Defensible Space Inspection Checklist: What CAL FIRE Actually Looks For

Why this checklist matters

CAL FIRE conducts thousands of defensible space inspections every year across California's State Responsibility Areas under California Public Resources Code 4291. The San Bernardino County Fire Protection District runs a parallel program in Local Responsibility Areas under County Code 23.0301-23.0319. Between the two, every parcel in a fire hazard zone in this county gets walked at least once a year.

Most properties that fail inspection do so for predictable, fixable reasons — combustible mulch in the wrong place, overgrown grass, dead branches, debris piles. None of it is mysterious, but inspectors have a specific order of operations, and missing a single item is enough to trigger a follow-up notice.

A failed inspection puts you on a 30-day compliance window. There is no margin for surprises in that window — vegetation has to be cut, hauled, and reinspected before the deadline, and contractor schedules tighten dramatically as fire season ramps up. The smart move is to walk the property with this checklist before the inspector does.

What follows mirrors what fire prevention officers actually check, in roughly the order they typically check it — perimeter first, then Zone 0, then out through Zones 1 and 2.

Before the inspection: property preparation

When will the inspection happen?

CAL FIRE inspections in Southern California typically run during fire season — roughly May through October, with mountain communities inspected earlier in the cycle because higher-elevation vegetation cures sooner. San Bernardino County's annual abatement program follows a similar timeline and usually publishes notice of inspection rounds at the start of the season.

You generally will not receive a precise appointment. Inspections are conducted from public access points where possible, and inspectors do not need to be escorted around the parcel for most defensible space items.

What documents should you have ready?

If an inspector does have questions, or if you receive a notice you want to dispute, the following documents make the conversation faster:

• Previous compliance documentation if available (last year's pass-off, prior contractor invoices)
• Property survey or parcel map if Zone 1 / Zone 2 boundaries are unclear
• Photo records of completed work, ideally dated
• Contractor invoices itemizing recent clearing or tree work
• Insurance documentation if your carrier has issued mitigation requirements

For mountain parcels, a CAL FIRE Fire Hazard Severity Zone map printout helps confirm whether you sit in a Very High, High, or Moderate zone — the spacing and clearance requirements scale with that designation.

Zone 0 checklist: the first 5 feet

Zone 0 is the ember-resistant zone — the first 5 feet measured outward from any combustible part of the structure. It is the highest-leverage area in the entire defensible space scheme because more homes are lost to ember intrusion than to direct flame contact, per research from the Insurance Institute for Business & Home Safety and the NFPA.

Statewide enforcement of Zone 0 under AB 3074 phases in starting in 2026. Inspectors are already noting Zone 0 deficiencies even in jurisdictions where formal enforcement has not begun. See our AB 3074 Zone 0 explainer for the full requirements.

Vegetation in Zone 0

• No combustible mulch (wood chips, bark, shredded redwood) anywhere in the 5-foot ring
• No flammable plants (juniper, cypress, ornamental grasses, rosemary) directly against the structure
• No vegetation overhanging within 5 feet of walls, eaves, or windows
• Any present plants are well-maintained, well-irrigated, and from fire-resistant species lists

Materials and storage in Zone 0

• No firewood, lumber, or wood piles stored against or under the structure
• No combustible furniture, doormats, jute rugs, or wicker in this zone
• No propane tanks within 5 feet of the structure
• No wood fences or wood gates attaching directly to the building (AB 3074 enforcement phasing varies — but the inspector will note it)
• Trash and recycling carts staged outside the 5-foot ring on inspection day

Structural elements in Zone 0

• Gutters cleared of dead leaves, pine needles, and debris
• Eaves and vents inspected — open vents are an ember-intrusion risk, 1/8" mesh is the current standard
• Decks free of combustible debris underneath; no stored materials in the deck cavity
• No accumulated yard waste piled against the structure
• Crawl space and foundation vents screened

Zone 1 checklist: 5 to 30 feet

Zone 1 is the lean, clean, and green zone. The goal is well-spaced, well-irrigated vegetation with no continuous fuel paths between plants and no ladder fuels that could carry fire from the ground into the canopy.

