Zone Zero Fire Safety Compliance


Here are three blog outlines focused on non-movable items in Zone Zero, incorporating the latest California regulatory stances on compliance and the "grandfathering" of existing fixtures.


Blog 1: The AC Dilemma—Hardening Your HVAC for Zone Zero


Theme: Balancing essential home cooling with the mandate to eliminate fuel sources within the first five feet.

  • The Regulatory Reality: While AB 3074 requires a nearly combustible-free zone within 5 feet of the home, state boards have proposed a "pragmatic approach" for essential, non-movable utilities like HVAC units and heat pumps.
  • Grandfathering vs. Compliance: There is technically no grandfathering for non-compliant items once the three-year phase-in period ends (estimated 2027–2028 for existing homes). However, inspectors may prioritize "educational outreach" for ground-mounted units rather than forced relocation.
  • What Must Go:
  • Window-mounted AC units: These are often listed as high-risk items that should be removed or relocated because they create a direct pathway for embers into the structure.
  • Combustible debris: Leaves and pine needles trapped in unit fins or under the condenser must be cleared regularly.
  • Compliance Upgrades:
  • Non-Combustible Base: Ensure the unit sits on a concrete pad or gravel rather than wood mulch or a plastic riser.
  • Enclosures: If a unit is screened for aesthetics, the screening must be made of non-combustible metal or masonry rather than wood lattice.


Blog 2: Pools, Pumps, and Pipes—Fire-Proofing Your Backyard Utilities


Theme: Ensuring your pool equipment and irrigation valves don't become the "fuse" that brings a fire to your foundation.

  • The Hidden Hazard: Pool pumps and irrigation valve boxes are often housed in plastic or wood enclosures that sit directly against the home’s siding.
  • Grandfathering Status: Like AC units, existing pool equipment will likely be subject to the same standards as new construction after the phase-in period. You cannot "grandfather" a combustible wood enclosure just because it was built before the law.
  • Items to Remove or Upgrade:
  • Wood Enclosures: Replace any wooden "dog-house" style covers for pumps with non-combustible metal or masonry options.
  • Plastic Valve Box Lids: In very high-risk zones, local authorities (AHJs) may require plastic lids in Zone Zero to be replaced with metal or heat-resistant alternatives.
  • Compliance Strategy:
  • The 5-Foot Apron: Surround all fixed pool and irrigation equipment with a 5-foot perimeter of gravel, rock, or concrete to prevent ground fires from reaching the machinery.
  • Clear the "Flashy Fuels": Keep the area around pump motors free of wind-blown trash and dry leaves.


Blog 3: Rain Barrels and Water Storage—Is Your Conservation Effort a Fire Risk?


Theme: Addressing the conflict between water conservation tools and ember-resistant standards.

  • The Conflict: Rain barrels are essential for the "watershed approach" to landscaping, but standard 55-gallon barrels are typically made of combustible food-grade plastic.
  • Grandfathering Restrictions: Plastic rain barrels are explicitly identified in many local and state checklists as items that should be removed from Zone Zero. Because they are often considered "movable" (even if heavy when full), they are unlikely to receive any grandfathering exceptions.
  • Rules for Compliance:
  • The 5-Foot Rule: Plastic barrels and tanks should be relocated at least 5 to 10 feet away from the structure's exterior walls.
  • Vertical & Horizontal Separation: If a storage tank remains near the home, it must have a 0-to-5-foot non-combustible zone (gravel or pavers) underneath and around it.
  • Recommended Upgrades:
  • Switch to Metal: For rainwater catchment within the critical 5-foot zone, homeowners should transition to corrugated metal tanks or other non-combustible storage options.
  • Debris Guards: Install metal micro-mesh covers over barrel inlets to prevent embers from igniting accumulated debris inside the tank.


Summary of Grandfathering in California


Current guidance from CAL FIRE and the State Board of Forestry indicates that all properties in High or Very High Fire Hazard Severity Zones must eventually meet the same Zone Zero standards.



  • New Construction: Must comply immediately.

  • Existing Structures: Generally granted a three-year grace period to retrofit or relocate items.

Exceptions: The only items generally allowed to stay in Zone Zero are mature, healthy trees (if pruned 5–10 feet away from the structure) and non-combustible hardscape. Fixed utilities like AC units are "tolerated" through a focus on maintenance rather than mandatory removal, provided they are cleared of all surrounding combustible fuels.