Zone Zero is coming to San Diego: what around your home needs to be checked

Zone Zero is the first five feet around your home, and California is making it a regulated defensible space zone for the first time. On August 19, 2026, the California Board of Forestry and Fire Protection approved the final draft of statewide Zone 0 regulations by an 8-0 vote. The regulation still needs to complete review by the Office of Administrative Law and be filed with the Secretary of State before it becomes effective statewide.

But San Diego isn't waiting. The City of San Diego has already adopted Zone 0 under San Diego Municipal Code Section 512.0604, with requirements taking effect for new structures on February 28, 2026, and existing structures targeted for compliance by February 28, 2027.

Here's what that means in plain language: the area immediately surrounding your home (within five feet of every wall, deck, stairway, and attached structure) needs to be free of combustible materials. No wood mulch touching the foundation. No firewood stacked against the wall. No dead vegetation within arm's reach of the building. No combustible fencing attached to the structure. The goal is to eliminate the fuel sources that embers ignite first when they land during a wildfire.

If your property is in a Very High Fire Hazard Severity Zone (many San Diego neighborhoods are), this applies to you. And even if you're in a lower-risk zone, your insurance carrier may already be asking about it.

Why Zone Zero matters more than you think

Most homes lost during wildfires aren't destroyed by a wall of flame. Research consistently shows that embers, not direct flame contact, are responsible for the majority of home ignitions. Embers travel ahead of the fire front (sometimes a mile or more on strong winds), land on surfaces around homes, and ignite whatever combustible material they find.

Zone Zero targets the materials closest to the structure because that's where ignition matters most. An ember that lands on gravel five feet from your wall burns out. The same ember landing on dry wood mulch against your foundation can ignite the mulch, which heats the siding, which ignites the wall assembly. The five-foot buffer is the difference between a near-miss and a house fire.

This isn't theoretical. Studies from major California wildfires have shown that homes with noncombustible materials in the immediate perimeter survived at significantly higher rates than homes with combustible materials touching the structure, even when the surrounding vegetation and fire conditions were similar.

What Zone Zero requires

The Zone 0 framework establishes specific requirements for the first five feet around covered structures. While the exact language of the final statewide regulation is still completing the administrative process, the City of San Diego's adopted guidelines provide a clear picture of what compliance looks like:

Ground cover within 5 feet of the structure: Noncombustible materials only. Gravel, decomposed granite, pavers, concrete, stone, and bare mineral soil are acceptable. Wood mulch, bark chips, rubber mulch, and dry organic material are not. Well-maintained, irrigated, fire-resistant plants may be allowed depending on the jurisdiction's specific requirements, but dead or dry vegetation of any type must be removed.

Items stored within 5 feet: No firewood, lumber, cardboard, or other combustible storage against exterior walls. No propane tanks, gasoline containers, or flammable liquids within the zone. Trash and recycling bins (which are combustible) should be stored away from the structure when not at the curb.

Fencing attached to the structure: Combustible fencing (wood) that connects to the building creates a direct fuel path from the fence to the structure. Under Zone 0 requirements, the first five feet of fencing from the structure should be noncombustible material (metal, masonry) or there should be a noncombustible barrier between the fence and the building.

Decks and stairs within the zone: Combustible decking material, deck underside debris, and combustible items stored under decks within five feet of the structure are all conditions that need to be addressed. The underside of decks is a particularly high-risk area because debris collects there and embers can access the space through gaps in the decking.

Exterior walls and siding: While Zone 0 primarily addresses materials on the ground and items stored against the structure, the condition of the exterior wall itself matters. Gaps in siding, deteriorated stucco, exposed wood framing, and damaged exterior materials within the zone create pathways for ember intrusion. An inspection evaluates whether the building envelope within Zone 0 is intact and continuous.

What a Zone Zero inspection looks like

A Zone Zero evaluation assesses the conditions within the first five feet around the entire perimeter of the structure. It's a systematic walk-around that checks every surface, every stored item, every ground cover, and every attachment point where combustible materials could provide fuel for an ember that lands near the home.

Here's what the inspector evaluates:

Zone Zero item	What the inspector checks	Why it matters
Ground cover	Mulch type, vegetation condition, clearance from foundation	Combustible ground cover is the #1 ember target
Stored items	Firewood, lumber, boxes, propane, trash bins	Combustible storage against walls ignites easily
Fencing	Material, attachment to structure, first 5 feet	Wood fencing creates a direct fuel path to the building
Decks and stairs	Material, underside condition, debris accumulation	Under-deck debris is a concealed ignition zone
Exterior walls	Siding condition, gaps, deterioration, exposed framing	Compromised envelope allows ember intrusion
Vents	Screening type, mesh size, condition	Standard vents allow embers into attic/crawl space
Gutters	Debris accumulation, dry leaf buildup	Gutter debris ignites easily from a single ember
Eaves and soffits	Open vs. enclosed, material type	Open eaves are one of the most vulnerable ignition points
Roof edge	Debris at roof-wall junction, flashing condition	Where the roof meets the wall collects windblown debris
Penetrations	Utility entries, pipe openings, gaps	Any gap is an ember entry point

This isn't a pass/fail inspection. It's an evaluation that identifies conditions within the zone and provides information about what needs to change for compliance and, more importantly, for fire safety.

