Can you add an ADU? Find out in a minute.
Type your address. You'll see how many ADUs and junior ADUs your lot allows, how big and tall they can be, the setbacks and parking, what the permits cost and what it could rent for, each beside the rule it comes from.
What your lot allows
- How many ADUs and junior ADUs, including the second detached ADU state law adds on January 1, 2027
- The largest size and height for each kind: inside the house, attached, detached
- Side, rear and street setbacks, and when a small ADU can go in the front yard
- Whether parking is required, and why not near transit
What it would cost and earn
- City permit fees for the size you plan, from the City's own fee schedule
- A building cost estimate you can change
- A rent estimate and the yield on what you'd spend
- What changes if you build inside the house instead of new
What to watch for
- Flags for fire hazard zones, the coastal zone, historic districts and steep slopes
- The building code basics for the kind of ADU you pick: sprinklers, fire-rated walls, escape windows
- A full report to download and share with a designer or lender, free for your email
- A button to ask local ADU builders for quotes when you're ready
The rule, not a summary of it.
Small ADUs get special room in the code. The report tells you when yours qualifies and quotes the sentence that allows it.
“one attached or detached ADU with a gross floor area of 800 square feet or less may be permitted”
Your lot, checked against the code.
It's free and takes about a minute. No account needed for the answer.