How Much Does an ADU Cost in Utah? How Arena Prices a Backyard Home
Ask three Utah contractors what an ADU costs and you'll get three shrugs and a "well, it depends." It does depend — on the plan and on your lot — so instead of a price list, here's exactly how Arena prices a backyard home, and how to get the real number for yours.
The short answer: it's built up from 13 categories
Arena doesn't quote a rule-of-thumb figure. Every Arena price, for every plan, is built up from the same 13 categories, each priced from what your home actually contains and what your lot needs. The component build-up is the number: design, permits, the foundation, the steel frame, and the Arena Standard. Site work, the front door, and the land are quoted separately.
Permitting, engineering and planning
Your plan set, structural engineering for Utah's seismic code, the zoning check and every permit carried through your city.
Site work, foundation and utility laterals
The foundation is in the build-up. Site work and the utility runs are quoted on your lot. They stay off the number until they are confirmed.
Exterior finishes and basic landscaping
The finished exterior and the ground around the home put back in order.
Complete structure, walls, floors and roofing
Kinetic Steel USA cold-formed steel framing; exterior walls of Kinetic Steel HFW-40 insulated metal panels (insulation, weather barrier and finish in one panel); an MgO structural subfloor on upper floors; and Kinetic insulated steel roof panels. See the whole engineered spec.
Mechanical, electrical and plumbing
All-electric heating and cooling, the electrical service and the plumbing throughout.
Kitchen
Cabinets, counters, sink and fixtures, sized to the plan.
Living spaces
Finishes for the living and dining areas.
Bathrooms
Each bathroom, priced for what it actually holds.
Bedrooms
Each bedroom, with its closet and doors.
Laundry
The laundry space and its hookups.
Stairs, flat roof, garage
Stairs on multi-level plans, the flat roof under a rooftop deck, and any garage — priced only where your plan has them.
Appliances, small systems and finishes
Appliances and the smaller systems and finishes that make the home move-in ready.
Construction management, inspections and contingency
The team that runs the build, every inspection through final sign-off, and a contingency held for the unexpected.
To see those 13 lines for your own lot, request a quote, or compose a home in Build Your Own.
What moves the number
The biggest swing between two identical plans is usually category 2: how far the utilities run, what the soil and slope ask of the foundation, and what the lot needs before we can build. After that it is the plan itself — how many bathrooms and bedrooms it has, and whether it has stairs, a rooftop deck or a garage. That is why a number quoted before anyone has looked at your lot is a guess.
Why "it depends" usually means change orders — and why it doesn't here
Traditional ADU quotes float because stick-built construction passes every surprise through to you: lumber repricing mid-build, subcontractor overruns, weather damage to exposed framing, and the classic 10–20% "contingency" that always gets spent. Since 2020, construction materials have run roughly 40% more expensive and borrowed money costs about twice as much — which is exactly why open-ended quotes have gotten scarier.
Arena's homes are panelized cold-formed steel, cut to the millimeter in a factory and assembled on site in weeks. Factory precision is what makes a locked price possible: when the parts can't warp, rot, or get re-cut on site, the labor doesn't balloon — so the quote doesn't either.
The other half of the math: what it pays back
Wasatch Front comparables put Arena plans between $1,400 and $2,850 a month in long-term rent. For the full rent-vs-payment math, read the Utah house-hacking playbook — or request a quote and weigh your real build price against the rent your plan supports.
Get your number
An Arena advisor runs your address, your goal, and your budget — and calls back with the component build-up and a floorplan that fits. Site work is quoted on the lot.
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