Fence Regulations in O'Fallon, MO (2026)
4 verified fence regulations for O'Fallon, Missouri, sourced directly from the municipal code and official government pages.
Verified from official government sources
Height Limits
O'Fallon limits fences and decorative posts to six feet, six inches under Zoning Code Section 400.273(C), bans fencing forward of the required front setback line, and keeps fences out of the twenty-five-foot corner sight triangle so drivers can see cross traffic.
O'Fallon Fence Height Capped At 6 Feet 6 Inches
Some RestrictionsO'Fallon Code § 400.273(C)(1), (C)(7)
1. The maximum height for fencing, accompanying structures and decorative posts is six (6) feet, six (6) inches, except as noted elsewhere within this Section. ... 7. Fencing/decorative posts may not be placed within the designated twenty-five (25) foot sight triangle or be erected or constructed in any manner that otherwise impedes vehicular vision.
Fence Permit Requirements
Any fence or decorative post thirty inches or taller needs a City permit before construction starts, under Zoning Code Section 400.273(B). The Administrative Officer issues the permit, inspects for compliance, and enforces a six-month start deadline and one-year completion deadline.
O'Fallon Fence Permits Required At 30 Inches
Some RestrictionsO'Fallon Code § 400.273(B)(1), (B)(3)
1. All fences and decorative posts to be constructed within the City limits that are thirty (30) inches or more in height need to have a permit issued prior to construction. The property owner or his/her authorized agent shall obtain a fence permit from the Administrative Officer. ... 3. Construction shall be initiated within six (6) months of the date of permit issuance and be completed within...
Retaining Walls
O'Fallon requires a permit and an engineer's as-built plans for any retaining wall over 48 inches tall, one that supports a surcharge load, or one that alters drainage. Front-yard walls are capped at 4 feet unless a licensed engineer designs a taller one, and no wall may exceed 6 feet without a guard.
O'Fallon Retaining Wall Height & Permit Rules
Some RestrictionsO'Fallon Code § 405.275
A. A permit is required for all retaining walls that are over forty-eight (48) inches tall in height, measured from the top of the base to the top of the wall or for walls that support a surcharge load or that alter the channelized drainage of any lot or drainage area. For retaining walls requiring a permit, as-built plans are to be prepared by a certified licensed engineer when required by the...
Material Restrictions
O'Fallon prohibits barbed wire, razor wire, hardware cloth, wire mesh and electrified fencing citywide under Zoning Code Section 400.273(D)(2). The sole exception lets barbed wire top security fencing in industrial districts with a conditional use permit and a minimum five-foot, six-inch fence height.
O'Fallon Bans Barbed Wire And Electric Fencing
Significant RestrictionsO'Fallon Code § 400.273(D)(2)
2. Prohibited materials for fencing and decorative posts include, but are not limited to, barbed wire, razor wire, hardware cloth, wire mesh and electrified fencing. a. Barbed wire can be used on security fences in industrially zoned areas, provided the fence has a minimum height of five (5) feet, six (6) inches and the property owner has applied for and received a conditional use permit as out...
Looking for St. Charles County county-wide rules?
County ordinances apply to unincorporated areas and may supplement O'Fallon city rules.
Fence Regulations in St. Charles County →