Find ADU Rules
for Your City
Verified regulations, permit requirements, costs, and contractors for 100 California cities, sourced directly from official planning departments.
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Find Your City's ADU Rules
Click any city to see verified regulations, setbacks, permit requirements, and costs.
Why ADUByCity
Built for California Homeowners
California's ADU laws change constantly. We track every city's planning department so you don't have to, giving you accurate, up-to-date information before you invest a dollar.
- ✓Sourced from official municipal codes & planning departments
- ✓Regularly verified, not set-and-forget content
- ✓Clear freshness indicators on every regulation page
- ✓Free tools to estimate costs and ROI before you commit
The Process
From Research to Breaking Ground
We help at every stage of your ADU project.
Free Tools
Plan Your ADU with Confidence
Your ADU, beautifully realized.
ADU Cost Calculator
Estimate build costs, permit fees, and rental income potential based on your city, ADU type, and size.
Try the CalculatorROI Calculator
Calculate your annual return, payback period, and property value increase for adding an ADU.
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ADU Rules Change. Stay Ahead.
Get notified when your city's ADU rules change, plus guides on financing, permitting, and finding contractors.
The ADU regulation information on this site is compiled from publicly available municipal codes and planning department publications for general informational purposes only. It does not constitute legal, zoning, or construction advice. Regulations change frequently. Always verify current requirements with your local planning department before making decisions.