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ADU Building Costs Range $150K to $350K in 2025

Constructing an ADU in 2025 requires precise financial planning and regulatory awareness. Expenses span $100,000 for garage adaptations to $400,000 for independent cottages, driven by architectural choices, workforce rates, and jurisdictional charges. Mastering local rules, selecting reliable teams, and refining designs ensures strong returns, elevated home equity, and a seamless build experience.

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