ADU builder in Salt Lake County, Utah
Cocoon Homes, headquartered in Lehi, designs, permits and builds backyard ADUs in every Salt Lake County city on our tracker — Salt Lake City, unincorporated Salt Lake County, West Valley City, West Jordan, Sandy, Draper, Murray, Herriman and Bluffdale — typically $85,000–$200,000 all-in.
All nine allow detached ADUs, and most go further than the state requires: Draper's lot minimum is 6,000 sq ft, unincorporated Salt Lake County's and Herriman's are 7,000, and Salt Lake City and Murray list none.
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ADU rules by city in Salt Lake County
| City | Status | Lot minimum | Owner-occupancy | Details |
|---|---|---|---|---|
| Salt Lake City | Allowed by right (since 2023) | No minimum listed | Required — either unit | Salt Lake City ADU builder |
| Salt Lake County (unincorporated) | Allowed (2024 ordinance) | 7,000 sq ft | Required; affidavit recorded | Tracker |
| West Valley City | Allowed (June 23, 2026) | 11,000 sq ft | Owner in home or ADU | Tracker |
| West Jordan | Allowed (Ord. 25-34) | 10,000 sq ft | Not specified | Tracker |
| Sandy | Allowed (Sept 15, 2026) | 11,000 sq ft | Required (deed + affidavit) | Sandy ADU builder |
| Draper | Allowed | 6,000 sq ft | Required — either unit | Draper ADU builder |
| Murray | Allowed in any single-family zone | No minimum listed | Owner in primary or ADU | Tracker |
| Herriman | Allowed (May 27, 2026) | 7,000 sq ft | Required on primary home | Tracker |
| Bluffdale | Allowed (since May 2023) | Not specified | Not specified | Tracker |
Last reviewed October 6, 2026 · Every city's full rules on our Utah ADU tracker
Where ADU rules are most flexible in Salt Lake County
- No lot minimum listed: Salt Lake City, which allows detached ADUs by right citywide, and Murray, which allows them in any single-family zone. Bluffdale's minimum isn't specified on our tracker.
- Lot minimums under the state's 11,000 sq ft: Draper at 6,000, unincorporated Salt Lake County and Herriman at 7,000, and West Jordan at 10,000.
- At the state line of 11,000 sq ft: West Valley City and Sandy.
- Owner may live in either unit: Salt Lake City, Draper, West Valley City and Murray. Herriman requires the owner in the primary home.
- Longest-running rules: Salt Lake City has allowed ADUs by right since 2023, and Bluffdale since May 2023.
What an ADU costs in Salt Lake County
Anywhere in Salt Lake County, a Cocoon ADU usually lands at $85,000–$200,000 all-in. Home-only prices run from about $63,000 (100 Series studio, 170 sq ft) through about $84,000 (300 Series one-bedroom, 300 sq ft) to about $109,000 (500 Series two-bedroom, 500 sq ft). Getting the home livable on your lot (site work, utilities and city costs) adds 35–50%, with city fees typically $3,500–$9,000 of that. Most buyers land on the 300 Series at about $113,000–$126,000 all-in; going wider or adding a loft is what moves a project toward the top of the range. A traditional custom-built ADU runs $200,000–$400,000+. Full numbers: Utah ADU costs.
Rent for a Salt Lake County ADU
Salt Lake City is the one county city we have a local figure for: a one-bedroom rents for about $1,300–$1,430 a month there. For the other eight, we use the Wasatch Front regional range of $1,200–$2,500 a month (typical one-bedroom $1,200–$1,500), not a city-specific number. At $1,300 a month, a $113,000 build pays back in about 7–7.5 years of gross rent. Check the rental term too: Sandy's minimum is 30 days. More: ADU rental income in Utah.
From lot to keys in Salt Lake County
- Your city's rules, applied to your lot. Lot minimums in this county run from none to 11,000 sq ft, so we start by reading your address against the right city's ordinance.
- A plan that fits. Choose from five floor plans or a custom footprint sized to that city's limits, then finishes.
- Permit set filed for you. Engineer-stamped plans, prepared and submitted to your city by us.
- Built on your lot. Our own Utah crew builds on a permanent foundation.
- Inspected, connected, handed over. Final inspection, utility connections and the keys.
Salt Lake County ADU questions
Who builds ADUs in Salt Lake County?
Which Salt Lake County cities allow detached ADUs?
What's the minimum lot size for an ADU in Salt Lake County?
How much does an ADU cost in Salt Lake County?
Building in Salt Lake County? We'll check your lot first.
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Salt Lake County builder pages: Salt Lake City · Sandy · Draper
Other counties: Utah County · Davis County
More on Utah ADUs: Utah ADU homes · ADU rules in 34 Utah cities · Our home base: Lehi