Sonoma, CA Sign Regulations: Window Signs (2026)

20 (Specific Regulations), sets the coverage and duration rules for both permanent and temporary window signs. No window sign, whether painted, applied, or hung inside the glass, may cover more than 20 percent of the aggregate area of a window that faces a public right-of-way. 020(A)(7), a window sign covering less than 10 percent of the aggregate window area facing a right-of-way can instead be handled through the faster administrative review track. 16 SMC. Temporary window signage, such as paper posters or seasonal promotional displays, is capped separately at 90 days of display per calendar year; there is no square-footage carve-out for temporary displays beyond the same 20 percent coverage ceiling.

130, which cap an illuminated window sign at two square feet and count it toward the site's aggregate sign area. 020(C) if it has high visibility in the Plaza or Highway 12 corridor.