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The 2026 ADU Homeowner's Playbook, free.

A 27-page PDF covering process, costs, permits, and financing — plus monthly updates on what's changing in state ADU law.

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Independent guidance for U.S. homeowners building Accessory Dwelling Units.

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ADU builders · California

ADU builders in California

31 verified builders across 10 cities. Click into a city to see who serves that specific market.

Browse by city

Los Angeles6
Sacramento6
Berkeley5
San Diego5
San Jose3
Oakland2
San Francisco2
Pleasanton1
San Rafael1
Santa Clara1

California ADU permit info

Real permit fees, timelines, and ADU-specific rules for cities across California.

View California permit guide →