Building permits, zoning and land rules in the District of Columbia

DC has no counties, so there is no county government offering a different residential building-permit system². Construction, reconstruction, conversion and alteration of buildings in the District require a DOB building permit¹. Specified minor work has exemptions, but those exemptions do not apply in historic districts and do not provide a general exemption for building a home⁷.

A homeowner of a single-family or two-family home may attest as contractor of record; that owner-builder pathway still requires a building permit⁵. See the DC owner-builder guide for the related local answer⁵. Residential applications use the Permit Wizard and digital plan review through ProjectDox⁸.

District zoning authority rests with the Zoning Commission, and DC has no counties with separate unincorporated-area zoning powers². The official interactive zoning map supports parcel-level classification searches and is updated daily⁹. Start with the lot’s mapped zone before deciding whether the proposed house fits⁹.

New residential lots of record have zone-specific area and width requirements, with exceptions and separate provisions for certain developments¹⁰. For example, the ordinary minimum lot area in R-1A is 7,500 square feet and the minimum width is 75 feet¹⁰. Subdivision plats receive zoning-compliance review, including minimum lot size and width; the District Surveyor handles subdivision rather than a county office¹¹.

We could not confirm the DC agency that approves private septic systems, or a current private-septic permit and inspection procedure; ask DOB to identify the approving office before making a purchase dependent on on-site sanitation¹. For a developed lot containing a dwelling on a District street with a public sewer and water main, District law requires the applicable sewer and water connections³.

A water or sewer excavation permit covers pipe installation, connections to street mains, and excavation for meters or meter vaults in public space; only licensed DC contractors in the specific trade may apply¹². A home-building permit therefore should not be treated as approval for every utility connection or a private sanitation alternative^1,12.

We could not confirm general permission to occupy an RV, manufactured home or tiny home on a private DC lot; ask DOB about the proposed address, structure and use before relying on that living arrangement¹. DC does have a narrow camping provision for an owner camping on an alley lot in the R, RF and RA zones⁴.

That alley-lot use may last no more than 2 consecutive weeks and 1 month per calendar year, must avoid objectionable effects on nearby property, and may not involve open fires⁴. Those conditions describe temporary alley-lot camping, not approval for year-round RV housing⁴. A single-family dwelling needs an approved building final inspection before occupancy even though a Certificate of Occupancy is not required¹³.

DC has no counties to choose between for a different building-permit or zoning regime; evaluate the particular lot and proposed use instead^1,2. The District of Columbia local guide covers the area listed with required building permits¹⁴.

For a parcel purchase, zoning classification and subdivision compliance determine whether the planned lot and building can proceed^9,11. Floodplain projects require review by DOB and DOEE, with agency approvals resolved before DOB issues the building permit¹⁵. A new driveway or curb cut using public right-of-way needs DDOT approval, and off-street parking generally must use public-alley access unless the specified hardship exception is established¹⁶.

Most well construction in the District requires a well-construction permit, and the rules include soil borings as well as wells⁶. For private property, obtain the initial DOB soil-boring permit number before submitting the detailed application to DOEE; public-space projects begin with a DDOT tracking number⁶.

DOEE requires a Work Plan, Site Plan and Environmental Questionnaire with every well permit application⁶. Narrow exemptions exist for qualifying infiltration tests, stormwater best-management practices and temporary shallow projects meeting every listed condition; a shallow bore alone does not establish an exemption⁶. Where a dwelling lot has the public mains covered by District law, the water and sewer connection requirements still apply³. Do not budget for an independent well as a substitute for those required connections without resolving the proposal with DOB and DOEE^3,6.