St. Charles County, MO Fence Regulations: Height Limits (2026)

415(F)(2) governs fences in residential districts and agricultural subdivisions. Front yard fences are prohibited on interior lots, but corner lots get an exception: a fence facing the side of the principal structure is allowed up to six feet high, set back at least one foot from the street right-of-way line, either because it was erected before January 1, 2010 under that same setback, or because no principal structure in the same block faces that street. Side yards and rear yards both cap at six feet with no requirement that the fence be open or see-through.

Subsection (a)(4) adds a carve-out for masonry pillars paired with ornamental iron fencing: the pillars, including any decorative caps, can run up to twenty-five percent taller than the attached fence and no wider than twenty-four inches. Through lots follow the same rules, but if every principal structure in the block faces the same street and there is no vehicular access on the non-facing side, a fence there can also sit one foot off the right-of-way. 415(F)(1)(b). 415(K): nothing taller than three feet above street grade, fence included, may stand within the triangle formed by the intersecting property lines at points thirty feet from their corner, or within the triangle formed by intersecting street and driveway pavement edges at points ten feet from their intersection, unless the County Engineer or Director of Development Review approves an exception.