The vents nobody thinks about

Attic vents, crawl-space vents, soffit vents, and ridge vents exist to allow airflow through the building. During a wildfire, they also allow embers in.

Standard vent screening (quarter-inch mesh or larger) doesn't stop embers. The current recommendation for wildfire-resistant vents is 1/8-inch mesh or finer, and purpose-built ember-resistant vents are available that are designed to allow airflow while blocking ember intrusion.

During a Zone Zero evaluation, the inspector checks every exterior vent for mesh size, condition, and vulnerability. This includes attic vents on gable ends, soffit vents under the roof overhang, ridge vents along the roof peak, crawl-space vents at the foundation, and dryer vents, kitchen exhaust vents, and bathroom vents on exterior walls.

Replacing vent screening with ember-resistant mesh or installing purpose-built ember-resistant vents is one of the most cost-effective home hardening improvements available. The vents themselves are relatively inexpensive, and the reduction in ember vulnerability is significant.

Gutters: the debris trap on your roof

Gutters accumulate dry leaves, pine needles, dust, and other organic debris over time. During a wildfire, a single ember landing in a debris-filled gutter can ignite the accumulated material, which burns along the gutter line and can ignite the fascia, the eave, and eventually the roof.

Keeping gutters clean is a maintenance task that has always been important for drainage. Under Zone Zero thinking, it becomes a fire safety issue as well. Metal gutters with gutter guards that prevent debris accumulation provide the best combination of drainage function and fire resistance.

Eaves and soffits: the vulnerable underside

Open eaves (where the rafter tails are exposed below the roof overhang) are one of the most vulnerable points on a home during a wildfire. Embers collect in the protected space under the overhang, and the exposed wood framing provides fuel. Heat rising along the exterior wall concentrates under the eave, raising the temperature of the materials there.

Enclosed soffits (boxing in the rafter tails with noncombustible or fire-resistant material) significantly reduce this vulnerability. The inspector evaluates whether eaves are open or enclosed, what material the soffits are made of, and whether there are gaps or deterioration that could allow ember intrusion.

How Zone Zero connects to your insurance

Here's the practical reality that's motivating many San Diego homeowners to comply even before enforcement begins: insurance.

Carriers in fire-prone areas of California have been tightening underwriting standards, non-renewing policies, and increasing premiums for properties that don't meet defensible space requirements. Some carriers are already asking specifically about Zone 0 compliance, even before the statewide regulation is finalized. A property that can demonstrate compliance with Zone 0 requirements may have more insurance options and potentially better terms than one that can't.

The San Diego Fire-Rescue Department has taken an education-first approach for 2026, with enforcement ramping up in 2027 and full compliance expected by 2029. But insurance carriers operate on their own timeline, and some are ahead of the regulatory enforcement curve.

The timeline for San Diego homeowners

Here's where things currently stand as of September 2026:

Statewide: The Board of Forestry approved the final Zone 0 draft on August 19, 2026. It must complete OAL review and be filed with the Secretary of State before taking effect. No statewide effective date has been set yet.

City of San Diego: Zone 0 is already adopted under SDMC Section 512.0604. New structures in Very High Fire Hazard Severity Zones have been required to comply since February 28, 2026. Existing structures have a compliance target of February 28, 2027. The city is focusing on education and outreach during 2026, with enforcement expected to increase in 2027.

Unincorporated San Diego County: County fire code requirements apply. Check with the San Diego County Fire Authority or your local fire district for specific Zone 0 requirements and timelines.

Practical reality: Regardless of the regulatory timeline, the fire risk is the fire risk. Zone 0 compliance reduces your home's vulnerability to embers whether or not enforcement has begun. And the approaching El Niño winter (which may delay some outdoor work) makes fall 2026 the optimal time to evaluate and address Zone 0 conditions.

What you can do this week

Most Zone Zero compliance work is accessible to homeowners and doesn't require contractors:

Replace wood mulch within five feet of the structure with gravel, decomposed granite, or stone. Move firewood, lumber, and combustible storage at least 30 feet from the building. Clear dead vegetation, dry leaves, and debris from within the zone.

Clean gutters and remove accumulated debris. Move trash and recycling bins away from the structure (store them in a noncombustible area between collection days). Check under decks and stairs for accumulated debris and remove it. Trim or remove any dead plants within five feet of the building.

