ADU builder in Sandy, Utah
Cocoon Homes is a Lehi, Utah ADU builder that designs, permits and builds backyard ADUs in Sandy — typically $85,000–$200,000 all-in.
Sandy adopted Ord. 26-55 on September 15, 2026: detached ADUs on lots of 11,000 sq ft or more, in the side or rear yard, approved through an administrative permit.
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Sandy ADU rules at a glance
| Rule | Sandy |
|---|---|
| Detached ADU | Allowed — Ord. 26-55 adopted Sept 15, 2026 (4-2); administrative permit; side or rear yard |
| Lot minimum | 11,000 sq ft (motion for 10,000 failed 3-3) |
| Size / height | Lesser of 2,000 sq ft, 75% of the home's footprint, or accessory cap; 15 ft at 10 ft setback, or 18 ft / 1.5 stories |
| Setbacks | 10 ft side & rear minimum; 6 ft from the house |
| Parking / occupancy | Under 650 sq ft: 1; 650+: 2; owner-occupancy proven by deed + affidavit; 30-day minimum rental |
Last reviewed October 6, 2026 · Official source: Sandy City Ord. 26-55 · Sandy on our Utah ADU rules tracker
Sandy's size cap is three limits at once, and the smallest wins. Unless your home's footprint is over about 2,670 sq ft, 75% of that footprint binds before the 2,000 sq ft cap does, so your house sets the size of your ADU here.
Which Cocoon floor plans fit Sandy's rules
| Plan | Size | Fits Sandy's size rules? | Added parking |
|---|---|---|---|
| 100 Series studio (home ~$63K) | 170 sq ft | Yes, if your home's footprint is at least 227 sq ft (75% rule) | 1 added space |
| 200 Series one-bed retreat (home ~$73K) | 240 sq ft | Yes, if your home's footprint is at least 320 sq ft (75% rule) | 1 added space |
| 300 Series one-bedroom, most popular (home ~$84K) | 300 sq ft | Yes, if your home's footprint is at least 400 sq ft (75% rule) | 1 added space |
| 400 Series flex (home ~$94K) | 400 sq ft | Yes, if your home's footprint is at least 534 sq ft (75% rule) | 1 added space |
| 500 Series two-bedroom (home ~$109K) | 500 sq ft | Yes, if your home's footprint is at least 667 sq ft (75% rule) | 1 added space |
| Sandy limits height to 15 ft at a 10 ft setback, or 18 ft / 1.5 stories, and the accessory-building cap can also apply; we confirm the plan's roof height and size against both before design. | |||
Most owners go wider or add square footage; custom footprints up to Sandy's cap (the smallest of 2,000 sq ft, 75% of your home's footprint or the accessory-building cap) are available, and we size them to the rules before design. Stay under 650 sq ft and Sandy asks for one added parking space instead of two.
What an ADU costs in Sandy
Expect $85,000–$200,000 all-in for a Cocoon ADU in Sandy. The home is the starting number; site work, utilities and city costs add 35–50%, and the city's fees are usually $3,500–$9,000 of it. The 300 Series one-bedroom comes to about $113,000–$126,000 all-in. Sandy's 10 ft side and rear setbacks and 6 ft gap from the house decide where the ADU sits, and where it sits decides how long the utility runs are. A traditional custom-built ADU runs $200,000–$400,000+. Breakdown: Utah ADU costs.
What an ADU rents for in Sandy
We don't publish a Sandy-specific rent number yet. Across the Wasatch Front, ADUs rent for $1,200–$2,500 a month, a typical one-bedroom $1,200–$1,500 (regional, not Sandy's own). At $1,300 a month, a $113,000 build pays back in about 7–7.5 years of gross rent. Sandy's minimum rental term is 30 days, and you'll prove you live on the property with a deed and affidavit. More: ADU rental income in Utah.
How we build your ADU in Sandy
- Lot check. We check your lot against Ord. 26-55: the 11,000 sq ft minimum, the 10 ft and 6 ft setbacks, and the 75%-of-footprint size cap your house sets.
- Plan and finishes. Pick a plan or a custom footprint sized to Sandy's cap, then your finishes.
- Engineer-stamped plans submitted to Sandy. We file the permit set for Sandy's administrative permit, with your owner-occupancy deed and affidavit.
- On-site build. Our own Utah crew builds the ADU on a permanent foundation in your side or rear yard.
- Final inspection, utilities, keys. Sandy's final inspection, the utility connections, then your keys.
Sandy ADU questions
Can I build an ADU in Sandy?
Who builds ADUs in Sandy?
Do I have to live on the property?
How much parking does an ADU need in Sandy?
What's the maximum ADU size in Sandy?
Building in Sandy? We'll check your lot first.
Free, and you'll hear from us the same business day.
Ready to talk? Book a 30-minute call.
Nearby: ADU builder in Salt Lake County · Lehi · Draper · Salt Lake City
More on Utah ADUs: Utah ADU homes · ADU rules in 34 Utah cities · Floor plans