Summit County · Service area

Can you build a backyard home in Park City?

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.

What changed here on October 1

Park City is the hardest market on this list — and the 90-day rule is why.

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

Park City ADU rules at a glance

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 still bringing this into line with the law that took effect 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

If your Park City plan depends on short-term rental income, check the tenancy rule before anything else — it decides the whole project.

Is my Park City lot 11,000 sq ft?

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.

Quoted on your Park City lot

Eight plans, from The Lookout at 784 sq ft to The Launchpad at 3,061 sq ft. A plan that is one component stack shows that price. The others say request a quote.

ADU calculator → · How the price works →

Can you build a backyard home in Park City?

Park City is the hardest market on this list — and the 90-day rule is why.

Park City ADU rules at a glance

If your Park City plan depends on short-term rental income, check the tenancy rule before anything else — it decides the whole project.

Is my Park City lot 11,000 sq ft?

Quoted on your Park City lot

Three places to start

The Lookout

The Encore

The Loft

There's still $2,200 a month hiding in your house.