September 9, 2026
On August 19, 2026, the California Board of Forestry and Fire Protection approved the state's first Zone 0 regulation — an ember-resistant zone covering the first five feet around a building. For a Los Angeles project inside a Very High Fire Hazard Severity Zone, it is the most consequential change to site and landscape design since the Wildland-Urban Interface Code, and it arrives with a split timeline: existing homes get three to five years to comply, new construction gets none. This report covers what the approved rule requires inside those five feet, how the "new construction" test is defined, and where the requirements land in a Los Angeles plan check. One caveat throughout: the rule is not yet enforceable. It takes effect only after review by the Office of Administrative Law, and the text described here is the version the Board approved pending that review.
What Zone 0 Is, and Where It Applies
Zone 0 is the area within five feet of a structure — but the measurement does not start at the wall. It begins at the exterior surface of the exterior wall, the roof, or an attached deck, stairs, or pergola, and runs five feet out or to the property line, whichever comes first. A deck that is structurally self-supporting but sits within one foot of the house counts as part of the structure, so its outside edge starts the measurement, not the wall behind it. Patios built of noncombustible material are excluded from the definition.
The rule applies in two places: State Responsibility Areas under Public Resources Code section 4291, and Very High Fire Hazard Severity Zones within Local Responsibility Areas under Government Code section 51182. The City of Los Angeles is a Local Responsibility Area, so the only question that matters for an LA parcel is whether it is mapped Very High — which covers most of the hillside neighborhoods above the Basin, including Pacific Palisades, Brentwood, Bel Air, and the Hollywood Hills.
That mapping is itself in motion. CAL FIRE's Office of the State Fire Marshal issued updated Local Responsibility Area hazard maps for Southern California on March 24, 2025, and the Los Angeles Fire Department has said it expects an increase in the number of affected parcels. State law bars a local agency from lowering the hazard level the state recommends, though it may raise it, and the City is required to adopt the recommended maps by ordinance. Confirm a specific address against the LAFD fire zone map before assuming a property is outside the rule.
The regulation traces back through AB 3074 (2020) and SB 504 (2024), which amended Public Resources Code 4291 to require an ember-resistant zone, and was accelerated after the January 2025 Los Angeles fires by Executive Order N-18-25, which directed the Board of Forestry to complete the rulemaking.
The Date That Decides Whether You Are New Construction
The rule draws a hard line, and it uses the same mechanism as the energy code: the building permit application date. A "New Occupied Structure" is one for which the permit application for initial construction was submitted after the effective date of the regulation. An "Existing Occupied Structure" is one that was already built, already under construction, or whose permit application was submitted before that date.
The consequence is not subtle. New construction must comply with every Zone 0 requirement from the effective date — there is no phase-in, no three-year window, no local extension. Existing structures get a staged schedule: roof and gutter clearance and the tree-branch separations required by existing statute apply immediately; removal of combustible materials, firewood, mulch, and ladder fuels comes within three years; and the vegetation-free buffer, fence and gate replacement, and outbuilding changes come within three years, or up to five, on a timeline set by the local fire agency.
For anyone weighing a Los Angeles project right now, that means the permit application date determines whether Zone 0 is a design constraint you build to or a maintenance program you grow into. It is the same trap we described in the 2026 Los Angeles Energy Code Report, and it rewards the same discipline: settle the compliance path before the drawings are priced.
Two Bands Inside the First Five Feet
The approved rule does not treat the five feet as one uniform strip. It splits it into a stricter inner band and a more permissive outer one.
The inner band is a vegetation-free safety zone. It runs a minimum of one foot from the wall, or out to the edge of the eave — whichever is farther, up to five feet. A twelve-inch eave produces a twelve-inch safety zone; a thirty-six-inch eave produces a thirty-six-inch one. On top of that, no vegetation is permitted within two feet of windows, doors, posts, or vents, or within five feet of an attached deck, stairs, or pergola.
