Accessory dwelling unit services

Looking for accessory dwelling unit services in Fort Collins, CO? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Fort Collins 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 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

These services cover the end-to-end process of adding a secondary home to your property. This includes initial zoning checks, architectural design, permit filing, and final construction. You need these services when you want to create a separate living space for family, guests, or as a rental unit, but don’t want to manage the complex legal and structural requirements on your own.

Frequently asked in Fort Collins

What are the disadvantages of ADUs in Fort Collins?

Potential disadvantages of ADUs in Fort Collins might include a reduction in your usable backyard space or increased strain on existing utilities. You should also consider the impact on your property's overall aesthetic and any potential changes to your property taxes. Discussing these with the professionals can help you make informed decisions.

How much does an ADU cost in Colorado?

The cost of an ADU in Colorado, including Fort Collins, varies greatly depending on its size, the complexity of the design, and the quality of materials chosen. Site preparation, such as foundation work or utility connections, can also significantly affect the overall price. A personalized quote from a qualified professional is the best way to get an accurate estimate.

What are the rules for ADUs in Colorado?

Colorado has been encouraging ADU development, and many cities, including Fort Collins, have adopted specific ordinances. These typically cover aspects like minimum lot sizes, setbacks from property lines, and parking requirements. Understanding both the state's intent and Fort Collins's specific municipal codes is crucial for compliance.

Is an ADU allowed in Maryland?

Our services are focused on Colorado, so we don't have specific information regarding ADU regulations in Maryland. ADU laws are highly dependent on the state and local municipality. To determine if an ADU is allowed in Maryland, you'll need to consult with local planning departments or ADU service providers in that specific state.

We do not currently have information on similar grant programs being available in Colorado. It's recommended to check with the City of Fort Collins or Larimer County for any local incentives or programs that might assist with ADU construction costs.

What are the rules for ADU in California?

California's ADU regulations are designed to promote their development by establishing statewide standards and limiting local restrictions. These rules often address minimum unit sizes, owner-occupancy mandates, and streamlined permitting. Fort Collins operates under Colorado state law and its own municipal codes, which may differ significantly from California's ADU regulations. Focusing on local Fort Collins rules is key.

Also serving nearby: Greeley · Longmont · Boulder · Thornton · Westminster

All cities in Colorado →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

170,376residents

2,976per sq mile

8ZIP codes served

Serving all of Fort Collins — population 170,376; about 2,976 residents per square mile across 57.2 sq mi. ZIP codes covered include 80521, 80522, 80523, 80524, 80525, 80526, 80527, 80528.

Neighborhoods served in Fort Collins: Old Town, Drake, Harmony, Cottonwood, Prospect, The Glen — and every surrounding area.