Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in Denver, CO? Call AccessoryDwellingUnit Experts 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 is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.

About this service

The cost to build an ADU varies based on whether you are converting an existing garage or building a new detached structure from the ground up. Factors like foundation work, utility extensions, high-end finishes, and site access all influence the final total. Exact pricing confirmed free on the call.

Frequently asked in Denver

What are the disadvantages of ADUs in Denver?

Potential disadvantages in Denver include the upfront construction cost and the time it takes to get permits. Some neighborhoods might have specific restrictions. You'll also need to consider ongoing maintenance and property taxes. Understanding these factors early is key to a successful project.

How much does an ADU cost in Denver?

The cost of an ADU in Denver can vary widely based on size, materials, and site conditions. Factors like foundation work, plumbing, and electrical connections all play a role. It's best to get a custom quote from a local professional. They can assess your specific needs and provide an accurate estimate.

What are the rules for ADUs in Denver?

Denver has specific zoning regulations for ADUs, including size limits and setback requirements. You'll need to ensure your planned ADU complies with these rules. Local building codes also apply to ensure safety and structural integrity. Consulting with a pro familiar with Denver's ordinances is crucial.

Can I get a grant for an ADU in Colorado?

What is involved in building an ADU in Denver?

What affects ADU cost in Denver?

Key cost drivers for ADUs in Denver include the size and complexity of the design, the quality of materials chosen, and site preparation needs. Foundation requirements, utility hookups, and any necessary demolition also contribute. The specific location within Denver can also influence labor and material costs.

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

All cities in Colorado →

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, LoDo, Cherry Creek, The Highlands, Uptown, Wash Park — and every surrounding area.