Utah County · Service area
American Fork's older core has the lots. The ordinance is being amended now.
Being amended now The state floor is what you can rely on today.
Takes about 3 minutes. No email required to see your result.
Like every specified municipality in Utah County, American Fork must have a compliant detached ADU regulation by October 1. Its older grid neighbourhoods contain a meaningful share of parcels over 11,000 sq ft.
“A specified municipality shall adopt a land use regulation that permits a detached accessory dwelling unit on any lot or parcel that is 11,000 square feet or larger…” — S.B. 284, Enrolled Copy, Utah Code § 10-21-304, effective October 1, 2026.
The numbers that decide your project
| Rule | American Fork — American Fork City Code — confirm current version |
|---|---|
| Status | Ordinance being amended for § 10-21-304 ahead of October 1. Arena confirms the current text at the counter. moving now |
| State floor from Oct 1 | Detached ADU is a permitted use on lots ≥ 11,000 sq ft, with no conditional use permit in a primarily residential zone. state law |
| Size ceiling | A city may bar an ADU larger than the main house, but may not impose an arbitrary maximum size. state law |
| Minimum tenancy | A city may require 90 consecutive days or longer. state law |
state law Quoted from the enrolled copy of S.B. 284 — primary source, verified.
confirm with city From the city's published ADU material or council reporting — Arena confirms at the planning counter before design.
moving now The city is actively amending this ahead of October 1, 2026. Treat as a moving target.
We would rather show you the gap than guess. Arena is a builder, not a law firm — confirm your parcel with American Fork before you sign anything.
What that means on your lot
That single number decides whether the new state law applies to you. Enter your address above — we'll tell you which rule you fall under and which plans fit, in about three minutes.
Arena publishes every price — seven plans from The Lookout at 735 sq ft to The Launchpad at 2,541 sq ft. One team owns design, engineering, permitting and construction.
From $128,625 · see every price →
Plans that fit a American Fork backyard
Permitting queues in American Fork will not get shorter after October 1.