Why five feet matters more than the other ninety-five
Most homes lost in California wildfires are never touched by a wall of flame. They ignite from embers — burning fragments carried a mile or more ahead of the fire on the wind — that land in something flammable right against the house: a juniper under the window, a bed of bark mulch, a stack of firewood, a pile of dry leaves in the corner where the fence meets the wall. Once that small fire is burning against the siding or under the eave, the house goes.
Zone 0 exists to take those ignition points away. It is the innermost of California's three defensible space zones, created by Assembly Bill 3074 in 2020, and it is the part of your property where a few hours of work does the most to change the outcome.
What the City of San Diego requires you to remove
Within five feet of your home you must remove dead plants, dry or fallen leaves, pine needles, mulch, firewood, trash, debris and other flammable materials — and the same applies to roofs, gutters, decks, porches, balconies, stairways and the space beneath the home.
That is the city's own list. In practice, here is what it means for a typical San Diego yard, walking the perimeter of the house:
- Woody shrubs and hedges against the walls. Junipers, Italian cypress, bougainvillea, oleander, rosemary, and most foundation plantings within five feet of the house. These are the most common ember catchers in San Diego and the most common thing crews remove.
- Bark, wood chip, and rubber mulch. Replace with gravel, decomposed granite, pavers, concrete, or bare soil. Rubber mulch burns hotter than wood and does not qualify.
- Dead and dry material. Leaf litter, pine needles, palm fronds, dead branches, dry grass — on the ground, in gutters, on the roof, and under decks.
- Stored combustibles. Firewood, lumber, propane cylinders, trash and recycling bins, cardboard, patio cushions, brooms, natural-fiber doormats, and anything else that can hold an ember.
- The fence section that touches the house. A wooden fence attached to the wall is a fuse. The last few feet typically need to become a noncombustible gate or panel (metal, masonry, or fiber cement). Wooden fences that are not properly maintained may need to come out entirely.
- Vegetation overhanging the roof. Tree branches must be kept at least five feet from roofs and exterior walls, and the canopy at least ten feet from roofs and other structures.
What can stay
- Hardscape. Concrete, gravel, pavers, decomposed granite, and bare soil are all acceptable ground cover in Zone 0.
- Healthy, maintained trees. Established trees can remain if they are healthy, regularly pruned, limbed up, and the vegetation and litter beneath them is cleared, with branches kept five feet from the house and the canopy ten feet from the roof.
- Wooden decks and porches. Existing decks and porches are treated as extensions of the structure. They can stay, but the area under and around them must be kept clear.
- Well-irrigated, low, non-woody plants. Some jurisdictions allow succulents and similar low-fuel plants in Zone 0 if they are green and maintained. Treat this as the exception, not the rule, and confirm with your fire authority before relying on it.
The full room-by-room breakdown is in What can stay and what must go.
Who has to comply, and by when
In the City of San Diego, Zone 0 has been required for all new structures in Very High Fire Hazard Severity Zones since February 28, 2026, and existing homes in those zones must comply by February 28, 2027.
The city's 2025 Fire Hazard Severity Zone map, released by the Office of the State Fire Marshal, places roughly two-thirds of the city in a Very High zone. If your home backs onto a canyon, open space, or undeveloped hillside, assume it applies. Check your address here.
Outside the city limits — Poway, Escondido, Ramona, Alpine, Rancho Santa Fe, and unincorporated county — the statewide Zone 0 regulation applies on the timeline set by California's Board of Forestry and Fire Protection, and the longstanding 100-foot defensible space law (Public Resources Code 4291) already requires brush management. See the deadline guide for the details by jurisdiction.
How enforcement actually works. San Diego Fire-Rescue has said it is "looking for progress, not perfection." The department's approach starts with education, property assessments, and compliance plans. Citations and fines are reserved for owners who make no effort at all. That said, insurers are increasingly asking for defensible space documentation on their own schedule, and a defensible space inspection is already required when you sell a home in a High or Very High zone.
How much work is it?
For a typical suburban lot with a 2,000-square-foot home, Zone 0 is a band roughly 900 square feet in area running around the house. Most of that is already patio, walkway, or driveway. The work is usually concentrated in two or three planted beds, the fence attachment points, and whatever has accumulated under the deck or against the side yard wall.
A homeowner can do the clearing and hauling in a weekend. Replacing mulch beds with gravel or decomposed granite and swapping a fence section for a metal gate is a one- to two-day job for a crew. Larger lots, slopes, and properties that also need Zone 1 and Zone 2 work take longer. See what it costs.
Do it in this order
- Confirm your zone. Look up your address on the 2025 map.
- Walk the five-foot line. Use the printable checklist. Photograph everything before you start — you will want the before-and-after for your insurer.
- Clear the easy stuff yourself. Stored items, bins, cushions, firewood, leaf litter, gutters.
- Get a quote for the rest. Woody plant removal, mulch replacement, fence modification, tree pruning, and anything on a slope. Request a free quote from a licensed local crew.
- Keep it that way. Zone 0 is not a one-time project. Leaves fall, plants grow back, and bins migrate. Put a reminder on the calendar for late spring, before fire season.