Summit County · Service area
Park City is the hardest market on this list — and the 90-day rule is why.
Being amended now The state floor is what you can rely on today.
Takes about 3 minutes. No email required to see your result.
Park City's constraint isn't lot size, it's what you may do with the unit. State law lets a city prohibit renting a detached ADU for less than 90 consecutive days, which rules out the nightly-rental economics many Park City owners would assume. Steep-slope and sensitive-lands review adds real cost here that flat Wasatch Front lots don't carry.
“A specified municipality shall adopt a land use regulation that permits a detached accessory dwelling unit on any lot or parcel that is 11,000 square feet or larger…” — S.B. 284, Enrolled Copy, Utah Code § 10-21-304, effective October 1, 2026.
The numbers that decide your project
| Rule | Park City — Park City Land Management Code — confirm current version |
|---|---|
| Minimum tenancy | A city may bar rentals under 90 consecutive days. Plan this as a long-term rental or family unit, not a nightly listing. state law |
| Status | Ordinance being reviewed against § 10-21-304 ahead of October 1. moving now |
| Site constraints | Steep slope, sensitive lands and snow-load requirements materially affect cost and feasibility. Arena scopes these before quoting. moving now |
| State floor from Oct 1 | Detached ADU permitted on lots ≥ 11,000 sq ft in a primarily residential zone. state law |
state law Quoted from the enrolled copy of S.B. 284 — primary source, verified.
confirm with city From the city's published ADU material or council reporting — Arena confirms at the planning counter before design.
moving now The city is actively amending this ahead of October 1, 2026. Treat as a moving target.
We would rather show you the gap than guess. Arena is a builder, not a law firm — confirm your parcel with Park City before you sign anything.
What that means on your lot
That single number decides whether the new state law applies to you. Enter your address above — we'll tell you which rule you fall under and which plans fit, in about three minutes.
Arena publishes every price — seven plans from The Lookout at 735 sq ft to The Launchpad at 2,541 sq ft. One team owns design, engineering, permitting and construction.
From $128,625 · see every price →
Plans that fit a Park City backyard
Permitting queues in Park City will not get shorter after October 1.