What Is an ADU and Why San Diego Homeowners Are Building Them Right Now

If you've been hearing the term "ADU" around San Diego lately, you're not alone. Accessory Dwelling Units, also called granny flats, in-law suites, or backyard homes, are one of the fastest-growing housing solutions in California, and San Diego is leading the charge. But what exactly is an ADU, and is it right for your property?

What Is an ADU?

An ADU is a secondary residential unit built on the same lot as a primary home. It can be a detached structurhfe in your backyard, a garage conversion, an addition attached to your main home, or a basement/interior conversion. ADUs typically range from 400–1,200 sq. ft. and include a full kitchen, bathroom, and living space, making them fully functional homes.

Why San Diego Homeowners Are Building ADUs

San Diego's housing costs rank among the highest in the nation. ADUs offer a smart solution in several ways:

Rental Income: A backyard ADU can generate $1,500–$3,000/month in San Diego's rental market, directly offsetting your mortgage.

Multi-Generational Living: Keep aging parents or adult children close while maintaining everyone's privacy and independence.

Increased Property Value: ADUs can add 20–30% to your home's resale value, a significant return on investment in San Diego's competitive market.

California State Incentives: Recent laws (AB 68, SB 13) have dramatically streamlined the ADU permitting process statewide, making now one of the best times to build.

San Diego-Specific ADU Advantages

San Diego County has some of the most ADU-friendly regulations in the state. Reduced impact fees, relaxed setback requirements, and a fast-track permitting program through the City of San Diego make this an ideal time to move forward. Whether you're in North Park, Chula Vista, El Cajon, or Oceanside, ADU opportunities are available across the entire county.

Is an ADU Right for You?

If you own a home in San Diego County and have a lot that qualifies, an ADU could be one of the smartest financial decisions you make this year. Whether your goal is passive income, housing a family member, or boosting your property's long-term value, an ADU delivers on all fronts.

At HMS San Diego, we handle everything from design and permits to full construction, making the process simple and stress-free. Contact us today to schedule your free ADU property assessment and find out what's possible on your lot.