Time Restrictions: San Mateo vs South San Francisco
How do time restrictions 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 codify specific hours for garage sales. Sales should be conducted during reasonable daytime hours. Noise from setup or operations before 7 AM or after 10 PM may violate the noise ordinance (Chapter 7.30).
View full San Mateo rules →South San Francisco, CA
San Mateo County
Unincorporated San Mateo County garage sales must stay within reasonable daylight hours, typically 8 AM to 6 PM, and remain within the Chapter 4.88 Noise Control exterior limits at the property line. Friday-Sunday weekend sales are most common. All merchandise, tables, and signs must be removed from public view at the end of each sale day. Leaving items outside overnight can trigger property blight/nuisance enforcement.
View full South San Francisco rules →Key Facts Comparison
| Fact | San Mateo | South San Francisco |
|---|---|---|
| Specific Hours | Not codified | - |
| Practical Range | Sunrise to sunset | - |
| Night Noise Limit | 50 dB (10 PM–7 AM, Zone 1) | - |
| Amplified Sound | SMMC §7.30.080 applies | - |
| Enforcement | Complaint-based | - |
| Typical Hours | - | 8 AM to 6 PM |
| Common Days | - | Friday through Sunday |
| Noise Cap | - | Chapter 4.88 applies |
| End-of-Day | - | Remove everything from view |
| Sign Removal | - | Within 24 hours |
Highlighted rows indicate differences between cities.
San Mateo FAQ
What hours can I hold a garage sale in San Mateo?
No specific hours are codified. Sales should be during reasonable daytime hours. Noise before 7 AM or after 10 PM may violate the noise ordinance.
Can I use a speaker or megaphone at my garage sale?
Amplified sound must comply with SMMC Section 7.30.080. Handheld amplified equipment cannot exceed 10 watts.
South San Francisco FAQ
Can I start my sale at 6 AM for 'early bird' shoppers?
Not advisable. Chapter 4.88 Noise Control sets the daytime period starting at 7 AM (residential areas), and setup or customer traffic before then can trigger neighbor complaints and $100-$500 noise infraction fines. Most established sales start at 8 or 9 AM and explicitly state 'no early birds.'
Where can I legally post garage sale signs?
Signs are generally allowed on your own property and, by courtesy/custom, at nearby intersections, but NOT attached to utility poles, traffic signs, or street signs (CA Business & Professions Code §5499 and County Code). Private property sign posting requires property owner permission. All signs must be removed within 24 hours of sale end.
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