California's New Zone 0 Rules: What They Mean for Your Custom Home in Rancho Santa Fe and Poway

California's Zone 0 rules put the first 5 feet around your home at the center of wildfire safety. Here's what they require, where they already apply in San Diego County, and how to design for them without giving up the indoor-outdoor living you love.

Mid-October's Santa Ana winds were a sharp reminder of how fast a wildfire can reach a neighborhood. The Henderson Fire burned more than 2,000 acres near Camp Pendleton, and on October 16 the Norte Fire raced from San Clemente into San Juan Capistrano, damaging or destroying six homes. For families in Rancho Santa Fe, Poway, Rancho Bernardo, Escondido and across inland North County, those fires hit close to home.

They also put a spotlight on Zone 0, California's new ember-resistant zone. Whether you're planning a custom home, an addition or a remodel, here's what you need to know.

Zone 0 at a glance

• Zone 0 is the first 5 feet around your home, the area where wind-blown embers are most likely to start a house fire.
• Statewide Zone 0 rules are approved but not yet in force. The state pulled them back for technical edits in September, and no effective date has been set.
• The City of San Diego isn't waiting. New homes in its Very High Fire Hazard Severity Zones must already comply, and existing homeowners have until February 2027.
• New construction is the easiest place to get it right. Designing the 5-foot perimeter from the start is far simpler than retrofitting it later.

What is Zone 0?

Zone 0 is the first 5 feet around a home. It's measured from the exterior walls, the roof edge and anything attached to the house, such as a deck, stairs or a pergola, out to 5 feet or the property line, whichever comes first. It's the newest layer of California's defensible space rules, joining Zone 1 (5 to 30 feet) and Zone 2 (30 to 100 feet).

Why focus so tightly on the house? Because that's where homes actually catch fire. In wind-driven wildfires, embers fly well ahead of the flames and collect against walls, in corners and under decks. When they land in bark mulch, dry leaves or a stack of firewood, a home can ignite even if the fire itself never arrives.

The state's rules divide Zone 0 into two parts:

• The safety zone is a vegetation-free strip directly against the house. It extends at least 1 foot from the wall, or to the edge of the eaves if they reach farther. It widens to 2 feet around windows, doors and vents, and to 5 feet around attached decks, stairs and pergolas.
• The low-combustibility zone covers the rest of the 5 feet. Limited, well-maintained, non-woody plants are allowed here; combustible materials are not.

Zone 0 is the innermost of three defensible space zones. Zones 1 and 2 extend the cleared, well-maintained area out to 100 feet.

What's allowed, and what isn't, within 5 feet of your home

Zone 0 doesn't mean a bare dirt moat around your house. The rules target the materials embers ignite most easily, while leaving room for low, well-kept planting.

Not allowed in Zone 0

• Bark, wood chips and other combustible mulch
• Firewood
• Dead or dying plants, fallen leaves and pine needles
• Combustible items stored under decks, balconies, stairs or pergolas
• New combustible fences or gates
• Sheds and small outbuildings, unless they're built entirely of noncombustible materials

Roofs and gutters must also be kept clear of leaves and debris.

Still allowed, outside the safety zone

• Lawns and ground covers under 3 inches tall
• Non-woody plants 3 to 18 inches tall, in small, well-spaced patches
• Potted plants up to 18 inches tall, in movable, noncombustible containers
• Trees, if they're properly maintained: branches at least 10 feet from chimneys and 5 feet above the roof, nothing growing under the eaves, and lower limbs removed so flames can't climb

Where a fence or gate meets the house, the first 5 feet must be noncombustible. Existing wood fences can still be repaired.

In practice, Zone 0 changes how the edge of a home is designed. Gravel, pavers, decomposed granite, concrete and natural stone replace mulch and shrubs along the foundation, and fuller plantings move out to Zone 1.

Is Zone 0 law yet?

Not statewide, at least not yet. The California Board of Forestry and Fire Protection unanimously adopted Zone 0 rules on August 19, 2026, and sent them to the Office of Administrative Law for final legal review on August 28. On September 8, the Board withdrew the package to make technical edits, a step it has described as procedural rather than a rejection. Board staff say they are still working with that office on a final review, and no statewide effective date has been set.

When the rules do take effect, new homes in covered areas must comply immediately. Existing homes will get a phased timeline, outlined below.

Where Zone 0 already applies in San Diego County

The state rules cover two kinds of property: anything in a State Responsibility Area, where CAL FIRE is the primary wildland firefighting agency, and anything in a Very High Fire Hazard Severity Zone within a city or other local jurisdiction. In San Diego County, your address makes a real difference.

• City of San Diego (including Rancho Bernardo, Carmel Valley, Del Mar Heights and Black Mountain Ranch): Zone 0 has applied to new structures in Very High zones since February 12, 2026, and permit applicants must show compliance during plan review. About two-thirds of the city's land, roughly 142,571 acres, lies in a Very High zone. Existing homeowners have been asked to meet the city's guidelines by February 2027.
• Unincorporated communities (such as Rancho Santa Fe, Fairbanks Ranch and 4S Ranch): many properties may be in a State Responsibility Area, where the state rules will apply once they're final.
• Other cities (such as Poway, Escondido, Del Mar, San Marcos and Vista): the state rules will apply to homes inside each city's designated Very High zone.

Local fire agencies can also adopt stricter standards or approved alternatives, so check with your fire district before you design.

How to check your property

1. Enter your address on CAL FIRE's Fire Hazard Severity Zone map.
2. In the City of San Diego, also check the city's Very High Fire Hazard Severity Zone map and its defensible space page, where you can request a free home wildfire risk assessment.
3. If your property is in a State Responsibility Area or a Very High zone, plan your project with Zone 0 in mind.

