Wildfire: coverage, risk, and defensible space
Fire is a covered peril — but in wildfire country the real challenges are availability, price, and whether your building can survive an ember storm. Here's how coverage works and how to reduce the risk.
Is wildfire covered by commercial property insurance?
Generally, yes. Fire is a covered peril on standard commercial property forms, so wildfire damage typically follows. The wildfire problem is rarely a coverage-form gap — it's a problem of availability and price. As losses have mounted across the western U.S., admitted carriers have pulled back through nonrenewals and tighter underwriting, pushing risk into the surplus lines market and state residual markets (California's FAIR Plan, for example, has expanded commercial limits to serve businesses that can't find coverage otherwise).
In high wildfire-risk zones, expect sublimits, higher deductibles, tighter underwriting, or placement through surplus lines or a residual market. Confirm exactly how wildfire is treated on your policy — don't assume "fire is covered" means unlimited wildfire coverage in a WUI zone.
Understanding your wildfire risk: the WUI and the Home Ignition Zone
Wildfire risk concentrates in the wildland/urban interface (WUI) — where development meets fire-prone forest, brush, or grassland. In a WUI fire, flames reach beyond natural fuels to ignite structures and their immediate surroundings, and a single fire can expose dozens or hundreds of buildings at once. When that happens, firefighters often can't defend every structure — which is why a building's own resistance matters so much.
Research on how structures ignite points to the Home Ignition Zone (the building plus the space around it) as the decisive factor. Most structures don't ignite from a wall of flame — they ignite from wind-driven embers that land on or near the building, sometimes well ahead of the fire front. That reframes the whole mitigation problem: the goal is to deny embers a place to start a fire.
How to reduce wildfire risk (and improve insurability)
Based on established wildfire-mitigation practice (Firewise / Home Ignition Zone principles), the highest-impact measures fall into three concentric zones around the structure:
- Immediate zone (0–5 ft): the most critical. Keep it free of combustibles — no mulch, dead vegetation, stored materials, or debris against the walls. Clean roofs and gutters of leaf litter. Screen vents to block ember entry.
- Intermediate zone (5–30 ft): create defensible space. Break up vegetation, keep grass short, space trees and shrubs, and remove "ladder fuels" that let fire climb from ground to canopy.
- Extended zone (30–100+ ft): reduce fuel continuity so an approaching fire loses intensity before it reaches the building.
Hardened construction compounds the benefit: ignition-resistant roofing and siding, ember-resistant vents, and enclosed eaves. Underwriters and residual markets increasingly require defensible space and hardening in high-risk areas — so these measures reduce real loss and directly improve availability and terms.
Clearing combustibles from the immediate 0–5 ft around the structure does more, dollar for dollar, than almost any other measure. Embers landing in that zone are what start most structure fires.
The wildfire insurance playbook
If your building is in or near a high wildfire-risk area:
- Start renewals early. Availability is tight; give the market time.
- Document your mitigation. Defensible-space work, hardening, and vegetation management give underwriters reasons to say yes — bring records to submission.
- Expect the market to shift. Coverage may move from admitted to surplus lines or a residual market; a broader difference-in-conditions structure can fill specific gaps.
- Mind insurance-to-value. Rebuilding costs in wildfire regions have risen sharply — underinsurance plus a coinsurance penalty is a devastating combination after a total loss.
Frequently asked questions
Generally yes — fire is a covered peril, so wildfire damage typically follows. But in high-risk zones expect sublimits, higher deductibles, tighter underwriting, or placement through surplus lines or a state residual market. Confirm how wildfire is treated on your specific policy.
The area around a structure kept clear of flammable vegetation and materials so an approaching wildfire has less fuel to reach the building. It's organized into zones — the immediate 0–5 ft being the most critical — and is increasingly required by insurers in high-risk areas.
Research shows most structures ignite not from direct flame contact but from wind-driven embers that land on or near the building — often ahead of the fire front. That's why clearing combustibles from the immediate zone and using ember-resistant construction matter so much.
Yes. Defensible space and hardened construction reduce real loss and are increasingly required by underwriters and residual markets in high-risk zones. Documenting your mitigation can improve availability and terms, though pricing is always determined by underwriting.