Homes with In-Law Suites, Casitas & ADUs in St. George, Utah
In-law suite, casita, ADU , these terms get used interchangeably in Southern Utah listings and they all point to the same basic concept: a secondary living space on the same property as the main home. The differences are mostly in scale and separation, and understanding which type you're actually looking at matters before you make an offer.
St. George has strong and growing inventory of homes with secondary living spaces. The demand comes from several directions: the retirement and relocation market brings multigenerational households, the short-term rental market makes a casita a revenue-generating asset, and a lot of buyers from higher-cost markets are specifically looking for a home that can offset its mortgage with a long-term rental unit.
Listings in this search are filtered for homes with an in-law suite, casita, or ADU feature. MLS descriptions vary and some properties in this category may not appear here. or call 435-200-5508 and I can search more specifically for what you're after, including permit status verification.
In-Law Suite vs. Casita vs. ADU: What's the Difference?
- In-law suite: typically an attached secondary space within the main home, often with a private entrance, bedroom, bathroom, and sometimes a kitchenette. Shares a wall or interior connection with the main house. Common in newer production builds where the floor plan includes a dedicated suite as a standard or upgrade option.
- Casita: a detached or semi-detached guest cottage, usually more self-contained than an in-law suite. Common in Southern Utah's Southwest-influenced architecture. Often has its own entrance, full bathroom, and living area. The term gets used loosely , some "casitas" are really just attached suites with a separate exterior door.
- ADU (Accessory Dwelling Unit): the formal planning and zoning term for any secondary dwelling unit on a residential parcel. Can be attached or detached, new construction or converted space. Subject to city zoning rules and permitting requirements. Not all secondary spaces in listings are permitted ADUs , verifying permit status is critical if rental income is part of the plan.
Why St. George Is a Strong Market for Secondary Living Spaces
A few factors combine to make this a particularly active segment of the St. George market. The retirement and relocation wave brings extended families who want proximity without full cohabitation. The vacation rental market creates real demand for properties where an owner can occupy the main home while renting a casita independently. And Utah's generally ADU-friendly zoning environment has made it easier for builders to offer these configurations at multiple price points.
Neighborhoods like Desert Color, Little Valley, and newer corridors in south St. George and Washington have seen builders specifically market in-law suite floor plans as a feature. The result is meaningful inventory across price points that didn't exist in this market a decade ago.
Who Buys Homes with Secondary Living Spaces in St. George
- Multigenerational families: parents living with adult children, aging in-laws who need proximity but not full dependence, grown kids in transition , St. George's retirement-heavy buyer pool makes this a common configuration
- Vacation property owners: a casita or in-law suite gives guests their own private space while the owner uses the main home; works especially well for buyers who want occasional personal use alongside STR income
- Long-term rental income: a permitted ADU can generate monthly rental income that meaningfully offsets the mortgage; St. George's rental market is strong with consistent demand from workers and students
- Short-term rental investors: some buyers run the main home and casita as independent STR units, or occupy one and rent the other; STR eligibility depends on zoning and HOA rules for the specific address
- Remote workers and creative buyers: a detached casita makes an excellent dedicated home office, studio, or gym with real separation from daily household life
Are ADUs legal in St. George, Utah?
Yes, subject to city zoning approval and permitting. St. George City allows ADUs in residential zones under specific conditions covering lot size, setbacks, height limits, and occupancy rules. The most important thing to verify before buying is whether an existing secondary space is a permitted ADU or an unpermitted conversion. Unpermitted units can create issues with financing, insurance, and legal rental use. I verify permit status on any property with a secondary living space for my buyers.
Can I rent out a casita or in-law suite in St. George?
Long-term rentals are generally permitted for legal ADUs subject to city rules. Short-term rentals depend on the specific address's zoning and any HOA restrictions. Desert Color, for example, is specifically positioned for the STR market. Other neighborhoods may restrict or prohibit short-term use entirely. If rental income is part of your plan, verify both the ADU's permit status and the STR rules before writing an offer.
What should I look for when buying a home with a casita in St. George?
Permit status first. Beyond that: separate entrance and genuine privacy from the main home, independent HVAC and utilities if full separation matters, kitchen or kitchenette functionality, and HOA rules on secondary occupancy and rentals. I walk through all of this specifically with buyers looking for this feature so nothing surprises you after closing.
Do new construction homes in St. George come with in-law suites?
Yes, several builders in St. George offer floor plans with dedicated in-law suites as a standard or upgrade option. Little Valley, Desert Color, and newer south St. George production builders have made this a marketed feature. Worth asking specifically about floor plan options with an in-law suite or secondary entrance when touring new construction communities.
How does the St. George ADU market compare to Hurricane?
St. George has deeper inventory at more price points and more builders specifically marketing this configuration. Hurricane has strong casita options particularly in the Sand Hollow area, but the overall supply of permitted ADU homes is more limited. If secondary living space is a priority and you're comparing both markets, St. George gives you more options. See Hurricane in-law suite homes for that market's inventory.
St. George's Actual ADU and Casita Rules
This is where reading the city code before writing an offer earns its keep. St. George permits one accessory dwelling unit per lot (two inside the Downtown Boundary) with rules that have real teeth: an owner must live on the property, in either the main house or the ADU. Renting the suite long-term is allowed only with a recorded deed restriction and a rental dwelling business license. And nightly rental of an ADU is expressly prohibited, full stop, which surprises buyers arriving from markets where the casita doubles as an Airbnb.
The construction rules matter too: a detached ADU caps at 25 feet tall and must stay smaller than the main house, single-story versions get friendly setback treatment, and each ADU requires one additional off-street parking space that can't be tandem, with converted garages required to replace the parking they consumed. Utah's statewide law separately protects internal ADUs (the suite inside your house) as a permitted use in most single-family zones, but detached casitas run entirely on St. George's local rules. If a listing's suite matters to your plans, I confirm its permit status with the city before you commit, because an unpermitted "mother-in-law suite" is just a room with a hot plate.
