Lee's Summit, MO Sign Regulations: Window Signs (2026)

Section 9.060 of the Unified Development Ordinance flatly prohibits "window sign, exterior" alongside other banned sign types such as pole signs, portable signs, roof signs and snipe signs. The UDO defines an exterior window sign in Section 9.070.B.92 as "any sign posted, painted, placed, affixed to or over the exterior of any window," so anything from a painted storefront ad to a poster taped to the outside pane of a shop window violates the code on sight, regardless of size, message or how long it stays up. There is no coverage-percentage allowance and no permit path around the ban: unlike pillar signs, monument signs or wall signs that get numeric limits under Table 9-3, exterior window signs are not a permitted category at all.

Interior window signs are treated the opposite way. Section 9.050.A.7 exempts "interior signs, including interior window signs" from Article 9 altogether, so posters, sale notices or business signage placed against the inside of the glass carry no coverage limit, illumination rule or permit requirement under the sign article. Section 9.070.B.93 separately defines "window sign, interior" as a sign "posted, painted, placed, affixed to or over the interior of any window," confirming the line is drawn at the glass itself, not at how visible the sign is from the street.

Enforcement runs through the Planning and Development Department. Because exterior window signs sit on the prohibited list rather than the abandoned-sign or illegal-sign categories, Section 9.250.B.1 lets the Director order their immediate removal without the 30-day cure period given to merely abandoned or nonconforming signs elsewhere in Article 9.