Decks
Do I need a permit to build a deck in Utah?
Short answer
Usually yes. Utah follows the residential code, so a deck attached to the house or more than 30 inches above the ground needs a permit. Small, freestanding, ground-level decks under 200 square feet are often exempt. Your city makes the final call, and a hot tub on the deck raises the stakes either way.
What is the 30-inch rule?
Building codes draw a line at 30 inches of height above the ground. Below it, a fall is unlikely to hurt you badly, so the rules relax. Above it, the deck needs a permit, engineered-style framing, and a guardrail. A guardrail is the barrier around the deck edge that keeps people from falling off.
Measure from the lowest point of the ground within a few feet of the deck, not the highest. A deck that is 20 inches tall on one side and 40 inches tall where the yard slopes away is a 40-inch deck in the eyes of an inspector.
When is a deck exempt from a permit?
The common exemption, which most Utah cities adopt from the residential code, requires all of these at once:
- Freestanding, meaning not attached to the house
- Under 200 square feet
- Floor no more than 30 inches above the ground
- Not serving the home's required exit door
Miss any one of them and you are back in permit territory. And even an exempt deck must still follow zoning rules, like setbacks. A setback is the required distance between a structure and your property line.
Does a hot tub change the permit picture?
Yes, in two ways. First, weight. A filled hot tub with people in it can weigh several tons over a small footprint. A standard deck is not framed for that. The framing under a tub needs to be designed for the real load, which typically means closer joist spacing, more beams, and more footings. Footings are the concrete pads that carry the deck's weight into the ground.
Second, the tub itself brings electrical requirements. Hot tubs need a dedicated circuit, a shutoff within sight, and inspection. That is its own permit conversation even when the deck is small.
This is exactly the kind of deck my company builds, so I will say it plainly: a hot tub deck is a structure, not a platform. Build it like one.
What happens if I build without a permit?
The same story as any unpermitted work. No inspection of the framing that holds your family up. Insurance questions if something fails. Problems at sale when the buyer's inspector asks for the permit history. And cities can make you tear open or remove work to prove it is safe.
The permit on a typical deck costs a small fraction of the project. It is the cheapest structural insurance you can buy.
Who handles the permit if I hire it out?
Your contractor should, start to finish: drawings, application, fees, and inspections. That is how I run deck projects in Washington County. If you are sketching a deck, or a hot tub is on its way and the platform question just got real, tell me what you are planning. I will tell you what the city will want before you commit to anything.