St. Peters, MO Sign Regulations: Window Signs (2026)

Section 405.745(D)(6) of the St. Peters Municipal Code governs window signage citywide, in every zoning district where signs of this kind are permitted. The rule measures the 20% ceiling against the whole window's area, and it lumps permanent window signs together with any temporary signs mounted in the same window when totaling that percentage, so a business cannot use a temporary banner to exceed the limit a permanent sign already approaches. Lights around or inside a window, and any flashing or other mechanical contrivance, are barred on a permanent basis unless the City's Administrative Officer approves the display as an architectural element under the City's design-review process.

Electronic window signs get a narrower carve-out: they may change their displayed message no more than four times in a 24-hour period, a slower cycle than the changeable-copy ground signs the same Article allows elsewhere. Merchandise or product displays are excluded entirely from the window sign calculation, so stocked goods placed in a storefront window do not count toward the 20% cap. Because Section 405.745 sits in Article IX, Permanent Sign Regulations, the Administrative Officer designated under Section 405.770 administers and enforces it alongside the rest of the City's sign code, and the Planning, Community and Economic Development Department handles the underlying sign permit review.

Any owner or tenant who exceeds the 20% window-coverage limit or leaves an unapproved flashing display in place is subject to the general sign-code penalty in Section 405.755.