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Homes with Casitas & Guest Houses in New Harmony, Utah
New Harmony sits at the base of Kolob Terrace above Ashcreek, at roughly 5,300 feet, which puts it a solid 15 degrees cooler than St. George in the summer months and gives it enough acreage-zoned lots that a detached casita or guest house is a normal thing to build here rather than an exception. Lots in and around town commonly run a half-acre to five acres, and the county's rural zoning in this pocket of Washington County makes it straightforward to add a second dwelling for aging parents, adult kids, or a rental. Buyers move to New Harmony for exactly this kind of room to spread out, and a lot of the existing inventory already reflects that with a bunkhouse, a converted barn apartment, or a purpose-built casita already in place.
A detached guest house here does more than add square footage on paper. It gives a family a place to put visiting grandkids without everyone tripping over each other, or it can run as a short-term rental for people coming through on their way to Zion, twenty-five minutes south, or Kolob Canyons, which is even closer. Because New Harmony is unincorporated and lightly regulated compared to St. George or Cedar City, casitas here tend to have fewer restrictions on how they're used, though buyers should still confirm septic capacity and any HOA language before assuming rental income. Browse the active listings below to see what's currently on the market with a casita or guest house already built.
July 2026 · New Harmony market
Live from the Utah MLS — what's actually happening in New Harmony right now.
Median sale
$704,001
1 closed in July 2026
Median DOM
1 days
listing → contract
Sale-to-list
100.7%
of final list price
Unsold inventory
21
active + pending
3 matching · page 1 of 1
Active listings
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Common questions
About homes with casitas & guest houses in New Harmony.
Can I rent out the casita or guest house as a short-term rental in New Harmony? ▾
New Harmony is unincorporated Washington County, and the county does not allow short-term rentals (under 30 days) in most residential and agricultural zones. Long-term rentals of a casita are generally fine, but verify zoning and any deed restrictions on the specific parcel before counting on rental income.
Do guest houses in New Harmony usually have separate utilities? ▾
It varies. Many properties share a single well and septic between the main house and casita, while larger estate parcels have a dedicated septic tank or even a second meter for the guest structure. The listing remarks or a quick call to the seller's agent will tell you, and it matters for both financing and future rental use.
Does a detached guest house count as an ADU for lending purposes? ▾
Lenders look at whether the secondary structure has a kitchen, bath, and separate entrance, and whether it's permitted as an ADU or just as a guest quarters. Some appraisers will give it value as an ADU; others count it as a bonus outbuilding. If financing depends on rental income, get clarity from your lender before going under contract.
How is the weather different from St. George for casita guests? ▾
New Harmony's 5,200-foot elevation means summer highs typically run 10–15 degrees cooler than St. George, and winters bring snow and freezing nights from roughly December through February. Casitas need real heating systems here, not just the swamp coolers that work fine down in the valley.
What price range should I expect for a New Harmony property with a guest house? ▾
Most acreage homes with a functional casita or detached guest house list from the high $700s to around $1.5M, with larger horse properties and custom estates running higher. Water shares, shop space, and view orientation toward Pine Valley Mountain drive a lot of the spread.
Are casitas common on horse properties here? ▾
Yes. New Harmony has a strong equestrian presence, and several working horse setups include a casita used as a tack apartment, trainer's quarters, or family guest space. If horses and a guest house are both on your list, this is one of the better small towns in southern Utah to find that combination.