Larimer County, CO Fence Regulations: Height Limits (2026)
Key Facts
- Support posts
- 6x6, max 6 ft on center
- Post depth
- Minimum 3 feet deep
- Horizontal rails
- 2x6, max 24 in on center
- Max height (prescriptive)
- 9 feet
- Outside these rules
- Engineer-stamped plans required
Summary
For permitted fences built without custom engineering, Larimer County sets prescriptive construction standards: 6x6 support posts at a maximum 6 feet on center and at least 3 feet deep, 2x6 horizontal rails at a maximum 24 inches on center, and a maximum 9-foot height.
Without engineering, the following prescriptive rules apply: 6x6 support posts at 6 feet maximum on center, minimum 3 feet deep (use preservative-treated or decay-resistant wood); 2x6 horizontal support rails at 24 inches maximum on center; Maximum 9-foot fence height.
Full Breakdown
When a fence needs a building permit, the county allows a prescriptive path so most homeowners avoid hiring an engineer. Without engineering, the following apply: 6x6 support posts at 6 feet maximum on center, set at least 3 feet deep using preservative-treated or decay-resistant wood; 2x6 horizontal support rails at 24 inches maximum on center; and a maximum 9-foot fence height. Any fence design that falls outside these prescriptive rules requires plans stamped and sealed by a licensed Colorado professional engineer. Fences accessory to commercial uses must first be reviewed by Planning staff with engineer-stamped plans, and the local fire department may add requirements.
Violations & Fines
A permitted fence that deviates from the prescriptive standards without stamped engineering can fail inspection and require redesign or re-permitting.
Frequently Asked Questions
How deep do fence posts need to be?
What if my fence design is unusual?
Sources & Official References
Other rules in Larimer County
How Larimer County compares: Cities That Allow the Tallest Residential Fences·Compare Larimer County to another location·View the Colorado fence regulations overview
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