Portions of western San Mateo are mapped in CAL FIRE's Fire Hazard Severity Zones. New construction in these areas must meet Chapter 7A of the California Building Code for ignition-resistant construction. The San Mateo Consolidated Fire Department enforces fire hazard zone requirements.
The western hillside areas of San Mateo are mapped within CAL FIRE's Fire Hazard Severity Zones (Moderate to High severity). These areas adjoin open space and eucalyptus groves that present wildfire risk. Properties in these zones must comply with California Public Resources Code Section 4291 defensible space requirements and new construction must meet Chapter 7A of the California Building Code for ignition-resistant construction. Chapter 7A requirements include Class A fire-rated roofing, non-combustible exterior walls within specific zones, ember-resistant vents, tempered glass windows, and fire-resistant landscaping. The San Mateo Consolidated Fire Department reviews building plans for fire zone compliance and conducts ongoing inspections. The flat eastern portions of the city near the bay are not in fire hazard zones.
New construction not meeting Chapter 7A requirements will not receive building permits. Existing properties must maintain defensible space or face fines up to $500/day.
San Mateo, CA
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See how San Mateo's wildfire zones rules stack up against other locations.
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