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Homes with Casitas & Guest Houses in Grantsville, Utah
Grantsville sits out on the west side of Tooele County, far enough from the Salt Lake bench that lots run bigger and building departments are generally more relaxed about detached structures. That combination is exactly why casitas and guest houses show up here more often than in tighter Wasatch Front suburbs. A lot of Grantsville parcels are a third of an acre or more, some pushing a full acre with horse privileges still intact, which leaves room for a detached mother-in-law setup, a bunkhouse, or a small guest cottage without crowding the main house. Buyers relocating for Tooele Army Depot, the Miller Motorsports/UMC area employers, or the commute into the Salt Lake Valley via SR-36 and I-80 have driven steady demand for these setups, especially multigenerational families who need separate living quarters but want to stay on one property.
Grantsville's guest houses run the gamut from finished detached apartments with their own kitchens and bathrooms to simpler unheated bunkhouses used for storage or seasonal guests, so it matters to check the county records and current zoning before assuming full rental legality. Tooele County has gotten more specific about accessory dwelling unit permits in recent years, and not every structure on the MLS sheet was built or converted with a permit in hand. Some of these come attached to horse property or small acreage, which adds another layer of due diligence around water shares and outbuildings. Browse the active listings below to see what's currently on the market and get a feel for how much variation exists from one casita to the next.
July 2026 · Grantsville market
Live from the Utah MLS — what's actually happening in Grantsville right now.
Median sale
$464,900
13 closed in July 2026
Median DOM
28 days
listing → contract
Sale-to-list
101.3%
of final list price
Unsold inventory
164
active + pending
4 matching · page 1 of 1
Active listings
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Common questions
About homes with casitas & guest houses in Grantsville.
Does Grantsville allow accessory dwelling units (ADUs)? ▾
Yes, Grantsville City permits ADUs under its zoning code, but conditions apply — typically minimum lot size, owner-occupancy of the primary residence, adequate parking, and connection to city water and sewer. Detached ADUs face stricter rules than internal ones. Always verify the specific zoning on a parcel with Grantsville City before assuming a casita is legally rentable.
What's the difference between a casita, a guest house, and an ADU in Grantsville listings? ▾
In local MLS practice, a casita usually means smaller attached or semi-attached guest quarters, often without a full kitchen. A guest house is typically detached with its own bath and sometimes a kitchenette. An ADU is the legal designation — it requires permits, a full kitchen, and meets city code as an independent dwelling. Many Grantsville listings use these terms loosely, so confirm what's actually permitted.
Can I rent out a casita or guest house in Grantsville? ▾
Long-term rentals of permitted ADUs are generally allowed if the owner occupies the main home and the unit meets code. Short-term rentals (under 30 days) are more restricted and require separate licensing through Grantsville City. Unpermitted guest quarters cannot be legally rented as separate dwellings regardless of how they're built.
What price range should I expect for a Grantsville home with a guest house? ▾
Most homes with casitas or detached guest houses run roughly $650K to $1.3M, depending on acreage, age, and whether the secondary structure is permitted. Properties on one acre or more with a true detached ADU tend to sit at the higher end. Older farmhouses with converted outbuildings can come in lower but often need work to bring the second unit up to code.
Are there many homes with guest houses on the Grantsville market at any given time? ▾
Inventory is limited — usually a handful of active listings at a time rather than dozens. The combination of larger lots and existing secondary structures isn't common, so well-priced properties tend to move quickly when they hit. Setting up MLS alerts for new listings is the practical way to catch them.
How far is Grantsville from Salt Lake City and the airport? ▾
Grantsville is about 35 to 40 minutes from Salt Lake City International Airport via I-80, and roughly 45 minutes to downtown Salt Lake outside of rush hour. Tooele is 10 minutes south, and the closest major shopping is in Stansbury Park. It's a real commute, but manageable for hybrid workers.