
How Long Does It Take To Build An ADU?
Key Takeaways Building an ADU typically takes 12 to 18 months, with each phase—from planning and design to site preparation, construction, and finishing—requiring careful coordination.
Our resources are built around experience, not theory. With more than 40 years serving Bay Area homes, Mares & Dow Construction & Skylights shares insight that reflects how quality construction is planned, built, and maintained. Every article supports informed decisions through craftsmanship, materials, and long-term performance.

Key Takeaways Building an ADU typically takes 12 to 18 months, with each phase—from planning and design to site preparation, construction, and finishing—requiring careful coordination.

Key Takeaways Compare the total project costs, including construction, utility connections, site preparation, and interior finishes, before deciding between a garage conversion and a detached

Key Takeaways For the vast majority of projects, it will take you between 6 and 12 months to build an ADU, or accessory dwelling unit.

Key Takeaways Garage conversion vs. Detached ADU — they both add to your living space and increase your property value, but each is the ideal




