The 10 ADU builders from Google's results for Seattle, Washington, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
Licensing in Washington. Washington contractors must register with Labor & Industries (L&I), which also shows their bond and insurance.
on GoogleSeattle, WA
Levite Construction is a design-build remodeler with offices in Seattle and Redmond, working across King, Snohomish and Pierce counties. It handles kitchens, baths, additions, ADUs, custom homes and whole-home renovations from design through construction.
(425) 998-8958 5608 17th Ave NW Ste 1490, Seattle, WA 98107
on GoogleSeattle, WA
Seattle ADU Inc is a design-build contractor that designs, permits and builds DADUs, backyard cottages and garage conversions around Puget Sound. It also takes on other residential construction, including home additions and bathroom remodels.
(425) 699-6096 509 Olive Wy, Seattle, WA 98101
on GoogleAustin, TX
LFM Remodeling runs an Austin showroom and also builds ADUs, detached units and backyard cottages around Seattle. Its residential work covers kitchens, bathrooms, whole-home renovations, additions, garage and attic conversions, decks, patios and sunrooms, and it also remodels retail and restaurant spaces.
(512) 277-6108 2307 Thornton Rd #103, Austin, TX 78704
on GoogleRedmond, WA
Emerald City Construction builds detached backyard cottages and attached or interior accessory dwelling units in Seattle and on the Eastside. Based in Redmond, the company also finishes basements as part of its renovation work.
(425) 502-8174 2571 152nd Ave NE, Redmond, WA 98052
on GoogleEverett, WA
Serving the greater Seattle area from Everett, this company remodels kitchens, supplying fixtures, materials and labor as one package. Projects begin with an in-home design consultation covering goals and budget, and the firm also builds accessory dwelling units.
(425) 521-7916 1010 SE Everett Mall Way Ste 102, Everett, WA 98208
on GoogleSeattle
The Backyard ADU offers turnkey accessory dwelling unit development in Seattle.
Seattle
King County ADU Builders works on accessory dwelling units around Seattle. Services include detached backyard units, garage conversions, attached ADUs built as home additions and smaller junior ADUs, giving homeowners several ways to add a second living space on a residential lot.
Seattle
Blue Lake Construction designs and builds accessory dwelling units in Seattle, Bellevue, Burien, Fall City and other parts of King County. Plans, permits and construction are bundled into a single turnkey contract.
Seattle
AmyWorks builds ADUs in the greater Seattle area, creating separate living space for family, guests or rental income on an existing property. Beyond accessory units, the company remodels kitchens and bathrooms and converts garages and basements into finished space.
Seattle
Wisechoice GC is an ADU builder working in the Seattle area.
In Seattle, a garage conversion ADU typically costs $68,000 – $169,500. Remodeling labor in Seattle runs about 13% above the US median, which accounts for most of the difference from the same project elsewhere.
These are the firms from Google's results for "adu builders seattle", 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.
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.