aid assessors in performing this
                                                                                  calculation. This is intended as a checking tool - it is not a requirement to submit this calculator as evidence. Please seek
                                                                                  advice from a suitably qualified expert where further guidance on how to complete angle of visible sky calculation is needed.     P         P     P   P   P   P


Hea 1   In average daylight factor calculations is the value 'W' taken as the     No, 'W' relates to the glazed area of the window only. The area taken up by the frame and/or glazing bars should not be included in this value.
        entire aperture area?                                                                                                                                                                                      P           P    P   P   P   P

Hea 1   In order to demonstrate compliance, does the daylighting expert need The technical guide (p206), “calculation procedures”, point 3 states that there is the possibility to carry out calculations only
        to provide daylighting calculations for every room in every dwelling on for selected dwellings: “It is acceptable that daylighting calculations are carried out in selected dwellings when the
        site?                                                                   reasoning behind selection of dwellings (or rooms) clearly demonstrates that the rooms in the dwellings for which the
                                                                                calculations are not provided will perform better than those backed up by the calculations”. Hea 1 requires assessors to
                                                                                carry out a reasonableness check on average daylight factor and no-sky line calculations provided by the developer.
                                                                                Calculations should be supplied by the developer for either;
                                                                                A) all dwellings
                                                                                or
                                                                                B) those dwellings that are at the limits of compliance (as identified by the lighting consultant)
                                                                                Scenario A: All dwellings
                                                                                When daylighting calculations are provided for all dwellings, checks should be performed on;
                                                                                – one room per dwelling
                                                                                – in 10% of dwellings
                                                                                                                                                                                                                    P         P     P   P   P   P
                                                                                – up to a maximum of 10 dwellings per development
                                                                                When selecting the calculations for at least 10% of all of the dwellings on site:
                                                                                1. Ensure dwellings have different orientations
                                                                                2. Randomly select one room from each dwelling
                                                                                3. Check the calculation inputs for both the Average Daylight Factor calculation and the No Sky Line calculation
                                                                                4. If the input details are consistent with drawings / specs / other information you may award credits accordingly
                                                                                Scenario B: Limits of Compliance
                                                                                For each credit requirement, calculations should be provided for the lowest performing compliant room (the selection of
                                                                                which is made, and justified by the daylighting expert. This is on a site-wide basis. Credits can then be awarded to dwellings
                                                                                with rooms shown to perform beyond this limit of compliance (again this is to be justified by a daylighting consultant).
                                                                                Under this scenario, checks should be performed on all calculations provided for rooms at the limits of compliance.


Hea 1   In the online reporting tool, how do I award credits to homes with        For Hea 1, we would recommend only creating a Spec ID for the lowest performing compliant dwelling (the selection of
        rooms that have an Average Daylight Factor (ADF) and view of sky          which is made, and justified by the daylighting expert) on a project-wide basis. This Spec ID can then be attributed to all
        claimed to perform above the limits of compliance? The daylighting        dwellings the daylighting expert has shown have better levels of Average Daylight Factor (ADF) and View of the Sky (VOS).
        consultant has only provided calculations for those rooms shown to        A range of Spec IDs may be necessary for example where 10 flats achieve only 1 credit for the view of sky credit, 5 flats
        have the lowest compliant Average Daylight Factor (ADF) or View of        achieve 2 credits for Average Daylight Factor (ADF) for living rooms dining rooms and studies as well as the view of sky, 3
        the Sky (VOS) throughout the development.                                 flats achieve all three credits and 12 flats achieve 0 credits.
                                                                                                                                                                                                                    P         P     P   P   P   P
                                                                                  Where calculations sufficient to perform a reasonableness check are provided for the lowest performing rooms in dwellings
                                                                                  on site, assessors can avoid completing all fields in the Spec ID tab. Please simply fill out enough information to allow for
                                                                                  the award of the correct number of corrects whilst obviously assigning evidence and naming the Spec ID in the normal way.



Hea 1   To what decimal place are Average Daylight Factor measurements            Average Daylight Factor measurements should be rounded to 1 decimal place, e.g. an ADF of 1.49 would become 1.5.
        rounded to?                                                                                                                                                                                                 P         P     P   P   P   P
Hea 1   What should be considered as an obstruction when calculating the no- It is worth reiterating that the Code does not expect Code Assessors to be competent daylighting consultants. Where
        sky line?                                                            Assessors choose to complete calculations they should refer to BS8206-2:2008 or existing expert for more guidance. The
                                                                             technical query service is provided for assessors struggling to complete a reasonableness check - not the calculations
                                                                             themselves.

                                                                                 BS8206-2:2008 defines an obstruction as “anything outside a building which prevents a direct view of the sky from a given           P   P   P   P   P   P
                                                                                 reference point”. Daylighting experts should be consulted when in doubt of what should and should not be considered an
                                                                                 obstruction.



Hea 1   When completing daylighting calculations, is the default input value of All default values supplied for Hea 1 calculations are in most cases, a conservative estimate of the actual conditions. In the
        Ø 65° for angle of visible sky applicable where it is obviously lower?  unusual circumstance of Ø being less than 65°, a need to balance workload and accuracy means default values may still be
                                                                                                                                                                                                                     P   P   P   P   P   P
                                                                                applied.

Hea 1   Where reflectance values have been provided by the manufacturer,         Yes, reflectance values provided by the manufacturer can be used instead of the default values provided in the Technical
        can these be used instead of those specified in the Technical            Guidance. Using these figures will allow for more accurate daylight calculations, and may enable the dwelling to achieve
                                                                                                                                                                                                                     P   P   P   P   P   P
        Guidance?                                                                more credits.

Hea 1   Where rooms are open plan (i.e. a kitchen and dining room), how is       For open plan rooms, you will need to calculate the daylight factor for the entire space making up the different use areas.
        the average daylight factor calculated?                                  The overall average daylight factor will then need to be compared to the assessment criteria, and credits awarded
                                                                                 accordingly.

                                                                                 For example;
                                                                                                                                                                                                                     P   P   P   P   P   P
                                                                                 Where the calculated average daylight factor for the dining room and kitchen = 1.75%.