For improvements that may require professional help (replacing combustible fencing, enclosing open eaves, installing ember-resistant vents, replacing combustible decking), an inspection identifies the specific conditions and helps you prioritize the work based on what creates the most vulnerability.

How we evaluate Zone Zero readiness at 360 Home Inspections

We evaluate Zone Zero conditions as part of our standard home inspection when the property is in a fire-prone area, or as a focused assessment for homeowners who want to understand their compliance status and fire readiness. Our inspectors walk the full perimeter, evaluate every item within the five-foot zone, check vent screening, assess gutter condition, evaluate eave and soffit construction, and document conditions with photos.

We provide a clear picture of what meets current requirements and what needs to change, with practical information about what you can handle yourself and what may need professional attention.

We also evaluate the broader defensible space zones (Zone 1 at 5 to 30 feet, Zone 2 at 30 to 100 feet) and the building's overall fire resilience, including roof material, window type, and exterior construction. For a complete overview of our inspection services, visit our residential services page.

We serve communities throughout San Diego County. Schedule your inspection or call us at (858) 707-7066.

Frequently asked questions

Q: What is Zone Zero?

Zone Zero (Zone 0) is the first five feet around a home or structure. Under California's new defensible space framework, this area must be maintained as an ember-resistant zone free of combustible materials. The purpose is to eliminate the fuel sources that embers ignite when they land near a building during a wildfire.

Q: Is Zone Zero required in San Diego?

The City of San Diego has adopted Zone 0 under SDMC Section 512.0604. New structures in Very High Fire Hazard Severity Zones have been required to comply since February 28, 2026. Existing structures have a compliance target of February 28, 2027. The statewide regulation has been approved by the Board of Forestry but is not yet finalized as law.

Q: What needs to be removed from Zone Zero?

Wood mulch, bark chips, dead vegetation, firewood, lumber, combustible storage, combustible fencing attached to the structure, and any other flammable materials within five feet of the building should be removed or replaced with noncombustible alternatives.

Q: Does Zone Zero affect my home insurance?

Some insurance carriers are already factoring Zone 0 compliance into their underwriting decisions, even before enforcement has fully ramped up. Properties that can demonstrate compliance may have more favorable insurance options than those that can't. Check with your carrier for specifics.

Q: How much does Zone Zero compliance cost?

Costs vary by property. Simple items (replacing mulch with gravel, moving stored materials, clearing debris) are low-cost or DIY. More significant improvements (replacing combustible fencing, enclosing open eaves, installing ember-resistant vents) involve material and labor costs that depend on the scope. An inspection helps you prioritize the highest-impact improvements.

Q: Do I need an inspection for Zone Zero compliance?

An inspection is not required for compliance, but it identifies conditions you may not recognize as combustible risks and provides a documented assessment of your property's current status. For buyers, the evaluation is part of understanding the property's fire readiness.

Q: What's the difference between Zone 0, Zone 1, and Zone 2?

Zone 0 covers 0 to 5 feet from the structure (ember-resistant zone). Zone 1 covers 5 to 30 feet (lean, clean, green vegetation management). Zone 2 covers 30 to 100 feet (fuel reduction through plant spacing and dead material removal). All three zones work together to create a defensible buffer around the home.

Q: Can I have plants in Zone Zero?

Depending on the jurisdiction's specific requirements, well-maintained, irrigated, fire-resistant plants may be allowed in Zone 0. Dead or dry vegetation is not allowed. Check the City of San Diego's guidelines for details on approved materials and plant conditions.

Q: What about fences attached to the house?

Combustible fencing (wood) that connects to the structure creates a direct fuel path. Under Zone 0 requirements, the first five feet of fencing from the structure should use noncombustible material (metal, masonry) or a noncombustible connection between the fence and the building.

Q: Is Zone Zero only for homes in fire zones?

The regulatory requirements apply to properties in State Responsibility Areas and Very High Fire Hazard Severity Zones (and, depending on timing, High Fire Hazard Severity Zones). However, the fire safety principles of Zone 0 benefit any property. Embers can travel well beyond designated fire zones during major wildfire events.

Final thoughts

Zone Zero isn't red tape. It's the recognition that the five feet closest to your home are the five feet that matter most when embers start landing. The regulation is catching up to what fire science has known for years: homes with noncombustible perimeters survive wildfires at significantly higher rates.

San Diego is one of the most fire-prone counties in California. The regulations are rolling in. The insurance carriers are already adjusting. And the fire season doesn't wait for anyone to finish their compliance checklist. The time to evaluate your Zone Zero is now, while you have a weekend to do the simple work and time to schedule the larger improvements before the Santa Ana winds return.

This article reflects regulatory and compliance information available as of

2026. Zone Zero regulations are evolving at both the state and local level. Verify current requirements with the City of San Diego Fire-Rescue Department, the San Diego County Fire Authority, or CAL FIRE for your specific property and jurisdiction.