ADU Construction in Boulder County
Accessory dwelling units, built like small custom homes: guest houses, backyard cottages, garage conversions, and basement suites across Boulder County.
ASSET REQUEST
ADU exterior photography
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ADUs we build
Detached backyard units, garage conversions, and attached or basement suites. An ADU is a complete dwelling - structure, envelope, kitchen, bath, mechanical - compressed into a small footprint, which makes the design and sequencing decisions denser, not simpler. We build them with the same pre-construction discipline as our custom homes.
ASSET REQUEST
Crew at work on site
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Feasibility before design
What you can build depends on where you are: lot, zoning, utilities, access, and the review process of your particular jurisdiction. The rules differ between Boulder, unincorporated Boulder County, and the surrounding towns, and they change. We confirm feasibility and realistic costs in pre-construction, before you invest in a design the site cannot carry.
HOLD US TO IT
We engage change orders promptly
Priced and communicated right away, so you decide with the full picture.
Pre-construction priced standalone
Build with someone else afterward and you owe us nothing beyond that fee.
The same monthly cost report we see, unedited
Every line, every month, before we discuss it.
ASSET REQUEST
Compact interior photography
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Why families build them
A place for parents that keeps them close and independent. Space for a returning kid, long-stay guests, a studio, or rental income. An ADU is the most flexible square footage a property can add, and it earns its keep across decades of changing use.
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Built like a house, because it is one
Small does not mean simple. An ADU carries every system a house does, on a tighter site with tighter tolerances. We run it with real drawings, real pricing, and the same finish standard as the main house.
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Where we build
We are based in Lyons and build ADUs across Boulder County and the near Front Range: Boulder, Longmont, Lyons, Niwot, Lafayette, Louisville, and Superior among them.
FAQs
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What does an ADU cost in Boulder County?
It is a complete small building, and honest pricing starts from your site and scope. Read why scope drives the budget.
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Can we build one on our lot?
That is a zoning and utilities question before it is a construction one. We confirm it in feasibility, early. Talk to us.
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Does an ADU add value?
It adds livable, flexible square footage; how much depends on your property and how you use it. See how we build.
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How long does it take?
It is a small custom home: design, permitting, and construction each carry real time, and jurisdiction review varies. Pre-construction gives you the honest schedule.
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Remodeling the main house too?
See home remodeling in Boulder.
