What is home hardening?

Making the house itself resistant to ignition — mainly from wind-blown embers — by upgrading the roof, vents, gutters, siding, windows, decks, and the first five feet around the walls. It pairs with defensible space, which manages the vegetation beyond that.

How much does home hardening cost?

The range is wide because the roof dominates: vent upgrades and five-foot-zone work often run a few hundred to a few thousand dollars, while a full roof replacement is a five-figure project. Start with the cheap, high-impact items — vents, gutters, Zone 0 — and let your actual risk drivers set the order.

Does home hardening lower insurance costs?

In California, yes: insurers are required to file discounts for the Safer from Wildfires upgrades, and documented hardening is a major factor in regular insurers being willing to cover a home at all.

Home hardening: the upgrades that actually save houses

Most homes lost in wildfires are lit by wind-blown embers, sometimes from a fire miles away. Hardening is how you take that ignition off the table.

By the TMRW Team · Published September 2, 2026

The short answer

Embers, not walls of flame, destroy most homes — they lodge in vents, gutters, and roof gaps, and ignite the house hours after the front passes.
Hardening means closing those entry points: roof, vents, gutters, siding, windows, decks, and the five feet around your walls — roughly in that order of importance.
In California, the Safer from Wildfires list makes much of this work count twice: it protects the house *and* qualifies for insurance discounts insurers are required to file.

The hardening list, in priority order

1.
Roof: Class A fire rating
The single biggest factor. Composition shingle, metal, and tile roofs rated Class A resist ember ignition; untreated wood shake roofs are why whole neighborhoods burn. If your roof is wood shake, this is the project — everything else is secondary.
2.
Vents: ember-resistant covers
Attic and crawl-space vents are open doors for embers. Ember-resistant vents (or 1/8-inch metal mesh) close them for tens of dollars per vent — the highest protection-per-dollar upgrade on this list.
3.
The first five feet: nothing that burns
The strip touching your walls — often called Zone 0 — should hold no mulch, no shrubs, no stacked firewood, no doormats that burn: gravel, pavers, bare soil. Embers landing here are touching your house.
4.
Gutters, decks, and fences
Clear gutters (or add metal gutter guards), enclose or screen the space under decks where embers collect, and break the fuel path where a wooden fence meets the wall — the last few feet of fence in metal stops a fence fire at the house.
5.
Windows and siding
Dual-pane windows with tempered glass resist radiant heat that shatters single panes; noncombustible siding (stucco, fiber-cement) and six inches of noncombustible material at the base of walls finish the shell.

Common questions

This page is educational. TMRW is not an insurance agent, broker, or producer, and nothing here is insurance advice, a coverage recommendation, or an offer of insurance. Talk to a licensed agent or broker about your coverage.

Sources

Hardening your home: ember ignition and the component-by-component list — CAL FIRE / Ready for Wildfire, accessed 2026-09-02
Safer from Wildfires: the upgrades insurers must reward — California Department of Insurance, accessed 2026-09-02

Keep reading

Defensible space: the 5-foot, 30-foot, and 100-foot zones

California's defensible space rules, zone by zone: the first 5 feet, 30 feet, and 100 feet — what the law requires, what insurers reward, and what actually protects the house.

Wildfire mitigation that insurers actually reward

Not all wildfire mitigation counts the same. The work that protects your home AND your insurability: hardening, defensible space, community programs — and the proof that makes it pay.

How to get off the California FAIR Plan

The step-by-step path off the California FAIR Plan: reduce your home's documented fire risk with the upgrades insurers must reward, prove it, and re-shop the regular market.