Accessory Structures in Adams County, CO (2026)
3 county-level rules, plus city-specific rules for 1 city in Adams County, Colorado.
Verified from official government sources
ADU Rules
Unincorporated Adams County permits one ADU per single-family home in any zone district. Minimum 500 sq ft; detached units cap at 1,500 sq ft, up to 25 ft tall. A building permit is required and the ADU cannot be sold separately.
Accessory Dwelling Unit (ADU) Rules in Unincorporated Adams County
Some RestrictionsAdams County DSR Sec. 4-03-03-02-01 (Accessory Dwelling Units)
The minimum size for any ADU is 500 square feet. Detached ADUs must be set back 10 feet behind the front structure line. ADUs can be up to 25 feet in height, measured to the roof mid-pitch.
Shed & Carport Rules
A carport is an accessory structure in unincorporated Adams County and must meet the same setback and 35-foot height limits as other accessory buildings. On a manufactured-home lot, one garage or one attached carport is expressly allowed as an accessory use.
Carport Rules in Unincorporated Adams County
Some RestrictionsAdams County DSR Sec. 4-07-02-01-02-02(17)
Accessory uses for a manufactured home on an individual lot or parcel are subject to the accessory building setback requirements of the zone district in which it is located... and limited to the following: a. one (1) garage or one attached carport.
Tiny Homes
A single manufactured or tiny dwelling may serve as a single-family home on an individual lot in any residential zone that allows single-family homes, but it must be no more than 5 years old at siting, at least 864 sq ft, and installed on a permanent foundation.
Tiny Homes and Manufactured Dwellings in Unincorporated Adams County
Some RestrictionsAdams County DSR Sec. 4-07-02-01-02-02
At the time of siting, the unit is no more than five (5) years old. The unit is comprised of two (2) or more fully enclosed parallel sections not less than twelve (12) feet wide by thirty-six (36) feet long (producing a dwelling unit with a minimum of eight hundred sixty-four (864) square feet).
Accessory Structures by City in Adams County
1 cities in Adams County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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