Do you need a permit for a detached garage in Washington, DC?
Yes. Any garage is well beyond DC's 50 sq ft shed exemption.
A garage can't sit in the required rear yard without a special exception, which catches most alley garages on rowhouse lots.
Measure the 7.5 ft alley setback from the alley centerline, not the lot line.
Rules last checked by a person on October 20, 2026. Guidance only; confirm with Washington before you build.
Check your exact lot
Setbacks depend on your zoning district, and a flood zone can change the permit answer. Enter your address to see both.
Permits a detached garage can need in Washington
| Permit | When it applies |
|---|---|
| Building permit | Any garage is well beyond DC's 50 sq ft shed exemption. |
| Zoning review (and BZA special exception if in the required rear yard) | Zoning reviews the garage's location, footprint, height and lot occupancy with the building permit. In the required rear yard it needs a BZA special exception. |
| Floodplain development permit | If the lot is in a FEMA special flood hazard area, all development there needs a permit. |
| Electrical permit | Wiring needs its own permit.Confidence: medium |
R-1 (R-1-A, R-1-B) detached houses
| Location | Not in front of the house and not in the required 25 ft rear yard (special exception needed)Confidence: medium |
|---|---|
| Side setback | 3 ft from a side lot line shared with another lotConfidence: medium |
| Rear setback | Outside the 25 ft required rear yard; 7.5 ft from any alley centerlineConfidence: medium |
| Height | 22 ft and 2 stories |
| Footprint | 650 sq ft or 30% of the required rear yard, whichever is greater |
R-2 and R-3 semi-detached and row houses
| Location | Not in front of the house and not in the required 20 ft rear yard (special exception needed)Confidence: medium |
|---|---|
| Rear setback | Outside the 20 ft required rear yard; 7.5 ft from any alley centerlineConfidence: medium |
| Height | 22 ft and 2 stories |
RF rowhouse zones (RF-1 to RF-5)
| Location | Not in the 20 ft required rear yard; a garage at the alley end of a rowhouse lot usually needs a special exception (E § 5201) |
|---|---|
| Rear setback | Outside the 20 ft required rear yard and 7.5 ft from the alley centerline |
| Height | 22 ft and 2 stories |
| Footprint | 550 sq ft or 30% of the required rear yard, whichever is greater |
| Lot occupancy | Counts toward the 60% cap (70% by special exception) |
Local details
- Call 811 at least a few days before you dig footings or post holes. Utility locating is free.
- HOA covenants and deed restrictions can be stricter than city rules. Check yours before you build.
How to apply
Questions people ask
- When does a detached garage need a building permit in Washington?
- Any garage is well beyond DC's 50 sq ft shed exemption.
- Do I also need a zoning permit for a detached garage in Washington?
- Zoning reviews the garage's location, footprint, height and lot occupancy with the building permit. In the required rear yard it needs a BZA special exception.
- How far from the property line can a detached garage go in Washington?
- Side setback: 3 ft from a side lot line shared with another lot. Setbacks vary by zoning district; check your exact lot for the district that applies.
- Where do I apply for a detached garage permit in Washington?
- Apply through Department of Buildings, or call (202) 671-3500.
Sources
- DC Department of Buildings, How to get a permit. Checked 2026-10-20.
Unless you are in a historic district, the following work does not require a building permit: ... Single garden storage shed that does not exceed 50 square feet (4.65 m2) in area and is less than 10 feet (3048 mm) in overall height ... Repair of existing fe…
- DC Zoning Regulations, accessory buildings (11-D §§ 5000-5005, 11-E §§ 5000-5005), as amended by ZC Case 25-12. Checked 2026-10-20.
Accessory buildings: 22 ft and 2 stories; footprint the greater of 30% of the required rear yard or 650 sq ft (R-1, R-2) / 550 sq ft (R-3, RF); not in the required rear yard except a shed; 7.5 ft from the centerline of any alley; in R zones 3 ft from a side…
- 44 CFR 59.1, definition of development (NFIP). Checked 2026-10-19.
Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures...
- 44 CFR 60.3, floodplain management criteria. Checked 2026-10-19.
Require permits for all proposed construction or other development in the community...
- 2024 IRC R105.2, Work exempt from permit (text published by the City of Benson, AZ). Checked 2026-10-19.
One-story detached accessory structures, provided that the floor area does not exceed 200 square feet. Fences not over 7 feet high. Decks not exceeding 200 square feet in area, that are not more than 30 inches above grade at any point, are not attached to a…