Washington, DC Building Setbacks & Zoning: Lot Coverage Limits (2026)

DCMR Subtitle D governs the R-1 (detached houses on larger lots), R-2 (semi-detached houses), and R-3 (row houses on small lots) zones, and Chapter 2's development standards apply to all of them unless a geographically modified zone changes the numbers. 1's Table D sets the ceiling by structure type rather than by a single flat percentage: an ordinary single-family or semi-detached dwelling, listed as "All Other Structures," is held to 40% lot occupancy, while a place of worship may cover 60% of its lot and, because R-3 is built for attached row houses, a Single Household Row Building there is allowed the same 60%.

Public recreation and community centers are capped lowest, at 20%, reflecting the desire to keep open yard space around institutional uses. Lot occupancy interacts with Section 211's minimum pervious surface requirement, so a project sized to the 40% or 60% ceiling still has to leave enough unpaved ground to meet the separate drainage standard. Compliance is checked when plans are submitted: under Subtitle A Section 301, the Department of Buildings' Zoning Administrator will not issue a building permit unless the plans conform to the zoning regulations, including the lot occupancy table for the applicable zone.

A project that cannot meet the percentage on its lot can seek relief only through a variance or special exception from the Board of Zoning Adjustment under Subtitle X, Chapter 9; there is no administrative waiver at the permit counter. The current version of these R-zone standards was last amended by Final Rulemaking Order No. 18-16/19-27-19-27B, published at 70 DCR (August 25, 2023).