Glossary

Actual cash value ACV

Replacement cost minus depreciation. In a total loss an ACV settlement can fall far short of what rebuilding costs, which is why replacement-cost cover matters more than the headline limit.

Additional living expenses ALE

Cover for the cost of living elsewhere while your home is uninhabitable. In wildfire this is frequently the clause that matters most, because rebuilds run to a year or more and smoke damage alone can make a standing house unlivable.

Admitted carrier

An insurer licensed and rate-regulated by the state, backed by the state guaranty fund if it becomes insolvent. The standard market.

Aspect

The compass direction a slope faces. South and west-facing slopes dry out faster and carry more fire risk than north-facing ones at the same elevation.

Class A roof

The highest fire-resistance rating for roofing assemblies. Since the roof is the largest surface exposed to ember fall, a wood shake roof in fire country is close to an uninsurable feature.

Containment %

The share of a fire's perimeter secured by a control line. Not the share extinguished — a fire at 60% containment is still actively burning on the other 40%.

Deemed non-renewal

Where an insurer declines to continue cover past the policy expiry date. Distinct from cancellation, which ends cover mid-term and is far more restricted.

Defensible space

The managed buffer between a structure and surrounding vegetation, divided into zones by distance. Its purpose is to break the continuity of fuel and give responders somewhere to stand.

Difference in conditions DIC

A policy bought alongside a limited one — typically a FAIR Plan — to cover what the primary excludes: liability, theft, water damage. The standard pairing for high-hazard homes in California.

Dwelling fire policy DP-1 / DP-2 / DP-3

A narrower product than a homeowners policy, used for rentals, second homes and properties that do not qualify for an HO-3. DP-1 is basic named perils on an actual cash value basis; DP-3 is open perils at replacement cost.

Ember cast

Wind-carried burning material thrown ahead of a fire front, often more than a mile. Post-fire investigations repeatedly find it, not the flame front, to be what ignites most destroyed homes.

FAIR Plan

Fair Access to Insurance Requirements. A state-created insurer of last resort for properties the standard market declines. Typically fire and smoke only, with capped limits, and meant to be temporary.

Fire Hazard Severity Zone FHSZ

California's legal classification of land into Moderate, High and Very High hazard. It carries building standards, defensible space obligations and disclosure requirements on sale — and the maps are periodically redrawn.

Fire weather

The short-term meteorological conditions that drive fire behaviour: low relative humidity, high wind, high temperature and cured fuels. The layer that changes daily, as against static hazard.

Firewise USA

A national recognition programme for neighbourhoods that complete collective wildfire risk reduction. Some carriers credit it, which can be worth more than any single parcel improvement.

Fuel load

The quantity of burnable vegetation in an area. Long fire-suppression histories tend to increase it, which is why areas with few recorded fires can carry more hazard than the record suggests.

Guaranteed replacement cost

Cover that pays to rebuild regardless of the policy limit. Extended replacement cost is the more common middle ground, paying an agreed percentage above the limit.

HO-3

The standard homeowners policy form in the United States. Open perils on the structure, named perils on contents. Fire is covered as a peril, and wildfire is not treated separately from a kitchen fire.

Ladder fuel

Vegetation that lets a ground fire climb into tree crowns — typically shrubs and low branches beneath taller trees. Removing it is a core part of Zone 1 work.

Mitigation credit

A rating reduction for documented wildfire risk reduction. Several states now require admitted insurers to account for it. Evidence is the operative word: dated photographs, invoices and where available third-party inspection.

National Risk Index NRI

FEMA's county and census-tract dataset estimating expected annual loss from eighteen hazards including wildfire. The hazard layer behind our score.

Red Flag Warning

A National Weather Service product issued when fire weather conditions are occurring or imminent. It signals that any ignition is likely to spread rapidly, not that a fire exists.

Surplus lines E&S

Insurers not rate-regulated by the state and not backed by the guaranty fund, permitted to write risks the admitted market declines. Where high-hazard homes usually end up, accessible only through a broker.

Wildland-urban interface WUI

Where development meets undeveloped wildland vegetation. The zone in which nearly all structure loss from wildfire occurs, and the focus of most building and defensible space regulation.

Zone 0

The first five feet around a structure, where everything should be non-combustible rather than merely fire-resistant. The highest-value mitigation work available, and the cheapest.

Definitions are general and for orientation. Policy wordings, state regulations and FAIR Plan rules vary by state and change — your own documents and a licensed agent in your state govern.