Boulder County sets no general material palette for standard fences in the unincorporated area, but floodplain fences must use approved open designs, and masonry fences must meet International Building Code structural standards. Wildlife-safe materials may be required by Land Use approval.
For ordinary fences under 6 feet, Boulder County's P/28 does not restrict materials such as wood, chain link, or wire. Material rules kick in for specific situations: in the floodplain, fence type is regulated by a table, so open barbed or barbless wire, open pipe or rail, and other open wire, pipe, or rail fencing are allowed, while chain link and solid wood are case-by-case or prohibited in the floodway. Masonry fences and retaining walls must meet the structural design standards of the International Building Code. If a parcel underwent Site Plan Review, wildlife-safe fencing materials and spacings may be conditions of approval.
Using prohibited fence types in a floodway or non-compliant floodplain materials can void a Floodplain Development Permit and require replacement; noncompliant masonry may require engineered redesign.
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