See what an ADU could cost, earn, and add to your property.
Estimate build cost, monthly rent, payback, and feasibility for any California property in minutes — with a transparent range, not a guess.
Where is your property?
California ADU costs and rents vary a lot by market. Use your city or a ZIP.
Four numbers every ADU homeowner should see.
Range depends on size, finish, and California market.
Market rent for a new 600–1,000 sq ft ADU.
After ~20% operating expense load.
Annual rent ÷ build cost. Pre-financing.
Answer five questions. Get a real answer.
Location, ADU type, size, finish, goal.
Your cost, rent, and payback start calculating live.
Your personalized range with all the assumptions behind it.
Optional free 15-minute call with a California ADU expert.
Browse California ADU costs by city.
Straight answers about California ADUs.
A typical detached ADU in California runs $275–$450 per sq ft before site-specific work, so an 800 sq ft unit usually lands between $220K and $360K. Garage conversions are cheaper ($175–$275/sq ft) and Bay Area markets are ~25% higher than Sacramento.
Model your ADU potential today.
A 2-minute calculator and a transparent, California-specific estimate. No contractor spam, no guesswork.