Unincorporated San Mateo County permits temporary garage sale signs under Zoning Regulations §6408. Signs limited to 4 sq ft, posted only during the sale, and prohibited on utility poles or public rights-of-way. Maximum 2 sales per household per year typical.
Temporary garage/yard sale signs in unincorporated San Mateo County are regulated under Zoning Regulations §6408 (temporary signs). Signs may not exceed 4 square feet. They must be placed only on private property with owner permission, never on utility poles, street trees, traffic signs, public buildings, or within the public right-of-way. Signs may be posted no earlier than 24 hours before the sale and must be removed within 24 hours after the sale ends. Off-site directional signs are generally discouraged and can be removed by Public Works. Garage sales themselves are limited to two per calendar year per household under most residential zoning provisions, with each sale lasting no more than 3 consecutive days. Commercial garage sale operations are prohibited in residential zones. Signs must not obstruct sight distance at driveways or intersections.
Signs on utility poles or right-of-way: removed by Public Works, no warning required. Private property violations: verbal warning, then $25-$50 citation. Failure to remove post-sale: $25/day. Exceeding annual sale limit: code enforcement citation.
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