Defensible Space in California: What It Includes, Laws & Costs (2026)
Defensible space is the buffer of managed vegetation around a building that slows an approaching wildfire and gives firefighters room to work. California Public Resources Code 4291 requires 100 feet of defensible space around structures in fire hazard areas, organized into Zone 1 (0–30 ft) and Zone 2 (30–100 ft); a new ember-resistant Zone 0 (0–5 ft) standard is still in state rulemaking.
What defensible space includes
- Removing dead plants, grass and weeds within 100 feet of structures
- Thinning and spacing shrubs and tree crowns to break up continuous fuel
- Clearing branches away from the roof and chimney
- Zone-by-zone fuel reduction: bare or non-combustible Zone 0, lean Zone 1, reduced Zone 2
- Chipping or hauling away the cleared material
California laws that require it
PRC 4291 is the core requirement: 100 feet of defensible space (or to the property line) around any structure in a fire hazard area. AB-38 makes it bite at sale time — the seller of a home in a High or Very High Fire Hazard Severity Zone must provide documentation of defensible space compliance. A pending Zone 0 rule — still in state rulemaking — would add an ember-resistant standard for the first 5 feet around homes in Very High zones.
Related guides: AB-38 at home sale · Zone 0 · 2026 wildfire laws
What it costs
Price depends on lot size, slope and how overgrown the parcel is. Annual maintenance of an already-compliant lot is a fraction of a first-time clearance of neglected acreage, which can run into the thousands. Nearly all contractors quote after a site visit or photos — exact bids over the phone are rare.
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