**UPDATES FOR 2026**

CAL FIRE Office of the State Fire Marshal's SOCIAL MEDIA post:

This week, the new 2025 edition of the California Wildland-Urban Interface Code (CWUI) was adopted. The new wildfire building code relocates current wildfire resiliency related sections into one central location within Part 7 of the California Building Code.

The various wildfire-related sections include existing Chapter 7A of the Building Code, Chapter 49 of the Fire Code (vegetation management around homes), and Chapter 337 of the Residential Code. The structure of the CWUI Code is modeled using the International Code Council’s International Wildland-Urban Interface Code. While the requirements remain the same, the reorganization and consolidation into one code is a major milestone for California making it a simpler process for builders and local officials across the state.

The new code takes effect on January 1, 2026.

The CAL FIRE – Office of the State Fire Marshal has a long-standing Wildland-Urban Interface (WUI) workgroup that completed the proposal for the adoption and will continue to meet to review and propose revisions. The success of the code since its adoption in 2008 has been the development process, which has always included all stakeholders at the table including fire officials, building officials, building industry, researchers, academics, manufacturers, as well as the public.

Wildfires have devastated California, but stronger building codes are making a difference.

Homes built under California’s wildfire regulations are 40% more likely to survive than older homes, according to a 2021 study.

Why it matters:

Fire-resistant roofs and other features protect new homes.

Even older homes benefit—if they’re near a newer home, their survival chances increases.

Research shows California’s wildfire building codes work to keep communities safer.

Read the article: https://bit.ly/3CZpCty

Stronger homes mean safer communities.

While this code is focused on new construction, all Californians should take steps to harden their home through retrofits. Learn more at: https://readyforwildfire.org/prepare.../hardening-your-home/

The new California Wildland-Urban Interface Code (CWUIC), based on the International Wildland-Urban Interface Code, was created by relocating chapters, sections and language from several parts of Title 24, including the California Building Code (Chapter 7A), California Residential Code (Section R337) and the California Fire Code (Chapter 49). Additionally, it incorporates other provisions from Title 24 (not relocated),  and sections from Title 14 (Natural Resources) and Title 19 (Public Safety) of the California Code of regulations, and sections from the Government Code, the Health and Safety Code, and Public Resources Code.

Section H107, Cross Reference Tool, was added to Appendix H of the CWUIC. It lists each section of the code and identifies the source document and section for each provision.

As part of the effort to consolidate language from the multiple areas of law and regulations, a reasonable amount of “clean-up” was made before codifying the language into the CWUIC. This consisted of clarifying intent, correcting minor errors from previous code cycles, and reorganizing sections to align with model code.

The State Fire Marshal (SFM) 12-7A-4 is required in any and all jurisdictions that reference the Wildland Urban-Interface (WUI) Code as well as the California Referenced Standards Code. These are typically referenced in areas identified as high-risk areas for wildland fires near residential/commercial areas. With the increasing occurrences and scale of wildland fires, it is paramount for manufacturers to research where their products are being placed and the applicable codes of where their products are being applied/installed.

Chapter 7A of the California Building Code is a special section that sets fire-resistant construction requirements for buildings located in Wildland-Urban Interface (WUI) areas—places where homes and structures are close to forests, grasslands, or other wildfire-prone vegetation.

This chapter focuses on reducing the risk of wildfire damage by requiring:

• Use of fire-resistant building materials for roofs, exterior walls, windows, and decks

• Specific construction details that help prevent ignition from embers and flames

• Requirements for defensible space and vegetation management around buildings

Basically, Chapter 7A is California’s detailed rulebook for making homes and buildings safer in wildfire zones to protect lives, property, and communities.

Section R337 outlines building design and construction requirements for new buildings (and certain remodels) located in Wildland‑Urban Interface (WUI) Fire Areas. Its goal is to ensure structures are more resistant to ignition from wildfire exposure

1. Applicable Areas:
   These provisions apply in areas designated as Fire Hazard Severity Zones or Wildland‑Urban Interface Fire Areas by enforcing agencies

2. Key Requirements Covered:

   • Fire-resistant materials and surface treatments (R337.3)

   • Roofing that resists ember intrusion (R337.5)

   • Ventilation openings protected by ember-resistant mesh (R337.6)

   • Ignition-resistant exterior walls, eaves, and porch ceilings (R337.7)

   • Fire-rated windows, doors, and skylights (R337.8)

   • Decking and walking surfaces near the building must use noncombustible or ignition-resistant materials (R337.9)

Purpose & Scope
Chapter 49 establishes minimum statewide standards designed to reduce the risk of life and property loss in areas where wildland and urban development meet—commonly known as Wildland‑Urban Interface fire areas.

This chapter is adopted by the California State Fire Marshal and applies to land designated as Very High, High, or Moderate Fire Hazard Severity Zones, within both State and Local Responsibility Areas.

Chapter 49 is a cornerstone of California’s wildfire mitigation framework. It integrates land-use planning, construction techniques, vegetation control, and emergency preparedness to help reduce wildfire ignition, slow its spread, and protect both lives and property in high-risk areas

The State Fire Marshal's Building Materials Listing Program (BML) was initially established to mandate approval and listing of fire alarm systems and devices before their sale or marketing in the state. Over time, it expanded to include various materials, such as roof coverings, wall assemblies, hardware, and more. Product approval involves rigorous testing, and companies must utilize SFM accredited laboratories for testing to list products in California. The SFM listing service provides essential information to building authorities, architects, engineers, contractors, and the fire service.

The BML often influences other states’ building material approvals.

Here’s why:

• The BML evaluates and lists building products that meet fire safety standards for use within CA.

• Because many states have similar fire safety concerns and codes, they often look to BML’s listings as trusted proof that a product is safe and compliant.

• This can speed up approvals elsewhere—manufacturers use a BML listing to help get their products accepted in other states without repeating all the testing.

• Some states even officially recognize or adopt BML listings as part of their own approval process.

IN LAYMEN’S TERMS: BML listings act like a trusted “stamp of approval” that can carry weight beyond the state that issued them.