Detached 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
A detached ADU is a standalone building separate from the main house, such as a backyard cottage or a converted carriage house. Homeowners prefer this style because it provides the most privacy for occupants and keeps the main residence quiet. Since it is a completely separate structure, it often requires independent utility connections and foundation work. Exact pricing confirmed free on the call.
Frequently asked in Westminster
What's involved in getting a prefabricated ADU in Westminster?
Can I build a home with a mother-in-law suite in Westminster?
Yes, building a home with a mother-in-law suite in Westminster is a popular option. These suites, often referred to as accessory dwelling units, provide independent living spaces within or attached to your main residence. The pros can guide you through the design and permitting process. They'll ensure your suite meets all local Westminster regulations for comfortable and private living. This adds significant versatility to your property.
How do I find a qualified ADU builder in Westminster?
What is the process for getting an ADU contractor in San Diego if I'm in Westminster?
Are there affordable ADU options for homeowners in Westminster?
What are the benefits of accessory dwelling unit homes in Westminster?
Accessory dwelling unit homes in Westminster offer numerous benefits. They provide flexible living spaces for family members, generate rental income, and increase property value. They are a smart way to add square footage without the disruption of a major renovation. The pros can help you design a unit that complements your existing home and meets your specific needs. Enjoy the added functionality and financial advantages.
Are there any ADU grants available in Westminster, Colorado?
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: Countryside, Westminster West, Westminster East, Walnut Creek, Sheridan — and every surrounding area.
Areas we serve
Browse by state, then city.