ADU Rules in Adams Morgan, Washington DC

Adams Morgan is one of DC's most diverse and vibrant neighborhoods, known for its multicultural character, international restaurants, and lively nightlife on 18th Street NW and Columbia Road NW. DC Zoning Regulations (Title 11 DCMR) govern ADUs district-wide — there are no neighborhood-specific ADU rules.

DC-Wide ADU Framework

The District of Columbia revised its zoning regulations comprehensively in 2016. Accessory apartments (the DC term for ADUs) are governed by 11 DCMR.

Permitted ADU Types

• Accessory Apartment: Interior conversion of existing residential building
• Detached Accessory Dwelling: Standalone structure on the lot
• English Basement: Below-grade unit with separate entrance — common in Adams Morgan row houses

Zoning Context

Adams Morgan is primarily zoned RF-1 through RF-3 (Row House Residential) with some MU (Mixed Use) areas. The applicable zone determines:

• Maximum lot occupancy
• Setback requirements
• Height limits

Size Limits

• Generally limited to 800 sq ft or percentage of primary dwelling area
• Interior conversions limited to the existing footprint

Setbacks

Per applicable zone:

• Front: Per base zone
• Side: 3–5 feet minimum
• Rear: 12–20 feet minimum

Height

• Detached ADU: Maximum 15 feet or per zone height limit
• Cannot exceed height of primary dwelling

Historic Preservation

Parts of Adams Morgan are within or adjacent to historic districts. Check with DC Historic Preservation Office (SHPO) for any applicable review requirements.

Owner Occupancy

DC may require owner occupancy of the primary dwelling. Verify current requirements with DC Office of Zoning.

Parking

Adams Morgan is in a densely urban area with transit access. DC may waive parking requirements for ADUs near transit. Verify current parking standards.

Permit Process

1. Check zoning: Confirm zone designation via DC's Interactive Zoning Map
2. DC Office of Zoning: Verify ADU eligibility for your zone
3. Historic review: If applicable
4. Submit permit application: Through DC Department of Buildings
5. Inspections and CO: Required before occupancy

Contact

DC Department of Buildings 1100 4th Street SW, Washington, DC 20024 Phone: (202) 671-3500 Website: dob.dc.gov

DC Office of Zoning 441 4th Street NW, Suite 200-S, Washington, DC 20001 Phone: (202) 727-6311 Website: dcoz.dc.gov

Disclaimer: Verify current DC Zoning Regulations with the DC Office of Zoning before starting any project. Zoning regulations change and neighborhood context varies.