Most homes lost in a California wildfire do not burn from a wall of flame — they ignite from wind-blown embers that land on a roof, slip through a vent, or catch combustible material against the foundation. Hardening a home targets those ignition points, and in the wildland-urban interface (WUI) it increasingly decides whether a property is insurable at all.
The building envelope is where Chapter 7A focuses. A Class A roof, ember- and flame-resistant vents (1/16- to 1/8-inch mesh or baffled designs), noncombustible siding, dual-pane tempered windows, and enclosed eaves all cut the ways embers get in. Decks and fences attached to the house matter too — a wood fence is a wick that leads fire straight to the wall.
Defensible space works outward in zones. Zone 0 (0–5 ft) should be ember-resistant: no bark mulch, no shrubs against the wall, nothing combustible under the deck. Zone 1 (5–30 ft) is lean, clean, and green — spaced plantings, trimmed trees. Zone 2 (30–100 ft) reduces fuel continuity so a ground fire cannot build momentum.
For a buyer, hardening is both a safety and a money question. California’s Safer from Wildfires rules require insurers to credit specific mitigations, and a hardened home is far more likely to keep standard-market coverage instead of landing on the FAIR Plan. An inspection should note the roof class, vent type, and Zone 0 condition — not just the roof’s age.