How Long Does It Take to Build an ADU in Utah?
"How much?" is the first question people ask about an ADU. "How long?" is the second — and the honest answer is: it depends on two very different clocks. Get them straight and the timeline stops being a mystery.
The two clocks: permitting and construction
Every ADU project runs on two timelines that people constantly blur together:
Permitting — the paperwork clock
Zoning verification, a site plan, engineered building plans, and city review. On the Wasatch Front this is usually measured in weeks to a few months, depending on the city and how complete the submission is. A builder who's run your city's process before is the biggest accelerator here.
Construction — the build clock
Once permits are in hand, the actual building. This is where Arena is dramatically faster than a traditional stick build — because most of the work already happened in a factory.
Why steel goes up in weeks, not a year
A conventional stick-built home is cut and assembled board-by-board on site, exposed to weather and every subcontractor's schedule — which is why it drags across seasons. Arena homes are panelized cold-formed steel: walls, floors, and trusses are CAD-cut to the millimeter in a Salt Lake-area factory, delivered, and assembled on your lot. The shell sets in days, not months, and because steel doesn't warp or wait on drying time, the trades that follow stay on schedule.
A realistic Utah ADU timeline
For a typical Arena backyard home: a short design-and-approval phase to lock your plan and price, a permitting window set mostly by your city, then a construction phase measured in weeks for the build itself. The variables that move it are your city's review speed, your lot's site work, and financing timing — not the framing.
What speeds it up
A pre-engineered plan (no custom design cycle), a builder who handles permits in-house, and a fixed price that removes mid-project renegotiation. Arena does all three. Want a real schedule for your address? Have an advisor map your timeline or see what your lot supports.
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An Arena advisor runs your address, your goal, and your budget — and calls back with a fixed price and a floorplan that fits.
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