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Double Arch in Arches National Park, Utah, against a blue sky.

Tiny Homes in Utah: Laws, Rules and Communities

Updated November 4, 2026. Some laws may have changed since then. Confirm with your city or county before you buy land or a home.

The short answer

Yes, you can live in a tiny home full time in Utah, on a permanent foundation and where local zoning allows it. Utah has one building code for the whole state, and state law adopts the national tiny house appendix as part of it. State law also says a city or county cannot require a home larger than 1,000 square feet, with some exceptions. A tiny home on wheels is not a house under the code; a state health rule lets one into an RV park only with an RV-standard label and certification. Internal ADUs have been allowed in residential zones since 2021, and since October 1, 2026, cities of 10,000 or more people, and cities of 5,000 or more in larger counties, must allow a detached ADU on lots of 11,000 square feet or more. Before buying rural land, know that you need a water right to use well water. Utah has the 23rd highest cost of living of the 50 states, a flat 4.45 percent income tax, an effective property tax rate of 0.48 percent (3rd lowest), and homeowners insurance averaging $1,810 a year.

On this page. Quick facts, the rules in plain words, where to start, living in Utah, communities and common questions.

In Utah, the state sets the building code and your city or county applies it, along with zoning that decides where a small home can go. A tiny home on a permanent foundation, meaning it is anchored to a base built into the ground, like a concrete slab or piers, is a house under the state code. A tiny home on wheels, built on a trailer so it can be towed, is treated as a vehicle and falls under RV rules and local zoning.

This guide covers the state code and its tiny house appendix, the limit on minimum home sizes, homes on wheels and park models, manufactured and modular homes, Utah's two ADU laws, septic and water rights, and where to look for a community.

Quick facts

  • On a foundation (anchored to a base in the ground): a house under the Utah State Construction Code, which applies statewide.
  • Building code in force for homes: the 2021 International Residential Code with Utah changes. Commercial buildings moved to the 2024 code on July 1, 2026, but homes did not.
  • Tiny house appendix: adopted statewide by state law (Appendix AQ of the 2021 code).
  • Minimum house size: none in state law, and a city or county generally cannot require more than 1,000 square feet, not counting a garage.
  • On wheels (built on a trailer): a state health rule lets a tiny house on wheels into an RV park only with an RV-standard data plate and certification. Local zoning decides other locations.
  • Park models: model year 2015 and newer must be titled and registered with the Utah DMV.
  • ADUs (a second, smaller home on the same lot as a house): internal ADUs allowed in residential zones since 2021; detached ADUs required since October 1, 2026 on lots of 11,000 square feet or more in cities of 10,000 or more people and some smaller cities.
  • Water: you need a water right to use a well.

Can you live in a tiny home full time in Utah?

Yes, on a permanent foundation where zoning allows it. On wheels, it depends on where you put it.

  • On a foundation, a tiny home is a house. It has to meet the state code, which includes the tiny house appendix, and it needs sewer or an approved septic system and a legal water source.
  • On wheels, we found no state law that allows or bans living full time in one. Local zoning decides, and some cities say homes on wheels are not ADUs.
  • Cities and counties generally cannot require a home larger than 1,000 square feet, but local zoning still decides lot size and where homes can go.

The rules in plain words

Building code

Utah has one construction code for the whole state, the State Construction Code. For homes it adopts the 2021 International Residential Code with Utah changes. A 2026 law moved commercial buildings to the 2024 code on July 1, 2026 and kept homes on the 2021 code, and we found no date set for homes to move to 2024. Cities and counties generally cannot adopt stricter rules on subjects the state code already covers.

Design loads are set locally. Provo, for example, lists a 30 inch frost depth, and Iron County lists 30 to 48 inches depending on elevation, and seismic design categories along the Wasatch Front are high. Utah's code includes its own table of ground snow loads by location. Ask your building department for the figures for your site.

The tiny house appendix

The national code has an appendix with rules for tiny houses, called Appendix AQ in the 2021 code and Appendix BB in the 2024 code. It covers homes of 400 square feet or less, not counting lofts, and allows features like loft ladders and lower loft ceilings.

Utah law adopts "Appendix AQ of the 2021 edition of the International Residential Code" as part of the state code, so it applies statewide without a city having to opt in. If you would rather skip the loft, see tiny home layouts without a loft.

Minimum house size

Utah sets no statewide minimum house size. Its building design law lists "minimum square footage over 1,000 square feet, not including a garage" among the rules a city or county may not impose on one- and two-family homes. There are exceptions, including historic districts, flood and wildfire rules, development agreements and some older neighborhoods. A 2026 starter home bill that would have gone further did not pass.

