Detached ADUs · Utah

The ADU builder that tells you the price first.

A detached accessory dwelling unit is a complete second home in your backyard — your parents' place, your kid's first apartment, or a permitted long-term rental. Arena builds them from cold-formed steel and quotes them from the component build-up. Licensed general contractors handle permits and engineering.

Takes about 3 minutes. No email required to see your result.

01

Permitted by right from October 1

Utah S.B. 284 makes a detached ADU a permitted use on most lots of 11,000 sq ft or more. No conditional use permit, no hearing. How the law works →

02

One build-up

The component build-up — design, engineering, permits, the foundation, the Arena Standard and finishes. Land, the front door, and parcel-specific site work are quoted separately. How the price works →

03

One dedicated crew

Licensed Utah GCs on Arena's own team, foundation to finish. Panels CAD-cut in a Salt Lake-area factory, craned in and assembled on site — not a year of strangers in your side yard.

04

Built to rent from day one

Real bedrooms, real baths, a rooftop deck with solar. It rents like a two-bedroom apartment, not a tiny home. Run the rent math →

ADU plans

Start with one of these three.

The Lookout, the Encore, and the Loft. Each one is a component stack, and the price on the card is that build-up.

Rental-readyThe Lookout — dollhouse render of the single-story 2 bed layout

The Lookout

AH-01 · 672 sq ft · 2 bed · 1.5 bath · 1 story + roof deck
Request a quoteComponent build-up
$1,400Est. rent / mo
Step-freeThe Encore — single-story home exterior

The Encore

AH-02 · 864 sq ft · 2 bed · 1.5 bath · 1 story, no stairs
Request a quoteComponent build-up
Main + loftThe Loft — front elevation drawing

The Loft

AH-03 · 874 sq ft · 3 bed · 2.5 bath · main + loft
Request a quoteComponent build-up
$1,650Est. rent / mo

See all eight plans →

What's in the number

Every part, priced separately.

A home is a footprint, a living level, any sleeping levels, a loft, a rooftop deck and a garage. Stairs come with a sleeping level, loft or deck. Build your own prices that mix from the same engine every proposal uses.

Build your own — see the price move →

Three ways families use one

01

For your parents

Close enough to check on, far enough that everyone keeps their own front door. Single-story plans, no stairs, and a fraction of what assisted living costs each month.

02

For your kids

A real place to live while they save a deposit — on the property you already own, instead of a Sugar House one-bedroom that costs more than they clear in a week.

03

For income

A long-term tenant in a legal, permitted unit. Most owners finance against equity they already have and let the rent carry the payment. How financing works →

Where we build

Twenty cities, each with its own rules — and its own page.

Salt Lake CityDraperSandySouth JordanWest JordanHerrimanRivertonMurrayHolladayCottonwood HeightsLehiAmerican ForkProvoOremPleasant GrovePark CityBountifulLaytonOgdenSt. George

Questions

ADUs in Utah, answered plainly

What is an ADU?

An accessory dwelling unit is a second, self-contained home on the same lot as a single-family house — its own kitchen, bath, bedroom and entrance. Arena builds detached ADUs: a complete steel-framed backyard home. The Lookout is 672 square feet. The largest plan in the guide is 2,949.

Who builds Arena ADUs?

Licensed Utah general contractors on Arena's own dedicated crew — the same team from foundation to finish, not a rotating cast of subcontractors. Arena's crews have completed internal basement ADUs across the Wasatch Front and have detached units in permitting now; the first Arena model home breaks ground in Draper in September 2026.

How long does an Arena ADU take?

Financing runs 3–5 weeks, permitting 3–5 weeks, construction 6–8 weeks, and staging and finish 2 weeks. Steel panels are CAD-cut in a Salt Lake-area factory while the site is prepared, then assembled on site.

Can I rent it out?

Yes. Utah's new law lets cities require a 90-day minimum tenancy, so an ADU is a long-term rental, not a nightly listing. Arena plans rent for roughly $1,400–$2,850 a month across the Wasatch Front depending on the plan.

Does my lot qualify?

From October 1, 2026, a detached ADU is a permitted use on most lots of 11,000 sq ft or more in Utah cities of 5,000 people or more. Smaller lots often qualify under existing city rules. Enter your address and Arena checks the parcel for you.