Utah's new ADU law (SB284) changed the answer for thousands of homeowners. Tap your city on the map, or scroll the full list below - 34 Wasatch Front cities, kept current as ordinances update toward the October 2026 deadline.
Tracker last reviewed June 11, 2026
Find your city
Hover a dot to see the city; tap or click to pull up its rules.
Detached allowed Conditional Updating / confirm
Pick a city to see its rules
Tap any dot on the map and this panel fills in with that city's ADU rules — lot size, height, owner-occupancy, and a link to the official source.
What SB284 actually does
The statewide floor - then your city fills in the details
In 2026 Utah passed SB284, expanding the state's ADU rules to detached units - backyard cottages, garage apartments, standalone guest houses. Before this, many cities could prohibit them outright. Here's the shape of it:
Cities must allow them
Cities with 5,000+ residents must permit detached ADUs, and cities without an ADU policy must adopt one by October 2026.
The 11,000 sq ft line
Lots 11,000 sq ft or larger are squarely who the law opens doors for - though many cities allow ADUs on smaller lots too.
One ADU per lot
Across Utah, you get one ADU per lot - internal or detached, not both - and it can't be sold off separately.
Your city sets the specifics
The state sets the floor. Setbacks, height, size caps, parking, owner-occupancy, and design are still your city's call.
That last point is the whole game. Two homeowners a mile apart in different cities can get different answers. The map and list here keep the city details straight - but ordinances are changing month to month right now, so always confirm with your city before you design or budget.
The questions homeowners ask before calling their city
Are detached ADUs legal in Utah?
Yes — as of 2026, Utah's SB284 requires cities with 5,000 or more residents to permit detached ADUs, and cities without an ADU policy must adopt one by October 2026. The law squarely covers lots of 11,000 sq ft or larger, you get one ADU per lot, and your city still sets setbacks, height, size, parking, and owner-occupancy rules.
Does my city allow a detached ADU right now?
It depends on the city — and ordinances are changing month to month ahead of the October 2026 deadline. Use the map and city list above for the current status of 34 Wasatch Front cities, each with a link to the official source, then confirm with your city's planning department before you design or budget.
Once my city approves it, what does an ADU cost?
A Cocoon ADU home runs about $55,000 to $104,000 depending on model, with site work, utilities, and city costs typically adding 35–50% on top. See the full breakdown and cost calculator on our Utah ADU cost guide.
Do these rules apply to tiny homes on wheels?
Generally no. SB284 covers foundation-built dwellings — most Utah cities classify a tiny home on wheels as an RV, which can't be a full-time residence on a standard residential lot. Eagle Mountain is the notable exception. We break down the legal difference in our ADU vs. tiny home guide.
Not sure how your lot reads under the new rules?
We build ADUs across the Wasatch Front and handle the part most homeowners dread - zoning, permitting, and hookups. Tell us your city and lot, and we'll tell you what's actually possible.
This tracker is general information from Cocoon Homes to help Utah homeowners get oriented - not legal advice, and not a substitute for your city's planning department or the current Utah Code. Rules change; we note when each city was last reviewed, but always confirm specifics with your city before relying on them.
