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Homes with Casitas & Guest Houses in New Harmony, Utah
New Harmony sits at roughly 5,200 feet elevation in Washington County, tucked between the red-rock country of St. George to the south and the towering pines of Brian Head to the north. The town of fewer than 1,000 residents draws buyers who want Southern Utah sunshine — around 300 days a year — without the heat sink of the St. George valley, where summer highs routinely hit 108°F. New Harmony typically peaks 10–15 degrees cooler, which changes the calculus on outdoor living considerably. Parcels here tend to be generous, often starting at a half-acre and running into the multiple-acre range, and that land gives homeowners the physical room to add a detached casita, a guest house, or a converted outbuilding — something that's far harder to pull off on a St. George quarter-lot. Prices for single-family homes in New Harmony generally run from the mid-$500,000s into the low $1 millions, with properties that include a finished guest structure commanding a meaningful premium.
For buyers specifically seeking homes with casitas or guest houses, New Harmony makes a compelling case. Multi-generational families use the second structure to house aging parents or adult children while preserving everyone's privacy. Others offset carrying costs by renting the casita to long-term tenants — Washington County short-term rental rules apply, so confirm zoning before banking on nightly income. Remote workers have also found value in a detached office-slash-guest suite that creates hard separation between work and home life. Given the area's proximity to Zion National Park (about 30 minutes to the east entrance), a guest house can also serve visiting family well. 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
13
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.