Are ADUs legal in Utah?
Yes — Utah permits ADUs by-right statewide per HB 82 (2021), HB 306 (2023). Every qualifying municipality must allow at least one ADU pathway on eligible single-family lots.
What are the size limits on an ADU in Utah?
Utah permits ADUs up to approximately 1000 square feet per HB 82 (2021), HB 306 (2023). Individual municipalities may set lower caps; verify with your city or county planning department before ordering.
Do I need a permit for an ADU in Utah?
Yes — every ADU in Utah requires a building permit issued by the city or county. The permit process typically runs 40-110 days depending on jurisdiction, complexity, and whether discretionary review is triggered.
Can I rent out my ADU in Utah?
Yes — long-term rental of an ADU is generally permitted in Utah. Short-term rental (Airbnb / VRBO under 30 days) is subject to municipal registration and may require additional permits.
Does Utah require owner-occupancy on the primary residence when I have an ADU?
No — Utah does not require owner-occupancy under state statute per HB 82 (2021), HB 306 (2023). Local ordinances may still add owner-occupancy requirements in specific cities.
What zoning districts allow ADUs in Utah?
Most Utah municipalities permit ADUs in single-family residential zones (R-1, R-2 equivalent). Utah HB 82 (2021) permitted internal ADUs by-right statewide. HB 306 (2023) expanded to detached ADUs in cities over 25,000 population. Consult your city zoning code for the specific district table.
How long does an ADU permit take in Utah?
Typical ADU permit timelines in Utah run 40-110 days from application to approval. Fast-permitting counties can move in under 30 days; metro-core jurisdictions with discretionary review can extend to 150+ days.
Are there setback requirements for an ADU in Utah?
Yes — most Utah municipalities apply the same setback requirements to ADUs that apply to the primary structure (typically 5-10 feet rear and side, 15-25 feet front). Some cities apply reduced setbacks specifically for detached ADUs. Verify with your city zoning code.
Can I finance an ADU purchase in Utah?
Yes — several financing pathways cover ADU purchases in Utah: Fannie Mae HomeStyle Renovation, FHA 203(k), construction-to-perm loans, HELOC on the primary residence, and cash. Check with modular-friendly lenders like 21st Mortgage, Cascade Financial, and Triad Financial for the Utah-specific product.
What's the difference between an ADU and a JADU in Utah?
The JADU (Junior ADU) category originated in California and is not a distinct legal category in Utah. Most Utah municipalities regulate internal conversions and detached units under a single ADU/accessory apartment definition.