                                                                                 Kitchen daylight factor credit (2% required) = NOT achieved
                                                                                 Dining room daylight factor credit (1.5% required) = achieved


Hea 1   Where rooms are open plan (i.e. a kitchen, living room and dining        In cases of open plan kitchen, living and dining rooms, the average daylight factor must be calculated for the whole room.
        room), how is the average daylight factor calculated?                    The overall average daylight factor will then need to be assessed against the criteria, and credits awarded accordingly.

                                                                                 For example;

                                                                                 Where the calculated average daylight factor for the combined dining room, living room and kitchen = 1.75%.
                                                                                                                                                                                                                     P   P   P   P   P   P
                                                                                 Kitchen daylight factor credit (2% required) = NOT achieved
                                                                                 Dining room and living room daylight factor credit (1.5% required) = achieved




Hea 1   Within a development with no significant obstructions surrounding the
        site how is the no-sky line calculated?                               If there are no obstructions preventing light entering the room or if the obstructions are below the window (therefore still not
                                                                              affecting the distribution of light into the room) the value 'd' will be greater than the room depth in most instances. Under this
                                                                              scenario please simply state in the report that 'd' is greater than the room depth due to the absence of any obstructions and          P   P   P   P   P   P
                                                                              award the credit by default.


Hea 2   Are sound tests completed by an ANC (Association of Noise                Please see the definitions section of the Code Technical Guide that states any organisations or individuals registered with
        Consultants) registered organisation or individual acceptable under      the Association of Noise Consultants (ANC) Registration Scheme may be considered as a 'compliant test body'.
        Hea 2?
                                                                                 Please note that if sound insulation testing was completed by an ANC organization/consultant before the ANC became a                P   P   P   P   P   P
                                                                                 UKAS accredited body, additional requirements will apply. Information regarding the additional requirements can be found in
                                                                                 the December 2006 process note.

Hea 2   Can a dwelling score 4 credits whilst using Robust Details?              At the time of writing, the use of Robust details will allow for a maximum of 3 credits to be achieved under Hea 2. In the
                                                                                 future it is likely that wall and floors specifications that meet the insulation values required to award 4 credits in this Issue
                                                                                                                                                                                                                     P   P   P   P   P   P
                                                                                 (i.e. 8dB higher/lower than Part E provisions) will be accredited by RDL.

Hea 2   Can dwelling-houses attached only by garages be awarded 4 credits        Garages are defined as non-habitable rooms and as such, properties with adjoining garages can only achieve three credits
        by default?                                                              to allow for the small amount of sound nuisance that can occur in such cases.                                                       P   P   P   P   P   P
Hea 2   Does sound testing have to be completed for internal                    The Codes performance requirements only apply to party walls and floors separating adjoining dwelling-houses or flats.
        partitions/separating floors?                                           They do not apply to internal partitions or separating floors (although protection against sound within a dwelling is covered
                                                                                by Part E). Detached dwellings can be awarded four credits by default. For attached dwellings where party walls/floors
                                                                                                                                                                                                                   P   P   P   P   P   P
                                                                                separate only non habitable rooms, 3 credits can be awarded by default. This is explained within the 'Special Cases' section
                                                                                of Hea 2.

Hea 2   How do the performance requirements relate to floor and walls           The current special case in the Technical Guide states that testing is only required between habitable rooms and that where
        separating dwellings from non-domestic property?                        there are no habitable rooms, credits can be awarded by default. However, this assumes an entirely residential
                                                                                development.

                                                                                Part E states that "a higher standard sound insulation may be required between spaces used for normal domestic purposes
                                                                                and communal or non-domestic purposes. In these situations the appropriate level of sound insulation will depend on the
                                                                                noise generated in the communal or non-domestic space. Specialist advice may be needed to establish if a higher standard
                                                                                of sound insulation is required and, if so, to determine the appropriate level.”
                                                                                                                                                                                                                   P   P   P   P   P   P
                                                                                Therefore, where habitable rooms of a dwelling border rooms contained in a non-domestic property , advice should be
                                                                                sought from an appropriate party (this could be an acoustic consultant but it is most likely to be Building Control) regarding
                                                                                the appropriate level of sound insulation and testing required to meet the regulatory minimum. Once the baseline has been
                                                                                established, Code credits can be awarded based on the criteria and requirements stated in the Technical Guide.




Hea 2   How do the requirements of Hea 2 apply to new dwellings built against Any sound testing necessary to be conducted between new and occupied dwellings is a matter for local negotiation. Please
        existing properties?                                                  consult with Building Control to determine the basic minimum standards required by Part E. The targets of the Hea 2 Issue
                                                                                                                                                                                                                   P   P   P   P   P   P
                                                                              can then be applied and credits awarded where these are achieved.

Hea 2   How many credits can be awarded where Robust Details (RDs) and          RDs and PCT can be used in the same building. The number of credits awarded should be based on the lower
        on-site pre-completion testing (PCT) have been used for different       performance. For example, if the floor is subject to PCT and qualifies for 2 credits and the wall is in the RD scheme and
                                                                                                                                                                                                                   P   P   P   P   P   P
        components of the dwelling?                                             qualifies for 3 credits, only 2 credits would be awarded.

Hea 2   How should a Habitable Room be defined?                                 For the purpose of this issue, habitable rooms include any room where individuals will sit or lie down and require a
                                                                                reasonably quiet environment to concentrate or rest. Such rooms are bedrooms, living rooms, dining rooms, studies as well
                                                                                                                                                                                                                                       P
                                                                                as kitchen-dining and kitchen-living rooms.

