Find ADU builders near you
Compare local ADU builders, garage conversion contractors, and backyard cottage specialists — with city-specific cost guides and permit info.
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What is an ADU?
An accessory dwelling unit (ADU) is a self-contained home on the same lot as a primary residence — a backyard cottage, converted garage, basement apartment, or attached addition. California law makes ADUs legal on most residential lots, and homeowners build them for rental income, multigenerational living, and long-term property value.
ADUScouthelps you research your city's costs and permit rules, compare local contractors, and request quotes — free.
How it works
- 1. Research your city.
Local costs, permit rules, and timelines.
- 2. Compare contractors.
Browse profiles, specialties, and licenses.
- 3. Request quotes.
One form, matched to local ADU pros. Free.