Home › Utah ADU rules › West Valley City
West Valley City is a 1st-class city (population 136,650), so Utah's detached ADU law applies: from October 1, 2026 it must allow a detached ADU on any lot of 11,000 sq ft or more that has a single-family home. West Valley City adopted its ordinance on June 23, 2026; its rules are below.
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| Minimum lot size | 11,000 sq ft State floor: 11,000 sq ft (Utah Code § 10-21-304). A city may allow smaller lots, not require larger. Source |
|---|---|
| Maximum size | Smaller than the single-family home on the same lot, and within the area limits for accessory buildings. In a rear yard it may cover, together with all other accessory buildings, no more than 25% of the rear yard. Source |
| Height | The height standards for accessory buildings in the zone apply. Source |
| Parking | 2 on-site spaces for a detached ADU of 650 sq ft or more, 1 for one under 650 sq ft, outside the front yard setback. Source |
| Owner occupancy | The owner must live in the single-family home or the detached ADU. Source |
| Setbacks and location | Side or rear yard only. In a rear yard, at least 5 ft from side and rear lot lines in a residential zone (10 ft in an agricultural zone); in a side yard, the zone's setbacks for the main building. At least 20 ft from any lot line on a street, and outside public utility easements. Source |
| Rentals | A business license is required to rent it, and rentals must be at least 90 consecutive days. One ADU (internal or detached) per lot. A permitted use. Source |
Impact fees. Confirm with West Valley City (801-966-3600).
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Design your Ekstra in West Valley CityOn a lot of 11,000 sq ft or more with a single-family home, yes: West Valley City is covered by Utah Code § 10-21-304, which requires it to allow one from October 1, 2026. West Valley City has adopted its ordinance.
11,000 sq ft, the state floor.
Smaller than the single-family home on the same lot, and within the area limits for accessory buildings. In a rear yard it may cover, together with all other accessory buildings, no more than 25% of the rear yard.
The owner must live in the single-family home or the detached ADU.
A business license is required to rent it, and rentals must be at least 90 consecutive days. One ADU (internal or detached) per lot. A permitted use.
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Last verified September 23, 2026. Not legal advice. Confirm with West Valley City Planning (801-966-3600) before you design or apply.