What to Know Before Building anADU in Marin County
Accessory Dwelling Units (ADUs) have become one of California’s most popular home upgrades — offering flexibility, family space, or rental income. But before you start, it’s important to understand the basics.
1. Zoning & Size Limits
In most areas of Marin County, detached ADUs can be up to 1,200 square feet. Many cities allow smaller “Junior ADUs” (JADUs) under 500 sq. ft., often converted from existing space.
2. Design & Permitting
ADUs must comply with California’s state standards — including setbacks, energy efficiency, and accessibility. Working with an experienced contractor who understands local codes can save months of delay.
3. Long-Term Value
An ADU adds not only living space but also long-term equity. Whether for family or rental income, it’s one of the most cost-effective investments you can make.
At Pelayo Built, we manage the entire ADU process — from concept to final inspection — so homeowners can enjoy a streamlined experience and lasting results.
