Independent ADU directory

Search ADU provider research

Compare county-level records first because ADU firms usually serve nearby cities. Then use city pages to confirm official local rules before shortlisting anyone.

Compare county providers Browse city rules

Provider search

Search by county coverage

County pages group provider records by verification status, so discovery leads stay separate from source-backed official vendors.

300 provider rows2 official vendors298 research leads

Santa Clara127 rows San Francisco84 rows San Mateo66 rows Alameda63 rows

Review county providersCompare nearby source-backed provider research.
Check city rulesConfirm size, parking, setbacks, and process.
Verify before quotesOutreach, license review, and consent still come first.

Start with nearby help

County provider research

Provider research is grouped by county because most ADU firms serve several nearby cities. Listings stay labeled by verification status.

Santa Clara County

Santa Clara ADU provider research

127 provider rows · 2 source-backed official vendors · 1 city rule hub

125 research leadscounty-level comparison

San Francisco County

San Francisco ADU provider research

84 provider rows · 0 source-backed official vendors · 1 city rule hub

84 research leadscounty-level comparison

San Mateo County

San Mateo ADU provider research

66 provider rows · 0 source-backed official vendors · 21 city rule hubs

66 research leadscounty-level comparison

Alameda County

Alameda ADU provider research

63 provider rows · 0 source-backed official vendors · rule pages pending

63 research leadscounty-level comparison

Then confirm the local rules

City ADU rules

Rules are city-specific. The directory currently has 21 city rule hubs and 22 ready rule-led topic pages built around official sources.

San Francisco County

San Francisco

San Francisco County

San Jose

Santa Clara County

needs rule sourcecity rules

Verification policy

Permit contacts are discovery leads only, not verified providers. Official preapproved vendors can be cited from source data. Pending city-review candidates stay labeled as pending, and quote routing stays disabled until outreach, active license review, and provider consent are complete.