By Jim Sprouse, Co-founder of Ember Pro | NFPA Certified Wildfire Mitigation Specialist

California has the most comprehensive wildfire regulations in the country. If you own property in a fire-prone area, these laws directly affect what you must do, when you must do it, and what happens if you do not comply.

PRC 4291: The Foundation of Defensible Space

Public Resources Code Section 4291 requires property owners in State Responsibility Areas and Very High Fire Hazard Severity Zones to maintain defensible space extending 100 feet from all structures. It is enforceable law with real consequences:

• Fines up to $20,000 per violation
• Abatement liens on your property
• CAL FIRE can perform the work and bill you
• Insurance cancellation or non-renewal
• Civil liability if non-compliance contributes to fire spread

The 100-foot requirement is organized into three zones. Zone 0 covers 0 to 5 feet. Zone 1 covers 5 to 30 feet. Zone 2 covers 30 to 100 feet.

Zone 1: 5 to 30 Feet

Remove all dead vegetation. Space trees 10 feet apart branch tip to branch tip. Space shrubs at 2 times mature height. Trim branches 6 to 10 feet above ground. No wood chips or bark mulch.

Zone 2: 30 to 100 Feet

Space trees 12 feet apart minimum. Remove all dead trees and branches. Remove shrubs under trees. Create horizontal separation between canopies.

AB 3074: Zone Zero Requirements

Assembly Bill 3074, effective since 2022, created Zone 0. This is the 0 to 5 foot perimeter immediately around your home. Requirements are strict:

• No combustible vegetation of any kind
• No mulch, bark, or wood chips
• No herbaceous plants
• Hardscape only: gravel, pavers, concrete, stone
• No tree branches extending over the roof
• No accumulation of leaves, needles, or debris

Zone 0 is where most ember ignitions occur. CAL FIRE takes violations seriously.

Zone Zero in San Diego

San Diego County enforces Zone 0 through the San Diego County Fire Authority and local fire agencies. San Diego has additional local requirements including specific brush management programs, annual compliance inspections, and mandatory clearance deadlines. Zone zero San Diego enforcement has become increasingly strict following recent fire seasons.

Zone Zero in Los Angeles

After the Palisades and Eaton Fires, enforcement has intensified significantly in LA County. LAFD brush clearance notices carry strict deadlines and increased penalties. Homeowners in Pacific Palisades, Brentwood, Hollywood Hills, Bel Air, Malibu, Topanga, Calabasas, Altadena, and Pasadena face particularly rigorous enforcement.

AB 38: Real Estate Disclosure

AB 38 requires sellers in high fire hazard areas to provide buyers with defensible space compliance documentation, fire hardening status disclosure, and local fire hazard information. Wildfire mitigation is now part of real estate transactions.

SB 872: Insurance Protections After Disaster

• Simplified personal property claims without full itemized lists
• Extended ALE coverage to 24 or 36 months
• Non-renewal moratoriums in affected areas for one year
• Insurers must explain claim denials in writing

Chapter 7A: Building Code Requirements

Chapter 7A establishes construction standards for WUI areas:

• Class A fire-rated roofing
• Ember-resistant vents with mesh no larger than 1/8 inch
• Non-combustible exterior wall assemblies
• Tempered or dual-pane windows
• Enclosed eaves and soffits
• Fire-resistant deck materials

Applies to all new construction in VHFHSZ zones and major remodels.

Enforcement: Who Inspects and What Happens

• CAL FIRE: Inspects in State Responsibility Areas
• Local fire agencies: City and county fire departments
• County building departments: Enforce Chapter 7A for new construction

Failed inspection means a 30-day notice to comply. Non-compliance results in fines, abatement, and liens.

2026 Updates and Trends

• FHSZ maps being updated for current conditions and climate projections
• More inspectors and more inspections statewide
• Insurance regulations tightening
• Post-Palisades Fire reforms accelerating LA County enforcement
• Local jurisdictions adding requirements on top of state law

How to Get Compliant

1. Start with Zone 0. Clear the 0 to 5 foot perimeter. Highest-impact, lowest-cost.
2. Maintain Zones 1 and 2. Follow spacing requirements. Remove dead vegetation.
3. Address home hardening. Screen vents, assess roof, protect eaves and decks.
4. Document everything. Photos, receipts, maintenance records.
5. Schedule annual maintenance. Defensible space is ongoing.

Frequently Asked Questions

What is PRC 4291?

Requires 100 feet of defensible space around structures in fire-prone California areas.

What is Zone 0?

The 0 to 5 foot ember-resistant zone. Noncombustible materials only. Created by AB 3074.

Can I be fined?

Yes. Up to $20,000 per violation under PRC 4291.

Does my property fall under these laws?

If in a State Responsibility Area or VHFHSZ, yes. Check fire.ca.gov.

How often are inspections?

Varies by jurisdiction. Some annually, others before fire season or after complaints.

Do laws apply to renters?

Property owner is responsible, not the renter.

What if I cannot afford compliance?

Some counties offer cost-share programs. Zone 0 can often be done under $1,000.

How does AB 38 affect selling?

You must provide defensible space documentation to buyers.

Next Steps

Check your wildfire risk score then contact Ember Pro for a compliance assessment. We serve San Diego, Los Angeles, and Southern California.

Protect. Defend. Preserve.

References

• California PRC Section 4291
• Assembly Bill 3074 (Zone 0)
• Assembly Bill 38 (Real Estate Disclosure)
• Senate Bill 872 (Insurance Protections)
• California Building Code Chapter 7A
• CAL FIRE Defensible Space Guidelines