Live Tremonton listings, filtered
Casita and ADU homes in Tremonton
Tremonton homes for sale with a second place to live, shown live from the MLS whichever brokerage lists them. Under the listings: the kinds of second space, what Tremonton's code says, and a quick check for a real ADU.
Check the permit first.
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Land, views and luxury
The newest Tremonton casita and ADU homes
Listing information comes from the Wasatch Front Regional Multiple Listing Service and is deemed reliable but not guaranteed.
Four kinds
Which kind of second space is it?
The words casita and ADU on a listing can mean four different things. Pick one to see what it can be and what to look at.
What it can beA legal ADU, if it has a permit
What to look at
- Inside the house. A basement or mother-in-law apartment is a permitted use in the single-family zones. The owner applies to the city for an ADU permit.
- Water below ground. Builders here found water close to the surface in 1912, and a drainage system went in the next year. Ask about sump pumps and past water.
- The permit. A unit is a legal ADU only if the city issued a permit for it. Ask to see the records.
What it can beAn ADU, if it has a kitchen and a permit
What to look at
- The setup. A bedroom, a bath and a door of its own, built inside the home or added onto it.
- Kitchen or kitchenette. A full kitchen can make it an ADU. A sink and a microwave make it a guest suite, not a second home.
- Ask first. Before you count on a unit, ask Tremonton's Community Development office whether the lot can take an ADU.
What it can beAsk about the plan and the lot
What to look at
- A flat town. Most of Tremonton sits near 4,300 feet. A lower level that opens to the yard needs a lot that slopes.
- In a new home. Ask the builder whether the plan has a suite, and whether the plat allows one.
- Plan it early. Doors, pipes and walls are simplest to place before the foundation is poured.
What it can beA permitted use; check the lot
What to look at
- A cottage out back. Tremonton's code allows a detached unit in the single-family zones. One lot can hold a unit inside the house plus a detached one.
- The size. It must be at least 300 square feet, smaller than the main house, and no more than 30 percent of the back yard.
- Read the listing. A shed or a shop in the yard is not a legal home unless the city issued an ADU permit for it.
The guide
What to know before you buy
The local read, the city rules, two spaces, one lot, the cost, before you tour and how it works
The local read
What casita and ADU mean in Tremonton
In shortThe homes on this page have a second place to live. Tremonton's city code allows a unit inside the house and a unit in the yard, with a permit and the owner living there.
First, two words, because listings mix them up. A casita is a design idea: a small, partly separate space, often a bedroom and a bath with a door of its own. An ADU is the legal version. The letters stand for accessory dwelling unit: a second home on the same lot, usually with its own kitchen, that the city has approved.
Here is how Tremonton sees it. Both kinds are permitted uses in the five single-family zones. A city staff member, the zoning administrator, decides on the permit. A lot can hold one of each.
Utah law points the same way. The card called Utah law, below, says what the state rule adds, and how it fits the city code.
Homes with a legal second space are listed one at a time, and the listing words are loose. Ask your partner agent to read the remarks and the permit with you, and ask the city if anything is unclear.
Casita or guest suite
Often what a listing says- A bedroom and a bath, often behind its own door
- A kitchenette at most, not a full kitchen
- Room of your own from day one
ADU
Check with the city- A second home on the lot, usually with its own kitchen
- Approved with an ADU permit from the city
- An owner who lives on site
The city rules
What Tremonton allows
This is what the city code says as of October 2026, not a promise. Rules change, so confirm them with Tremonton's Community Development office before you plan around a second space.
A permitted use
In Tremonton, a basement apartment or a backyard cottage is a permitted use in the single-family zones. You apply to the city for an ADU permit, and the zoning administrator decides. A lot can have one unit inside the house and one detached unit.
A detached unit
A detached unit must be at least 300 square feet, smaller than the main house, and no more than 30 percent of the back yard. It meets the same setbacks as any accessory building in that zone. A setback is how far a building must sit from the lot line.
The owner lives there
The owner has to live on the property, in the house or the ADU, at least eight months a year. The unit cannot be sold off separately.
Parking
Plan one off-street space for the unit, two if it has two or more bedrooms, on a hard surface and separate from the home's driveway.
Two spaces, one lot
Living with a second space
A second home on the lot needs a little planning. Check these four before you tour.
Water, sewer and power
The unit hooks to city water and sewer through the same meter and sewer line as the house. Gas and power can have their own meters.
City sewer
The code asks every ADU to connect to the city's water and sewer. Some areas inside the city have no sewer and use septic tanks, so a lot on septic may not qualify. Ask the city.
Utah law
A state law in force since October 1, 2026, also requires cities like Tremonton to allow a detached unit on lots of 11,000 square feet or more, without a conditional use permit. Tremonton's code already allows one in every single-family zone.
Cars in winter
A second home often brings another car. The city bans street parking from midnight to 6 a.m. in December, January and February, so count the driveway and the unit's own space.
Sources: Tremonton city code, accessory dwelling unit chapter and use table (Municode, July 2026); Utah Code 10-21-304; Tremonton building permit sheet; Ordinance 15-213.
The cost
What a second space costs in Tremonton
No table I trust compares Tremonton homes with a second space to homes without one, so I will not guess at a gap. Each home prices on its own size, lot, age and finish.
Census survey data (ACS 2020 to 2024) puts the typical Tremonton home value at about $364,900. Owners estimate that figure, and it is not a sale price. The city does not charge impact fees on an ADU. Those are one-time charges on new building. The city's 2026 fee schedule lists $75 for a unit inside the house and $150 for a detached unit.
Shop by budget, or start from every home in a price range
Before you tour
The second space checklist
Take this on every showing. Tick each line as you check it. Your ticks stay on this device.
