San Mateo County property maintenance and nuisance provisions apply to garage/yard sales in unincorporated areas: merchandise must be displayed in an organized manner and completely removed from public view at the end of each sale day. Leaving unsold items in the yard, driveway, or curbside between sale days or after the sale ends triggers blight/public nuisance enforcement by County Code Enforcement, with escalating fines for repeat violations.
The County's public nuisance and property maintenance provisions (Title 1 general provisions and the zoning code blight standards) require residential properties to be kept free of visible accumulation of goods, debris, or commercial inventory. Garage sales are treated as a brief, permitted interruption of that standard. During active sale hours, organized displays of household goods are allowed; outside of active sale hours, all tables, racks, display items, and unsold merchandise must be stored inside the garage, house, or in the rear yard out of sight from the public right-of-way. Signs must be removed from all locations within 24 hours of the sale's last day. Properties that develop a recurring pattern of visible merchandise accumulation are prime targets for blight citations and may be referred to the Planning Department for review as an unpermitted commercial/retail use. Yards accumulating recognized Accumulation of Salvaged Materials Not Licensed for Reconstruction (per Zoning Reg. §6500) face Certificate of Abatement proceedings.
Items at curb/yard after sale: blight citation $50-$200 per §1.04, with escalation for repeat violations. Unremoved signs after 24 hours: $25-$50 per sign. Pattern of retail-use accumulation: referral to Planning for unpermitted commercial use, $100-$1,000. Accumulation of salvage/materials: Abatement Proceedings and potential lien.
San Mateo County, CA
Amplified music in unincorporated San Mateo County is regulated by County Code Chapter 4.88 Noise Control, which caps exterior noise at 55-75 dBA daytime and...
San Mateo County, CA
Unincorporated San Mateo County enforces CVC §22651(k) for vehicles on public streets (72 hours) and Ordinance Code Chapter 4.48 for inoperable vehicles on p...
San Mateo County, CA
Unincorporated San Mateo County has no general overnight parking ban on most streets. Specific residential neighborhoods may have permit parking. California ...
San Mateo County, CA
Unincorporated San Mateo County enforces California Swimming Pool Safety Act (H&S Code §115920-115929) and CBC Chapter 31B. Minimum 60-inch barrier, self-clo...
San Mateo County, CA
Unincorporated San Mateo County requires building permits for retaining walls over 4 feet measured from bottom of footing to top of wall, per California Buil...
San Mateo County, CA
Unincorporated San Mateo County allows backyard chickens on residential parcels of at least 2,500 sq ft under the County Zoning Regulations. 2,500 to 7,500 s...
See how San Mateo County's garage sale rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.