Cost of accessory dwelling unit — 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
The total price for an ADU depends on several moving parts, including the square footage, your foundation type, and local labor rates. Choosing high-end finishes or complex site prep will naturally increase the budget, while standard layouts help keep things manageable. Exact pricing confirmed free on the call.
Frequently asked in Westminster
What are the rental income possibilities for an ADU in Westminster?
What makes a 'best' ADU for a Westminster property?
The 'best' ADU for your Westminster property depends on your specific needs and lot. Consider factors like your desired use, such as for family or rental income, and the available space in neighborhoods like Sherrelwood. Pros can assess your property's unique characteristics and recommend the most suitable design. A well-designed ADU complements your existing home and maximizes its utility. Call for advice tailored to your situation.
What are the general rules for accessory dwelling units in Westminster?
How much does it typically cost to build an accessory dwelling unit in Westminster?
Are there prefab ADU options available for Westminster homes?
What does ADU construction involve in Westminster?
How can I find an affordable ADU 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: Old Town, Standley Lake, Sherrelwood, Westminster Mall Area, Walnut Creek — and every surrounding area.
Areas we serve
Browse by state, then city.