CAL FIRE compliant non-combustible fencing for WUI-designated and fire hazard severity zone properties across the San Francisco Peninsula.
The first five feet from your home is the most important area in wildfire defense. A wood fence attached directly to your house in this zone is a fuel path straight to the structure — and California law is closing that gap.
California Assembly Bill 3074 (2020) directed the State Board of Forestry and Fire Protection to establish a third defensible space zone — Zone 0 — covering the first five feet around every structure. CAL FIRE's defensible space research is unambiguous: the majority of homes lost in California wildfires ignite from wind-blown embers that accumulate in the Zone 0 area — under decks, against wood fences, in gutters, and against exterior walls. A wood fence connected to the house in this zone acts as a direct fuel path. The new rules are expected to be finalized by December 31, 2025 under Governor Newsom's Executive Order N-18-25, with enforcement and a three-year compliance window to follow. On the Peninsula, where hillside communities in Pacifica, Brisbane, San Bruno, Millbrae, and unincorporated San Mateo County sit within CAL FIRE-designated Very High Fire Hazard Severity Zones, this is not a distant policy concern — it is a present and local issue.
San Mateo County's WUI Risk Reduction program, administered through the San Mateo County Fire Department, actively enforces defensible space standards and conducts compliance inspections in State Responsibility Areas throughout the Peninsula hillsides. New construction and significant renovations in designated zones must adhere to California Building Code Chapter 7A — Wildland-Urban Interface requirements — which governs fencing and exterior materials at the property line. Properties in Very High Fire Hazard Severity Zones within Local Responsibility Areas face the same requirements. Before any fence project in a hillside Peninsula city, confirming your zone designation with CAL FIRE's Fire Hazard Severity Zone viewer and your local building department is an essential first step — one we handle as part of every estimate on a potentially affected property.
Non-combustible fencing is not a single product — it is a material classification. Steel, aluminum, masonry, concrete block, and specific composite products that have been tested and listed by the California State Fire Marshal all qualify. For properties where a traditional wood fence makes sense for most of the perimeter, a common approach is a non-combustible transition at the house connection — an iron or steel gate and panel in the Zone 0 area, with wood fencing continuing beyond it. This is the practical, cost-effective solution for many Peninsula properties, and it integrates naturally with our ironwork and gates work. For full-perimeter non-combustible installations, powder-coated aluminum and steel panel systems are available in a range of profiles that complement both contemporary and traditional Peninsula architecture — non-combustible does not mean industrial.
The regulations are evolving quickly. Here is a straightforward breakdown of what applies to Peninsula properties, where the rules come from, and what they mean for your fence.
Post-fire analyses of California wildfires consistently show that most homes do not ignite from direct flame contact — they ignite from embers. Wind carries embers miles ahead of an active fire front, and they accumulate in the first five feet around a structure: against walls, under decks, in gutters, and along fence lines attached to the house. CAL FIRE designates this area Zone Zero — the ember-resistant zone — because clearing and hardening it is the single most effective action a homeowner can take to improve their structure's odds of surviving a wildfire.
Assembly Bill 3074, passed unanimously by the California Legislature in 2020, directed the State Board of Forestry and Fire Protection to establish formal Zone Zero regulations. Governor Newsom's Executive Order N-18-25 (February 2025) requires those regulations to be finalized by December 31, 2025, following the Los Angeles area fires. A three-year compliance window is expected to follow, but new construction in State Responsibility Areas and Very High Fire Hazard Severity Zones will be required to comply immediately.
Within the first five feet of any structure, Zone Zero guidelines prohibit combustible mulch and bark, wood fencing attached to the structure, and flammable vegetation. CAL FIRE recommends hardscape — gravel, pavers, or concrete — in this zone instead. The focus is on eliminating the ember accumulation pathway. A wood fence running away from the house beyond five feet may still be acceptable; the critical restriction is the connection point at the structure itself.
For homeowners with wood privacy fencing, the most common solution is a non-combustible transition at the house connection — typically a steel or iron gate and a short non-combustible panel where the fence meets the structure. The rest of the fence run can remain wood. This targeted approach addresses the ember pathway without requiring a full fence replacement, and it is the approach we recommend for most existing Peninsula wood fences.
A significant portion of the San Francisco Peninsula falls within CAL FIRE-designated Fire Hazard Severity Zones. Hillside communities are most affected: unincorporated areas of San Mateo County, portions of Pacifica, Brisbane, San Bruno, Millbrae, and the San Francisco hillside neighborhoods carry Very High or High FHSZ designations. The updated FHSZ maps (effective April 2024 for State Responsibility Areas) reflect modern climate modeling and have expanded designated zones compared to earlier maps. Property owners can check their designation using CAL FIRE's Fire Hazard Severity Zone viewer.
California fire regulations apply in two jurisdictional frameworks. State Responsibility Areas (SRA) are unincorporated lands where CAL FIRE is the primary fire agency — these carry the strictest and most immediate Zone Zero obligations. Local Responsibility Areas (LRA) are cities and incorporated areas where the local fire department has jurisdiction. Very High FHSZ designations in LRAs also trigger WUI building code requirements, but the specific local amendments vary by city. We confirm the applicable standard for your property at the estimate.
