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St. Charles County, MO Fence Regulations: Fence Permit Requirements (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Permit-exempt height: Fences 7 feet or under
Fence permit fee: $60 or cost-based multiplier
Side/rear yard max height: 6 feet in residential districts
Front yard fences: Prohibited except narrow corner-lot exceptions
Barbed wire/electric fences: Banned in 'R' Districts

Summary

St. Charles County exempts fences up to seven feet from a building permit, but taller fences need one, and all fences must still meet zoning setback and height limits under the Unified Development Ordinance.

These county ordinances apply to unincorporated areas of St. Charles County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

105.2 Work exempt from permit. Exemptions from permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction. Permits shall not be required for the following: Building: ... 2. Fences not over seven (7) feet (2,134 mm) high.

View official code

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

The County's Building Code exempts fences seven feet or shorter from a building permit; anything taller triggers plan review and a $60 permit fee (or cost-based multiplier, whichever is greater) under Section 505.020. Independent of the permit trigger, Chapter 405's Unified Development Ordinance caps residential side- and rear-yard fences at six feet, bars fences in required front yards outright except for narrow corner-lot and through-lot cases, and bans barbed wire and above-ground electric fences in "R" Districts. Corner-lot fences must also clear the sight-triangle requirement.

Violations & Fines

Building a taller-than-7-foot fence without a permit, or placing a fence in a prohibited front yard or over the 6-foot side/rear cap, is a zoning and building code violation enforced by County Code Enforcement, which can order removal or relocation.

Frequently Asked Questions

Do I need a permit to build a fence in St. Charles County?

Only if it's taller than seven feet. Fences seven feet or shorter are exempt from a building permit under the County's adopted Building Code, though they must still meet zoning height and setback rules.

How tall can a fence be in my side or rear yard?

Six feet in residential districts and agricultural subdivisions. Masonry pillars attached to ornamental iron fencing can stand up to twenty-five percent taller, up to twenty-four inches wide.

Can I put a fence in my front yard?

No, front-yard fences are prohibited in residential districts, with narrow exceptions for corner lots and through lots meeting specific right-of-way setback conditions.

Sources & Official References

[1]St. Charles County Code — ecode360

Other rules in St. Charles County

Height LimitsSome Restrictions Retaining WallsSome Restrictions Material RestrictionsSome Restrictions Neighbor Fence RulesSome Restrictions Animal Ordinances: Veterinary Clinic ZoningSome Restrictions Animal Ordinances: Pet Store RulesSome Restrictions Animal Ordinances: Mandatory Spay/NeuterSome Restrictions Animal Ordinances: Exotic PetsHeavy Restrictions Animal Ordinances: Pet LimitsSome Restrictions Animal Ordinances: MicrochippingSome Restrictions

All St. Charles County rules

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