California / Local ADU planning
Your ADU,
in Bay Area.
Peninsula, South Bay, San Francisco and East Bay planning resources.
The local starting point
Find the city that reviews your permit, then compare local rules, plan programs and provider evidence.
Start with the right permit office
Find your local guide.
Current city guides cover San Mateo County plus San Jose, Palo Alto, San Francisco, Oakland and Berkeley.
26 guides available
Make a useful shortlist
Explore ADU providers.
Builders & designers ↗
127 source-backed research records
Evidence and collection dates on each listingSan Francisco CountyBuilders & designers ↗
84 source-backed research records
Evidence and collection dates on each listingSan Mateo CountyBuilders & designers ↗
66 source-backed research records
Evidence and collection dates on each listingAlameda CountyBuilders & designers ↗
63 source-backed research records
Evidence and collection dates on each listingCompany websites and public permits provide different kinds of evidence. Listings are research starting points; confirm service area, credentials and availability directly.
Get ready for the first conversation
A clearer scope.
A more useful quote.
Build a budget with your own local estimates, then compare providers on design, site work, utilities and permit responsibilities.
Build your budget ↗Before you hire
Use the quote comparison checklist ↗California CSLB contractor lookup ↗Check the relevant professional board for architects and other separately licensed services.