Cost to build accessory dwelling unit — Centennial, CO
Last updated: September 24, 2026
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
When calculating the budget for a secondary unit, consider the costs for architectural design, permits, materials, and labor. Custom designs and high-end interior finishes will push your budget higher, while standardized layouts can keep costs more predictable. Exact pricing confirmed free on the call.
Frequently asked in Centennial
What are the rules for accessory dwelling unit rental in Centennial?
What is involved in ADU building in this city?
What types of detached accessory dwelling units are common?
What is an ADU unit and its purpose?
Are prefabricated accessory dwelling units a good choice?
What is the process for accessory dwelling unit construction?
What accessory dwelling unit services are available?
Also serving nearby: Aurora · Denver · Lakewood · Westminster · Arvada
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: Southglenn, Dove Valley, Willow Creek, Village of Southlands, Whispering Pines — and every surrounding area.
Areas we serve
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California (4)
All of California · Rialto · San Buenaventura (Ventura) · San Mateo · Vacaville