ADU Building Costs: $120K to $350K in 2026
Planning an ADU or granny flat for 2026? Expect costs from 120000 dollars to 350000 dollars, timelines of 3 to 9 months, and advanced skill demands. This guide covers budgeting, permits, construction steps, safety essentials, and when to hire professionals to help homeowners build efficiently, stay compliant, and maximize long term property value.
Wilson BennettMay 26, 2026