Hea 2   How should a Non-Habitable Room be defined?                             For the purpose of this issue, non-habitable rooms include any room that is not considered a habitable room as defined
                                                                                above, such as kitchens, bathrooms, toilets, hallways, garages and laundry rooms.                                                                      P

Hea 2   If building control advise you to carry out an alternative number of       The programme of pre-completion testing to be carried out for a development should always be carried out in line with the
        sound tests for example 1 in 30 dwellings, will this still comply with the requirements set out by Building Regulations. The Code does not require more onerous testing regimes than that specified
        requirements of Hea 2?                                                     by Building Control. Hea 2 targets are bolted on to the requirements of Part E.
                                                                                                                                                                                                                   P   P   P   P   P   P
                                                                                Therefore, where Building Regulations state that a reduced number of tests are required due to the size of the
                                                                                development, this will be deemed compliant under the Code

Hea 2   The Design Stage requirement to provide evidence of the "potential     For Design Stage assessment reports, the Code requires “brief details of separating walls/floors and flanking constructions,
        for the constructions to meet the relevant performance standards" is a with evidence of the potential for the constructions to meet the relevant performance standards, e.g. design statement from
        costly burden for contractors - can it be avoided?                     an acoustic consultant with appropriate expertise in building acoustics, or reference to text in the specification describing
                                                                               these requirements.”

                                                                                Although it must be satisfied in some form, this evidence requirement is not prescriptive. The issue uses a 'design
                                                                                statement from an acoustic consultant...' as an example of what would be acceptable. Another acceptable options would              P   P   P   P   P   P
                                                                                be, a test report completed on a wall/floor with a specification exactly corresponding to that of the wall/floor currently under
                                                                                assessment. The requirement can also be satisfied where an Architectural Technician can produce evidence of the
                                                                                potential construction meeting the relevant performance standards.



Hea 2   The performance of the Robust Details selected for the dwelling has     Assessors should be aware that the credits awarded for robust details may change at any stage due to the continuing
        been altered on the Robust Details website so that the number of        testing undertaken on them by Robust Details Ltd (RDL). The RDL website maintains an historical record of changes to
        credits achievable has dropped.                                         enable assessors to track the number of credits available for a Robust Detail (RD) at any time.

                                                                                Where a site has been registered with the RDL before a credit award is reduced, credits can be claimed against the award           P   P   P   P   P   P
                                                                                structure current at the point of receiving the RDL unique reference number for the site. Credits awarded at design stage
                                                                                will also be awarded at post construction stage (provided the development meets the RD requirements) even if the credits
                                                                                awarded for the RD in question have changed in the interim.
Hea 2   What classification of ANC (Association of Noise Consultants)          Organisations or individuals must be registered to conduct pre-completion testing by the ANC. Basic members are not
        membership is required to conduct pre-completion testing?              classed as appropriately qualified.                                                                                                P   P   P   P   P   P

Hea 2   What programme of on-site pre-completion testing must be conducted The programme of pre-completion testing must be based on the 'normal programme of testing' described in Approved
        to comply with Hea 2?                                              Document E. The Code simply requires that the Building Regulations methodology to be followed. Pre-completion testing is
                                                                                                                                                                                                                  P   P   P   P   P   P
                                                                           described in Section 1 (pg16) of Part E.

Hea 2   When completing on-site pre-completion testing, do all dwellings need When performing sound testing it is acceptable to demonstrate compliance for clusters of dwellings separated into groups
        to be tested?                                                         or sub-groups as defined under Part E.

                                                                               The dwellings in a group or sub-group that have been tested are awarded credits appropriate to their measured
                                                                                                                                                                                                                  P   P   P   P   P   P
                                                                               performance. Other dwellings in the group or sub-group that were not tested are awarded the same number of credits as
                                                                               the lowest performing separating walls or floors in the same group or sub-group that was tested. The performance of the
                                                                               lowest performing separating wall or floor must be clearly identified by the Compliant Test Body.

Hea 2   When completing on-site pre-completion testing, how are credits        Credits may not be awarded if tests do not show sound insulation values to be at or above the levels set for the award of
        awarded if test units fail to meet the targets of the Issue?           credits in this Issue. If credits remain sought after, remedial treatment should be applied to failed rooms that must then be
                                                                               retested to demonstrate enhanced insulation and compliance. Under this circumstance, the developer should demonstrate
                                                                               to the testing body's satisfaction that non-tested rooms and properties within the test group or sub group will also meet the      P   P   P   P   P   P
                                                                               performance standards. Normally this can be done by completing additional testing, and/or applying remedial treatment
                                                                               and/or demonstrating that the cause of failure does not occur in those properties/rooms.

Hea 2   When using Robust Details and on-site sound testing, what happens if This is unlikely to occur. However, where both Robust Details and sound testing are employed for a dwelling, it is up to the
        sound testing shows walls and floor to provide less sound insulation Assessor's discretion to decide upon which performance measurements are used to demonstrate compliance with the
                                                                                                                                                                                                                  P   P   P   P   P   P
        than established by Robust Details Ltd?                              Issue. Evidence requirements must be fully satisfied for the route chosen.

Hea 2   Where two houses are identical, but located on different sites, is it No, the requirement remains for houses of the same type to be tested on different sites. ‘Same’ constructions do vary in
        acceptable to have sound testing carried out on one house, and apply performance and these need to be verified separately. This is a Building Regulations requirement.
        the results to the house on the other site rather than undertaking                                                                                                                                        P   P   P   P   P   P
        additional sound tests?

Hea 3   Are there exceptions and circumstances when it is possible to claim  No.
        credits in Hea 3 if the private space does not allow access to all /
        meet the requirements of "BS8300:2001 Design of Buildings and their Hea 3 applies Sections 5 and 6 of BS8300 to the entire pathway leading to private space as recognised and rewarded by
        approaches to meet the needs of disabled people - code of practise"? the Issue.

                                                                               • For flats (regardless of which floor they are on) this pathway is from the communal entrance door of the building to the
                                                                               external private space
                                                                               • For dwelling-houses OR flats on the ground floor (or at street level) with a direct entrance access from the street,
                                                                               accessibility is from the entrance door of the dwelling to the external private space                                              P   P   P   P   P
                                                                               • In the case of balconies please see additional guidance given elsewhere in the FAQs

                                                                               Although the onus is on the design team to ensure this pathway is BS8300 compliant, amongst other requirements, the
                                                                               route must
                                                                               • not include any thresholds above 15mm (above 5mm and these will need to be chamfered or pencil rounded)
                                                                               • be at lest 900mm wide
                                                                               • level or having the shallowest possible gradient (at 1:20 or steeper, the pathway should conform to the recommendations
                                                                               for ramped access)
                                                                               • be made up of a firm, slip resistant and reasonably smooth surface.
Hea 3   Can glazed 'winter gardens' be considered as private space?            Common cases of non compliance of the Hea 3 Issue states "conservatories and other enclose areas do not comply the
                                                                               criteria". Enclosed winter gardens cannot be considered as an outdoor space.
                                                                               Winter gardens will comply with the criteria only if at least one side can be fully opened to the exterior (using e.g. shutters,
                                                                                                                                                                                                                  P   P   P   P   P   P
                                                                               sliding walls, or wing or terrace doors). Without this feature, winter gardens are regarded as a conservatory and do not
                                                                               comply with the criteria.

