Colusa County, CA Sign Regulations: Window Signs (2026)

Window signs fall under Article 44-3, Division 44-3.50 (Sign Standards), Section 44-3.50.080 (Signs Allowed with a Permit), which covers permanent business identification signage. Table 44-3.50-1, Business Identification Signs, sets a separate row of standards for each sign type: wall signs, projecting signs, awnings, monument signs, and window signs among them. For a Window Sign, the table caps the maximum area at up to 25 percent of any continuous window area and fixes the maximum height at the top of the window, meaning the sign has to sit in the upper portion of the glass rather than at eye level or the sill.

The table also addresses a common workaround: a business that repeats an identical sign across several storefront windows along the same frontage does not get to count each pane separately. The Other Requirements column for the Window Sign row specifies that identical signs evenly placed in multiple windows along a business frontage are considered a single sign, so the 25-percent cap applies to the whole run of repeated signage rather than to each window individually.

Because window signs sit within Section 44-3.50.080's permit track, rather than the no-permit list in Section 44-3.50.040, installing one as permanent business identification requires an Administrative Permit application to the Zoning Administrator under Section 44-3.50.050, including a site plan, scale drawing, and an inventory of the business's existing signage. A window sign used only as a temporary, five-square-foot new-business identifier is treated separately, under the no-permit provisions of Section 44-3.50.040(B)(3), and does not have to meet the 25-percent table limit.