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Fire Regulations in San Mateo County, CA (2026)

4 county-level rules, plus city-specific rules for 3 cities in San Mateo County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of San Mateo County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Fireworks

Possessing, selling, or exploding any fireworks is unlawful in unincorporated San Mateo County unless a Fire Warden permits a supervised public display.

San Mateo County Fireworks Ban

Heavy Restrictions

San Mateo County Ordinance Code § 5.28.030(b)

Except as hereinafter provided, it shall be unlawful for any person to possess, store, to offer for sale, expose for sale, sell at retail or use or explode any fireworks, provided that any Fire Protection District or County Fire Warden shall have power to adopt reasonable rules and regulations for the granting of permits within the geographic area of their responsibility and authority for super...

Brush Clearance

Properties in the Wildland-Urban Interface of unincorporated San Mateo County must maintain defensible space under California Public Resources Code 4291: 100 feet of clearance around structures. CAL FIRE / San Mateo County Fire conducts defensible space inspections, and roadside vegetation must be cleared to specified clearances.

San Mateo County Brush Clearance / Defensible Space (PRC 4291 - 100 ft)

Some Restrictions

Cal. Public Resources Code Sec. 4291 (Defensible Space Around Structures)

4291. (a) A person who owns, leases, controls, operates, or maintains a building or structure in the state responsibility area shall at all times do all of the following: (1) (A) Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line, except as provided in subparagraph (B). The amount of fuel modification necessary sha...

Wildfire Zones

Unincorporated San Mateo County contains Moderate, High, and Very High Fire Hazard Severity Zones, with the Santa Cruz Mountains and coastal hills (La Honda, Pescadero, and similar) at the highest risk. Mapped zones trigger defensible space (PRC 4291), WUI building standards (CBC Chapter 7A), and real estate disclosure.

San Mateo County Wildfire Zones (CAL FIRE Fire Hazard Severity Zones, VHFHSZ in the hills)

Some Restrictions

CAL FIRE Office of the State Fire Marshal - Fire Hazard Severity Zones

What are Fire Hazard Severity Zones? The State Fire Marshal is mandated to classify lands within State Responsibility Areas into Fire Hazard Severity Zones (FHSZ). Fire Hazard Severity Zones fall into one of the following classifications: Moderate High Very High The California laws that require Fire Hazard Severity Zones include California Public Resources Code 4201-4204, California Code of Reg...

Smoke Detectors

Before San Mateo County issues a short-term rental permit in the unincorporated county, the owner must install smoke alarms complying with UL 217 in every bedroom, just outside each bedroom, and on every level including basements and habitable attics, plus UL 2034 carbon monoxide alarms and a fire extinguisher on each habitable floor, under Zoning Regulations Section 8.368.030.

San Mateo County STR Smoke Alarm Rule

Some Restrictions

San Mateo County Zoning Regulations § 8.368.030(i)(i)

i) Building standards. Each short-term rental shall be, and at all times remain, in compliance with all applicable laws and regulations, including but not limited to the County of San Mateo Zoning Regulations and Building Regulations, the California Residential Code, the California Fire Code, the California Health and Safety Code, and the terms of all County-issued permits. In addition, each sh...

Fire Regulations by City in San Mateo County

3 cities in San Mateo County have their own fire regulations rules. Each link goes to that city's dedicated page with code citations.

All San Mateo County ordinances

See every category we cover for San Mateo County: parking, noise, fences, fires, animals, pools, and more.

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