Santa Clara County Title C zoning limits window signs in unincorporated commercial districts to roughly 25 percent of the window area. Larger temporary banners and obstructive signage trigger sign-permit review by the Planning Department.
Unincorporated Santa Clara County commercial zones (CG, CN, and similar) regulate window signs as part of the overall on-premises sign allocation under Title C. Permanent painted, vinyl, or affixed window signs are typically capped at about 25 percent of the glazing area on any single facade so emergency responders and public safety officers retain visibility into the building. Temporary window signs for sales, openings, and seasonal promotions are allowed for limited durations without a permit if they stay within the cumulative cap. Signs that block the upper third of doors or required exits, or that obstruct rated fire-fighting glazing, are prohibited regardless of size.
Excessive coverage can result in a Planning Department code-compliance order, removal of signage, and per-day civil penalties. Repeat violators may also be denied future temporary-sign approvals and business-license renewals.
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