That last set of numbers is where the rule stops being a landscaping matter and becomes an architectural one. Deep overhangs are a signature of the Los Angeles modernist vocabulary, and under Zone 0 a generous eave buys a proportionally wider band of required hardscape. A three-foot overhang means three feet of noncombustible ground before anything can be planted — a decision that has to be made alongside the roof design, not handed to a landscape architect afterward.
The outer band, running from the safety zone out to the full five feet, is a low-combustibility zone. No combustible materials are permitted anywhere in it: fallen leaves and needles, bark and woodchip mulch, stored firewood, and other combustible debris are all excluded, and roofs and rain gutters must be kept clear. The areas underneath decks, balconies, pergolas, and stairs must be free of both vegetation and combustible items. Inspectors may allow a temporary exception for mulch used to control erosion during active construction.
What Can Still Be Planted
Outside the vegetation-free buffers but still inside the five feet, the rule allows a narrow palette — all of it non-woody:
- Well-maintained non-woody plants under three inches tall, including lawns and ground covers, kept mowed to that three-inch limit.
- Well-maintained non-woody plants between three and eighteen inches, in plantings no larger than one square foot, spaced apart by one and a half times the height of the tallest plant.
- Potted non-woody plants in unaffixed noncombustible containers of no more than five-gallon capacity, no taller than eighteen inches, with the same one-and-a-half-times spacing.
Woody shrubs are out of Zone 0 entirely. So is combustible mulch, which pushes the ground plane toward gravel, decomposed granite, stone, and pavers — materials that need to be drawn and detailed rather than specified late as a finish.
Trees
Existing trees may remain in Zone 0, subject to maintenance: no dead or dying branches; live branches at least ten feet from chimneys and stovepipe outlets; no live branches underneath eaves; ladder fuels removed from the first six feet of trunk or the lower third of the tree, whichever is smaller; and live branches at least five feet above a roof and one foot from walls where there is no eave.
The provision that matters most on a new build is different in kind: no new trees may be planted in Zone 0 once the regulation takes effect, aligning the rule with the Wildland-Urban Interface Code. That is a planting-plan constraint, not a maintenance item, and it removes the specimen tree tucked against a facade as an option.
Fences, Gates, Decks, and Outbuildings
Combustible fences and gates may not be attached to a structure at all. Any fence or gate that is attached, or that comes within one foot of contact, requires a five-foot noncombustible span measured from the point of attachment or the closest point. After the effective date, no new combustible fences or gates are permitted within five feet of a structure, whether attached or running parallel to it — though repairs to an existing combustible fence may still use combustible replacement materials.
Outbuildings — under 120 square feet and not used for habitation — are not permitted in Zone 0 unless they are built entirely of noncombustible exterior walls and roof. "Noncombustible" is defined by reference to the ASTM E136 test, matching the standard in section 501.4.1 of the California Wildland-Urban Interface Code.
In practice this is one of the more disruptive provisions for Los Angeles hillside properties, where a wood side gate and a wood fence returning into the house are close to universal. The fix is a metal gate and five feet of noncombustible fence at every attachment point — modest in cost when it is designed in, considerably less so when it is discovered at final inspection.
Where This Lands in a Los Angeles Plan Check
Los Angeles is not starting from zero here. The Department of Building and Safety already runs a Fire Hazard Severity Zone Supplemental Checklist against the 2025 California Wildland-Urban Interface Code, effective January 1, 2026, for buildings in High and Very High zones. That checklist already requires a landscape plan showing thirty-foot fuel management zones, identification of existing and proposed vegetation and irrigated areas, a plant legend, and ground covering within the thirty-foot zone. It already caps shrubs at six feet tall and ten feet in diameter, with fifteen feet of separation between them and thirty feet from structures, and it already requires planted trees to hold ten feet of separation from structures at maturity.
