Personal Finance
How much does an ADU cost to build?
Quick Answer
A typical detached ADU in California costs $200K–$400K all-in ($250–$500 per sqft). Garage conversions run $80K–$150K. Modular ADUs from $150K–$250K turnkey. Rest-of-country averages 30–50% lower than CA.
Warren Team
Updated April 26, 2026
33
Warren Team
Updated April 26, 2026
33
Important Disclaimer:
The information provided is for educational purposes only and should not be considered as personalized financial advice. Warren is a registered investment advisor. Past performance does not guarantee future results. Please consult with a qualified financial advisor before making investment decisions.
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