Tiny home rules in Washington, DC — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
DC does not recognize tiny homes on wheels as legal dwellings. Permanent tiny homes on foundations must meet full DC Construction Code and zoning minimum lot and setback rules. Accessory dwelling units are allowed as a separate pathway.
DC Zoning Regulations do not include a tiny-home category. A structure on wheels is treated as a recreational vehicle and cannot be used as a permanent residence. Permanent tiny homes on foundations must meet the full DC Construction Code including minimum room sizes (IRC 304), minimum ceiling height of 7 feet, and every zoning rule applicable to the lot. Most DC lots are too small or already fully developed for a detached second dwelling, so ADU (accessory dwelling unit) conversions of basements, attics, or garages offer the realistic pathway. Matter-of-right ADUs are allowed in R-1, R-2, R-3 zones under ZR16. DOB permits and BBL are required for any ADU rental.
DOB stop-work and occupancy denial; zoning violation fines $500 to $2,000 per day until cured.
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See how Washington's tiny homes rules stack up against other locations.
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