Tiny homes on wheels and park models

A state health rule for RV parks defines a tiny house as "a dwelling that is 400 square feet or less in floor area, constructed on a chassis with wheels." A tiny house on wheels may be placed in an RV park only if it has a data plate showing it meets the NFPA 1192 or ANSI A119.5 standard and is certified by RVIA or inspected by a qualified third party.

Utah law defines a park model RV as temporary living quarters with no more than 400 square feet when set up. Park models from model year 2015 and newer must be titled and registered with the Utah DMV, and trailers over 750 pounds must be titled and registered too. A VIN inspection is needed the first time a unit is titled in Utah.

We found no state law that allows or bans living full time in an RV or a tiny home on wheels. That is a local zoning question, and Utah places differ:

  • Eagle Mountain says motor homes, travel trailers and "other housing units on wheels are not considered ADUs."
  • Millcreek has a mobile home and tiny home zone where tiny homes are allowed in mobile home parks, tiny home parks and tiny home subdivisions, with stays of at least 30 days.
  • Salt Lake County does not allow a detached ADU on a mobile or temporary foundation.

RV parks

The state RV park rule sets no length-of-stay limit, so each park and local zoning decide. Hurricane's city code, for example, says RV parks shall not be designed for use as permanent residences. Ask each park whether it allows year-round stays and whether your tiny home meets the RV park rule above.

Modular and manufactured homes

Since a 2024 law, the state Division of Facilities Construction and Management runs a statewide program for modular homes. Manufacturers need state approval, approved third-party agencies review plans and inspect in the factory, and finished units carry a certification decal. Contractors who install HUD-code manufactured homes must be licensed by the Division of Professional Licensing.

State law says "A manufactured home may not be excluded from any land use zone or area in which a single-family residence would be permitted." The home must be on a permanent foundation and meet local land use rules, building codes and any restrictive covenants.

ADU rules

Utah has two statewide ADU laws.

  • Internal ADUs, inside the footprint of the main home, have been a permitted use in residential zones of cities and counties since October 1, 2021. Cities and counties may still bar them on lots of 6,000 square feet or less, bar renting one out unless the owner lives in the home, require one extra parking space and bar rentals of less than 30 days. A city may also bar them in zoning districts that together cover up to a quarter of its residential land, except in subdivisions approved since October 1, 2021. An HOA cannot ban an internal ADU, or bar renting one, when it meets local zoning and building, health and fire codes.
  • Detached ADUs: since October 1, 2026, cities of 10,000 or more people, and cities of 5,000 or more in larger counties, must allow a detached ADU on any lot of 11,000 square feet or more with a single-family home. They cannot require a conditional use permit in a mainly residential zone, or more than two on-site parking spaces (one for an ADU under 650 square feet). The city may bar an ADU larger than the main home, bar rentals of less than 90 days and require the owner to live on the lot. This law does not cover towns, smaller cities or unincorporated county land.

Cities fill in the details:

  • Salt Lake City allows a detached ADU up to 1,000 square feet or the size of the main building, whichever is less, and requires owner occupancy on single-family lots.
  • Ogden allows a detached ADU of 300 to 800 square feet, with the owner living on the property.
  • St. George allows one ADU on any lot with a single-family home, and a second on lots of at least 11,000 square feet, with the owner living on the property and no short-term rentals.

Septic

Local health departments decide whether a lot can use septic, under the state rule. At least one soil pit is required, and the health department or the state rule sets the minimum lot size. In Cache Valley, for example, the Bear River Health Department requires at least 1 to 1.75 acres when the home uses a private well, depending on the soil, and 12,000 to 20,000 square feet with public water.

Water rights and wells

"You must own a water right to divert and use water in the State of Utah," according to the state Division of Water Rights. A well needs permission before it is drilled, and in areas closed to new water rights you have to buy all or part of an existing one. The division uses 0.45 acre-feet a year as the standard for indoor household use. Before you buy land without public water, check that a water right comes with it or can be bought.

Wildfire, earthquakes and radon

  • From January 1, 2027, Utah adopts the 2024 Wildland-Urban Interface Code for building in wildfire-prone areas, and a yearly fee on buildings in high-risk wildfire areas starts the same day. Check the state's wildfire risk map before you buy.
  • Much of the Wasatch Front sits in a high seismic design category, which affects foundations.
  • About 1 in 3 Utah homes tested had elevated radon, according to the state Department of Environmental Quality. Test kits are available through radon.utah.gov.

