The map helps you find a practical starting point for an ADU review. An internal ADU is inside the main home; an external ADU is in a separate building. Our size bands are preliminary planning guidance, not statutory minimums or city approval.
Townhouses and condos are marked highly unlikely at any size. A recorded PUD, PRD, PRUD, planned community, resort community, or master planned community is also highly unlikely at any size unless that city’s research says the label is allowed. Grantsville lists PUD among permitted zones. Draper allows a detached ADU in a master planned community zone, subject to its lot minimum. West Jordan permits an internal ADU in a PRD and both paths in a planned community, with the external path only on lots platted at 10,000 square feet or larger. Lehi bars Resort Communities and Planned Communities. Orem bars accessory apartments in a PRD zone. Every other city stays on the unconfirmed screen for those labels. Commercial, vacant, and multifamily records also require a separate review.
| Lot size | Map guidance |
|---|---|
| Under 6,000 sq ft | ADU highly unlikely |
| 6,000–11,000 sq ft | Internal ADU may be possible |
| Over 11,000–15,000 sq ft | Internal or external ADU may be possible |
| Over 15,000 sq ft | Internal or external ADU likely |
Exactly 6,000 sq ft is in the internal-possible band; exactly 11,000 remains in that band; exactly 15,000 remains in the either-type-possible band. Missing lot size or residential-use information produces an unknown result.
Purple parcels identify reported or map-detected secondary buildings as a separate conversion-review category. Each map view and property search checks statewide building outlines for separate structures within the parcel. We also save site-owner reports by county and parcel ID. Mapping detections are unverified; older imagery may miss recent changes. You can also use “Confirm your property details” after searching your address. If you report an existing detached garage or other secondary building on an otherwise suitable property, we show internal ADU likely, or an existing secondary building may be convertible into an ADU.
The internal option refers to the main home. A separate building conversion is a different path; significant upgrades may be needed to its structure, access, utilities, and fire safety. Its current permitted use must be reviewed, and permission for a new external ADU is not established. Under-6,000-square-foot, townhouse, and condo exclusions still apply. A planned-community label follows that city’s research.
We distinguish saved property reports from new homeowner answers and include this information when you submit the property’s free-review form. Answers reset when you search another property.
Addresses and municipal boundaries come from the Utah Geospatial Resource Center. County Land Information Record parcels provide acreage, property class, subdivision name, and parcel outlines. Map and address-search coverage includes all 29 Utah counties, including unincorporated areas. Each loaded parcel is checked for mapped secondary buildings; county-border map views query both sides. This is an automatic review of available records, not an inspection of every property. Missing or older records can leave buildings undetected.
We flag explicit townhouse and condo labels, and explicit PUD, PRD, PRUD, planned community, resort community, and master planned community labels, in property classes and subdivision names. A generic subdivision name does not prove any of those. Some records omit these details, so you can also report a townhouse, condo, or PUD in the property panel. Saying yes on that question keeps the lot highly unlikely even where the city allows a planned-community zone.
Building outlines come from UGRC, Microsoft and OpenStreetMap (ODbL). We combine touching outlines and exclude roofs crossing parcel boundaries to reduce false matches. Coverage can be incomplete, and a mapped roof does not establish building use, condition, or permission to convert. The assessor housing-unit count is not a count of garages or outbuildings. We do not guess building-conversion opportunities from that number, and a count above one does not automatically make a residential property unlikely. We flag the existing permitted uses for review while applying the lot-size bands.
Zoning, HOA restrictions, occupancy, setbacks, parking, utilities, and building safety still need review. A favorable color is a reason to explore your options, not permission to build. Read our Utah ADU law guide for separate legal context.
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