Proteus Homes builds custom ADUs across San Diego County — from Carlsbad to Chula Vista, Encinitas to El Cajon. Using our proprietary panelized construction system, we put up your ADU's structure in a single day and hand you the keys in under three months, managing design, permitting, and construction as your single point of contact the whole way through.

Every city in San Diego County sets its own rules for accessory dwelling units — zoning, setbacks, size limits, and permit requirements all vary by jurisdiction. Find your city below for a plain-English breakdown of what applies to your property, then book a free in-person site feasibility visit and we'll tell you exactly what's possible in your backyard.

Click on your city name for detailed information on ADU regulations, zoning, setbacks, and size requirements. 

*Note: This information is pulled from the city sites, and changes happen fast when it comes to ADU's. That a good thing as regulations have been easying! Please check for the city sites for updates.