The significance for builders is that the landscape plan is already a reviewed permit document in Los Angeles fire zones. Zone 0 adds a stricter inner ring to a sheet the city is already checking. Hardscape extents, drainage at the building perimeter, gate hardware, and the planting schedule move from post-permit refinements into the permit set itself.
What Local Agencies Can Change
The rule leaves real discretion to local fire agencies in Local Responsibility Areas. They may adopt alternative practices that account for local variation — lot size, topography, structure density, the composition of the building exterior, available emergency response, or compliance with Wildland-Urban Interface building standards. Those alternatives must be approved by the governing body, such as a city council or board of supervisors, and supported by a finding that they deliver at minimum substantially similar practical effects, and no less protection than state law requires.
For Los Angeles projects, that means the operative document may eventually be a city ordinance rather than the state text, and the two should be confirmed against each other before a landscape plan is finalized. One useful protection is written into the rule already: a neighbor adding a structure, including an accessory dwelling unit, cannot force you to create additional defensible space on your own property or put you out of compliance.
The Bottom Line
Zone 0 does not restrict what a luxury home in Los Angeles can be. It restricts what can occupy the five feet immediately around it, and it moves several decisions that have traditionally been made late — ground plane materials, gate construction, planting adjacent to the facade — into the architectural set. The eave dimension now carries a landscape consequence. The fence detail now carries a materials requirement. The planting plan now has a hard inner boundary.
The projects that absorb this well will be the ones that treat the first five feet as part of the building rather than part of the garden, and that resolve it at design development. The projects that struggle will be the ones that submit a permit application after the effective date carrying a planting plan drawn under the old assumptions — because for new construction, there is no phase-in to fall back on.
How Blackbriar Builds to Zone 0
Blackbriar Development treats wildfire compliance as a design input rather than an inspection hurdle. Our pre-construction process confirms a property's hazard zone designation before schematic design, sets the safety zone width against the actual eave dimension, and resolves the ground plane, gate details, and planting palette while they are still drawing decisions rather than change orders. Our full-service approach carries that through procurement and installation, coordinating the landscape and architectural sets so the plan check sees one consistent story.
If you are planning a Los Angeles build or rebuild on a property in a Very High Fire Hazard Severity Zone, see our recent work or start a conversation about your site, your program, and how the fire code shapes both.
FAQ
Is Zone 0 in effect right now?
Not yet. The Board of Forestry and Fire Protection approved the final draft on August 19, 2026, but the regulation becomes enforceable only after review by the Office of Administrative Law. The requirements below apply from that effective date, not from the date of the Board's vote.
Does Zone 0 apply to my Los Angeles property?
It applies if the parcel sits in a State Responsibility Area or in a Very High Fire Hazard Severity Zone within a Local Responsibility Area. Los Angeles is a Local Responsibility Area, so the test is the hazard mapping on your specific parcel. CAL FIRE issued updated Southern California maps in March 2025 and the City is required to adopt them by ordinance, so verify the current designation by address rather than relying on an older map.
Why does new construction get no phase-in?
Because the rule defines a "New Occupied Structure" by permit application date. If the application for initial construction is submitted after the effective date, the project must meet every Zone 0 requirement from day one. Existing structures — including those already permitted — phase in over three to five years instead.
Can I still have plants and trees within five feet of the house?
Some. Non-woody plants are allowed outside the vegetation-free buffers: ground covers and lawn under three inches, plants up to eighteen inches in small spaced groupings, and potted plants in noncombustible containers up to five gallons. Woody shrubs and combustible mulch are not permitted. Existing trees may remain if maintained to the branch clearances, but no new trees may be planted in Zone 0 once the rule takes effect.
How wide is the vegetation-free area against the wall?
At least one foot, or out to the edge of the eave, whichever is farther, up to five feet — so the eave dimension sets it. Separately, no vegetation is allowed within two feet of windows, doors, posts, or vents, or within five feet of an attached deck, stairs, or pergola.