Planning tool
California ADU Cost Estimator
See what it may cost to build an ADU on your property. This produces a planning range built from documented, dated cost assumptions — not a quote. Only a licensed professional reviewing your property can price your project.
Preliminary planning estimate
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This is a planning estimate. It is not a contractor bid, a guaranteed price, a financing approval, or an appraisal, and it excludes jurisdiction-specific amounts we cannot verify. Get written proposals from licensed professionals before making financial decisions.
Estimate history
Sign in to save estimates and see how your project evolves over time.