Zone 0 timeline for new and existing homes

Once the statewide rules take effect, the schedule in the August version looks like this:

In the City of San Diego, the clock is already running. New homes in Very High zones must comply today, and existing homeowners have until February 2027. The city has said it will emphasize education and practical, property-specific plans over penalties.

Designing a custom home around Zone 0

The best time to plan for Zone 0 is at the drawing board, not after the landscaper arrives. New homes must comply from day one, and in the City of San Diego compliance is already reviewed at the permit stage. In a design-build process, architecture, landscape and construction are planned together, so the 5-foot perimeter looks intentional rather than retrofitted.

These are the details that matter most on a custom home in a fire hazard zone:

• Eave depth. Deep overhangs define Spanish, Mediterranean and California ranch architecture. Because the safety zone extends to the edge of the eaves, a 3-foot overhang means a 3-foot planting-free strip, which is best designed as hardscape from the start.
• The foundation edge. Pavers, stone, concrete or decomposed granite against the house create a clean, finished line. Planting beds shift outward, where they can be fuller and more lush.
• Decks, stairs and pergolas. Plants must stay 5 feet away, and nothing combustible can be stored underneath. Patios at grade, noncombustible decking and enclosed undersides solve this without giving up outdoor living space.
• Side-yard fences and gates. Where a fence meets the house, the first 5 feet should be metal or masonry. It's a small detail that's easy to get right on paper and costly to change later.
• Windows, doors and vents. Each needs a 2-foot clear zone outside. On the house itself, California's Wildland-Urban Interface Code, which consolidated the former Chapter 7A building standards on January 1, 2026, already requires Class A roofing, listed ember-resistant vents and fire-resistant glazing for new homes in hazard areas.
• Trees and outbuildings. New trees go where their mature canopy will stay clear of the roof. Pool houses, sheds and trash enclosures sit outside Zone 0 or are built from noncombustible materials.

The result is a home that meets the rules and still feels like San Diego: open to the outdoors, beautifully landscaped and welcoming.

Upgrading an existing home for Zone 0

Existing homes have more time, but there's no reason to wait. Several steps cost little and can be done this weekend:

• Clean the roof and gutters
• Move firewood, trash bins and stored items away from exterior walls
• Replace bark mulch along the foundation with gravel or stone
• Clear anything stored under decks and stairs

Larger upgrades fit naturally into a remodel or addition:

• Replace wood fence and gate sections that touch the house
• Rebuild an aging deck with noncombustible materials, or enclose its underside
• Convert foundation plantings to hardscape as part of a landscape refresh
• Upgrade to ember-resistant vents, enclosed eaves and multi-pane windows
• Relocate or rebuild any shed within 5 feet of the house

Planning an addition? Ask your designer early how your local fire agency will apply Zone 0 and the Wildland-Urban Interface Code to the new work.

Zone 0 and your home insurance

Fire hardening can also pay off at renewal. Under California's Safer from Wildfires regulation, insurers must offer discounts for specific mitigation steps. Qualifying actions include a 5-foot ember-resistant zone (fencing included), a Class A roof, ember- and fire-resistant vents, enclosed eaves, multi-pane windows and noncombustible material along the bottom 6 inches of exterior walls.

Discounts vary by carrier, so ask yours which credits apply, and keep photos and receipts of the work.

Frequently asked questions

What is Zone 0 in California?

Zone 0 is California's ember-resistant zone: the first 5 feet around a home and any attached deck, stairs or pergola. Rules for this zone limit combustible materials such as bark mulch, firewood, dead plants and wood fencing, because embers that land there are one of the most common ways homes catch fire during wildfires.

Is Zone 0 law in California yet?

Not statewide. The Board of Forestry approved Zone 0 rules in August 2026, then withdrew them from final legal review in September to make technical edits. No statewide effective date has been set. The City of San Diego, however, already applies Zone 0 to new homes in Very High Fire Hazard Severity Zones.

Do I have to remove all plants within 5 feet of my house?

No. The state rules allow lawns and ground covers under 3 inches, small non-woody plants up to 18 inches, potted plants in noncombustible containers and well-maintained trees. Plants are not allowed directly against the wall, under the eaves, or close to windows, doors, vents and attached decks.

Does Zone 0 apply to new construction?

Yes. New homes in covered areas must meet Zone 0 as soon as the rules take effect, while existing homes get a phased timeline of roughly three to five years. In the City of San Diego, new homes in Very High zones already must show compliance during permit review.

How do I know if my home is in a Very High Fire Hazard Severity Zone?

Enter your address on CAL FIRE's Fire Hazard Severity Zone map. Zone 0 applies in State Responsibility Areas and in Very High zones within cities and other local jurisdictions. City of San Diego residents can also check the city's own map and request a free home wildfire risk assessment.

Can Zone 0 improvements lower my home insurance?

They can. California's Safer from Wildfires regulation requires insurers to offer discounts for qualifying steps, including a 5-foot ember-resistant zone, a Class A roof, ember-resistant vents and upgraded windows. Discounts vary by insurer, so ask your carrier and keep records of the work.

Build with Zone 0 in mind from day one

Zone 0 is easiest to get right before construction begins. MDD Homes is a San Diego design-build firm led by founder Monty McCullough, who brings more than 30 years of experience to custom homes, additions and remodels across Rancho Santa Fe, Del Mar, Poway, Escondido and North County. With design, value engineering, scheduling and construction under one roof, wildfire requirements become part of the plan from the very first sketch.

Ready to start? Schedule a design consultation or call 858-756-0700 to talk through your property and your project.

This article is for general information and isn't legal advice. Zone 0 requirements are still being finalized and vary by jurisdiction, so confirm current rules with your local fire agency.