Hea 3   Do balconies used to gain credits in the Issue need to provide access Access to any balcony being recognised and rewarded by the Issue (whether serving a dwelling-house or flat) must comply
        in-line with BS8300:2001?                                             with Section 12.5.5 of BS8300:2001. These requirements include
                                                                              • external thresholds being level or at a height below 15mm (above 5mm and these will need to be chamfered or pencil
                                                                              rounded)
                                                                              • heights of centre rails and transoms incorporated into balcony access doors not obstructing the view of a wheelchair user         P   P   P   P   P
                                                                              or a seated ambulant disabled person
                                                                              • compliant balcony doors
                                                                              • compliant balcony balustrades

Hea 3   How should the requirement for private space to be "adjacent or in     We expect assessors and developers to use common sense when determining the acceptability and location of the private
        close proximity to the dwelling" be interpreted?                       space. The aim of this requirement is to ensure the space is available to people of all ages and physical mobility to enjoy;
                                                                               for this to be the case the space must be close enough to the dwelling that it is accessible for all users without undue effort
                                                                                                                                                                                                                  P   P   P   P   P   P
                                                                               and that the proximity to the dwelling creates a natural relationship between the space provided and the dwelling.
Hea 3   The evidence requirements of the Issue request that, for shared         Shared outdoor spaces should follow the guidance of the Metric Handbook that states such spaces should be
        outdoor, details of security/control measures be provided. What do      "demonstrably private, no matter what tenure arrangements apply, and that the territorial rights of the occupiers should be
        such measures entail?                                                   clearly marked." This can be achieved by using the buildings themselves, fencing, planting or other                               P   P   P   P   P   P
                                                                                barrier to seal off the space.

Hea 3   Where more than one area is provided to meet the space                  Where more than one area of private space have been recognised in order to award the Credit, it is necessary for all areas
        requirements of the Issue, do both areas need to meet the access        to meet the access standards of BS8300:2001.
                                                                                                                                                                                                                  P   P   P   P   P
        standards set out in BS8300:2001?

Hea 4   Please can you provide clarification regarding the Design criteria      Please see the Lifetime Homes website FAQ for clarifications in key areas of the criteria, including car parking
        within Lifetime Homes?                                                  requirements.
                                                                                                                                                                                                                  P   P   P   P   P   P


Hea 4   The Lifetime Homes (LTHs) checklist changes between the April 2008 The October 2008 version (also used in the May 09 version) of the Lifetime Homes (LTHs) checklist can be used for
        and the October 2008 of the Technical Guidance. Can I use the most projects registered under earlier versions of the Code. The checklist was updated to highlight the differences in applicability
        recent version of the checklist for assessments registered under   between different forms of dwellings.                                                                                                  P   P   P   P   P
        earlier versions of the Technical Guidance?

Hea 4   Do flats need to be served by a communal lift to achieve the Lifetime   Flats served only by stairs are able to achieve the Lifetime Homes (LTHs) standard (provided they meet all of the scheme
        Homes (LTHs) standard?                                                  requirements). But where a lift is specified/installed it must meet the requirements set out in criterion 5 of the LTHs scheme.
                                                                                                                                                                                                                  P   P   P   P   P


Hea 4   The Hea 4 issue in the 2010 version of the CSH technical guidance       This exemption can be applied where dwellings are on plots with a gradient exceeding 1:15. See the Special Cases section
        allows exemption from meeting Lifetime Homes criteria 2 and/or 3.       of the Hea 4 issue for a detailed explanation of the points between which the gradient should be measured.
        Can you explain when this can be sought?
                                                                                Where applicable the exemption allows dwellings to achieve 3 out of 4 credits for this issue as long as all other principles of
                                                                                                                                                                                                                                      P
                                                                                Lifetime Homes have been achieved. However, application of the exemption means that the dwelling cannot be deemed
                                                                                Lifetime Homes compliant and can not be marketed as such.


Hea 4   Can I use the newest version of the Lifetime Homes checklist (July      No. The July 2010 version of the Lifetime homes checklist must only be used to demonstrate compliance against the Nov
        2010) for projects registered to May 2009 or previous scheme            2010 version of the Code. Assessments registered to the May 2009 version of the Code and previous scheme versions
        versions?                                                               must use the older version of the Lifetime Homes checklist which is published in the Code technical guide.                        P   P   P   P   P   P
                                                                                Note that the previous versions of the Lifetime Homes checklist cannot be used for projects registered under the November
                                                                                2010 version of the Code.
Issue   FAQ                                                                  Answer                                                                                                                                                  Version
                                                                                                                                                                                                                 Apr-07 Oct-07 Apr-08 Oct-08 May-09 Nov-10
Man 1   In the Home User Guide (HUG) the client is supposed to               Under the definitions section of Man 1 it states that a home user guide should be provided in an appropriate format for
        include details of the procedure for obtaining a copy of the         users. This means that the procedure for obtaining a copy of the guide in an alternative format should be made clear to
        guide in alternative formats. Does this mean that the client is      occupants. If the occupant then requires the document in a particular language your client will need to provide the                   P      P      P         P   P      P
        expected to provide the guide in another language, if                requested translation/format.
        requested?

