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ADU builders in Washington, DC

The ADU builders from Google's results for Washington, DC, District of Columbia, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.

Last updated

Garage conversion ADU
$63,500 – $159,000existing structure
Detached ADU
$159,000 – $424,000new build, utilities
Prefab ADU
$127,000 – $318,000unit, foundation, install
Washington, DC vs US
+6%above the US median

Licensing in District of Columbia. DC requires a home improvement contractor license from the Department of Licensing and Consumer Protection (DLCP).

The ranked list of ADU builders in Washington, DC is being checked and will appear here. The prices and licensing notes on this page already apply.

What ADU builders charge in Washington, DC

In Washington, DC, a garage conversion ADU typically costs $63,500 – $159,000. Remodeling labor in Washington, DC runs about 6% above the US median, which accounts for most of the difference from the same project elsewhere.

How to choose between them

  • Check the license yourself. Where District of Columbia or Washington, DC licenses this work, the licensing board's own lookup confirms a license number in a minute. Do it before you sign, not after.
  • Get three bids on the same scope. Written down, split into labor, materials, allowances and anything structural. Most people compare a total against a total and end up choosing between two different projects.
  • Ask what is not included. Permits, debris removal, fixture and finish allowances, and repairs after demolition are the four that turn a cheap bid into an average one.
  • Never pay a large deposit up front. A deposit to order materials and hold a start date is normal. Half the total before anyone shows up is not.

How this list is ordered

These are the firms from Google's results for "adu builders washington dc", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.

ADU builders in Washington, DC: common questions

Can I build an ADU on my lot?

It depends on your city and state. California, Oregon and Washington have state laws that make ADUs allowed on most single-family lots. Elsewhere it is set by local zoning, so check lot size, setback and owner-occupancy rules with your city first.