San Jose Municipal Code Title 23 limits permanent window signs in most commercial zones to roughly 25 percent of the window area. Temporary banners, neon, and interior-lit displays count toward overall sign allowance and may need a city sign permit for non-exempt installations.
Under SJMC Title 23, permanent and temporary window signs at San Jose storefronts are regulated as part of the overall sign allowance for the tenant. Most commercial and downtown zones cap permanent window signage at about 25 percent of the window pane area, leaving the rest clear for visibility, public-safety sightlines, and Crime Prevention Through Environmental Design. Neon, LED, and internally illuminated window displays count toward the cap and require a sign permit. Temporary paper signs for sales and seasonal promotions are typically allowed without a permit if they fall within posted limits and are removed promptly. Downtown overlays, historic districts, and design-review zones may impose tighter limits.
Excessive window signage is enforced as a sign code violation under SJMC Title 23 with notice to abate, administrative citations, and daily fines. Repeat violators may have their business sign permit suspended and face Code Enforcement administrative hearings.
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