St. Peters, MO Building Setbacks & Zoning: Structure Height Limits (2026)

Section 405.130(E) of the St. Peters Municipal Code sets the building height standard for the "R-1" Single-Family Residential District: no building may be erected or enlarged to exceed two and one-half stories, excluding the basement, or thirty-five feet in height. The same two-and-one-half-story, thirty-five-foot ceiling appears for the "R-1(A)" district at Section 405.140(E), and the Public Park Ground "P-1" district at Section 405.120(C) uses identical numbers but allows the Planning and Zoning Commission to approve taller structures. Detached accessory buildings in R-1 are held to a separate, lower limit under Section 405.130(H)(1)(e): one story or fourteen feet, rising to seventeen feet only on lots of eighteen thousand square feet or larger.

Antennas mounted on a roof are capped at fifteen feet above the roofline, and ground-mounted antennas at thirty-five feet, under Section 405.130(H)(1)(g). Flagpoles are limited to twenty feet under Section 405.130(H)(1)(k). The R-1 height section has been amended repeatedly since the 1989 original ordinance, most recently through Ord. No. 8235 in December 2025, but the two-and-one-half-story/thirty-five-foot principal-building ceiling has remained the operative standard throughout those revisions. The Planning, Community and Economic Development Department reviews building permit plans against this limit before construction begins.