Sign Regulations in San Luis Obispo County, CA (2026)
4 rules for unincorporated San Luis Obispo County, California.
Verified from official government sources
Political Signs
San Luis Obispo County treats political signs as a noncommercial message under its content-neutral Sign Ordinance. Sec. 22.20.030.C lets any noncommercial message substitute for a permitted commercial sign with no extra approval, and as a temporary sign a political sign is capped at 120 days a year, 60 consecutive days, 10 feet tall, with area limits of 4 to 32 square feet by land use category.
SLO County Political Signs: No Permit, Capped
Some RestrictionsSan Luis Obispo County Code §§ 22.20.030(C), 22.20.040(B)(1)
C.Message substitution. A non-commercial message of any type may be substituted, in whole or in part, for any duly permitted commercial message; and any non-commercial message may be substituted for any non-commercial message.1.No additional approval required. Such substitution of message may be made without any additional approval, permitting, registration, or notice to the County... 1.Tempora...
Digital Billboards
San Luis Obispo County flatly prohibits billboards and any animated or electronic message sign countywide. Section 22.20.040.C.6 bans permanent freestanding or attached sign structures near an Interstate or State highway that carry advertising leased to anyone other than the site's own operator, and C.2 separately bans any sign with moving, rotating, flashing, or otherwise animated light or components, which rules out digital billboard displays outright.
SLO County Bans Billboards and Animated Signs
Heavy RestrictionsSan Luis Obispo County Code Sec. 22.20.040.C.2, C.6
Animated or moving signs. Signs consisting of any moving, rotating, flashing, or otherwise animated light or component... Billboards. Any permanent sign structure that is located adjacent to an Interstate or State highway, typically constructed of steel, concrete or wood that is freestanding or attached to the side of another structure that contains an advertising space that is leased, rented, ...
Window Signs
San Luis Obispo County allows temporary paper or cloth window signs without a land use permit, but caps their total coverage at 25 percent of the window area. Section 22.20.040.B.14 places window signs on the list of authorized signs exempt from the permit process, provided they stay expendable material and under the coverage limit.
SLO County Window Sign 25% Area Cap
Light RestrictionsSan Luis Obispo County Code Sec. 22.20.040.B.14
Window signs. Temporary window signs constructed of paper, cloth or similar expendable material, provided the total area of such signs shall not exceed 25 percent of the window area.
Freeway-Facing Signs
San Luis Obispo County allows an extra on-site freeway identification sign, up to 125 square feet and 50 feet tall, for commercial and office sites next to Highway 101 or its frontage road. Section 22.20.060.C.3 requires Conditional Use Permit approval first, and the Planning Commission can order the height reduced or increased case by case.
SLO County Freeway Sign Permit, 125 Sq Ft
Significant RestrictionsSan Luis Obispo County Code Sec. 22.20.060.C.3
Freeway identification signs. In addition to the signs allowed by Subsection A., sites located in Office and Professional, Commercial Retail, and Commercial Service land use categories adjacent to Highway 101 or a Highway 101 Frontage Road may be authorized through Conditional Use Permit approval to use an on-site freeway identification sign with a maximum area not to exceed 125 square feet. Th...
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