CALGARY HOME BUILDERS ASSOCIATION SQUARE FOOTAGE CALCULATION GUIDELINES FOR CONSTRUCTION PURPOSES The Calgary Home Builders Association has undertaken a clarification and revision of its current policy and procedure in calculating the square footage of residential Real Estate. The basic premise of these guidelines is that the Total Floor Area (T) of all residential property is the sum of all floor areas situated above grade excluding porches, decks, patios, garages, carports, and other areas above grade that are not serviced with both heating and electrical. The Total Floor Area (T) on residential property is always calculated by using outside wall measurements. Total Floor Area (T): There are three components for calculating total floor area: - Main Floor (M) - Upper Floor (U) - Above Grade Floor Area (A) Main (M) is the developed main floor area using outside wall measurements of a bungalow, bi-level, split level, two storey, two storey split, 1 and 2 storey, 2 and 2 storey, three storey or 5 level split. Areas not included in Main Floor: - Those clearly open to the floor below including plant ledges. - Cantilever(s) enclosing fireplaces and flue chases only. Upper (U) is the developed upper floor area using outside measurements of a 1 and ½ storey, 2 storey, 2 and ½ storey, 2 storey split, 3 storey, or 5 level split, but does not include vaulted areas open from the upper floors to the main floors. Areas not included in upper area: - Those clearly open to the floor below (including plant ledges) - Cantilever(s) enclosing fireplaces and flue chases only. Above Grade (A) is the developed floor area, (totally above grade), of areas that have a permanent foundation, are serviced by both heating and electrical, and are suitable for year round use. These may include areas of the home, converted garages, attached atriums, porches, enclosed swimming pools, etc. There are two other categories to report floor area which are not included in Total Floor Area (T): - Lower (L) - Basement (B) Lower (L) is the developed floor area using inside measurements of below grade living areas (usually, but not necessarily third level or multi-level homes). Areas are calculated using the inside of the concrete wall and/or exterior of walk out wall areas at grade. Basement (B) is the developed floor area using inside measurements of below grade basement levels. Areas are calculated using the inside of the concrete wall and/or exterior of walk out wall areas at grade.