ADU Costs Hit $210K Average in 2026
In 2026, ADU construction costs average $210,000, with a range of $90,000 to $500,000 based on size, location, and features. This guide details influencing factors, cost-saving measures, typical timelines of 6 to 12 months, and ROI potential of 60% to 80%, helping you plan a smart addition for family living or income generation.




