ADU Costs: Build a Realistic Budget

Estimate the full cost of an accessory dwelling unit by separating design, permits, site work, utilities, construction, financing, contingency, and carrying costs. Use ranges as a starting point, then validate them with local bids.

What drives ADU cost?

• ADU size and type
• Site access, slope, demolition, and foundation work
• Utility connections and upgrades
• Local labor and material pricing
• Design, engineering, and permit fees
• Finish level and energy requirements

This hub will connect to detailed cost guides and the ADU cost estimator as they are published.