Garage-to-living-space conversion costs
Garage conversion calculator for turning garages into ADUs or living space. Covers permits, insulation, HVAC, plumbing, electrical, and finish options.
ADU permit cost estimates
Insulation and HVAC options
Plumbing and electrical
Finish level selection
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See All 40 ToolsOften, yes — California rules let most garage conversions become ADUs with simplified permitting. The calculator covers both finished living space and full ADU conversions.
Most garage-to-ADU conversions run $90K–$180K depending on whether you add a kitchen, bath, and separate utilities. The calculator gives a range tuned to your inputs.
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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.