Davis County · about 84,000

Layton

Detached allowed in single-family zones

The largest city in Davis County. Accessory dwellings are permitted in all single-family residential zones. The city’s handout, updated October 2026, is the published table: one unit, owner occupancy, no short-term rental, and a detached unit on a lot of 6,000 square feet or larger. That handout no longer lists the roof-pitch and material rules that were in the May version.

Internal ADU: Permitted in single-family residential zones.
Detached ADU: Permitted in single-family residential zones on a lot of 6,000 square feet or larger, per the May 2026 handout. A permit is required.
Lot: Handout minimum: 6,000 square feet, which is below the state floor and therefore allowed. A lot of 11,000 square feet or larger with a permitted house is covered by the statewide rule now in effect.
Size: Not more than 50% of the primary dwelling, and not more than 1,200 square feet. Height may not exceed the house. The handout lists 16 feet to the roof peak for a single story, and 25 feet for two stories.
Parking: The October 2026 handout requires one stall in addition to the two covered stalls for the house. It cannot sit in the front or street-side setback unless it is on an approved driveway. The state ceiling is still one stall under 650 square feet and two at 650 and above; the handout is asking for less than that ceiling.
Owner occupancy: Owner occupancy is required.
Rental: Short-term rental of the ADU is not permitted. Long-term occupancy only.
Design: The October 2026 handout does not set material, color, or roof-pitch rules. Outdoor living space is to stay 10 feet off a side or rear lot line. A balcony or deck more than 4 feet above grade is set back 15 feet from the rear line. Setbacks and height are in Table 6-4, and the unit may not be taller than the house.

Notes

Start with the Layton ADU handout, updated October 2026, and Municipal Code §19.06.300. The council hearing on the Senate Bill 284 amendment was September 17, 2026.

A building permit is required. Do not occupy the unit until it is inspected and approved. The city records an owner-occupancy agreement; the recorder’s filing fee on the handout is $45.

Statewide floor

Senate Bill 284, Utah Code §10-21-304, has been in effect since October 1, 2026. Every city on this list must allow a detached ADU as a permitted use — not a conditional use — on a lot of 11,000 square feet or larger that already has a permitted single-family house. A city may also allow one on a smaller lot. It may still set size, height, coverage, setbacks, and owner occupancy, and it may require that the unit not be larger than the house, not sit in the front yard, and not be rented for fewer than 90 days. Parking may not exceed one stall under 650 square feet, or two stalls at 650 square feet and above. A printed ban, or a conditional-use requirement, on a qualifying lot conflicts with the statute even if the code book is late. Confirm the city’s ordinance before anyone draws.

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