Cupertino, CA Sign Regulations: Window Signs (2026)

Section 19.104.280 governs Temporary Window Signs and works together with the permanent window sign table at Section 19.104.150. Window signs are permitted only in commercial zones, and the combined area of any permanent and temporary window signage cannot exceed 25 percent of the window surface of each storefront bay. The 30-day rule is the dividing line: a sign that stays in the window for less than 30 days is treated as temporary and is not subject to Director review, while a window sign left up for 30 days or more is reclassified as a permanent window sign and must instead comply with Table 19.104.150's permanent sign standards, which require Community Development Director approval and Design Criteria compliance under Section 19.104.220. Table 19.104.150 further breaks out neon window signs at a 4-square-foot cap, disallows perimeter neon window signage, and exempts one 'open' sign under two square feet from the coverage count entirely.