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    ContractorBest replyMay 6, 2026

    7 helpful votes

    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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