Utah's SB 284, passed in 2026, requires cities with a population of 5,000 or more to allow detached accessory dwelling units (ADUs) on lots of at least 11,000 square feet that have a single-family home. Cities can still regulate design, setbacks, utilities and parking, so check your city's ADU code before planning a backyard unit.
What SB 284 changed
Before SB 284, many Utah cities allowed internal ADUs (such as basement apartments) but limited or banned detached ones. SB 284 requires cities with 5,000 or more residents to allow detached ADUs on qualifying lots:
- The lot is at least 11,000 square feet.
- The lot has a single-family home on it.
Provo, for example, announced that SB 284 expands detached ADU eligibility beyond the overlay zone where the city previously allowed them.
What your city still controls
SB 284 opens the door, but cities still write the building standards. Expect local rules on:
- Maximum ADU size and height
- Setbacks from property lines
- Utility connections (separate or shared water, sewer and power)
- Parking requirements
- Design and materials
HOA covenants are a separate question from city zoning; review your CC&Rs as well.
How to check whether your lot qualifies
- Find your lot size on your county parcel viewer or property tax record.
- Confirm your city's population is 5,000 or more (nearly every Wasatch Front city is).
- Read your city's ADU ordinance for size, setback and parking standards.
- Check HOA covenants if you have an HOA.
- Have a builder review utilities, access and the buildable area of your backyard.
Planning a detached ADU with Hamblin Homes
We build detached ADUs, garages and additions along the Wasatch Front, and we can review your lot against your city's code before you spend money on plans. See our ADU and additions services or request a lot review.
This guide is general information, not legal advice. Confirm current requirements with your city's planning department.