Independent local ADU guide
Local ADU rules and provider research
Start with official city rules, then compare county-level provider research. Local ADU rules are city-specific; designers, builders, engineers, and permit help usually work across nearby cities.
Provider search
Compare nearby ADU provider research
County pages group provider records by verification status, so discovery leads stay separate from source-backed official vendors.
- Review county providersCompare official, pending, and research-only records.
- Check city rulesConfirm size, parking, setbacks, and process.
- Verify before quotesOutreach, license review, and consent still come first.
Then compare 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, and quote routing stays disabled until outreach, active license review, and provider consent are complete.
Santa Clara County
Santa Clara ADU provider research
127 provider rows · 2 source-backed official vendors · 1 city rule hub
San Francisco County
San Francisco ADU provider research
84 provider rows · 0 source-backed official vendors · 1 city rule hub
San Mateo County
San Mateo ADU provider research
66 provider rows · 0 source-backed official vendors · 21 city rule hubs
Alameda County
Alameda ADU provider research
63 provider rows · 0 source-backed official vendors · rule pages pending
Start with official 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 Mateo County
Atherton
San Mateo County
Belmont
San Mateo County
Brisbane
San Mateo County
Burlingame
San Mateo County
Colma
San Mateo County
Daly City
San Mateo County
East Palo Alto
San Mateo County
Foster City
San Mateo County
Half Moon Bay
San Mateo County
Hillsborough
San Mateo County
Menlo Park
San Mateo County
Millbrae
San Mateo County
Pacifica
San Mateo County
Portola Valley
San Mateo County
Redwood City
San Mateo County
San Bruno
San Mateo County
San Carlos
San Mateo County
San Mateo
San Mateo County
San Mateo County
San Mateo County
South San Francisco
San Mateo County
Woodside
San Mateo County
Santa Clara County
How Local ADU Guide protects research quality
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.