Size limits, setbacks, parking, permit fees and costs for building an accessory dwelling unit (ADU) in 125 cities across 26 states — each page checked against the city’s own code, and dated.
Most read: Honolulu · Riverside · Tucson · Oakland · Sacramento · New York City
Free, no obligation. Always check licence and insurance before you hire.
Homeowners near you are pricing their ADU right now. We email you the ones in your area; you pay a flat fee only for a request you choose to take, and nothing when your area is quiet. No subscription, no contract.
Join the builder roster →See who’s waiting now on the homeowners-waiting board.
A 60-second check of your city’s rules against your lot.
Start the check →Construction, permits, design and utilities, by city and ADU type.
Estimate cost →Cities that publish ready-to-permit ADU plans, and what they save you.
See the plans →One-bedroom ADU rents in the cities we cover run from about $750 to $4,200 a month (typically $1,550–$2,000); each city page has its own figure.
Run the numbers →The number after each city is its ADU-friendliness score out of 10 (how we score). Type in the search box above to filter.
ADU Zoning Hub is not a builder, a lender or a manufacturer. It’s free for homeowners. How we make money: builders pay a flat fee for a homeowner’s request they choose to take, and some lender and prefab links earn us a commission. None of that changes what a city page says.