Where to start

  1. Not sure which office covers your land? USA.gov's local government finder points to a directory of Utah's counties and cities, with their websites and contacts.
  2. Call your city or county planning and zoning office. Ask about lot size, whether tiny homes and ADUs are allowed, and whether a tiny home on wheels can be lived in there. Get the answer in writing.
  3. Ask the building department for its design criteria (snow load, frost depth, seismic) and how it reviews homes under the tiny house appendix.
  4. If the land is not on sewer, ask the local health department about septic feasibility and minimum lot size before you buy.
  5. If the land has no public water, check the water right with the Division of Water Rights before you buy.
  6. For a park model or trailer, title and register it with the Utah DMV. For a modular home, look for the state certification decal; for a manufactured home, use a licensed installer.
  7. Once you live there, ask the county assessor whether you need to file a declaration to get the primary residential property tax exemption.
  8. Before buying land, check the flood map and the wildfire risk map.

Living in Utah

How Utah compares with the other 49 states on the things people weigh before a move. Figures as of November 2026.

  • Happiness score (WalletHub 2026). 66.45 out of 100, 3rd happiest
  • Cost of living (MERIC, Q2 2026; U.S. average is 100). 98.4, 23rd highest
  • State income tax. 4.45 percent flat (2026)
  • Property tax, effective rate on owner-occupied homes (Tax Foundation, 2024 data). 0.48 percent, 3rd lowest
  • Homeowners insurance, average a year with $400,000 in dwelling coverage (NerdWallet 2026; U.S. average $2,490). $1,810
  • Health care (U.S. News 2026). 18th
  • Education (U.S. News 2026). 6th
  • Average temperature, 1991 to 2020. 49.2 degrees F
  • Average precipitation, 1991 to 2020. 13.5 inches a year
  • Sunshine in Salt Lake City. 66 percent of daylight hours, 125 clear days a year
  • Outdoor recreation, share of the state economy (BEA 2024). 3.3 percent (U.S. 2.4 percent)
  • State parks. 46 state parks
  • People 65 and older (Census estimates, 2024). 12.4 percent (U.S. 18.0 percent)

Utah's cost of living is close to the national average, and its effective property tax rate is 0.48 percent. A primary residence gets a 45 percent reduction in taxable value, on up to one acre. The state income tax is a flat 4.45 percent for 2026. Homeowners insurance averages $1,810 a year with $400,000 in dwelling coverage, compared with a U.S. average of $2,490. U.S. News ranks Utah 6th in education and 18th in health care, WalletHub ranks it 3rd happiest, and it has the smallest share of residents 65 and older of any state.

Rankings mix many factors, and statewide averages hide big differences between regions. The Wasatch Front, the mountain valleys and southern Utah differ in weather, water and local rules, so look at the area where you plan to live.

Tiny home communities in Utah

We did not find a Utah tiny home community or RV park whose own website says it takes tiny homes for long-term living. Several directory listings for Utah turned out to be communities in other states. Rules, prices and openings change, so contact any community directly before you plan around it.

Two things to know while you look:

  • Millcreek's mobile home and tiny home zone allows tiny home parks and subdivisions, so ask the city what has been approved there.
  • A tiny house on wheels can go in a Utah RV park only if it carries an RV-standard data plate and certification, so ask the builder for those before you buy.

We will add communities here as we confirm them.

Tours we have filmed in Utah

We do not have a Utah tour to list here yet. When we do, it will be listed here. Our tours from other states are at Tiny Home Tours by State.

Get new tours and guides

Every other Friday we send real tours, results from our audience polls, and parking and legal lessons from people living tiny. Join the Tiny Home Tours newsletter.

Frequently asked questions

Is it legal to live in a tiny house in Utah?

Yes, on a permanent foundation, if it meets the state code and local zoning, with sewer or approved septic and a legal water source. The state code includes the tiny house appendix. For a tiny home on wheels, local zoning decides.

Does Utah use Appendix Q for tiny houses?

Yes. State law adopts Appendix AQ of the 2021 International Residential Code, the tiny house appendix, for the whole state.

Does Utah have a minimum house size?

Not in state law, and a city or county generally cannot require a home larger than 1,000 square feet, not counting a garage. Some exceptions apply, such as historic districts and flood or wildfire rules.

Can I put a tiny house in my backyard in Utah?

Since October 1, 2026, cities of 10,000 or more people, and cities of 5,000 or more in larger counties, must allow a detached ADU on lots of 11,000 square feet or more with a single-family home, and many cities allow them on smaller lots. It must meet the building code, so a home on wheels usually does not count. Ask your city.

Can I park a tiny home on wheels in a Utah RV park?

Only if it has a data plate showing it meets the NFPA 1192 or ANSI A119.5 standard, is certified by RVIA or inspected by a qualified third party, and the park agrees to take it. Each park and local zoning decide how long you can stay.

Do I need a water right for a tiny home in Utah?

If you use a well, yes. Utah requires a water right to divert and use water, and in closed areas you have to buy an existing right.

Sources

This page explains the rules in general terms and is not legal advice. Local rules vary. Confirm with your city or county before you buy land or a home.

Hero photo: Double Arch, Arches National Park, by Moriah Wolfe on Unsplash.

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