Effective January 1, 2026 If you own or manage commercial buildings, public facilities, or public housing in California, there are important updates you need to know about. The 2025 California Building Code Chapter 11B includes changes that became effective on January 1, 2026. This guide breaks down all the changes from 2022 to 2025 in simple, easy-to-understand language—with complete explanations so you don't have to search through the code yourself. Complete List of 2025 11