1 county-level rule, plus city-specific rules for 2 cities in Adams County, Colorado.
Verified from official government sources
Adams County allows one Accessory Dwelling Unit on any legal single-family lot in any zone district under Section 4-03-03-02-01 of the Adams County Development Standards and Regulations. ADUs must be 500-1,500 sq ft (detached cap), max 25 ft tall, with one off-street parking space. There is no owner-occupancy requirement. Adams County aligned its rules in 2025 with Colorado HB24-1152 (effective June 30, 2025) for surrounding subject jurisdictions.
2 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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Adams County Ordinance Hub →