Utah Zoning

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Lehi zoning code

26.040 Detached 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 It may be out of date.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.
08/26/25; 07/14/26) 1. All accessory buildings with an accessory dwelling unit require: (a) A minimum 11,000 square foot lot size. (b) The maximum finished living area of the dwelling unit shall be less than the square footage of the primary home. (c) Located to the side or behind the primary dwelling unit on the lot. (d) Located at least 6 feet away from the primary dwelling. (e) Must be on a permanent foundation. (f) Only one accessory dwelling unit is allowed per lot, meaning an ADU cannot be approved in the main structure and in a detached building. An owner may switch from an internal to an external accessory dwelling unit by submitting a new application and meeting all of the requirements. (g) All lighting shall comply with Section 12.110. (h) A separate address (assigned by the City) is required to be displayed in a size and location that is clearly visible from the street. (i) The address will be the primary home address with a ½ at the end signifying to emergency services that it is in a detached dwelling unit. (i) All utility services shall be connected to the primary dwelling. (j) Adequate all-weather access shall be provided for emergency service vehicles and utilities. Minimum width of 12 feet required. (k) The accessory dwelling unit if grater than 650 square feet in size shall include a minimum of two off-street parking stalls. If the accessory dwelling unit is less than 650 square feet in size only one off-street parking stall shall be required. Parking for the accessory unit shall be in addition to the parking required for the primary dwelling. Each parking stall shall be a minimum of 9 feet by 20 feet in size. (l) The accessory dwelling must meet all other requirements of Section 26.030 for Accessory Dwelling Units. 2. New build construction or conversion of an accessory building permitted after December 31, 2020 into an ADU will be a permitted use if it meets the following requirements: (a) Can be within five feet of either the side or rear property line if the wall within five feet has either no windows or two small opaque windows each no greater than two square feet in size. If the walls have windows larger than two square feet in size, a minimum setback of 10 feet is required for a one-story (maximum 20-foot height) structure. Any two-story structure (or that exceeds 20 feet in height) must meet the setbacks for a primary dwelling in the zone. (b) The height of the accessory building shall be no greater than the primary structure to a maximum of 35 feet. (c) The dwelling portion of the accessory building must be at least 300 square feet in area. (d) Review of a new build ADU or conversion of an accessory building permitted after December 31, 2020 into an ADU will be done by the Reviewing Departments to determine adequate access, utilities, address location, and other design features. 3. Conversion of an existing accessory building (permitted prior to January 1, 2021) into an ADU must meet the following requirements: (a) The dwelling portion of the accessory building must be at least 300 square feet and does not require a garage. (b) The dwelling portion of the building must have a minimum setback of 5 feet from the property line and 6 feet from the primary dwelling. (c) If the building is built within the required setback for the zone no windows can be on the side(s) of the structure within the required setback. (d) Review by the Reviewing Departments to determine adequate access, utilities, address location, and other design features.

26.030 Internal Accessory Dwelling Units · 26.050 Location of Accessory Buildings

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