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How much does it cost to build an ADU?
Asked May 2, 2026 by a contractor in Handyman (Handyman Mod)
Thinking about adding an accessory dwelling unit for family. What's a realistic cost range and what drives it up?
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ADUs typically run $100,000–$300,000+ depending on size, whether it's a conversion (garage) or new build, and local permit/utility costs. Garage or basement conversions are usually the cheapest path. Design, foundation, and utility hookups drive most of the price. Start with a local pro who knows your city's ADU rules — they vary a lot.
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