7 county-level rules, plus city-specific rules for 2 cities in Jefferson County, Colorado.
Verified from official government sources
In unincorporated Jefferson County, no fence over 42 inches may sit within the required front setback of the zone district or within the County's Vision Clearance Triangle. Taller fences are allowed elsewhere on the lot subject to setback and sight-triangle standards.
Jefferson County Zoning Resolution, Section 2.J (Fences)
No fence over 42" in height can be located within the required front setback of the applicable zone district. No fence over 42" can be located in the County's adopted Vision Clearance Triangle.
No. Permits are not required for fences in unincorporated Jefferson County. A gate across access still needs a Miscellaneous Zoning Permit (approved first by the fire district), and the fence must comply with the Zoning Resolution's height and placement standards.
Jefferson County Planning & Zoning – Placing a Fence on a Residential Property
Permits are not required for fences in unincorporated Jefferson County. This guide is designed to help determine where you can place your fence and define the Vision Clearance Triangle (VCT).
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.
Jefferson County Planning & Zoning – Placing a Fence on a Residential Property (General Rules)
If no access will occur along a portion of property adjacent to a street or road, the fence may go to the property line.
A fence built on top of a retaining wall must count the total combined height of the wall plus the fence, and that total cannot exceed the maximum height allowed in the applicable zone district. Retaining walls over 36 inches high require a permit.
Jefferson County Planning & Zoning – Placing a Fence on a Residential Property (General Rules)
Fences located on top of retaining walls must include the total height of both the wall and fence and cannot exceed the maximum height allowed in the applicable zone district.
Fences on corner lots must comply with the County's Vision Clearance Triangle. Fences over 42 inches must be set back to the sidewalk edge (or 10 feet from the street flowline where no sidewalk exists) along street frontages and keep a 25-by-25-foot sight triangle at every driveway.
Jefferson County Zoning Resolution, Section 2.J.4.c
Fences shall maintain a 25'x25' sight triangle for all driveways, both on-site and off-site, which is measured from the edge of driveway and the flowline of street/road.
For properties in Jefferson County's Wildland-Urban Interface (WUI), fencing within 8 feet of a structure must be built with noncombustible or ignition-resistant materials such as metal, masonry, or tested plastics and composites. Details are in the Wildfire Resiliency Code, Chapter 5.
Jefferson County Planning & Zoning – Placing a Fence on a Residential Property (WUI); Wildfire Resiliency Code Ch. 5
Fencing within 8 feet of a structure is required to be constructed with noncombustible or ignition-resistant building materials. Acceptable materials include, but are not limited to, metal, masonry, and plastics/composites that meet testing requirements.
Outside the wildfire interface, Jefferson County does not restrict fence material types in the Zoning Resolution. Inside the WUI, fencing within 8 feet of a structure must be noncombustible or ignition-resistant, with metal, masonry, and tested composites among the accepted materials.
Jefferson County Planning & Zoning – Placing a Fence on a Residential Property (WUI materials)
Acceptable materials include, but are not limited to, metal, masonry, and plastics/composites that meet testing requirements. See the Jefferson County Wildfire Resiliency Code Chapter 5 for specific details.
2 cities in Jefferson County have their own fence regulations rules. Each link goes to that city's dedicated page with code citations.
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