Carports in DC are treated as accessory structures under DCMR Title 11 Subtitle D and require a Department of Buildings building permit. Typical rear yard setbacks are 5 feet from side and rear property lines, with maximum accessory structure height of 20 feet and lot coverage caps based on zone. Historic districts require HPRB approval for any visible carport.
Carports in DC fall under the accessory structure provisions of the DC Zoning Regulations (DCMR Title 11 Subtitle D section 304 for R zones). A DOB building permit is required for any carport, regardless of whether it is attached or freestanding, prefabricated or custom-built. Zoning standards for R-zone carports include: 5-foot minimum side and rear setback, maximum height of 20 feet (or 15 feet in some R-3 areas), and inclusion in the lot occupancy percentage (typically 40-60 percent depending on zone). Structural requirements under the 2017 DC Construction Codes include 90 mph wind uplift design, 30-pound-per-square-foot snow load, and fire separation from property lines (5/8-inch Type X drywall required on underside if closer than 3 feet). Most of DC's rowhouse neighborhoods have little rear yard space, making carports impractical; they are most common in Ward 3 single-family detached areas and on some larger Ward 7/8 lots. Historic districts treat carports strictly as non-traditional and usually deny new visible construction. Off-street parking in the front setback is generally prohibited under DCMR 11-C 704.
Unpermitted carport: stop-work order plus $2,000 fine and mandatory removal or retroactive permitting. Encroachment into required setback: variance required or removal. Historic district violation: up to $10,000 under DC Code 6-1110.
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See how District of Columbia's carport rules rules stack up against other locations.
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