How it works
How we find you the right second space
I work from Southern Utah, so a Tremonton search runs through a partner agent. This is a small group of homes with loose labels.
Start with what the space is for
A full ADU, a basement apartment, or a guest suite with a door of its own?
Your partner agent reads the listing
A partner agent I trust in Box Elder County reads the remarks and the plan for a second space, then sets up the showings.
We check the permit and the lot
Together we go through the photos, and we ask about anything unclear before the offer is written. That includes the permit, the zone, the parking and the sewer.
The offer comes last
Your partner agent drafts it. I keep working the homework and the loan side until the keys are yours.
Where to look
Lot sizes across Tremonton
No list tells me which Tremonton homes have a second space, so this map shows lot size instead. County parcel records from 2020 show about 42 percent of homes, 898 of 2,143, on lots of 11,000 square feet or more. That is the lot size the state rule uses.
Center
Main Street and the old townsite
The first town grid, laid out in 1903. Lots here are the smallest typical ones in town, with a median of about 0.21 acre. The code names no lot size for an ADU, but the lot has to fit the parking and the setbacks.
East side
East of the Malad River
A median lot of about a third of an acre, and 90 percent of homes here sit on a quarter acre or more. A back yard may leave room for a detached unit.
West side
West of the freeways
The median lot is about 0.37 acre on the west side, bigger than the old grid's 0.21. A back yard may leave room for a unit of 300 square feet or more, with its parking.
Northwest
1000 North and 2300 West
County records list acre-plus home lots along 1000 North, west of the freeways, and along 2300 West. A big lot has the most room, but check whether it is on city sewer.
Far east
The far east side
The city's land use plan calls these blocks mostly rural, with a good number of one-acre and two-acre lots. The median lot here is about half an acre.
Communities and searches to look at first
The quick check
Is it an ADU, or a guest suite?
Tick what the home has. Every box draws its part of the suite, and the answer under the drawing changes with you.
What the home has
What it looks like
It has all the parts of an ADU
It has a door, a kitchen, a bath, a legal bedroom and a permit. Ask Tremonton's Community Development office to confirm the unit is on record as an ADU, and how the owner rule applies.
It looks like an apartment. Check the permit.
No permit on file means extra rooms, not a legal ADU. Ask for the records before you plan to rent it.
A guest suite with a door of its own
It has a private way in and a bath, yet no full kitchen. It is not an ADU, but you can use it from day one.
A suite inside the house
A bath apart from the main rooms. Flexible space, but everyone walks through one front door.
Tick what the home has
Many homes on this page sit between a guest suite and a full ADU. Tick the boxes to see which one fits.
Client reviews
What a past client said
These are real reviews from past clients, shown as they wrote them.
Posted by past clients on Google and Experience.com.
If you want a very competent, knowledgeable, personable, honest realtor, who has your back every step of the way, Scott is your guy! He leaves no stone unturned and genuinely has your best interests in mind at all times. He communicates every move. Working with Scott definitely made this the easiest and most stress free real estate transaction that I have ever experienced!! Thank you, Scott!!
From The Local
The town around the house
A search narrows down houses. It cannot tell you what the town is like. These Tremonton guides on The Local, the editorial side of MovingUtah, cover the county fair, the parks, daily life and what sets the town apart.
Things to do in Tremonton, from the summer festivals to the fair to a splash pad
Tremonton sits where I-15 meets I-84 in the Bear River Valley, and its things to do run to two summer festivals, the county fair, a splash pad, and golf.Read the guide
The Box Elder County Fair and Golden Spike Rodeo, Tremonton's biggest week
The Box Elder County Fair and Golden Spike PRCA Rodeo fills the Tremonton fairgrounds each late August, a valley tradition that dates to 1925.Read the guide
Living in Tremonton, day to day
Tremonton sits at the Bear River Valley crossroads with its own grocery, hospital, library, and community fiber, so most weeks never call for a drive south.Read the guide
Moving to Tremonton, and the crossroads you buy into
Tremonton sits where I-15 and I-84 split in the Bear River Valley, trading big-metro proximity for more room, its own hospital, and no commuter rail.Read the guide
Parks and recreation in Tremonton, the neighborhood greens, the free splash pad, and the valley leagues
Tremonton keeps neighborhood parks on its grid, a free summer splash pad beside the library at Shuman Park, a 9-hole golf course, and valley rec leagues.Read the guide
What makes Tremonton different, a small town with real industry and big road access
Where I-15 and I-84 split in northern Utah, Tremonton pairs a small-town core with a cereal plant, its own hospital, and fast growth off the interstate.Read the guideQuick answers
Casitas and ADUs, answered
Talk to Scott
Need a partner agent for the permit questions?
Tell me whether you want a full ADU, a basement apartment or a guest suite. I connect you with a partner agent I trust in Box Elder County for the showings, and I stay on your file for the homework and the loan side. Before an offer, we ask the city what the lot can take.
How it works in Tremonton
- Ask me about any listing.Send me a Tremonton listing with a second space. I will ask the partner agent about its door, its kitchen and its permit.
- A partner agent nearby.I connect you with a partner agent I trust in Box Elder County for the showings, the offer and the closing. I stay on your file.
- A lender's eye on the listing.I am licensed in both real estate and lending. On any one purchase I take one role. If I am your lender, I can tell you early if a home could be hard to get a loan on.
- A reply within one business day.Ask about any home here. Call or text, and I get back to you within one business day.
Or call me: (435) 357-4345I reply within one business day.
Referral disclosure. Outside Southern Utah, I connect home sellers and buyers with partner agents I trust in their area. If you choose to work with an agent I refer, that agent's brokerage pays my brokerage (Real Broker, LLC) a referral fee. The fee comes out of the agent's compensation; it is not an added cost to you. You are always free to choose any agent you wish, and using a referred agent is never required.