Wildfires don’t check a home’s floor plan before they spread. They check what it’s built from. The 2025 Palisades, Eaton, Hurst, and Kenneth fires made that distinction unavoidable for thousands of California households. Material choice now shapes everything from permitting to insurance premiums. Building codes in wildfire-prone counties increasingly expect non-combustible or ignition-resistant assemblies. Choosing well before you break ground beats retrofitting later. This guide ranks five materials by real fire performance, not just marketing claims. Each one is evaluated on how it resists ignition, what it costs, and where it’s already being used. Use the table below as a