Accessory dwelling unit construction cost — Centennial, CO

Last updated: September 24, 2026

When a property is larger than average, like many in Centennial, the potential for adding an accessory dwelling unit expands significantly. This is particularly true in established neighborhoods such as Cherry Creek. They understand how to maximize your property's potential while ensuring compliance. Whether you envision a detached backyard unit or an integrated in-law suite, these pros handle the entire process. They focus on quality construction and efficient project management. Get clear, expert advice and a precise quote tailored to your property. Don't let potential slip away; call us today to get started.

What affects the price

Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

The cost of building an ADU depends on your choice of materials, the square footage, and whether you are doing a garage conversion or a new detached build. Site access and utility upgrades also play a big role in the final bill. Exact pricing confirmed free on the call.

Frequently asked in Centennial

Also serving nearby: Aurora · Denver · Lakewood · Westminster · Arvada

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

Serving all of Centennial — population 106,883; about 3,544 residents per square mile across 30.2 sq mi.

Neighborhoods served in Centennial: Cherry Creek, Southglenn, Willow Creek, Dove Valley, Hampden — and every surrounding area.