ADU vs. Tiny Home: What's the Difference?
An ADU is a legal classification — a permitted second dwelling on your lot, usually foundation-set — while a tiny home on wheels is legally an RV in most of Utah. That one difference decides where you can live in it, how you finance it, and whether it adds property value. Cocoon builds both from the same floor plans: tiny homes on wheels in our Utah shop, and permanent ADUs on-site on your lot. Our smallest home, the 100 Series studio, is typically $63,000.
What legally separates an ADU from a tiny home?
"Tiny home"
Describes the house itself — a compact dwelling, typically 100–400 square feet.
"ADU" (accessory dwelling unit)
Describes its legal status: a permitted secondary residence on a lot that already has a primary home.
A tiny home becomes an ADU when it's permanently placed and permitted as a dwelling. The two labels answer different questions: one is about the building, the other is about the paperwork.
A tiny home on wheels (THOW) that stays on its trailer is treated differently. Most Utah cities classify a THOW as a recreational vehicle — personal property, like a trailer or motorhome — which means it generally can't be a full-time residence on a standard residential lot.
That paperwork matters more in Utah than ever
In 2026 Utah passed SB284, which requires cities with 5,000 or more residents to allow detached ADUs — backyard cottages, standalone guest houses — with cities required to adopt an ADU policy by October 2026. A permitted ADU is real property: it's inspected, addressed, and part of your home's value.
Which one costs more?
Nationally, professionally built tiny homes on wheels run $70,000–$150,000 according to Clever Tiny Homes' 2026 pricing guide, while foundation-set ADUs commonly land between $80,000 and $200,000+ once site work is included.
Cocoon builds both, from the same floor plans. Our most popular model, the 300 Series — a true one-bed, one-bath at 300 square feet — is typically $84,000. As a tiny home on wheels, built in our shop and delivered, that's close to your all-in number. As a permanent ADU, our Utah crew builds it on-site on a foundation on your lot, and site work (foundation, utility hookups, permits) adds 35–50% on top of the home price — we walk you through every dollar in our Utah ADU cost guide.
Quick comparison: permanent ADU vs. tiny home on wheels
| Cocoon ADU, built on-site | Tiny home on wheels (THOW) | |
|---|---|---|
| Legal status | Permitted dwelling, real property | RV, personal property |
| Where it can go in Utah | Residential lots per SB284 and your city's rules | RV parks, manufactured-home communities, some unincorporated land |
| Typical all-in cost | Typically $84,000 + 35–50% site work | $70,000–$150,000, minimal site work |
| Financing | HELOC or construction loan (most common) | RV loan |
| Effect on property value | Adds value — real property an appraiser can count | None — not part of the appraisal |
Where can you actually put each one in Utah?
SB284 sets a statewide floor and your city fills in the details — setbacks, height, size caps, and parking are still local decisions, and two homeowners a mile apart can get different answers. Our Utah ADU tracker keeps city-by-city rules current for 34 Wasatch Front cities.
Full-time living is generally limited to licensed RV parks, manufactured-home communities, and rural unincorporated land where zoning permits long-term RV occupancy. Eagle Mountain is the notable exception — it allows tiny homes on wheels in some residential zones. For most Utah addresses, though, the wheels are what keep a tiny home from being a legal residence in your backyard.
Not sure how your lot reads? Tell us your city and lot and we'll tell you what's actually possible — we respond within one business day.
Tell us your city and lotHow do financing and resale compare?
A permitted ADU qualifies for real-estate financing. Most of our backyard-ADU buyers use a HELOC or traditional mortgage type financing; construction loans and asset-based loans are also common, and we can introduce you to lender partners. The payoff shows up at resale: a permitted ADU is real property, so an appraiser can count it in your home's value.
A THOW can use a HELOC as well, but traditional mortgage type financing is usually off the table. Instead, a THOW can be financed like a vehicle — typically an RV loan, available on our towable models. Terms are shorter and the unit doesn't appear in your home's appraisal. That's not automatically bad: if you want flexibility, a getaway unit, or housing you can relocate, personal property is the point.
What if you're not sure which one you want?
This is where Cocoon is different: we build both, from the same five floor plans (170 to 500 square feet), so you can choose the layout first and work out the legal question with us. As a tiny home on wheels, it's built in our Utah shop on our proprietary steel chassis and delivered — towable, or set semi-permanently. As a permanent ADU, our Utah crew builds it on-site on a foundation on your lot, permitted and inspected to residential code at every stage — and because it's built in place, it can be wider than 10 feet, larger, or get a second-story loft. Either way, we prepare stamped plans and work directly with your city.
Tiny home on wheels
Built in our shop and delivered, road-ready on its chassis.
Semi-permanent tiny home
Delivered and set on piers, ground jacks and earthquake straps.
Permanent ADU
Built on-site on a foundation by our Utah crew and permitted as a dwelling.
A tiny home on wheels takes 10–16 weeks to build once plans are final. A permanent ADU's schedule depends on your city's permitting and your site — we'll give you a real timeline after a site walk. Most people pick one or the other, but if your plans change, we can convert a tiny home on wheels into a permanent ADU. See all five floor plans from 170 to 500 square feet.
ADU vs. tiny home FAQ
Is a tiny home on wheels legal to live in year-round in Utah?
Generally only in licensed RV parks, manufactured-home communities, or unincorporated areas that allow long-term RV occupancy — most cities classify a THOW as an RV, not a dwelling. Eagle Mountain, which allows THOWs in some residential zones, is the main exception.
Does an ADU add more value to my property than a tiny home?
Yes. A permitted ADU is real property, so an appraiser can count it in your home's value. A tiny home on wheels is personal property and doesn't count in your appraisal.
Can I get the same floor plan as an ADU or a tiny home?
Yes. Cocoon builds both from the same five floor plans. As a tiny home on wheels, it's built in our shop on a steel chassis and delivered; as a permanent ADU, our Utah crew builds it on-site on a foundation on your lot, permitted as a real dwelling. Most people pick one or the other, but we can convert a tiny home on wheels into a permanent ADU if your plans change.
How long does it take to get one?
A tiny home on wheels takes 10–16 weeks to build once plans are final. A permanent ADU is built on-site, so its schedule depends on your city's permitting and your lot — budget 35–50% of the home price for site work, and we'll give you a timeline after a site walk.
Ready to talk through your lot? Schedule a discovery call — no pressure, just straight answers.
Schedule a discovery callLast updated: September 2026 · Cocoon Homes, Lehi, Utah