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Homes with Casitas & Guest Houses in New Harmony, Utah
New Harmony sits at about 5,200 feet on the east side of I-15, tucked under the red-and-pine flank of Pine Valley Mountain roughly 25 minutes north of St. George and 20 minutes south of Cedar City. It's a small ranching community — fewer than 250 households — where lots tend to run an acre or more, zoning is friendly to outbuildings, and water shares still trade hands at closing. That combination is exactly why casitas and detached guest houses are more common here than in tighter Washington County subdivisions. Owners use them for visiting family escaping summer heat down the hill, for adult children, for caretakers running horse setups, or as private quarters separate from the main house on a working property.
Buyers shopping New Harmony for a property with a casita or guest house are usually weighing a few practical things: whether the secondary unit has its own septic and meter, whether short-term rental is even permitted (Washington County rules are stricter than St. George city limits), and how the elevation changes daily life — New Harmony gets real winters with snow, unlike Hurricane or Washington, and summer nights drop into the 60s when St. George is still in the 90s. Acreage parcels with a main home plus a guest structure typically range from the high $700s into the $1.5M+ bracket depending on land, water rights, and barn or shop space. Browse the active listings below to see what's currently on the market.
May 2026 · New Harmony market
Live from the Utah MLS — what's actually happening in New Harmony right now.
Median sale
$2,300,000
3 closed in May 2026
Median DOM
284 days
listing → contract
Sale-to-list
112.7%
of final list price
Unsold inventory
18
active + pending
2 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.