Man 1   Is the provision of an electronic version of the Home User           A hard copy is always required in order to achieve credits for Man 1. An internet accessed/electronic guide would only be
        Guide sufficient, or is a hard copy also required?                   acceptable where confirmation from each of the home owners has been provided stating that they would like an electronic
                                                                             copy of the Home User Guide.                                                                                                          P      P      P         P   P      P


Man 1   When completing a post construction review report do                 In the post construction evidence required to demonstrate compliance within the technical guidance it states "Copies of the
        assessors have to provide the Code Service Provider with a           Home User Guides for each type of dwelling covering all the issues required in Checklist Man 1 Part 1 or Parts 1 and 2". As
        hard copy of the home user guide Home User Guide (HUG) as            the technical guidance does not define which format the Home User Guide should be submitted to the Code service
        evidence?                                                            provider you may submit a copy of the Home User Guide (HUG) in any format. We will not accept photographs of the                      P      P      P         P   P      P
                                                                             Home User Guide (HUG) or confirmation from the assessor that the Home User Guide (HUG) has been produced.



Man 2   Are there any alternative schemes to the Considerate                 We do not have a list of alternative schemes that could be used to gain credits for Man 2. Alternative schemes tend to be
        Constructors Scheme (CCS) that can be used to gain credits           Local Authority run. If you need to assess an alternative scheme, please submit the details of the scheme, including the
        under Man 2?                                                         Man 2 checklist, to the Code Service Provider for approval. The approval process is necessary to ensure the equivalency of
                                                                             the standards set by the alternative scheme with Considerate Constructors. We must ensure consistency in the award of
                                                                             credits for this issue where alternative schemes are used. Checklist Man 2 has been provided so that, should an assessor              P      P      P         P   P      P
                                                                             need to assess a development using an alternative scheme, they will be able to check to see if it sets standards that are
                                                                             acceptable for use in the Code.


Man 2   I have a site that comprises several phases and I am just            The Considerate Constructors Scheme do make provision for phased developments within their registration process,
        starting to collect evidence for the first Post Construction Stage   allowing each phase to be registered separately. They make this provision to allow for very large developments that may go
        (PCS) report. Man 2 was included in the certified Design Stage       on over several years.
        (DS) report. The Schedule of Evidence for Man 2 Post
        Construction Stage Assessment (PCSA) requires the                    The situation with Code phasing is different, in that it is possible that Code dwellings will be released for sale (and therefore
        Considerate Constructors Scheme (CCS) Certificate but this           require Code certificates) gradually, perhaps only a few at a time. We recognise that it would be unreasonable to expect
        will not be issued till the end of the final phase so won't be       final Considerate Constructors Scheme (CCS) certificates to be issued for all of these releases (which would require each
        available when submitting the report for the first phase. What       of these groups of a few houses to be registered separately with CCS).
        do I do in this situation?
                                                                             With this in mind, we have decided that it is permissible to award credits for phased developments based on the latest site
                                                                                                                                                                                                                   P      P      P         P   P      P
                                                                             monitors report from CCS and a firm commitment from the developer. Where dwellings are to be released before the first
                                                                             site Monitors visit, it is permissible to award credits based on a firm commitment from the contractor or developer.

                                                                             When the final dwellings being assessed using the Code for Sustainable Homes are submitted for Post Construction Stage
                                                                             Assessment, the Considerate Constructors Scheme (CCS) site monitors report AND the final Certificate must be included
                                                                             in the evidence. Please note that this means that where Code assessed dwellings form part of a larger phased
                                                                             development and construction will not be completed on the site before the final Code dwelling is assessed, the
                                                                             development will need to be registered with Considerate Constructors Scheme (CCS) as more than one phase, with the
                                                                             Code dwellings forming a separate phase.

Man 2   I have heard that the Considerate Constructors Scheme have           The Considerate Constructors Scheme Constructors Scheme (CCS) certificate with the final Code assessed dwellings the
                                                                             If on submission of the final Considerate(CCS) new checklist took effect from 1 August 2008 and sites are likely to achieve
        changed the way they assess their sites. How does this affect        lower scores under the CCS than they used to. We have reviewed the change and do not feel that it would be appropriate
        the code?                                                            to change the credit criteria in the Code to make the requirements easier. The requirements of the code remain the same:
                                                                             a minimum score of 24 points is required to achieve compliance under this scheme and to achieve 1 credit under the code
                                                                             and a minimum point score of 32 under the Considerate Constructors Scheme (CCS) to achieve 2 credits. The changes
                                                                             will only affect those buildings which are at design stage which have yet to be assessed by the CCS. Those already under
                                                                             the Considerate Constructors Scheme (CCS) prior to 1st August will continue to be assessed under the previous CCS                     P      P      P         P   P      P
                                                                             scoring mechanism and this will still be in place until post construction stage. We acknowledge that it is more difficult to
                                                                             achieve the Code requirements using the updated more challenging CCS checklist. Whilst the requirements in CCS are
                                                                             more stringent now, this reflects a greater improvement in average performance on site, so to continue the rigour of the
                                                                             CCS scheme, increasing the performance requirements is an appropriate approach for CCS and the Code.
Man 2   The project I am involved with has been subject to two CCS         Please use the site monitor report score that the final CCS certificate is awarded against.
        site visits - both of which were scored. Is the score from both
        visits to be averaged when awarding credits or is the last site    If a site has been monitored more than once, the Certificate will be awarded based on the results of the final visit.               P   P   P   P   P   P
        visit score to be used?

Man 3   I am trying to locate the DTI?s (now BERR) environmental KPI KPIs can be gained by joining the KPIzone subscription service with details available from www.kpizone.com. This service
        benchmarks, where can I find them?                           carries a fee and is usually borne by the developer.                                                                                      P   P   P   P   P   P

Man 4   Can the credits be awarded with a part 2 Secured by Design         Full Secured by Design (SBD) accreditation is not required for Man 4 compliance but if it is achieved and the schedule of
        (SBD) certificate or is full SBD accreditation required?           evidence provided meets the requirements listed in the technical guidance, then full credits can be awarded. The
                                                                           requirements of section 1 of Secured by Design (SBD) go beyond the remit of the Code and as such, provided the ALO
                                                                           confirms that the development complies with section 2 of SBD - Physical Security, and the schedule of evidence provided
                                                                                                                                                                                                               P   P   P   P   P   P
                                                                           meets the requirements listed in the technical guidance, full credits can be awarded for Man 4.



