ADU Costs Range $120K to $280K in 2026
Accessory dwelling units in 2026 will range from $120,000 to $280,000 in construction costs, shaped by design choices, site specifics, and material selections. This guide dissects every expense category, outlines professional and DIY opportunities, and shares proven methods to reduce outlays while preserving value, empowering homeowners to achieve strong returns on their investment.



















