Cost of accessory dwelling unit — Denver, CO | AccessoryDwellingUnit Services

Looking for cost of 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

If you're new to the idea of accessory dwelling units, think of them as a smart way to add more usable space to your Denver home without needing to move. An ADU is essentially a separate living quarter built on your property, complete with its own kitchen, bathroom, and sleeping area. This could be a detached backyard cottage, an addition to your existing home, or even a basement conversion in Denver. We get a lot of questions from homeowners here about how ADUs can benefit them. Many are looking for ways to generate rental income, provide housing for family members, or simply increase their property's value. Denver's unique landscape and growing population make ADUs an increasingly popular option. Understanding the process, from initial design to final construction, is key. We're here to demystify it for you. Our aim is to make the journey to building your ADU as smooth as possible. Let us help you discover the potential an ADU holds for your Denver residence. A quick call can start this exciting exploration.

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.

About this service

Building an ADU involves several variables that shift the total investment. Your site conditions, the type of foundation, and the quality of finishes you choose will dictate whether you land on the lower or higher end of the spectrum. Because every lot is unique, we provide a breakdown of your specific project requirements to ensure full transparency. Exact pricing confirmed free on the call.

Frequently asked in Denver

What does an accessory dwelling unit (ADU) mean for my Denver property?

An accessory dwelling unit (ADU) means adding a second, independent living space to your existing Denver property. This could be a detached unit in your backyard or an attached suite. It's designed to be a self-contained home with its own kitchen and bath. ADUs offer flexibility, whether for rental income, family housing, or a home office in Denver.

How can I find local ADU services in Denver?

What are the permit requirements for an ADU in Denver?

What's the best way to find an ADU builder in Denver?

Are there specific ADU regulations for Denver?

What are the benefits of having an ADU?

Having an ADU offers numerous benefits. It can provide a rental income stream, create much-needed space for family members, or serve as a private home office. For homeowners in Denver, an ADU can significantly increase property value and offer greater financial flexibility. It's a versatile solution for various housing needs. We can help you explore these advantages.

What's the cost to build an accessory dwelling unit 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, LoDo, RiNo (River North Art District), Cherry Creek, Highlands — and every surrounding area.