Accessory dwelling unit permit cost — Denver, CO
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
How long does it typically take for ADU construction in Denver?
What are the main requirements for building an ADU in Denver?
Can I get an ADU quote that covers all potential costs in Denver?
What does 'accessory dwelling unit' mean in the context of Denver zoning?
In Denver zoning, an accessory dwelling unit (ADU) refers to a secondary housing unit on a single-family lot. It's a legal way to add extra living space, whether attached or detached. These units must meet specific size and placement regulations set by the city of Denver. The pros can explain how these rules apply to your specific lot.
Are there options for affordable ADUs in Denver?
What are the benefits of adding an ADU to my Denver property?
Who are some local ADU specialists in Denver?
We work with licensed, insured local ADU specialists serving Denver and its surrounding areas. These professionals have a deep understanding of Denver's unique building environment and permit processes. They are experienced in creating functional and attractive ADUs for homeowners. Calling us is the first step to finding the right expert for your project.
Also serving nearby: Aurora · Thornton · Centennial · Westminster · Lakewood
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
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, Sunnyside, Highlands, LoDo, Cherry Creek — and every surrounding area.
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