Glossary

Defensible space

The managed buffer of trimmed, thinned and cleared vegetation around a house that slows a wildfire and gives firefighters room to defend the structure.

Also called: fire buffer, wildfire clearance, vegetation clearance, Zone 0, ember-resistant zone

Defensible space is the zone around a house where you reduce what a wildfire can burn. It does not mean bare dirt. It means mowed grass, no dead plants, shrubs spaced apart, limbs trimmed away from the ground and roof, and no needles, leaves or firewood against the walls, with the most intensive work closest to the house.

California shows how the rules work. Public Resources Code 4291 requires owners in state responsibility areas to maintain 100 feet of defensible space, though never beyond their own property line. The state describes it in bands: 0 to 5 feet, 5 to 30 feet and 30 to 100 feet. It has also been developing a stricter Zone 0 rule for the first five feet, which bars combustible items such as bark mulch and stored firewood against the structure. Other states, counties and fire districts set their own distances.

The insurance consequences are real. Insurers in wildfire states review aerial imagery or send inspectors, and a house with overgrown vegetation can get a fix-it-by-a-date letter or a nonrenewal. California regulations also require insurers that rate for wildfire to recognize mitigation like clearance in their pricing. Keep dated photos of each season's work. The defensible space and wildfire insurance guide covers inspections, and home hardening for wildfire and insurance discounts explains the building-side measures that work alongside the clearance.

Last reviewed October 10, 2026

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Related terms

Home hardening Upgrades to a house's roof, openings, vents and materials so it resists a specific hazard such as wind, hail or wildfire embers, not just insures against it. Wildfire risk score A number a modeling vendor assigns to a property to estimate its exposure to wildfire, which insurers use to accept, price or decline coverage. Mitigation credit A premium discount for building features shown to reduce storm or wildfire damage, such as a reinforced roof, impact windows or defensible space. Underwriting guidelines An insurer's internal rules for which homes it will write, which it will decline, and what conditions, limits or surcharges apply to the ones it accepts. Nonrenewal An insurer's decision to end coverage at the end of the policy period by declining to offer another term, as opposed to ending it partway through.

Related guides

Defensible space and wildfire insurance What defensible space and California's new Zone 0 rules require, how insurers inspect and score your vegetation, and what to do if renewal depends on clearing. Extreme heat, drought and your home: what insurance covers Heat and drought are not covered perils, but they feed wildfire, outages and foundation movement. What a standard policy pays, excludes and how to prepare. Home hardening for wildfire and insurance discounts Which wildfire retrofits matter most, what the IBHS Wildfire Prepared Home standard requires, and which measures California insurers must credit. Owning a home in a wildfire area: keeping your coverage Fire is covered. Staying insured is the hard part. What to do before renewal, what a nonrenewal leaves you with, and how FAIR Plans and surplus lines fit. Are trees, shrubs and landscaping covered? A standard HO-3 covers trees, shrubs and lawns for seven named perils, not wind or hail, up to 5% of the dwelling limit and $500 per plant. How it plays out. Wildfire risk scores and how insurers use them How wildfire risk scores are built, how insurers use them to accept, price or drop a home, and what California and Colorado law lets you see and appeal.

Related states

Arizona Arizona home insurance: a competitive market led by State Farm, below-average premiums, wildfire and monsoon risk, no FAIR plan and a one-year suit deadline. Nevada Nevada home insurance: State Farm leads a low-premium market, wildfire drives declines, a 2026 law allows wildfire exclusions, and there is no FAIR plan. New Mexico New Mexico home insurance: State Farm leads, wildfire and burn-scar floods drive nonrenewals, and the FAIR plan now covers homes up to $750,000 at cash value. Oregon Oregon home insurance: premiums rank among the lowest in the U.S., but wildfire is reshaping the market and earthquake coverage must be bought separately.

Related tools

Hurricane and wildfire season insurance checklist A checklist for the insurance side of hurricane and wildfire season: what to do before the season, as a storm or fire nears, and after the event.