ADU and granny flat cost estimates
ADU calculator covering garage conversions, detached units, and additions. Pricing from $220-400/sqft with permit costs, utility connections, and finish options.
Garage conversion, detached, addition
$220-400/sqft ranges
Permit cost estimates
Utility connection options
Lead capture gate
Works on any website
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See All 40 ToolsYes — the planning-grade range includes typical permit fees, design, structural review, and standard utility connections for a San Diego County ADU build.
Yes. Pick build type and the estimate adjusts: detached new builds typically run $200K–$450K, garage conversions $90K–$180K depending on size and finish.
Yes. After you sign up, TradeCalcs gives you a copy-paste embed snippet that drops the Adu calculator into any site (WordPress, Wix, Squarespace, GoHighLevel, custom HTML). Lead capture is optional and built in.
It's a planning-grade rough range — typically within 15–25% of a contractor bid for a similar scope in San Diego. For a firm number you'll still want a site visit and a real proposal.