The technical requirements are still in effect, but they have moved. Under the 2025 Title 24 cycle effective January 1, 2026, the Building Standards Commission deleted Chapter 7A from the California Building Code and relocated the provisions into Part 7, the new California Wildland-Urban Interface Code. The Chapter 7A technical content carries forward almost unchanged into CWUIC Chapter 5, so the assemblies your rebuild must meet are essentially the same. Only the citation changed.

Yes. Wildfire construction requirements are mandatory in State Responsibility Area lands classified Moderate, High, or Very High Fire Hazard Severity Zone, and in Local Responsibility Area Very High Fire Hazard Severity Zones. Altadena rebuild parcels fall within this footprint. Confirm your specific parcel's current zone with LA County Building and Safety, since CAL FIRE updated its maps in 2024 and 2025.

The code addresses the exterior components most vulnerable to wildfire: roof coverings including valleys and gutters, exterior walls and siding, windows and glazing, exterior doors, decks and appendages, eaves and soffits, and vents. It requires ignition-resistant or noncombustible materials and ember-resistant vents with 1/16 to 1/8 inch mesh screening.

Attic and foundation ventilation openings must resist ember intrusion. Vents must be covered with noncombustible corrosion-resistant mesh with openings between 1/16 inch and 1/8 inch, or use a listed ember-resistant vent assembly. Vents are prohibited in soffits, eave overhangs, and other locations where they would be directly exposed to flame or embers, unless a listed assembly is used.

Yes. Prior to building permit final approval, the property must comply with the vegetation management requirements of California Fire Code Section 4906, including Public Resources Code 4291 or Government Code Section 51182. Defensible space landscaping is a condition of closing out your permit, not an optional upgrade, so design and budget it alongside the house.

No. Like-for-like status in LA County affects zoning review, not building code compliance. A like-for-like replacement structure is not required to comply with current Zoning Code requirements, but it must still be built to current fire-hardening building standards. These are two separate tracks and homeowners frequently conflate them.

Zone 0 is the ember-resistant zone: the first five feet measured out from a home's exterior walls and from attached decks, stairs, and pergolas. The California Board of Forestry and Fire Protection unanimously approved the final Zone 0 regulations on August 19, 2026, the first statewide rule in the nation governing that band, and the rules are expected to become legally effective around the end of September 2026. The rule covers every property in a State Responsibility Area and properties mapped Very High Fire Hazard Severity Zone inside city and county fire jurisdictions. Much of the Altadena, Pasadena, La Cañada, and Sierra Madre foothill belt is mapped Very High, so most Altadena rebuilds should assume Zone 0 applies.

No. Existing homes phase in over five years, with day-one duties covering roof and gutter debris, dead and dying branches, and chimney clearances, then further requirements at three years and a Phase 2 window that local fire agencies can extend to five. New construction gets no phase-in: building permit applications submitted after the effective date must meet every Zone 0 requirement immediately. That includes Altadena rebuilds still in permitting, which makes Zone 0 a live design question rather than a future maintenance chore.

Bark mulch, wood chips, and fallen leaves or needles must be removed from the first five feet, along with woody shrubs such as juniper, rosemary, and hedges, any vegetation under eaves or within two feet of windows, doors, and vents, combustible planters, firewood and stored combustibles, and combustible fence or gate sections attached to the house. Permitted instead are decomposed granite, pea gravel, stone, and concrete; lawns and ground covers under three inches; small spaced non-woody plants three to eighteen inches such as poppies, bulbs, creeping thyme, and non-thatching succulents; and noncombustible pots up to five gallons. Existing healthy trees can stay if pruned clear of eaves, ten feet from chimneys, five feet above the roof, with ladder fuels removed.