Accessory dwelling unit companies — 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

ADU companies offer end-to-end solutions, often handling everything from the first sketch to the final walk-through. You need these companies if you prefer a streamlined experience where one firm takes responsibility for design, permitting, and construction. They are ideal for homeowners who want to minimize the stress of managing multiple vendors and prefer a turnkey approach to adding a secondary residence to their property.

Frequently asked in Centennial

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

All cities in Colorado →

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, Littleton, Aurora, Highlands Ranch — and every surrounding area.