Defensible Space & Weed Abatement in Contra Costa

Public Resources Code 4291 requires 100 feet of defensible space around structures in State Responsibility Areas and most wildland zones — or to your property line if it's closer. That 100 feet is split into Zone 0 (0–5 ft, ember-resistant), Zone 1 (5–30 ft, lean/clean/green), and Zone 2 (30–100 ft, reduced fuel).

After repeated catastrophic wildfire seasons, many carriers now condition renewal in the Bay Area WUI on documented defensible space, and some have non-renewed policies outright in high-risk areas. Bringing your property to PRC 4291 standard — and keeping photos and an invoice — is increasingly what it takes to stay insurable.

Zone 0 is the critical 0–5 feet right around your home, and it should be ember-resistant: no combustible bark mulch, no firewood stacks, no flammable shrubs touching the siding, and ideally hardscape or bare mineral soil. Embers landing in this zone are the leading way homes ignite, so it gets the strictest treatment.

A typical one-acre home runs roughly $1,000–$4,000 for full 100-foot defensible space. Crews often price by the hour ($100–$250) or by the acre for Zone 2 brush ($100–$500+). Steep terrain, heavy fuel loads, and lots of close-in hand work around structures push costs up.

Not the close-in zones. A mulcher is ideal for thinning Zone 2 brush quickly, but Zone 0 and Zone 1 around the house, decks, fences, and landscaping need careful hand work to protect structures and keepers. The best results come from combining both.