Fire-Resistant Building Requirements

California Chapter 7A in plain English — what your rebuild must include and what it costs.

If your property is in a Wildland-Urban Interface (WUI) area — which includes Altadena and Pacific Palisades — Chapter 7A of the California Building Code applies to your rebuild. This isn't optional. Every item below must be included in your plans for permit approval. The good news: fire-hardened homes are cheaper to insure and more resilient.

Chapter 7A Requirements by Component

Component	Requirement	Options	Est. Cost
Roof	Class A fire-rated roofing material required	Concrete tile, clay tile, metal, Class A asphalt shingles	$18,000–$55,000
Exterior Walls	Ignition-resistant construction or non-combustible material	Fiber cement siding (e.g., HardiePlank), stucco, concrete, brick	$30,000–$80,000
Vents	All vents must be ember-resistant (mesh ≤ 1/8 inch or approved ember-resistant vent)	Vulcan Vents, HY-C ember-resistant vents, intumescent vent covers	$2,000–$8,000
Windows & Skylights	Multi-pane windows with tempered glass on fire-exposed sides	Dual-pane tempered, fire-rated glass (for premium builds)	$10,000–$40,000 (upgrade over standard)
Decks & Exterior Floors	Ignition-resistant decking material within 10 feet of structure	Composite decking (e.g., Trex), concrete, tile, steel grating	$8,000–$30,000
Garage Door	Solid wood or metal door; automatic closer required	Steel panel garage doors, solid wood with fire-resistant rating	$2,500–$8,000

Defensible Space Zones

0–5 feet

Immediate Zone

Non-combustible materials only — gravel, concrete, pavers. No mulch, wood, or combustible plants.

5–30 feet

Intermediate Zone

"Lean, clean, green" — low-growing, well-irrigated, fire-resistant plants. No ladder fuels. Trees pruned 6 feet from ground.

30–100 feet

Outer Zone

Reduce fuel continuity — space plants and trees so fire can't travel easily. Remove dead vegetation. Maintain access for fire equipment.

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