Man 4   How will meeting the Secured by Design standard affect             "The SBD New Homes 2009 guidance document supports the objectives of The Code. Following the advice and
        achievement of other Code Issues?                                  requirements of SBD may lead to the scoring of various credits in The Code in addition to the 2 credits awarded for                 P   P   P   P   P   P
                                                                           complying with Section 2 of SBD New Homes 2009."
Man 4   I have a site that comprises several phases and I am just          The situation with Code phasing is different, in that it is possible that Code dwellings will be released for sale (and therefore
        starting to collect evidence for the first PCS report. Man 4 was   require Code certificates) gradually, perhaps only a few at a time. We recognise that it would be unreasonable to expect
        included in the certified DS report. The Schedule of Evidence      final Secured by Design (SBD) certificate to be issued for all of these releases
        for Man 4 PCSA states that a Secure By Design Certificate can
        be provided to demonstrate that section 2 of the Secured by        With this in mind, we have decided that it is permissible to award credits for phased developments based on a firm
        Design (SBD) checklist has been adhered to, however this will      commitment from the contractor/developer to ensure that all relevant aspects of Secured by Design (SBD) will be
        not be issued until the end of the final phase so won't be         implemented in line with the recommendations made by the ALO.
        available when submitting the report for the first phase(s).
        What do I do in this situation?                                    When the final dwellings being assessed using the Code for Sustainable Homes are submitted for Post Construction Stage
                                                                           Assessment, the Secured by Design (SBD) Certificate must be included in the evidence, if this is the chosen evidence type           P   P   P   P   P   P
                                                                           to demonstrate that section 2 of the SBD checklist will be adhered to.

                                                                           Please note this means that where Code assessed dwellings form part of a larger phased development and construction
                                                                           will not be completed on the site before the final Code dwelling is assessed, the development will need to be registered
                                                                           with Secured by Design (SBD) as more than one phase, with the Code dwellings forming a separate phase.

                                                                           If on submission of the final phase of the Code assessment the dwellings have not met the required standards in section 2
                                                                           of the Secured by Design (SBD) checklist, the Code Service Provider reserves the right to withdraw Code certificates or
                                                                           reduce the level achieved. The cost of re-issuing certificates will be carried by the developer.
Issue                                 FAQ                                                                                                Answer                                                                                     Version

                                                                                                                                                                                                                   Apr-07 Oct-07 Apr-08 Oct-08 May-09 Nov-10
                                                                            No, the ecologist should determine when it is appropriate to conduct the site visits. This will depend on the nature of the site.
        Are there a recommended number of site visits for the
                                                                            For example, a Greenfield site will change throughout the year, and some species may only be apparent at certain seasonal
Eco 1   ecologist to meet the requirements?                                                                                                                                                                          P      P      P      P      P      P
                                                                            periods. This may effect the number of visits required.

        If a development were located on land that was previously built No, as the ecological value of a site is dependent on a number of features, not necessarily related to whether the site was
        upon, would it automatically meet the criteria for being of low previously built on. To determine whether a site is of low ecological value, the checklist provided under the “Checklist and
Eco 1                                                                                                                                                                                                                P      P      P      P      P      P
        ecological value?                                               Tables” section of the Technical Guidance should be completed.

                                                                            The Code does not stipulate what time of year the ecologist’s report should be compiled. A suitably qualified ecologist will
        What time of year should the ecologists report be compiled?         be able to advise you on further on this matter.
Eco 1                                                                                                                                                                                                                P      P      P      P      P      P


                                                                            Where no site visit has been carried out prior to works commencing on site, the credits can still be achieved provided
        Where an ecologist has not carried out a site visit prior to
                                                                            evidence can be provided to the ecologist to show the features present prior to construction (site plans and photographs). If
        construction works commencing on site, can credits still be
Eco 1                                                                       the site was hard landscaping and evidence from plans and photographs show there was no value present, the credit can                    P      P      P      P      P      P
        achieved under Eco1?
                                                                            be awarded.

        Where the number of species calculated for 'Before                  No, although there is a zero native plant species count for Eco 4, the site may have ecological value in other forms (such as
        Development' in Eco 4 is zero, can it be assumed that the site      streams). The site may well preset other forms of ecological benefit from shelter, food and habitat, and therefore Eco 1
Eco 1   is of low ecological value, and that the Eco 1 credit can be        should be assessed separately using the Checklist provided under the “Checklist and Tables” section of the Technical                     P      P      P      P      P      P
        awarded by default?                                                 Guidance.

                                                                            Yes, a green roof can bring significant benefits to wildlife providing nesting material and food for birds (and promoting
                                                                            insects) so therefore should be accounted for when assessing Eco 2 and Eco 4. Input from a Suitably Qualified Ecologist
        Can a green roof be assessed under Eco 2 and Eco 4?                 will be required in order to allow the sedum or planting of the green roof to be acknowledged in these credits. The ecologist
Eco 2                                                                                                                                                                                                                P      P      P      P      P      P
                                                                            should confirm the relative species per hectare value for the roof whether this is sedum, semi-intensive or intensive green
                                                                            roof and recommend native species of plants that are of benefit to local fauna.

        Can enhancement measures put in place outside of the                Assessments are site specific and only enhancement measures included within the development site can be included as
Eco 2   development site be considered?                                     part of the assessment.                                                                                                                  P      P      P      P      P      P

                                                                            The Code does not stipulate what time of year the ecologist’s report should be compiled. A suitably qualified ecologist will
        What time of year should the ecologists report be compiled?         be able to advise you on further on this matter.
Eco 2                                                                                                                                                                                                                P      P      P      P      P      P


                                                                            If evidence can be provided that demonstrates issue Eco1 has been achieved, (e.g. site plans and photographs confirming
        Where an ecologist has not carried out a site visit prior to
                                                                            the value of the site prior to construction) to allow the ecologist to base their ecological recommendations on this, a site visit
        construction works commencing on site, can Eco2 still be
Eco 2                                                                       will still be required from the ecologist and the ecologist will need to be satisfied that there is sufficient evidence of the sites     P      P      P      P      P      P
        achieved?
                                                                            previous value in order to determine suitable recommendations.

