ADU Cost Guide for San Mateo County in 2026

ADU cost guide San Mateo County 2026 — garage conversion accessory dwelling unit completed by Genuine Kitchen and Bath in San Carlos

ADU construction costs in San Mateo County in 2026 vary significantly by project type — and the difference between a garage conversion and a new detached ADU is not just a matter of price. It is a difference in scope, timeline, and what your site can support. Here are the real numbers, broken down by […]