Fence Regulations in St. Louis County, MO (2026)

St. Louis County Code §3110.1 / §1110.302.7

Fences, six (6) feet in height or less, may be installed without a building permit. … Fencing located on a corner lot cannot be located within the sight distance triangle. A sight distance triangle is defined as the area of a corner lot bound by the property lines and a line connecting the two (2) points on the property lines thirty (30) feet from the intersection of the property lines. Barbed ...

SLCRO § 1115.101 (adopting IBC § 105.2, Item 4)

New fencing or replacement of existing fencing not more than 7 feet (2134 mm) in height, except when enclosing swimming pools, spas, or hot tubs, in the rear or side yards. Exception: Fences of any height, which utilize electrified components or barbed wire, razor ribbon, and like material are not exempt from permit requirements. See Section 3111 of the International Building Code for permits ...

St. Louis County Code §1115.105.2

A permit is required for any retaining wall that … exceeds three (3) feet in height. … exceeds two (2) feet in height and supports a surcharge load (driveway, pool, or similar structure). … is located at a distance less than or equal to its height from the property line. … has a fence or guardrail on top of the wall and the total height of the wall from the lowest grade to the top of the fence/...

St. Louis County Code § 1115.131 (adopting IBC § 3112.1)

3112.1 Fences. Fences shall be subject to the following requirements: 1.Fencing on a corner lot cannot be located within the site distance triangle.2.A building permit shall be required to erect a new fence or replace an existing fence in accordance with Sections 105 and 109.3.Electrically charged fences are prohibited.4.The use of barbed wire, razor ribbon, and similar type fencing materials a...