San Luis Obispo County, CA Fire Regulations: Wildfire Zones (2026)
Key Facts
- Building Standard
- CBC Chapter 7A
- Roof
- Class A fire-rated
- Vents
- Ember-resistant required
- Windows
- Dual-pane, tempered
- Map Lookup
- CAL FIRE FHSZ Viewer
Summary
SLO County contains extensive High and Very High Fire Hazard Severity Zones, especially in coastal canyons, the Santa Lucia range, and inland chaparral. New construction must comply with California Building Code Chapter 7A wildland-urban interface standards including Class A roofing, ember-resistant vents, and dual-pane tempered glass.
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 Regulations Title 14, Section 1280 and California Government Code 51175-89. Frequently Asked Questions FAQ Document (PDF) FAQ Document (PDF) (Spanish) Examples of FHSZ State Minimum Mitigation Requirements Explore Fire Hazard Severity Zones The Fire Hazard Severity Zone (FHSZ) maps are developed using a science-based and field-tested model that assigns a hazard score based on the factors that influence fire likelihood and fire behavior.
Full Breakdown
Cal Fire designates Fire Hazard Severity Zones across SLO County's State Responsibility Area, with vast High and Very High zones covering the Santa Lucia Mountains, Los Padres National Forest interface, Cambria pine forest, See Canyon, and the Nipomo Mesa. Under California Building Code Chapter 7A and Title 16 of the County Code, new construction and major remodels in these zones require: Class A fire-rated roofing, ember-resistant attic and crawlspace vents, dual-pane glass with at least one tempered pane, ignition-resistant exterior walls, and enclosed eaves. The SLO County Fire Department reviews building plans for WUI compliance. Owners can look up their zone designation using the CAL FIRE Fire Hazard Severity Zone Viewer.
Violations & Fines
Building without required WUI features is a building code violation subject to stop-work orders, mandatory correction, and administrative penalties. Insurance carriers may also decline coverage on non-compliant homes.
Frequently Asked Questions
How do I find out if my SLO County property is in a wildfire zone?
What construction rules apply in High FHSZ?
Sources & Official References
Other rules in San Luis Obispo County
California rules heatmap·Compare San Luis Obispo County to another location·View the California fire regulations overview
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