A little more room. A lot more possibility.
Your ADU starts
with a local plan.
Make room for family, a little independence, or your next chapter. Find your city’s rules, understand the costs, and explore the people who can help.
More ways to live.
Can I build one?
Start with your city’s rules.
What should I budget?
See the whole project cost.
Who can help?
Explore local provider records.
From San Diego to Seattle
Find your place. Make a plan.
Bay Area
Peninsula, South Bay, San Francisco and East Bay planning resources.
City guides · Plans · ProvidersSan Diego
City and county permit paths, regional standard plans and local provider research.
City guides · Plans · ProvidersLos Angeles
Separate city and county plan catalogs, with local design and building resources.
City guides · Plans · ProvidersSacramento
Free city plan options and a practical route from feasibility to construction.
City guides · Plans · ProvidersSeattle
Attached ADUs, backyard cottages and the current Seattle permit process.
City guides · Plans · ProvidersPortland
Conversion and detached ADU guidance, with local design and construction firms.
City guides · Plans · ProvidersBefore the first quote
There’s more to a budget
than square footage.
Design, permits, site work, utilities, and a little breathing room. See how the pieces add up in a worksheet you can make your own.
Build your ADU budget ↗YOUR PROJECT, IN FIVE PARTS
Find the right kind of help
Explore providers near you.
Designers, builders and permit specialists often work across city lines. Start with your county.
ADU providers
Browse 127 research records
5 city-listed plan vendors · Evidence labels on every listingSan Francisco CountyADU providers
Browse 84 research records
Evidence labels on every listingSan Mateo CountyADU providers
Browse 66 research records
Evidence labels on every listingAlameda CountyADU providers
Browse 63 research records
Evidence labels on every listingKing CountyADU providers
Browse 4 research records
Evidence labels on every listingLos Angeles CountyADU providers
Browse 2 research records
Evidence labels on every listingMultnomah CountyADU providers
Browse 2 research records
Evidence labels on every listingSacramento CountyADU providers
Browse 3 research records
Evidence labels on every listingSan Diego CountyADU providers
Browse 189 research records
1 city-listed plan vendors · Evidence labels on every listingA listing is a starting point for your research. City plan approval and permit records do not establish contractor quality or a current license. How we research providers ↗
A good plan starts with good questions
Local knowledge, with the source attached.
We bring public ADU resources into one place and show where each fact comes from. Independent research, clear evidence labels, and a practical next step.
Get to know Local ADU Guide ↗