Construction hours in San Mateo County, CA — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Construction hours in unincorporated San Mateo County are typically set by permit conditions. Chapter 4.88 noise standards apply to construction activity. Common permitted hours are 7 AM–7 PM weekdays and 9 AM–5 PM Saturdays.
San Mateo County's Chapter 4.88 applies noise limits to all sources including construction. Construction permits may impose specific hour restrictions as conditions of approval. Generally, permitted construction in residential areas should follow similar standards to neighboring cities: weekdays 7 AM to 7 PM, Saturdays 9 AM to 5 PM, and Sundays/holidays restricted. Emergency work is exempt. Equipment must comply with the exterior noise standards of Chapter 4.88. Contact the County Planning & Building Department at (650) 363-4161 for permit-specific conditions.
Stop-work orders for violations. Fines $100 to $500 per occurrence. Repeat offenders may lose permit privileges.
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See how San Mateo County's construction hours rules stack up against other locations.
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