Free Tool
ADU Cost Calculator
Estimate your total ADU build cost based on your state, unit type, square footage, and finish level. Costs are based on real contractor data and updated for 2026.
600 sq ft
200 sq ft1200 sq ft
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Fill in your details and click Estimate My Cost
Disclaimer: These estimates are for planning purposes only. Actual costs vary based on site conditions, contractor availability, material prices, and local requirements. Always get multiple bids from licensed contractors before committing to a budget.