D.C. Mun. Regs. tit. 11-D, § 701
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701.1 In the R-1A/WH and R-1B/WH zones, the GFA of all buildings and structures on a lot shall not exceed the sum of two thousand square feet (2,000 sq. ft.) plus forty percent (40%) of the area of the lot, subject to the following:
(a) GFA shall not include:
(1) The first two hundred square feet (200 sq. ft.) of an open porch, or total open porch space if there is more than one (1) open porch; and
(2) The first six hundred square feet (600 sq. ft.) of a garage shall not count in GFA; and
(b) GFA shall include basement or cellar floor area with a finished floor and a floor-to-ceiling height in excess of six feet, six inches (6 ft., 6 in.); provided that this addition to GFA shall count only up to a floor area equal to five (5) times the total fenestration area for the entire basement or cellar floor area, including that with unfinished floor and floor-to-ceiling heights below six feet, six inches (6 ft., 6 in.).
SOURCE: Final Rulemaking published at 63 DCR 2447, 2834 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).