43
Verified ADU builders listed
$150K–$400K
Typical detached ADU project cost
26,924
ADUs permitted in California in 2023
14
States with statewide ADU legalization
Featured builders
Every builder in this directory is an ADU specialist, verified against their own website — no general contractors, no filler listings.
Featured Design-Build
SA
San Diego's leading ADU design-build GC; transparent per-project pricing ($254K–$369K examples).
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Featured Design-Build
500+ ADUs built since 1984; design, permit & build under one roof; CSLB #1047699.
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Featured Design-Build
Full-service design-build with 10-year structural warranty; 100+ customers.
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Featured Design-Build
Austin ADU specialist since 2005; detached, attached, garage conversion, JADU.
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Featured Design-Build
Detached ADUs, garage apartments, guest suites; also serves Houston and Austin.
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Featured Design-Build
ADU/backyard-cottage design-build; Colorado HB24-1152 compliant; smart-home tech.
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Browse by state
Every listing is an ADU-focused business — dedicated design-build firms and prefab manufacturers, verified against their own websites.
California
19 builders — LA, San Diego, Sacramento, Bay Area and statewide prefab.
Texas
11 builders — Austin, Dallas–Fort Worth, San Antonio.
Colorado
8 builders — Denver metro and statewide prefab.
Oregon
3 builders — Portland.
Washington
1 builder — Seattle.
Arizona
1 builder — Phoenix.
Local ADU guides
Cost data and permit basics for the biggest ADU markets — start here before you call a builder.
- Los Angeles ADU builders, costs & permits
- San Diego ADU builders, costs & permits
- Sacramento ADU builders, costs & permits
- Bay Area ADU builders, costs & permits
- Austin ADU builders, costs & permits
- Dallas–Fort Worth ADU builders, costs & permits
- San Antonio ADU builders, costs & permits
- Denver ADU builders, costs & permits
- Portland ADU builders, costs & permits
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