St. Charles County, MO Fence Regulations: Neighbor Fence Rules (2026)
Key Facts
- Location allowed
- Side or rear lot line
- Encroachment
- Prohibited onto adjacent property
- Maintenance duty
- Falls on property owner who built it
- Governing code
- UDO Section 405.415(F)(1)
Summary
A fence can sit right on the side or rear property line, but it can't cross onto the neighbor's land, and the owner who puts it up stays on the hook for maintaining it.
A fence may be located on a side or rear lot line, but no such fence shall protrude in full or part on adjacent property or right-of-way. ... Fences shall be maintained by the property owner according to all other codes of St. Charles County.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4863880; v61 updated 2026-05-11; through 05-11-2026).
Full Breakdown
St. Charles County's zoning code lets homeowners build a fence directly on a side or rear lot line, but bars any part of it from protruding onto the adjacent parcel or a right-of-way. The property owner who erects the fence is responsible for keeping it maintained under the county's other codes: there's no shared-cost or joint-maintenance mechanism written into this section, so a fence built on the line remains the builder's upkeep obligation, not a split duty with the neighbor.
Violations & Fines
Encroaching fence sections crossing onto a neighbor's parcel or a right-of-way violate 405.415(F)(1)(a) and can be ordered relocated or removed as a zoning violation; a fence left in disrepair falls to the owner who built it under the maintenance clause.
Frequently Asked Questions
Can I build a fence exactly on my property line with my neighbor?
Does St. Charles County require neighbors to split the cost of a shared fence?
Sources & Official References
Other rules in St. Charles County
Compare St. Charles County to another location·View the Missouri fence regulations overview
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