ADU Builder in Seattle — Seattle ADU Inc

Seattle ADU Inc is a licensed, design-build ADU builder in Seattle. We design, permit, and build DADUs (detached ADUs), backyard cottages, attached ADUs, and garage conversions across Seattle and the Puget Sound region. Fixed-price contracts, full SDCI permit handling, typical 4–8 month build timelines.

Call (206) 210-3411 for a free consultation, or explore our most-visited pages below. This site is fully interactive — please enable JavaScript for the best experience.

Popular pages

ADU Builder in Seattle — services, process & pricing
Seattle DADU & Backyard Cottage Construction
Seattle ADU Permits & SDCI Process
Seattle ADU Cost Breakdown
Seattle ADU Financing Options
Seattle Garage Conversion Services
All Construction Services
About Seattle ADU Inc
Contact & Free Consultation

Service areas

Seattle, Bellevue, Kirkland, Redmond, Bothell, Everett, Renton, Kent, Federal Way, Tacoma, and 30+ Puget Sound cities.