Accessory dwelling unit contractor

Looking for accessory dwelling unit contractor in Washington, DC? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Washington and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

A contractor manages the trades, materials, and timeline required to complete your backyard home. You need a contractor when you have design plans ready or need a lead to coordinate electricians, plumbers, and carpenters to get the structure move-in ready. They act as your project manager, ensuring that the work is finished on schedule and adheres to the building plans filed with your local municipality. Their role is essential for keeping the construction phase organized and safe.

Frequently asked in Washington

What are the disadvantages of ADUs?

Potential disadvantages of ADUs include increased utility usage for the main house and potential impacts on parking in already tight D.C. neighborhoods. Some historic districts may have design restrictions. Discuss these concerns with the pros when you call for advice.

How much does an ADU cost in D.C.?

What are the rules for ADUs in D.C.?

Can I build an ADU in my D.C. backyard?

Yes, D.C. generally permits ADUs in backyards, provided they adhere to zoning regulations regarding size, height, and proximity to property lines. Alley access is often a consideration for detached units. A licensed, insured pro can confirm feasibility for your specific property.

What permits are needed for an ADU in D.C.?

You will need to secure building permits from the D.C. Department of Buildings, which involves submitting detailed plans for review. This ensures your ADU meets all safety and code requirements. The pros who come out are familiar with the D.C. permitting process and can guide you.

What are popular ADU designs for D.C.?

Also serving nearby: Alexandria · Baltimore · Richmond · Reading · Philadelphia

All cities in District of Columbia →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

678,972residents

11,107per sq mile

8ZIP codes served

Serving all of Washington — population 678,972; about 11,107 residents per square mile across 61.1 sq mi. ZIP codes covered include 20001, 20002, 20003, 20004, 20005, 20006, 20007, 20008.

Neighborhoods served in Washington: Georgetown, Capitol Hill, Adams Morgan, Dupont Circle, U Street Corridor, Shaw — and every surrounding area.