Adu permit — Denver, CO

Last updated: September 24, 2026

Are you looking to add an accessory dwelling unit (ADU) in Denver and worried you might confuse it with a simple garage conversion? It's a common mix-up, but ADUs are designed as complete, independent living spaces, not just repurposed structures. With Denver's density of 4681 people per square mile, maximizing your property's utility is a smart move. You might be thinking about the specific permits required for an ADU in Denver, which can seem complex. Or perhaps you're concerned about how the construction process will impact your daily life. What are the key differences between a proper ADU and other additions? And how do you ensure your project complies with Denver's unique building codes? These are all important questions that deserve clear, direct answers. We know you want to make the right decisions for your home and investment. That's why we make it easy to get reliable information tailored to Denver. Don't let confusion about ADU regulations slow you down. We're here to help you navigate the process and understand your options for adding a functional living space. Let's start the conversation about your Denver ADU project.

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

Obtaining an ADU permit is the legal process of getting city approval for your secondary structure. You need this documentation before any construction begins to ensure your build meets local safety and zoning codes. The permitting phase can involve architectural plans and engineering reviews. Fees and design costs for this stage typically add several thousand dollars to your project. Exact pricing confirmed free on the call.

Frequently asked in Denver

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

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: LoDo, Capitol Hill, Uptown, Highlands, Cherry Creek, RiNo — and every surrounding area.