Zone 0 Compliance & Ember-Resistant Hardening

Zone 0 is the first 5 feet around any structure, defined by AB 3074 as the ember-resistant zone. It must contain no combustible mulch, no flammable plants, no stored firewood, and no combustible fencing connecting to the home.

Cal Fire and the State Board of Forestry are phasing enforcement in. New construction in Very High Fire Hazard Severity Zones is already affected. Existing structures in VHFHSZs are expected to come under enforcement in 2027–2028. Check the latest CAL FIRE and Office of the State Fire Marshal guidance for the binding date in your area.

Non-combustible hardscape — gravel, decomposed granite, pavers, stone, brick, concrete — and a limited palette of well-irrigated, low-fuel plants spaced away from the home. Combustible mulch (bark, wood chips, rubber) is not allowed.

Wood fencing that physically connects to a structure can act as a wick for fire and embers. Current AB 3074 guidance recommends a non-combustible section (metal or masonry) for the portion of fence within Zone 0 of the home. Full replacement is not always required.

Yes — increasingly so. California insurance reforms and the new Safer from Wildfires standards explicitly recognize Zone 0 hardening. Documented Zone 0 work can support keeping standard-market coverage and qualifying for mitigation discounts under California Department of Insurance regulations.

Some homeowners handle mulch swaps and small plantings themselves. Larger retrofits — fence replacement, irrigation changes, fire-resistant landscape installation — typically warrant a licensed contractor, both for quality and for documentation that satisfies insurance carriers.