26.030 Internal Accessory Dwelling Units
Unofficial copy. It may be out of date. Not legal or zoning advice. Zoning rules change, and only the city or county can say for sure what is allowed on a property. Confirm with the city or county planning department before you buy, sign or build.
The official Lehi code is at https://www.lehi-ut.gov/government/codes-ordinances/development-code/.
Text pulled 2026-10-19 from this source.
Tables (like use tables) may not copy cleanly, so check any table against the official code.
Confirm anything here with Lehi planning before you rely on it.
9/14/21; 07/12/22)
One Accessory Dwelling Unit (ADU) may be allowed in an owner-occupied single-family detached home after obtaining all required permits and approvals. Any person constructing or causing the construction of an ADU shall first obtain a permit from the Planning Division. As long as the unit is rented and in use, an active ADU license is required, and the ADU shall meet the following:
A. Owner Occupancy Required. The owner of the primary residence shall live in the dwelling in which the ADU was created. The owner shall sign an affidavit therein stating that the primary dwelling will be owner occupied. This affidavit shall be recorded against the property and is required for all owners of the property who operate an accessory dwelling unit.
B. Appearance. The ADU shall not alter the appearance of the structure as a single-family residence. The structure shall not show external evidence of occupancy by more than one family.
C. Parking. ADUs shall provide one off-street parking stall. The parking stall shall be separate from, and not in tandem with the required parking for the primary dwelling. The minimum stall size is 9x20 feet.
A lighted walkway must connect from the parking area to the entrance of the ADU. Parking areas shall be constructed of appropriate material as set forth in Section 37.060(B)(4).
D. Zoning. ADUs shall only be allowed in singlefamily detached residential homes. ADUs shall not be allowed in any areas identified on the ADU Restricted Area Map.
E. Lot Size. The lot for a single-family home with an ADU shall be a minimum of 6,000 square feet in size.
F. Connection Between Units. There must be a physical connection (such as a locking door) between the primary dwelling and the ADU. The connection must be such that if the ADU was discontinued, the ADU living space could be accessed and used as part of the primary dwelling.
G. Building Division Approval. In addition to the approval required from the Planning Division, all ADUs shall be required to obtain a building permit from the Building Division and shall conform to all applicable standards in the City’s adopted building codes. The applicant shall obtain all necessary building permits and pay all applicable fees, including impact fees, prior to constructing the ADU.
H. Both an Accessory Dwelling Unit and a ShortTerm Rental permit may be obtained; however, only one of these uses may be active at a time. Only one accessory dwelling unit shall be in service at any given time per single-family dwelling lot.
26.020 General Requirements · 26.040 Detached Accessory Dwelling Units