ADU Cost by City: 2026 Comparison
Average all-in build cost for a detached accessory dwelling unit across 11 major US metros. Watch the bars fill, then see how your city ranks.
National average ADU build
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range $220,000–$400,000
🟠 most expensive metro·🟣 all others·tap a city for its full cost guide
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Data & method: Figures are the average all-in build cost (design, permits, and construction; excludes land) from ADUCosts 2026 city cost guides. Tap any city above for its full local breakdown and range.
Disclaimer: ADU costs vary widely by lot, size, finishes, and contractor. These are estimates for general guidance — not a quote or financial advice. Confirm with local builders before budgeting.
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