Is Building an ADU Worth It in San Diego County?
An ADU can bring rent, room for family, and more value to your property. It can also cost more and take longer than people expect. The gauge below helps you test your own numbers before you spend a dollar.
- An ADU can pay you and add value
- Your numbers decide whether it is worth it
- Check your city's rules first
What an ADU can do for you
An accessory dwelling unit is a second living space on your property. Owners use them for rental income, for aging parents, for adult kids, or for guests. A well planned ADU can also add to your home's value.
The four common types
- Detached: A separate small home in the backyard.
- Attached: Added onto the side or back of your home.
- Garage conversion: Turning the garage into living space.
- Junior ADU: A small unit built inside the existing home.
How to read the gauge
The score compares what you spend with what you earn in rent and gain in value over the years you plan to hold. A higher score means a stronger payoff. If you land low, try changing the type, the size, or the rent assumption.
Before you build
- Confirm your city's rules, fees, and timeline
- Check utilities, access, and parking needs
- Review HOA rules if you have one
- Price financing options early
- Get references and written bids from builders
California has made ADUs easier in many ways, but details differ by city and by lot. We help you check feasibility before you commit.
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Common questions
Do I need a permit for an ADU?
Yes. You will need permits from your city or county. The process and timeline vary by location, so confirm early.
Can I rent out an ADU?
In most cases yes, but rules about short term rentals and lease terms can vary. Check with your city and your lender.