How Much Does an ADU Cost in San Diego?
A 2026 Price Guide for San Diego Homeowners QUICK ANSWER Most ADUs in San Diego cost between $180,000 and $460,000 to build in 2026, or roughly $300 to $500 per square foot for new detached construction. Garage conversions are the most affordable route, often starting around $100,000, while a fully custom detached ADU with premium […]