Recently, EPIC-FSC (Emergency Preparedness in Calabasas – A Fire Safe Council) and wildfire mitigation experts from the City of Calabasas launched our new “Let’s Talk About…” series with a discussion about Home Hardening. Today, we’re focusing on another critical wildfire preparedness strategy: DEFENSIBLE SPACE.
What Is Defensible Space?
Defensible space is the buffer zone between your home and the surrounding vegetation, landscaping, and combustible materials on your property. While no preparation can guarantee a home will survive a wildfire, defensible space helps reduce wildfire intensity near structures and provides firefighters with a safer environment.
Why Defensible Space Matters
According to the Los Angeles County Fire Department, defensible space serves four key purposes:
- Reduces the risk of direct flame contact with a structure
- Reduces overall fire intensity and rate of spread near a structure
- Removes ember sources and provides space for embers to fall safely before reaching a structure
- Provides firefighters with a safe area for accessing and defending homes
In short, defensible space protects more than property. It also helps protect the firefighters who may one day defend your neighborhood.
Lessons from the Sandy Fire
The recent Sandy Fire offered a powerful reminder that wildfire conditions can shift rapidly and unpredictably. A resident who documented the fire from her backyard described how quickly the situation changed and how little time homeowners have once a wildfire is approaching. One of the strongest messages from the report was that wildfire preparation cannot begin when smoke appears on the horizon. The work must already be done.
The report also highlighted a reality firefighters know well: during a major wildfire, emergency resources may be stretched across multiple communities. Firefighters will do everything possible to protect homes, but properly prepared properties are often safer and easier to defend.
The Sandy Fire serves as an important reminder that defensible space is not a one-time project. It requires ongoing maintenance and attention year-round.
Understanding Defensible Space Zones
Zone 0: 0–5 Feet
Known as the Ember-Resistant Zone, this area is the most critical around your home.*
Remove:
- Dead plants and weeds
- Fallen leaves and pine needles
- Wood piles
- Combustible mulch
- Flammable outdoor furniture and decorations
Zone 1: 5–30 Feet
This area should be maintained to reduce fire intensity near structures.
- Remove dead vegetation
- Trim trees and shrubs
- Keep tree branches at least 10 feet from other trees and from roofs
- Reduce combustible vegetation near structures
Zone 2: 30–100 Feet
The goal is to reduce available fuel and slow fire spread.
- Cut annual grasses to a maximum height of 4 inches
- Remove dead vegetation
- Increase spacing between shrubs and trees
- Reduce dense vegetation that can carry fire
*California is expected to implement additional Zone 0 requirements as the State Fire Marshal finalizes new regulations. Watch for EPIC updates on this.
Additional Defensible Space Requirements
- Maintain at least 6 feet of vertical clearance between the ground and the lower tree branches
- Maintain at least 16 feet of vertical clearance above driveways and access roads to accommodate emergency vehicles
- Remove leaves, pine needles, and debris from roofs and gutters
- Maintain 10 feet of clearance to bare mineral soil around propane tanks and outbuildings
Why This Matters in Calabasas
All of Calabasas lies within a Very High Fire Hazard Severity Zone (VHFHSZ). Properties within designated Fire Hazard Severity Zones are subject to defensible space inspections conducted by the Los Angeles County Fire Department. The Department’s Defensible Space Unit enforces fire code requirements, coordinates inspections, and ensures compliance with wildfire safety standards.
Annual inspection fees are billed with property tax bills, and properties that fail to meet clearance requirements may ultimately be cleared by the county at the property owner’s expense.
A Shared Responsibility
We all want our homes and families to be safe. We also want our firefighters to be safe. During a wildfire, our hero firefighters do everything possible to protect your home and neighborhood. However, during major wildfire events, equipment and personnel may be deployed throughout the region.
That’s why the time to prepare your property is now—before a wildfire starts. Home Hardening helps protect your home. Defensible Space helps create the conditions that allow your home to be defended. Together, they give your property its best chance of surviving a wildfire.
Learn More
For specific, detailed, and up-to-date information on defensible space, consult the LA County Fire Department’s official website. The Department’s Defensible Space Unit enforces the Fire Code on brush clearance for improved parcels, coordinates inspections and compliance efforts with fire station personnel, and provides annual defensible space training to them.
For a firsthand account of the Sandy Fire and the lessons learned by local residents, visit the Agoura Hills Fire Safe Council website and read The Sandy Fire Report From My Backyard.
Stay safe, be prepared!
