Builtech Construction broke ground on an 850-square-foot ADU in San Jose that set a new benchmark for residential fire safety across California. This project became the first in the city built to Type 1A standards, the highest fire-resistance classification available under state building codes, through advanced Insulated Concrete Form technology.
The ICF system stacked lightweight foam blocks like oversized building blocks before crews inserted rebar and poured concrete to create a solid non-combustible core. The resulting walls delivered exceptional protection against fire spread while adding seismic strength, soundproofing, pest resistance, and energy efficiency far beyond traditional wood-frame construction.
The build came together at roughly $350,000, matching costs for conventional methods in the area. Additional features such as fire-resistant windows, a metal roof structure, and fire-rated vents completed the resilient design ready for today’s denser neighborhoods.
ADUs are a key avenue for growing the San Jose housing supply and lowering costs. Any technological advances here will have an amplified impact on our city.
