Accessory dwelling unit companies

Looking for accessory dwelling unit companies in Fort Collins, CO? Call AccessoryDwellingUnit Experts 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 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

These companies provide end-to-end management for property owners looking to add a secondary unit. They typically offer a mix of design, permitting, and construction management services to streamline the project. You need to hire a company when you want a structured, professional approach to the entire build process rather than managing individual subcontractors yourself. They help ensure your unit is built to code, on time, and aligned with your budget goals.

Frequently asked in Fort Collins

What are the disadvantages of ADUs in Fort Collins?

Potential drawbacks in Fort Collins can include the initial cost of construction and the time required for the permitting and building processes. You'll also need to consider how an ADU might affect your existing yard space and overall property layout. However, the long-term benefits are often significant.

How much does an ADU cost in Colorado?

What are the rules for ADUs in Colorado?

Colorado has state legislation encouraging ADUs, but Fort Collins has its own specific ordinances regarding size, height, setbacks, and parking requirements. These local rules ensure ADUs fit well within existing neighborhoods. It's crucial to work with pros familiar with these details.

Is an ADU allowed in Fort Collins?

Yes, Fort Collins permits the construction of accessory dwelling units, provided they meet the city's established development standards. The city supports ADUs as a way to increase housing options. A call to us can help clarify the specific regulations for your property.

How long does it take to build an ADU in Fort Collins?

Building an ADU in Fort Collins involves design, securing permits from the city, and the actual construction phase. Permitting can take several weeks to months, and construction typically ranges from a few months to over half a year. Experienced professionals can help streamline this process.

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, Spring Creek, Harmony Corridor, Drake — and every surrounding area.