Garage Sale Permits: San Mateo vs South San Francisco
How do garage sale permits rules compare between San Mateo, CA and South San Francisco, CA?
San Mateo and South San Francisco have similar restriction levels.
San Mateo, CA
San Mateo County
San Mateo does not require a specific permit for residential garage sales. Sales must comply with sign regulations and not create nuisance conditions. Signs advertising garage sales must comply with the city's sign code (Chapter 25).
View full San Mateo rules →South San Francisco, CA
San Mateo County
Unincorporated San Mateo County does not require a permit for occasional residential garage/yard sales. Sales are treated as incidental residential activity, not commercial operations, so long as they remain occasional and comply with County Code frequency and sign rules. Merchandise must be personal property, not goods purchased for resale — the latter would require a business license and zoning clearance as a home business or retail operation.
View full South San Francisco rules →Key Facts Comparison
| Fact | San Mateo | South San Francisco |
|---|---|---|
| Permit Required | No | - |
| Sign Rules | SMMC Chapter 25 | - |
| Location | Items on property only | - |
| Sign Removal | Promptly after sale ends | - |
| Enforcement | Code Enforcement — 650-522-7200 | - |
| Permit | - | Not required (occasional) |
| Merchandise | - | Personal property only |
| Frequency | - | 2-4 per year typical |
| Business Ban | - | No ongoing retail |
| HOA | - | May have separate rules |
Highlighted rows indicate differences between cities.
San Mateo FAQ
Do I need a permit for a garage sale in San Mateo?
No. San Mateo does not require a garage sale permit. Sales must comply with sign regulations and not create nuisance conditions.
Can I put signs on street corners?
Signs may not be placed on public property, utility poles, or traffic signs. Place signs on your property during the sale and remove them promptly after.
South San Francisco FAQ
Do I need to collect sales tax on garage sale items?
Occasional sales of household personal property (2 or fewer sales per 12 months) are exempt from California sales tax per CDTFA Publication 31. If you hold more frequent sales or sell items you acquired for resale, you must register for a seller's permit with CDTFA and collect 9.375% combined sales tax (San Mateo County rate).
Are estate sales treated the same as garage sales?
Occasional family estate sales of inherited household property are generally allowed without permit. Commercial estate-sale companies operating on residential property may need a business license and zoning clearance; check with Planning at (650) 363-4161 if you're hiring a professional estate-sale firm.
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