                                                                            There is no reason why the site visit report can not be carried out by the Suitably qualified ecologist (SQE) and included
        Can the required site visit report be carried out by the Suitably
                                                                            within their ecologist's report.
Eco 3   qualified ecologist (SQE)?                                                                                                                                                                                   P      P      P      P      P      P


                                                                            The Code does not stipulate what time of year the ecologist’s report should be compiled. A suitably qualified ecologist will
        What time of year should the ecologists report be compiled?         be able to advise you on further on this matter.
Eco 3                                                                                                                                                                                                                P      P      P      P      P      P


                                                                            In this case it will need to be possible to demonstrate that any species prior to commencement on site have been protected
                                                                            in order to determine whether Eco3 can be awarded. Where an ecologist is determining whether a feature is being
        Where an ecologist has not carried out a site visit prior to        adequately protected, evidence showing the features present prior to works commencing on site will need to be provided to
        construction works commencing on site, can credits still be         the ecologist to allow them to see what was present. They will also need to be provided with details of protection measures
Eco 3                                                                                                                                                                                                                P      P      P      P      P      P
        achieved under Eco3?                                                put in place and carry out a site visit to check that the species have not been damaged and protected adequately. Where
                                                                            there are no species to protect and evidence from before site works commenced demonstrates this, Eco3 can be achieved.



        Where no ecologist report has been provided, but the design
        team has provided confirmation that protection measures will        Yes, as long as protection is in accordance with the requirements and the relevant evidence is provided, an ecologist does
Eco 3   be adopted according to BS5837 trees in relation to                 not have to be appointed in order to achieve this credit.                                                                                P      P      P      P      P      P
        Construction, can Eco 3 credits still be achieved?
                                                                          No, translocation is not acceptable as the credit is looking at the protection of existing features without removal as this
        Would translocation of a valued ecological feature be
                                                                          would disturb the existing site’s value. Only protection of these features in accordance with the requirements set out in the
Eco 3   classified as protection?                                                                                                                                                                           P   P   P   P   P   P
                                                                          Technical Guidance is acceptable.

                                                                          Yes, a green roof can bring significant benefits to wildlife providing nesting material and food for birds (and promoting
                                                                          insects) so therefore should be accounted for when assessing Eco 2 and Eco 4. Input from a Suitably Qualified Ecologist
        Can a green roof be assessed under Eco 2 and Eco 4?               will be required in order to allow the sedum or planting of the green roof to be acknowledged in these credits. The ecologist
Eco 4                                                                                                                                                                                                       P   P   P   P   P   P
                                                                          should confirm the relative species per hectare value for the roof whether this is sedum, semi-intensive or intensive green
                                                                          roof and recommend native species of plants that are of benefit to local fauna.

        Can enhancement measures put in place outside of the              Assessments are site specific and only enhancement measures included within the development site can be included as
Eco 4   development site be considered?                                   part of the assessment.                                                                                                           P   P   P   P   P   P

        Can the provision of an internal garden contribute towards        No, an internal enclosed garden would not be included in the Eco 4 assessment as it is not available to wildlife as an
Eco 4   achieving credits under Eco 4?                                    ecological resource.                                                                                                              P   P   P   P   P   P

        Can the provision of window boxes contribute towards
                                                                          No, window boxes should be excluded from the Eco 4 assessment as they are dependent on a high level of maintenance
Eco 4   achieving credits under Eco 4?                                                                                                                                                                      P   P   P   P   P   P
                                                                          from the outset.

Eco 4   How are allotments accounted for under Eco 4?                     Allotments would count as being arable land with the plot being crops/weeds.                                                      P   P   P   P   P   P
                                                                          Green walls can be considered in Eco4. This should be taken account of in the change of ecological value calculation by
                                                                          including the area of façade used for the green wall in the calculations as a specific plot type. It should be included for the
        How do you take account of Green Walls in the change of
                                                                          site area for both before and after development. Before development the area used for the green facade should be                  P   P   P   P   P   P
Eco 4   ecological value calculation?
                                                                          indicated as hard landscaping and after development it should be indicated with the species numbers provided by the
                                                                          suitably qualified ecologist.

        What is grazed land classed as for Eco 4?                         Pastoral.
Eco 4                                                                                                                                                                                                       P   P   P   P   P   P
                                                                          The CSH does not stipulate what time of year the ecologist’s report should be compiled. A suitably qualified ecologist will be
        What time of year should the ecologists report be compiled?       able to advise you on further on this matter.
Eco 4                                                                                                                                                                                                       P   P   P   P   P   P


                                                                       As the car park is not a habitable space, it cannot be counted as part of the “net internal floor area”. However, when
        If a development is located over a car park, how do you assess calculating the “net internal ground floor area”, it is necessary to use either the footprint of the dwelling (had this been
Eco 5   the development for credits under Eco 5?                       directly on the ground) or the footprint of the car park, whichever is greater.                                                      P   P   P   P   P   P


                                                                          This is automatically calculated in the assessment report tool using the following formula to calculate the target ratio;

                                                                          For 1 credit; (2.5 x NIFA Houses + 3.0 x NIFA Flats) / Sum of all
        On developments with a mixture of flats and houses, how are
Eco 5   the achieved credits calculated for Eco 5?                                                                                                                                                          P   P
                                                                          For 2 credits; (3.0 x NIFA Houses + 4.0 x NIFA Flats) / Sum of all



        The Technical Guidance when defining Net Internal Ground
        Floor Area for Eco 5, states that this is the area taken up by
                                                                          Please count only the ground floor area inside the external walls. 'Foundations' can include a raft or slab on grade, beam
        the permanent foundations of the dwelling within the external
                                                                          and block or other construction methods used for the ground floor substructure - hence the reference to foundations within
Eco 5   walls of the building. Do foundations have to be taken into                                                                                                                                         P   P   P   P   P   P
                                                                          external walls within the Technical Guidance.
        consideration for the purpose of the Eco 5 net ground floor
        area calculations?

