What does an ADU actually cost in Utah?
Most sites quote you a scary number for a backyard home, then go quiet on why. Here's the honest breakdown for 2026 — what the home costs, what the site work adds, and where the real money goes — plus a calculator to ballpark your own project. Every Cocoon ADU is built on-site on your property by our Utah crew, with all-in builds typically running $75,000–$200,000.
Ballpark your ADU
Pick a floor plan, a footprint, and your site difficulty. We'll show the home price plus a realistic all-in range — the home plus the 35–50% most Utah projects add for foundation, utilities, and city costs.
Where the money actually goes
When you build an ADU, the home itself is the predictable part. The variable — and the part that surprises people — is everything required to turn a bare patch of your backyard into a permitted, connected, livable dwelling on your lot. As a rule of thumb, plan for an additional 35–50% on top of the home price to cover all of it:
So a real example: our most popular plan, the 300 Series One Bedroom at $78,000, with a typical 35–50% site adder, lands around $105,000–$117,000 all-in as a permanent backyard ADU. A simpler site trends toward the bottom of the range; a tricky one toward the top. Go wider, add square footage, or add a loft and you move up toward $200,000.
What pushes your number up or down
The biggest single lever is how much house you build — width, square footage, and whether you add a second-story loft. After that, if two identical homes a mile apart cost very different amounts to install, the difference is usually below ground. The biggest swings:
Width, square footage & loft
Because we build on your lot, an ADU isn't capped at the 10-foot width of a towable home. Going wider, adding square footage, or adding a second-story loft is the difference between a $105k build and a $200k one.
The electric panel
Can you tie into your existing service, or does the city require a separate panel for the ADU? A new panel and meter adds real cost.
The sewer run
Tying into your home's existing sewer line is affordable. Having to run a brand-new line all the way out to the street is one of the priciest scenarios.
Dirt vs. concrete
Trenching utility lines through open dirt is straightforward. If we have to cut through a driveway or patio and then repair the concrete, that adds labor and material on both ends.
None of these are dealbreakers — they're just the questions worth answering early. When we walk your lot, these are the first things we look at, because they're what move your number most.
Why a Cocoon ADU costs less than a traditional custom build
Search "ADU cost Utah" and you'll see detached units quoted at $200,000–$400,000. Those numbers are real — for a one-off home designed from scratch, bid out to a rotating cast of subcontractors, and managed by a general contractor who has never built that plan before.
We don't work that way. Cocoon ADUs are built on-site on your property by our own Utah crew — that's how permitting and inspections are done right — but they're built from floor plans we've already engineered, permitted, and constructed many times over. The drawings exist. The material packages are standardized and bought in volume. The same crew builds the same plans, so there's no learning curve on your dime. And because one team handles design, permits, and construction, you're not stacking a general contractor's markup on top of every sub. That repetition is where the savings come from — and we pass them straight to you.
We're honest that we're not the cheapest shed-in-a-box — we're the best value: a real, durable, full-time home, built to residential code on your property, at a price a one-off custom build can't touch.
How people pay for it
Here's a key point most homeowners miss: because your ADU is built on-site on a permanent foundation, it's a real, financeable home — which opens up far more lending options than a home on wheels.
Bank & credit union loans
Most banks and credit unions will lend on a permanent, foundation-built ADU. Many now offer renovation-to-permanent loans that factor in your home's future value with the ADU included.
Our lender partners
We work with lenders who already know our product and are comfortable lending on a Cocoon ADU build — which can make approval smoother than starting cold.
HELOC
A home equity line against your existing home is a popular, flexible way to fund the build. We provide the documentation your lender needs.
We're not lenders or financial advisors — but we've helped a lot of homeowners line up financing, and we're glad to point you in the right direction.
What people use an ADU for
An ADU is extra space that's close enough for connection, private enough for independence. The homeowners we build for are usually after one of these:
Passive income
Generate rental income — long-term or short-term — from a unit on land you already own.
Multi-generational living
A private suite for aging parents, young adults, or extended family — together, but with everyone's own space.
Flexible space
A home office, guest retreat, studio, or your own quiet getaway — a few steps from the back door.
Compliant and supported. Local zoning, building regs, permits, utility hookups — there's a lot to navigate. We guide you through all of it, so your ADU goes in smoothly and to code. (See where your city stands on the Utah ADU tracker.)
How it works
Our floor plans come in Studio, one-bedroom, and two-bedroom layouts — sized to fit real ADU lots and local rules — and because we build on your property, they can be widened, extended, or given a second-story loft. You choose the finishes: flooring, paint, countertops, cabinets, and more. Energy-efficient windows, durable framing, and straightforward utility connections. Here's the path:
Want to see and feel the craftsmanship first? Visit our Lehi model and walk through one in person.
Utah ADU cost FAQ
Want a real number for your lot?
The calculator gets you a ballpark. A short conversation gets you an actual figure — based on your city, your lot, and where your utilities run. No pressure, no obligation.
Figures on this page are general 2026 estimates from Cocoon Homes to help Utah homeowners budget — not a quote or a guarantee of price. Your actual cost depends on your floor plan, footprint, finishes, lot, utility access, and city. Rental figures reflect general Wasatch Front market ranges and vary by location and unit. We'll give you a real number after we understand your project.