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Zoning Guide

ADU Rules in Brightwood, Washington DC

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ADU Rules in Brightwood, Washington DC

Brightwood is a quiet residential neighborhood in upper Northwest DC (Ward 4), bounded by Rock Creek Park to the west and Georgia Avenue to the east. Known for its detached single-family homes and tree-lined streets, Brightwood offers good potential for detached ADUs on larger lots. DC Zoning Regulations (Title 11 DCMR) govern ADUs district-wide.

DC-Wide ADU Framework

DC Zoning Regulations govern accessory apartments across all DC neighborhoods. The zone designation for your specific property determines the applicable standards.

Permitted ADU Types

  • Detached Accessory Dwelling: Standalone structure — Brightwood's larger lots are well-suited
  • Attached ADU: Addition with own entrance
  • Interior Conversion: Basement or upper floor conversion

Zoning Context

Brightwood is primarily R-1 and R-2 (single-family residential) and some RF zones. Verify your parcel's zone at DC's Interactive Zoning Map. Larger lots in R-1 zones may allow detached ADUs.

Size Limits

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

Setbacks

Per applicable zone:

  • Front: Per base zone (typically 25 feet for R-1)
  • Side: 3–8 feet minimum
  • Rear: 15–25 feet minimum

Height

  • Detached ADU: Maximum 15 feet in residential zones
  • Cannot exceed height of primary dwelling

Rock Creek Park Proximity

Properties near Rock Creek Park may have additional environmental or buffer zone considerations. Verify with DC Department of Energy and Environment if applicable.

Permit Process

  1. Check zoning: Confirm zone via DC Interactive Zoning Map
  2. DC Office of Zoning: Verify ADU eligibility
  3. Submit permit: DC Department of Buildings
  4. 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.

More about Brightwood Zoning

Sources

  1. DC Zoning Regulations — Title 11 DCMR·dcoz.dc.gov·Accessed 2026-04-07·Direct link
  2. DC Department of Buildings — Building Permits·dob.dc.gov·Accessed 2026-04-07·Direct link

FAQ

Are ADUs allowed in Brightwood, Washington DC?
Yes. DC Zoning Regulations permit accessory apartments (ADUs) in residential zones throughout the district, including Brightwood in upper Northwest DC.
What zone is Brightwood in?
Brightwood is primarily zoned R-1 through R-3 (single-family and low-density residential) and RF (Row House residential). Verify your parcel's zone at DC's Interactive Zoning Map.