UFC 4-711-01
13 July 2006
4-1.2
Unit Floor Area Calculation.
Gross floor area should be calculated using American National Standard for Single-
Family Residential Buildings, Square Footage-Method for Calculating: ANSI Z765. Net
floor area is defined as the area within interior faces of exterior walls and party walls of
living units, with the following exclusions:
Utility Rooms and Laundry Rooms;
Interior and Exterior Bulk Storage;
Space for washer and dryer, maximum area of 2.8 m2 (30 ft2), when not
located in separate utility or laundry room;
Space for furnace or boiler, water heater, heat pump, or solar equipment,
if any, when not located in separate utility room;
Stairways on each floor (including intermediate landings between floors);
Stair landing at each floor level, maximum 0.9 m2 (10 ft2) per floor;
Finished space under stairs;
Unfinished attic space;
Unfinished basement space;
Porches (open, screened, or enclosed), which are not heated, cooled, or
insulated, and which retain basic characteristics of a porch;
Arctic entries, maximum area of 1.8 m2 (20 ft2), in northern climates;
Recreation rooms, maximum area of 28 m2 (300 ft2), in harsh climates;
Terraces, patios, and balconies;
Carports and garages;
Common stairway, halls and entries in multifamily dwellings; and
Areas required, solely to comply with accessibility standards, maximum
area of 7 m2 (75 ft2).
Note: Appendix C contains examples for calculating net area.
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