Free tools · Updated 2026
What does an ADU actually cost to build?
Real construction costs, permit fees, and zoning rules for accessory dwelling units — itemized by city, calculated for your project.
ADU Cost Calculator
Itemized estimate by state, type, size, and finish level.
OPEN TOOL →Garage Conversion Calculator
Coming soon — conversion-specific costs and requirements.
COMING SOONRental Payback Calculator
Coming soon — break-even timeline if you rent your ADU.
COMING SOONCity guides