What is defensible space and why is it required?

Defensible space is the maintained buffer of reduced fuel between your home and surrounding wildland. California Public Resources Code 4291 requires 100 feet of defensible space for properties in State Responsibility Area lands and Very High Fire Hazard Severity Zones, which includes most San Bernardino County foothill parcels. It is the single most effective property-level wildfire mitigation measure.

How is the 100-foot zone measured?

The 100 feet is measured horizontally from the furthest exterior point of any structure — including decks, attached garages, and outbuildings — outward in every direction. On sloped lots, requirements often extend further on the downhill side because fire moves uphill faster.

What's the difference between defensible space and weed abatement?

Weed abatement under San Bernardino County Code 23.0301 is the annual cutting of weeds, grass, and tumbleweeds. Defensible space under PRC 4291 is broader — it includes weed abatement plus ladder fuel reduction, tree spacing, dead vegetation removal, and Zone 0 hardening. Most VHFHSZ properties need both.

Do I need this if my property is small?

Yes. PRC 4291 applies regardless of lot size if the property sits in a Very High Fire Hazard Severity Zone. The 100-foot zone may extend onto neighboring property — California law allows you to maintain defensible space across property lines with consent.

How often does defensible space need to be maintained?

California treats defensible space as a year-round requirement. Most homeowners need at least one major clearing in spring and one mid-season touch-up. Properties with heavy growth or in active fire-season counties often benefit from quarterly maintenance contracts.

What happens during a CAL FIRE inspection?

A CAL FIRE inspector walks the perimeter, evaluates Zones 0, 1, and 2 against PRC 4291 standards, and either issues a passing report or an LE-100 notice listing specific corrections required. You typically have 30 days to comply before reinspection and possible referral for citation.

Defensible Space Clearing in San Bernardino County

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Overview

What Is Defensible Space?

Last updated: May 8, 2026

Regulatory information on this page is provided for general guidance and may not reflect the most current requirements. Always verify specific deadlines, fees, and compliance procedures with CAL FIRE (fire.ca.gov), San Bernardino County Fire Protection District, or your local fire authority before making compliance decisions.

Defensible space is the buffer zone between a structure and the surrounding wildland vegetation. It is required by California Public Resources Code 4291 for every property in a Very High Fire Hazard Severity Zone (VHFHSZ) — which covers most foothill parcels in San Bernardino County.

California organizes defensible space into three zones. Zone 0 is the first 0–5 feet around the home and must be ember-resistant. Zone 1 spans 5–30 feet and is the maintained landscape zone — vegetation kept short, well-spaced, and well-irrigated. Zone 2 runs 30–100 feet and is the reduced fuel zone where grasses are cut to 4 inches, ladder fuels are removed, and tree canopies are spaced.

Properly maintained defensible space dramatically improves a home's chance of surviving a wildfire and is increasingly required by California insurance carriers as a condition of renewal.

Sources: California Public Resources Code 4291

Triggers

When do you need defensible space clearing?

Annual VHFHSZ compliance

Every property in a Very High Fire Hazard Severity Zone is required to maintain 100 feet of defensible space each year.

CAL FIRE LE-100 notice

Received a CAL FIRE Notice of Defensible Space Inspection? You typically have 30 days to comply before reinspection.

County abatement notice

San Bernardino County issues 30-day Notices to Abate under Code 23.0301. Failure leads to forced abatement at premium rates plus liens.

Insurance documentation

Your carrier is requesting documented mitigation work to keep coverage in force or restore non-renewed coverage.

Scope

What's included in defensible space clearing?

Vegetation removal across Zones 1 and 2
Weed and grass clearance to 4 inches or less
Dead and dying tree removal
Ladder fuel reduction (low branches, brush under trees)
Tree canopy and shrub spacing per CAL FIRE requirements
Combustible debris and brush pile removal
Hauling and legal disposal of all material
Written compliance documentation for CAL FIRE, County, and insurance

Pricing

How much does defensible space clearing cost in San Bernardino County?

Pricing varies based on lot size, slope, and vegetation density. Quarter-acre to half-acre lots with moderate vegetation generally fall in the lower range. Larger properties or those with steep slopes and heavy chaparral can run significantly higher. Free on-site estimates are available from vetted contractors before any work begins.

Defensible space scope tiers
Scope Tier	Typical Property Type	Industry-Standard Cost Range	Typical Duration
Basic Compliance	Small residential lot, minor issues	Lower hundreds to ~$1,500	1–2 days
Standard Compliance	Mid-sized residential, multiple issues	$1,500 – $4,000	2–4 days
Comprehensive Defensible Space	Larger property, full 100-foot zone	$4,000 – $10,000+	4–7 days
Mountain / Steep-Slope Properties	Slope-built homes, access challenges	Premium pricing	Variable

Ranges reflect industry-standard estimates. Actual costs depend on lot size, slope, vegetation density, access, and the specific scope on your CAL FIRE or County notice.

Process