Accessory dwelling unit — Denver, CO | AccessoryDwellingUnit Services

Looking for accessory dwelling unit in Denver, CO? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Denver and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.

Frequently asked in Denver

What are the zoning rules for ADUs in Denver?

What's the most expensive part of building an ADU in Denver?

The most expensive part of building an ADU in Denver often includes site preparation, foundation work, and utility connections. Depending on your lot's condition and existing infrastructure, these foundational elements can represent a significant portion of the cost. The complexity of the design and chosen materials also impacts the overall expense. Getting a detailed quote from a pro is key.

How do I get an ADU permit in Denver?

What does 'homes with mother-in-law suites' mean in Denver?

In Denver, 'homes with mother-in-law suites' refers to properties that have a separate, self-contained living space attached or detached from the main house. These suites, often built as accessory dwelling units (ADUs), provide private accommodations for family members or can be rented out. They are a popular way to add value and flexibility to Denver residences.

What are the benefits of a detached accessory dwelling unit in Denver?

A detached accessory dwelling unit (DADU) in Denver offers excellent privacy and autonomy. It can serve as rental income, a guest house, or a home office, all while being separate from your main residence. DADUs can be designed to complement your home's style and add significant value to your property. They are a versatile addition for Denver homeowners.

How much does it cost to build an ADU in Denver?

Also serving nearby: Aurora · Thornton · Centennial · Westminster · Lakewood

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

716,577residents

4,681per sq mile

8ZIP codes served

Serving all of Denver — population 716,577; about 4,681 residents per square mile across 153.1 sq mi. ZIP codes covered include 80201, 80202, 80203, 80204, 80205, 80206, 80207, 80208.

Neighborhoods served in Denver: Capitol Hill, Uptown, LoDo, Wash Park, Highlands, City Park West — and every surrounding area.