ADU calculator · Utah
Three tools on one page. Build a home from components and see the cost from Arena's pricing engine. Match a plan to your goal and see what it rents for. Check whether your lot qualifies. No email required to see a result.
1 · ADU cost calculator
The ground level is always living. Add sleeping levels, a loft, a rooftop deck and a garage. Stairs come with a sleeping level, loft or deck. The build-up is the same one every proposal uses.
The build-up is the component price. Anything still open is marked request a quote, never a made-up number. Land, site work and the front door stay off the price until they are confirmed.
2 · Plan fit and rent
We match you to an Arena plan and show its average rent. The build price comes from the component build-up on your lot.
Enter your address. We check it against Utah's ADU law and your city's own rules. Three minutes, no email.
Every plan, its size and its rent, side by side. ADU cost in Utah →
What S.B. 284 changed on October 1, quoted from the bill. Utah ADU laws →
Every city we serve has its own page with its own numbers. Service areas →
Questions
Pick a footprint, then add sleeping levels, a loft, a rooftop deck and a garage. The calculator sends those components to Arena's pricing engine, the same one every proposal uses, and shows the build-up it returns. The website does not store a build price.
It is the component build-up for the home itself. Land, site work, the front door, and anything specific to your parcel — a long utility run, a retaining wall, a city impact fee — stay off it until an advisor confirms them against your address. Anything still open shows as request a quote, never a made-up number.
Arena's plans rent for roughly $1,400–$2,850 a month across the Wasatch Front, depending on the plan. The plan-fit calculator below shows the average rent for the plan that matches your goal.
Since October 1, 2026, Utah Code § 10-21-304 has made a detached ADU a permitted use on lots of 11,000 sq ft or more with a single-family home, in cities of 5,000 people or more. Many cities also allow ADUs on smaller lots. Enter your address in the lot check and Arena checks your parcel against your city's rules.
Financing runs 3–5 weeks, permitting 3–5 weeks, construction 6–8 weeks, and staging and finish 2 weeks.