Wildfire zones and electrical work

Fire zones were drawn for building and brush rules, not for wiring. But they decide which rules the city fire office enforces, how likely your power is to be cut in high wind, and how much backup power is worth to you. Here is how the pieces fit.

Step one: know your zone

CAL FIRE maps Fire Hazard Severity Zones, and the Very High category (VHFHSZ) drives the strictest rules. The maps change. CAL FIRE’s 2025 update put more of the Santa Clarita Valley in Very High zones than before. Claremont’s council adopted its own updated map on July 22, 2025, and the city offers a lookup that shows the zone and the fire department for a given parcel. Look up your address, not just your city. Zones often cut through a single neighborhood.

What Chapter 7A is

Chapter 7A of the California Building Code sets minimum standards for new construction in wildland-urban interface areas. It aims to keep flames and burning embers from entering a building. The rules cover roofing, vents, eaves, siding, windows and decks. The State Fire Marshal keeps a Building Materials Listing of products that meet the chapter. It mostly shapes new houses, additions and rebuilds, so it matters most when you add an ADU, rebuild after a loss, or open up exterior walls. For a panel swap inside a garage, the electrical code is the main rulebook. Your building department can confirm which parts apply to the job.

Zone 0, the five feet next to the house

In August 2026 the Board of Forestry adopted emergency “Zone 0” rules under AB 3074. They create an ember-resistant zone reaching five feet from walls, roofs, attached decks and stairs. They remove bark mulch, leaves, firewood and similar fuel from that strip. As of October 29, 2026, the rules were filed with the Office of Administrative Law on August 28 and were not yet confirmed as in effect. New structures must wait for the Board’s fuels guidance, and existing homes get a phase-in of roughly three to five years. Outdoor meters, subpanels and equipment sit inside that five-foot strip on many houses. The published summaries do not say how Zone 0 treats them, so ask your fire authority before moving or boxing in equipment.

Covered conductor and what it means for the pole line

Southern California Edison has been replacing bare overhead wire with covered conductor in high fire risk areas. Its April 2026 plan amendment lists targets of 200 circuit miles in 2026, 280 in 2027 and 295 in 2028, with some undergrounding targets reduced. Pasadena Water and Power’s wildfire plan names covered-conductor work around Glen Oaks Boulevard, Rosemont Avenue and Sequoia Drive. This is utility-side work. Your electrician only works from the meter inward, but the new wire may be why a planned outage notice shows up at your door.

Shutoffs follow the zones

A zone map does not tell you if the utility will cut power, but it points the same way. On October 2, 2026, SDG&E began shutting off power to about 35,000 customers in north, east and south San Diego County, and Poway was among the largest cities listed. See the shutoff explainer and the prep checklist.

What this means for electrical work in a fire zone

• Panel and service upgrades: the process is the same as elsewhere, but fire-district inspections and plan comments can add steps. Ask the city at the start. See the utility coordination guide.
• Outdoor wiring and lights: keep fixtures and junction boxes away from dry brush and combustible siding, and follow whatever Zone 0 guidance your fire authority gives.
• Backup power: a battery has no fuel storage or exhaust. A generator can work but needs safe placement and careful fueling in red flag weather. Compare them in the generator vs battery guide and the backup power hub.
• After a loss: rebuilds often include new service, and some utilities push for underground lines. Plan the meter spot early.

Local pages that note fire history: Santa Clarita, Poway and Pasadena.

Questions to ask the city or fire district

Short questions get short answers. Try these:

1. Is my parcel in a Very High Fire Hazard Severity Zone, and which agency serves it?
2. Does Chapter 7A apply to this job, or only to new buildings and additions?
3. Are there Zone 0 rules for my lot, and do they cover the meter, subpanel or outdoor equipment?
4. Does the fire district need to review the plans or inspect the work?
5. Is the utility planning work on my street that could change the meter or pole?

Write the answers on the permit paperwork or in an email so your electrician can build the quote around them. Rules change, and the 2025 map updates already moved some addresses into a stricter zone.