Jefferson County lets fences over 42 inches run to the property line between neighboring lots where no street access occurs along that boundary. Corner and multi-frontage lots must keep the fence out of the 55-foot Vision Clearance Triangle so cars can back out safely.
On interior lot lines shared with a neighbor, a fence taller than 42 inches may be placed on the property line. Where property abuts a street, the fence must be set back to meet zoning requirements and preserve visibility. Corner, triple-frontage and driveway situations must maintain the 55-foot Vision Clearance Triangle and a 25-by-25-foot sight triangle at driveways so vehicles backing out are not obstructed. The county does not adjudicate private cost-sharing disputes between neighbors; Colorado's fence-cost and boundary law governs those.
A fence encroaching on a neighbor's parcel or blocking a required sight triangle can be ordered removed; boundary and cost disputes are civil matters between owners.
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See how Jefferson County's neighbor fence rules rules stack up against other locations.
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