ADU Design
Site evaluation, concept floor plans and construction-ready drawings shaped around your lot.
Serving Cottonwood Heights and 23 nearby cities
ADU Builder in Cottonwood Heights, UT
ADU design and construction for Cottonwood Heights homeowners. The city between the canyons, where a high central ridge makes grade the first question on almost every project.
No obligation. Every estimate starts with a straightforward conversation and a walkthrough of your lot.
Design → Permits → BuildDetached · Attached · Garage
Building ADUs in Cottonwood Heights
Cottonwood Heights sits along the east bench of the Salt Lake Valley with about 33,600 residents. Its official nickname is "City between the canyons", because the valleys of Big and Little Cottonwood Creeks narrow into Big and Little Cottonwood Canyons at the city’s eastern edge.
A high ridge separating those two creek valleys dominates the geography, and residential development sits largely on that ridge. Commercial activity is concentrated in the lower-lying areas to the north, along Fort Union Boulevard and near Big Cottonwood Creek. In practical terms: if you live here, you very likely live on elevated, sloping ground.
That single fact shapes ADU work in Cottonwood Heights more than anything else. Grade determines foundation type, whether retaining is needed, how drainage is routed around a new structure, and where an entrance can sit at a level a person can comfortably use. None of it makes a unit impossible — plenty get built — but all of it needs deciding during design rather than during excavation.
The second recurring issue is access. Getting a concrete truck and framing material to the rear of an elevated lot, past an existing house, is frequently the thing that decides whether a backyard build is realistic at all.
What Shapes an ADU Project in Cottonwood Heights
Built on the Ridge
Residential Cottonwood Heights sits largely on the high ridge between Big and Little Cottonwood Creeks. Sloping, elevated ground is the norm rather than the exception here.
Grade Drives the Foundation
Stepped footings, retaining and a deliberate drainage plan are standard on these lots. It is solvable engineering, but it is designed for rather than discovered.
Access Can Be the Deciding Factor
Reaching a rear building site on an elevated lot past the house is often the constraint that determines whether you build new or convert existing space.
What we build
ADU Services in Cottonwood Heights
ADU Construction
Full-scope building from foundation and framing through mechanical rough-in and final finishes.
Garage Conversion
Turning an attached or detached garage into a self-contained unit using what is already on site.
Detached ADU
Standalone backyard units with their own foundation, entrance and utility connections.
Attached ADU
Additions sharing a wall or roofline with the main house while staying fully self-contained.
ADU Remodeling
Updating an existing ADU, basement apartment or converted space to a livable standard.
Cottonwood Heights Property Conditions to Plan For
On a Cottonwood Heights property, we work through these before discussing layouts:
- Degree and direction of fall — determines foundation approach and how much excavation is involved
- Retaining requirements — frequently the difference between a straightforward build and an expensive one
- Drainage and runoff routing — water has to be directed around a new structure on a slope, deliberately
- Rear access route — width, gradient and surface of the path equipment would take
- Whether a level entrance is achievable — decisive if the unit is for a parent or anyone with mobility limits
- Canyon-adjacent snow and runoff — meaningful exposure here shapes roof pitch, insulation and entry placement
Where the grade and access work, a detached ADU on a Cottonwood Heights lot can be exceptional. Where they do not, a garage conversion or a basement conversion sidesteps the excavation entirely and still produces a self-contained unit. The honest answer comes from design work on the actual slope.
Need Help?
ADU Questions From Cottonwood Heights Homeowners
What comes up most often when we walk properties in Cottonwood Heights.
Are ADUs allowed in Cottonwood Heights?
Utah state law makes internal ADUs a permitted use in most residential zones statewide. Detached units are governed by Cottonwood Heights City ordinance, and cities can apply parking, owner-occupancy and rental licensing requirements. Rules change over time, so confirm the current position with Cottonwood Heights City during planning. We prepare what the process requires.
How much does slope add to the cost?
It depends entirely on how much fall there is and what has to be retained, which is why we will not put a number on it before seeing the lot. What we can tell you at the walkthrough is whether your grade is a modest premium or a genuine obstacle — and that distinction is usually clear within twenty minutes on site.
Can equipment reach the back of my property?
It is the first thing we assess here, and occasionally the answer is no. A steeply rising or very narrow side yard can rule out a rear foundation pour. Where that happens there are sometimes workarounds, and sometimes the right recommendation is to convert existing space instead.
Does being near the canyons affect the build?
Yes, in terms of exposure. Canyon-adjacent properties see meaningful snow and runoff, which shapes roof pitch, insulation depth, gutter planning and where an entrance sits relative to drifting. It is designed for rather than dealt with afterwards.
Can I still get a single-level unit on a sloped lot?
Often yes, and it is worth asking for explicitly. On a slope the design question becomes where the unit sits so its entrance can be reached without steps. That usually favours one particular position on the lot, which is exactly what siting is meant to establish.
Nearby Areas We Serve
We work across South Davis County and the greater Salt Lake area. If your property is near Cottonwood Heights, these are the neighbouring communities we cover:
- Holladay — immediately north
- Sandy — south
- Murray — west
- Millcreek — north-west
- Bountiful — our base in South Davis
The full list is on our service areas page.
Build an ADU in Cottonwood Heights
Cottonwood Heights lots are among the most interesting in the valley to build on, and among the least forgiving if the grade work is treated as an afterthought.
We design and build detached ADUs, attached ADUs, garage conversions and basement conversions throughout Cottonwood Heights.
Send us the address and we will come and look at the actual slope before saying anything about cost.