Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in Denver, CO? Call AccessoryDwellingUnit Direct 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 variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.

About this service

The amount you spend depends on the size of the unit, whether you are building from scratch or converting an existing structure, and the quality of your finish materials. Foundations, utility connections, and local labor rates also play a significant role. We provide exact pricing confirmed free on the call.

Frequently asked in Denver

What are the disadvantages of ADUs in Denver?

Some disadvantages of ADUs in Denver can include potential impacts on existing property values, increased utility usage, and the need for careful planning regarding parking and access. You'll also want to consider how it affects your current yard space. Discussing these concerns with a pro can help you weigh the pros and cons.

How much does an ADU cost in Denver?

The cost of an ADU in Denver varies significantly based on size, design complexity, materials, and site preparation needs. Factors like foundation work, utility hookups, and finishes will impact the final price. Getting a personalized quote is the best way to understand potential costs for your specific project and location.

What are the rules for ADUs in Denver?

Denver has specific zoning regulations for ADUs, including requirements for lot size, setbacks, and the number of units allowed per property. You'll need to ensure your proposed ADU complies with these rules. A professional can help navigate these regulations and ensure your project meets all city requirements.

Is an ADU allowed in Denver?

Yes, accessory dwelling units are allowed in Denver, but there are specific regulations and guidelines you must follow. These rules are designed to ensure ADUs integrate well into existing neighborhoods and meet safety standards. Confirming your property meets these requirements is a crucial first step.

How do I get started with an ADU 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

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, Congress Park, Belcaro, Cheesman Park — and every surrounding area.