Adu cost — Westminster, 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
Your ADU investment is shaped by the complexity of the site, utility hookups, and the materials you select for construction. Adding features like custom cabinetry or premium exterior siding will influence the final number compared to a standard build. Exact pricing confirmed free on the call.
Frequently asked in Westminster
What's the typical cost to build an accessory dwelling unit in Westminster?
What's the permit process for ADUs in Westminster?
Can I build an affordable accessory dwelling unit in Westminster?
What are the rules for accessory dwelling units in Westminster?
How much does an ADU permit typically cost in Westminster?
What are the benefits of a detached accessory dwelling unit in Westminster?
What makes a 'best' accessory dwelling unit in Westminster?
Also serving nearby: Arvada · Thornton · Denver · Lakewood · Boulder
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Westminster — population 114,875; about 3,633 residents per square mile across 31.6 sq mi. ZIP codes covered include 80030, 80031, 80035, 80036.
Neighborhoods served in Westminster: Westminster Center, The Ranch Country Club, Standley Lake, Westlake Village, Westminster Station — and every surrounding area.
Areas we serve
Browse by state, then city.