Johnson County, IA Fence Regulations: Height Limits (2026)
Key Facts
- Boundary fence height cap
- 6 feet average
- Interior fence height cap
- 8 feet average
- Grade tolerance
- 0.5 ft. above average max
- Front-yard privacy fences
- Must meet primary structure setback
- Fence posts
- Must face parcel interior
Summary
Unincorporated Johnson County caps boundary fences at six feet and interior fences at eight feet, measured on average across the fence run, with no portion allowed to rise more than half a foot above that average even where the ground slopes.
E. Fence Regulations. The following regulations apply to the installation of fencing in all zoning districts. 1. Height Regulations. The following regulations apply to all fences. In all cases, due to grade changes and slopes, no portion of a fence may extend more than one-half (½) foot above the maximum average height. Boundary Fences. Cannot exceed six (6) feet in height on average in any yard. Interior Fences. Cannot exceed eight (8) feet in height on average in any yard. 2. Structural support for fencing shall be facing the interior of the parcel. 3. Privacy Fences. Only allowed as boundary fences in the side and rear yard. Privacy fences are allowed as interior fences in the front and must meet the required front yard setback for primary structures.
Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.
Full Breakdown
The UDO's fence regulations apply to the installation of fencing in every zoning district. Boundary fences, the fences that sit on or near a property line, cannot exceed six feet in average height in any yard, while interior fences located inside the property away from the boundary can go up to eight feet in average height. Because Iowa lots vary in grade, the code accounts for slopes by measuring the average height across the run rather than the tallest point, but it still caps any single portion of the fence at no more than half a foot above that calculated average.
Structural supports and posts must face the interior of the parcel, so the finished side faces neighbors and the street. 5 feet blocks the view. Security fencing required elsewhere in the UDO's specific-use standards is exempt from these height caps and instead follows whatever height was set as a condition of approval.
Violations & Fines
A fence built above the six-foot boundary or eight-foot interior average, or a privacy fence placed in a front yard without qualifying for an exception, is enforceable as a County Infraction under Chapter 8:8. The Zoning Administrator can order the fence lowered or removed, and a first violation carries a civil penalty up to $750, rising to $1,000 for a repeat violation, with each day of noncompliance a separate offense.
Frequently Asked Questions
How tall can I build a fence on my property line in unincorporated Johnson County?
Can I put up a privacy fence in my front yard?
Which way do the fence posts have to face?
Sources & Official References
Other rules in Johnson County
How Johnson County compares: Cities That Allow the Tallest Residential Fences·Compare Johnson County to another location·View the Iowa fence regulations overview
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