What Zone Zero actually covers
Zone Zero — the ember-resistant zone — is the band from zero to five feet measured out from any structure: the house, the garage, a deck, or attached stairs. The intent is to remove the material that wind-driven embers land on and ignite first. Assembly Bill 3074 added this zone to California’s defensible space law, and the Board of Forestry and Fire Protection has been developing the implementing regulations.
For fencing, the practical question is simple: does any part of your fence or gate come within five feet of a structure? If it does, that section is the part worth rethinking. A fence running along the back property line, fifty feet from the house, is a different conversation than a wood gate attached to the side of the garage.
Why this matters more in Ramona than most places
Ramona sits in the San Diego backcountry, and large portions of the area carry a Very High Fire Hazard Severity Zone designation. Properties here tend to be on acreage with native brush at the margins, long driveways, and outbuildings — exactly the conditions the ember-resistant zone was written for. Homeowners in town are also increasingly being asked about defensible space by insurers.
Materials that do and do not qualify
Combustible — rethink within five feet
- Wood fence (cedar, redwood, pine)
- Vinyl and PVC
- Composite panels
- Fire-retardant treated wood
- Bamboo and reed screening
Non-combustible — suitable for the zone
- Wrought iron and steel
- Powder-coated aluminum
- Galvanized chain link
- Masonry and concrete block
- Gabion (stone in wire mesh)
Fence Tech installs wrought iron, powder-coated aluminum, and galvanized chain link, including matching driveway gates, so the section closest to the house can be swapped to a non-combustible material without replacing the entire fence line.
Verify before you spend
Check whether your property is in a designated zone
Use the official sources rather than a guess. Hazard designations are drawn parcel by parcel, and neighboring properties can fall differently.
CAL FIRE hazard severity maps
Official state fire hazard severity zone maps from the Office of the State Fire Marshal.
San Diego County fire resources
County-level defensible space guidance and local fire authority contacts.
Fence Tech is a fencing contractor, not a fire agency. Confirm requirements for your parcel with your local fire authority before making decisions.
FAQ
Zone Zero questions
Do I need to replace my entire fence?
No. Only fence and gate sections within five feet of a structure need to be non-combustible. Fence beyond that five-foot band can stay as it is.
Can I use fire-retardant treated wood instead?
No. Fire-retardant treated wood is still combustible and does not pass ASTM E136 non-combustibility testing, so it does not satisfy Zone Zero.
What about a fence shared with my neighbor?
If your neighbor’s house sits within five feet of the shared fence, that section falls inside their Zone Zero even if your house is farther away. Fence Tech splits shared-fence costs and bills each household separately.
When does this apply?
The Board of Forestry and Fire Protection is finalizing Zone Zero regulations under AB 3074. New construction in Very High Fire Hazard Severity Zones is expected to comply first, with existing homes phased in afterward. Check the current state guidance for the date that applies to your property.
Does Fence Tech build non-combustible fence?
Yes. Wrought iron, powder-coated aluminum, and galvanized chain link are all non-combustible, and Fence Tech installs all three, including matching driveway gates.
Want the five-foot section changed out?
We will walk the property, tell you which sections actually sit inside the zone, and quote non-combustible replacements for just those runs.