Vegetation spacing in Zone 1

• Trees with overlapping canopies have been thinned to maintain horizontal separation
• Tree branches do not touch the structure, the chimney, or the roofline
• Tree branches are limbed up at least 6 feet above the ground (limb-up requirement, more on steeper slopes)
• No ladder fuels — no shrubs growing directly under tree canopies that could carry fire upward

Dead vegetation in Zone 1

• All dead grass, weeds, and brush removed
• Dead branches removed from otherwise living trees
• Dead or dying trees removed entirely
• Pine needles, oak leaves, and other dead leaf litter cleared from the ground and roof

Spacing and height requirements

• Shrubs spaced per slope-based requirements (more separation required on steeper slopes)
• Grass and weeds maintained to 4 inches or less in height
• Mulch areas (where allowed outside Zone 0) do not exceed maximum recommended depths
• Single specimen plants and "islands" of vegetation separated by non-combustible material or irrigated lawn

Zone 2 checklist: 30 to 100 feet

Zone 2 is the reduced fuel zone. The objective is not bare ground — native vegetation can stay — but it must be managed so that a fire moving through is closer to the ground, slower, and less intense by the time it reaches Zone 1.

Fuel reduction in Zone 2

• Vegetation thinned per slope and species requirements
• Tree canopy spacing meets minimum horizontal distances for the slope class
• Combustible debris removed (slash piles, brush piles, downed wood)
• Hazard trees identified and removed — leaning, dying, or beetle-killed conifers are common flags in mountain communities

Special considerations for slopes

• Steeper slopes require increased clearance distances (PRC 4291 allows additional clearance beyond 100 feet on steep terrain)
• Slope-related fuel breaks established where required
• No accumulated fuels on the uphill side of the structure — fire runs uphill faster than downhill

Adjacent property considerations

• Property line vegetation evaluated even if the fuel originates next door
• Coordination with neighbors for shared boundary areas (you are responsible for fuel up to your property line)
• Public road or trail margins addressed if applicable

Common reasons properties fail inspection

After enough inspections you start to see the same five issues over and over. None of them are difficult to fix — they are simply easy to overlook on a casual walk-around.

What happens during the actual inspection

A typical defensible space inspection follows a predictable pattern:

1. The inspector arrives, generally without scheduling. Most parcels can be evaluated from publicly accessible vantage points.
2. The inspection itself usually takes 15 to 30 minutes for a residential lot.
3. Specific deficiencies are noted on official forms tied to PRC 4291 (or County Code 23.0301-23.0319 for County jurisdiction parcels).
4. If you happen to be home, the inspector may walk through findings with you in person.
5. A notice is issued listing each specific correction required.
6. The notice provides a compliance window (typically 30 days) and instructions for requesting reinspection.

Inspectors are not adversarial — they want compliance, not citations. A short, polite conversation often resolves borderline items on the spot.

Pass or fail: what comes next

If you pass

• The inspector signs off and no further action is required until next year's cycle
• Compliance documentation is issued — keep it
• Hold on to documentation for insurance underwriting and any future property sale (AB 38 disclosure) requirements

If you fail

• An LE-100 notice (or County Notice and Order to Abate) is issued listing each deficiency
• You typically have 30 days to correct the issues
• Reinspection is required — this is not automatic; you must request it
• See our What to Do If You Got a CAL FIRE Notice guide for step-by-step compliance instructions.

Frequently asked questions

Next steps

The single best move is to walk your property with this checklist before fire season — ideally in March or April — and address anything that would not pass. If the scope is bigger than a weekend's worth of work, request a free walkthrough from a vetted licensed contractor.

For specific service detail, see defensible space clearing, annual maintenance, or browse our service areas.