How ADU Regulations Work in Colorado

Thanks to Colorado’s new House Bill 24-1152, most Colorado cities and towns are now required to allow ADUs on single-family lots. But zoning, permitting, and design requirements can still vary depending on where you live. That’s where we come in. This page breaks down the key regulations by city, helping you get a clearer picture of what’s possible on your property.

Zoning & Permits

Rules vary by city—some allow detached ADUs, others have restrictions.

Owner-Occupancy

Some cities require homeowners to live on-site, while others do not.

Parking & Size

Extra parking may be needed, and ADUs range from 400-1,200 sq ft.

Height & Land Use

Maximum height and placement depend on local zoning codes.

Colorado ADU Regulations by City

Select your city to view specific ADU guidelines

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Arvada

Aurora

Boulder

Brighton

Broomfield

Castle Rock

Centennial

Commerce City

Denver

Fort Collins

Golden

Highlands Ranch

Lafayette

Lakewood

Lone Tree

Longmont

Louisville

Loveland

Westminster

Wheat Ridge