San Mateo County Fire Department operates a dedicated WUI Risk Reduction program with active defensible space inspections in affected areas. The program is not purely advisory — repeated non-compliance can result in citations and forced abatement at the owner's expense. New construction and significant renovations in designated zones are reviewed for WUI compliance as part of the permit process, and material documentation is required. We maintain the product specifications and California State Fire Marshal listings for every non-combustible material we install and include that documentation in every permit package.
California's home insurance market has contracted significantly in high fire risk areas. Compliance with Zone Zero and WUI hardening requirements — including non-combustible fencing — is increasingly cited by insurers as a factor in underwriting decisions. While we cannot make representations about insurance outcomes, the regulatory trajectory is clear: non-combustible fencing in designated zones is moving from a best practice to a legal requirement.
Under Zone Zero guidelines and California Building Code Chapter 7A, any fence within five feet of a structure in a WUI or FHSZ-designated area must be non-combustible or meet ignition-resistant construction standards. For new construction in these zones, the requirement is immediate. For existing fencing, compliance will be required within the three-year window following the finalization of Zone Zero regulations — currently expected in 2026. The fence connection point at the house is the most critical element; this is where compliance is most strictly enforced and where the fire risk is highest.
A non-combustible material is one that will not ignite or contribute to a fire under normal conditions. For fencing, qualifying materials include steel, aluminum, iron, masonry, concrete block, and specific composite products that carry a California State Fire Marshal listing. Not all composite fencing products qualify — the material must be tested and listed. We maintain current SFM listings for the products we install and include that documentation in every permit package.
Fence permits in WUI and FHSZ zones require material documentation at the time of application — you cannot simply assert that a material is non-combustible. The building department review includes verification that specified materials appear on the California State Fire Marshal's Building Materials Listing. Inspectors confirm material compliance in the field. We handle the full permit application, provide the required material documentation, and coordinate the inspection for every project in a designated zone.
For most existing Peninsula wood fences, a full replacement is not required. The compliant approach is a non-combustible transition at the point where the fence attaches to or passes within five feet of the structure. An iron or steel gate and a short non-combustible panel at the house connection satisfies the Zone Zero requirement while preserving the existing wood fence for the remainder of the run. This is typically the most practical and cost-effective path for properties that were built with wood fencing before Zone Zero designations applied.
Steel and iron are the most common non-combustible fencing materials for Peninsula residential properties. They qualify for Zone Zero compliance without any additional testing or listing requirement, pair naturally with ornamental gate work, and are available in a range of profiles from flat-bar utilitarian to ornamental spear-top. Coastal exposure requires proper finish specification — hot-dipped galvanizing or multi-stage powder coating rated for the exposure level. All hardware is stainless or galvanized. See our ironwork and gates page for the full range of steel and iron options.
Powder-coated aluminum systems offer a lighter-weight alternative to steel with strong corrosion resistance in coastal environments. Aluminum is naturally non-combustible, holds powder coat finishes well, and is available in a wide range of panel profiles and colors. It is particularly well-suited for full-perimeter non-combustible installations where weight and maintenance are factors.
Masonry and CMU block systems provide the most substantial non-combustible perimeter available. They are well-suited for retaining applications, sloped lot boundaries, and properties where a permanent, high-mass solution is appropriate. Masonry fencing integrates naturally with our hardscape and retaining wall work — when grade management and fire compliance are both on the table, combining them into a single scope is usually the right approach.
Certain composite fencing products carry California State Fire Marshal listings that qualify them for use in WUI and FHSZ zones. These products offer a wood-like appearance with non-combustible performance. Not all composite products qualify — the SFM listing is what matters, not the manufacturer's marketing language. We specify only listed composite products for fire zone applications and include the listing documentation in the permit package.
The questions we hear most — before the estimate, during the build, and after.
We install redwood and cedar privacy fences, pool safety fences, ornamental iron and steel fences, automatic and manual gates, and non-combustible fencing for WUI and Zone 0 fire hazard zones. We select materials based on your site, HOA rules, and local requirements.
It depends on height, location, and your city. Most Peninsula cities allow fences up to 6 feet in rear and side yards without a permit, but front yard fences and fences near property lines often have stricter rules. We confirm what applies to your specific address at the estimate.
A properly installed redwood or cedar fence typically lasts 15 to 20 years with basic maintenance — occasional cleaning and a coat of sealer every few years. Heart redwood is naturally rot-resistant. Posts set in concrete with proper drainage are the single biggest factor in fence longevity.
Yes. We do partial replacements, post replacements, and section repairs regularly. We’ll assess the existing fence and let you know whether a repair or a full replacement is the better long-term value for your situation.
Zone 0 refers to the immediate 0–5 foot zone around a structure in a Wildland-Urban Interface (WUI) area. California fire code increasingly requires non-combustible materials in this zone. We install qualifying metal, concrete, and masonry fence systems for properties in Pacifica, Brisbane, and other hillside Peninsula cities subject to these regulations.
Yes. We install slide gates, swing gates, and driveway entry systems with electric operators. We handle the ironwork, the motor installation, and the wiring rough-in. For low-voltage and smart-home integration we coordinate with your electrician or can recommend one.
This varies by city and zoning. In most cases a fence can be built directly on the property line, but setback rules and neighbor consent requirements differ. We help you understand what’s allowed before the project starts so there are no disputes after.
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