Salt Lake County · Service area

Can you build a backyard home in Herriman?

Herriman is still writing its detached ADU ordinance — and the clock runs out October 1.

Ordinance still in draft The state floor applies regardless.

Takes about 3 minutes. No email required to see your result.

What changed here on October 1

Herriman is still writing its detached ADU ordinance — and the clock runs out October 1.

Herriman's planning commission was still debating a detached ADU draft into early 2026, sending it back to staff over height, parking and privacy. Whatever the city lands on, § 10-21-304 sets the floor from October 1: a detached unit becomes a permitted use on qualifying lots, with no conditional use permit.

“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

Herriman ADU rules at a glance

Rule	Herriman — Draft ordinance — not yet final
Status	Detached ADU ordinance was in draft and continued by the planning commission in early 2026. Moving target. moving now
Proposed size	Draft capped the ADU at 1,000 sq ft or 50% of the primary residence, whichever is smaller. moving now
Proposed minimum lot	Draft proposed detached ADUs citywide on lots of 6,000 sq ft and up — below the state threshold. moving now
Owner occupancy	Included in the draft. moving now
Height, parking, privacy	The specific points the commission sent back for revision. moving now

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 still bringing this into line with the law that took effect 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 Herriman before you sign anything.

What that means on your lot

Herriman's newer subdivisions are mostly under 11,000 sq ft, so the city's own 6,000 sq ft draft threshold may end up mattering more here than the state line.

Is my Herriman lot 11,000 sq ft?

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.

Quoted on your Herriman lot

Eight plans, from The Lookout at 784 sq ft to The Launchpad at 3,061 sq ft. A plan that is one component stack shows that price. The others say request a quote.

ADU calculator → · How the price works →

Can you build a backyard home in Herriman?

Herriman is still writing its detached ADU ordinance — and the clock runs out October 1.

Herriman ADU rules at a glance

Herriman's newer subdivisions are mostly under 11,000 sq ft, so the city's own 6,000 sq ft draft threshold may end up mattering more here than the state line.

Is my Herriman lot 11,000 sq ft?

Quoted on your Herriman lot

Three places to start

The Lookout

The Encore

The Loft

There's still $2,200 a month hiding in your house.