        Where the assessed development is part of a larger building       Yes, credits under Eco 5 can be achieved. The assessment would be carried out across the whole building envelope,
Eco 5   envelope, can credits be achieved under Eco 5?                    including those dwellings that are not being assessed.                                                                            P   P   P   P   P   P
                                                                          The guidance on calculating this ratio has not changed from previous scheme versions and has changed in the November
                                                                          2010 Guidance due to a formatting error. Refer to the following text for the clarified calculation procedure:

                                                                          Where there is a mixture of houses and flats, to calculate the area weighted target ratio for the site, use the following
                                                                          formula:

                                                                          For one credit:
        The formula to calculate the area weighted target building
        footprint ratio for the site where there is a mixture of flats and Area Weighted Target Ratio
Eco 5   houses has changed in the November 2010 guidance. What is                                                                                                                                     P
        the reason behind this change?                                       (Total NIFA Houses × 2.5) + (Total NIFA Flats × 3.0)
                                                                           = -----------------------------------------------------
                                                                                      Total NIFA of all Houses and Flats

                                                                          For two credits:

                                                                          Area Weighted Target Ratio

                                                                            (Total NIFA Houses × 3.0) + (Total NIFA Flats × 4.0)
                                                                          = -----------------------------------------------------
         Glossary

ACoP
ACPO
AD L1A
ADE
ALO
ANC
ASHP
AWTC

BBA
BERR
BRE
BREEAM
BS
BSRIA

CABE
CCS
CEH
CHP
CHPQA
CFC
CFL
CH4
CIBSE
CIE
CIRIA
CITES
CIWEM
CO2
CoC
Code
CSH
CPDA
CPET
CSA
CSH
DECC
DEFRA
DER
DF
DfT
DIY
DS
DTI

Eco
EMAS
EMS
EN
Ene
EPC
EPDM
EPIs
ESCO
EST
EU

FEH
FRA
FGHR
FSC

GLS
GRP
GWP

HCR Hea
Hea
HLP
HFCs
HIP
HMSO
HSE
ICoP IDP
IEEM
IEMA
IPCC

ISO

KPI

LCA
LED
LI
LZC

Man
Mat
MCS
MDF
MTCC
MVHR

NAEI
NaFRA
NHBC
NIFA NIGFA
NOx

O2
ODP
ODPM
OSB

PCS
PCSA
PEFC
PFCs
PIR
Pol
PPG
PPS
PU
PV
PVC

QA

RDL
RIBA

SAP
SBD
SF6
SFI
SGS
SMP
SQE
SSSI
SUDS
Sur
SWMP

TER
TFT
TPO

UK
UKAS
UKPIA
UNEP

VOC
VOS

Was
Wat
WMO
WRAP
                           Glossary

Approved Code of Practice
Association of Chief Police Officers
Approved Document L1A
Approved Document E
Architectural Liaison Officer
Association of Noise Consultants
Air-Sourced Heat Pumps
Association of Wildlife Trust Consultancies

British Board of Agreement
(Department for) Business, Enterprise and Regulatory Reform
Building Research Establishment
Building Research Establishment Environmental Assessment Method
British Standard
Building Services Research and Information Association

Commission for Architecture and the Built Environment
Considerate Constructors Scheme
Centre for Ecology and Hydrology
Combined Heat and Power
Combined Heat and Power Quality Assurance
Chlorofluorocarbon
Compact fluorescent lamp
Methane
Chartered Institution of Building Services Engineers
Commission Internationale de l’Eclairage (International Commission on Illumination)
Construction Industry Research and Information Association
Convention on International Trade in Endangered Species of Wild Fauna and Flora
Chartered Institution of Water and Environmental Management
Carbon dioxide
Chain of custody
Code for Sustainable Homes
Code for Sustainable Homes
Crime Prevention Design Advisor
Central Point of Expertise on Timber
Canadian Standards Association
Code for Sustainable Homes
Department for Energy and Climate Change
Department for Environment, Food and Rural Affairs
Dwelling Emission Rate
Average daylight factor
Department for Transport
Do It Yourself
Design stage
Department for Trade and Industry

Ecology / Ecological
Eco-Management and Audit Scheme
Environmental Management System
European Normalization
Energy and CO2 Emissions
Energy Performance Certificate
Ethylene propylene diene monomer
Environmental performance indicators
Energy services company
Energy Saving Trust
European Union

Flood Estimation Handbook
Flood risk assessment
Flue Gas Heat Recovery
Forest Stewardship Council

General Lighting Services
Glass reinforced plastic
Global Warming Potential

Home Condition Report - Health and Wellbeing
Health and Wellbeing
Heat Loss Parameter
Hydrofluorocarbons
Home Information Pack
Her Majesty’s Stationery Office
Health and Safety Executive
Interim Code of PracticeInclusive Design Principles
Institute of Ecology and Environmental Management
Institute of Environmental Management and Assessment
Intergovernmental Panel on Climate Change

International Organization for Standardisation

Key performance indicators

Life cycle assessment
Light emitting diode
Landscape Institute
Low or zero carbon

Management
Materials
Microgeneration Certification Scheme
Medium density fibreboard
Malaysian Timber Certification Council
Mechanical ventilation with heat recovery

National Atmospheric Emissions Inventory
NAtional Flood Risk Assessment
National HouseBuilding Council
Net internal floor areaNet internal ground floor area
Nitrogen oxides

Oxygen
Ozone Depletion Potential
Office of the Deputy Prime Minister
Oriented strand board

Post construction stage
Post Construction Stage Assessment
Programme of Endorsement of Forest Certification Schemes
Perfluorocarbons
Passive infra red (movement detecting devices)
Pollution
Planning Policy Guidance
Planning Policy Statement
Polyurethane
Photo Voltaics
Polyvinyl chloride

Quality assurance

Robust Details Limited
Royal Institute of British Architects

Standard Assessment Procedure
Secured by Design
Sulphur hexafluoride
Sustainable Forestry Initiative
Société Générale de Surveillance
Shoreline management plan
Suitably qualified ecologist
Site of Special Scientific Interest
SUstainable Drainage Systems
Surface Water Run-off
Site Waste Management Plan

Target emission rate
The Forest Trust
Thermoplastic olefin

United Kingdom
United Kingdom Accreditation Service
United Kingdom Petroleum Industry Association
United Nations Environment Programme

Volatile organic compound
View of the Sky

Waste
Water
World Meteorological Organization
Waste and Resources Action Programme
on Illumination)

				
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