1 county-level rule, plus city-specific rules for 2 cities in Boulder County, Colorado.
Verified from official government sources
Unincorporated Boulder County allows fences up to 6 feet without a building permit under the Land Use Code. Fences over 6 feet require a permit from Community Planning & Permitting, and any fence in a 100-year floodplain needs a Floodplain Development Permit regardless of height.
Boulder County Land Use Department Publication P/28, Fence Requirements (General Permit Requirements)
General Permit Requirements. Building Permits are not required for fences 6 feet in height and under from existing grade (i.e., not on a berm or platform). However, fences of any height in the floodplain require a permit. See Standards for Fencing in a Floodplain on page 2. Fences over 6 feet in height require a building permit for construction, and must meet setback requirements for the zoning...
2 cities in Boulder County have their own fence regulations rules. Each link goes to that city's dedicated page with code citations.
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