Staying informed about the latest updates to California’s building codes is essential for homeowners—especially when it comes to seismic safety. The 2025 code cycle introduces new seismic design criteria, retrofit requirements, and access to retrofit incentives. This guide breaks down the key changes, their implications, and actionable steps you can take to protect your home and family.

1. Updated Seismic Design Requirements: Stronger Foundations and Structures

California’s 2025 Building Code (Title 24, Part 2) includes significant enhancements to seismic structural requirements. Among the most notable changes:

• Reduced Seismic Load Limits: Seismic design forces have been lowered to 75% of previous levels to align with ASCE 41 standards, ensuring better performance during earthquakes.(Department of General Services)
  
• Enhanced SWOF (Soft, Weak, Open-Front) Provisions: Structures with open ground floors—like garages or shop fronts—now require stricter reinforcement to improve structural resilience.(Contractor Accelerator)
  
• Mandatory Cripple Wall Bracing: Homes with raised foundations undergoing remodels or additions must now include reinforced cripple walls—historically one of the most vulnerable points during quakes.(Montclair Construction)
  

These measures raise the standard for new construction and substantial remodels, enhancing safety across residential structures.

2. Permitting Changes and Legislative Developments

While code updates push toward higher standards, recent legislation may introduce temporary limitations:

• California Assembly Bill 306: This bill proposes a temporary pause on adopting or modifying building standards for residential units from June 1, 2025 to June 1, 2031. If enacted without amendment, it could stall future advances in seismic safety. Structural engineering bodies such as EERI have voiced opposition unless seismic-risk-oriented ordinances remain exempt.(EERI)
  

Homeowners and builders should monitor the status of AB 306 closely, as its outcome could impact future code enforcement and flexibility.

3. San Francisco Example: Mandatory Seismic Screening for Concrete Buildings

While statewide codes evolve, local jurisdictions are taking action on earthquake resilience:

• San Francisco Ordinance: Owners of thousands of non-ductile concrete and tilt-up buildings must conduct seismic screenings within 18 months. This is a proactive move to identify vulnerable structures—especially in high-risk areas like SoMa and the Tenderloin.(San Francisco Chronicle)
  

Although this requirement currently applies only to San Francisco, it illustrates the growing emphasis on preemptive seismic safety across California.

4. Grants and Incentives to Retrofit Seismic Risk Homes

Several programs continue to support homeowners seeking to improve seismic resilience:

• Earthquake Brace + Bolt (EBB): Offers grants up to $3,000 for bolting and bracing older homes (typically pre-1980) to their foundations. Eligibility varies by ZIP code.(Earthquake Authority, Chamberlin Real Estate School)
  
• Earthquake Soft-Story (ESS) Grants: Up to $13,000 available for reinforcing homes with living spaces over garages or substandard first-floor structures.(Earthquake Authority, CRMP)
  

These grants can partially or nearly fully fund retrofit projects, often improving both safety and insurance premiums.

5. What Homeowners Should Do Now

Understand Your Home’s Vulnerabilities

Start with a comprehensive seismic evaluation—particularly if your home is older, has a raised foundation, or features soft-story construction. Local contractors or retrofit specialists can identify weak points like cripple walls or unbolted foundations.(Unlimited Drilling)

Apply for Seismic Retrofit Grants

If eligible, register for EBB or ESS programs during open enrollment. Verify your ZIP code and property type to determine eligibility, and prepare documentation for a fast application process.(Chamberlin Real Estate School)

Work with Seismic-Aware Professionals

When planning remodels or additions, work with structural engineers and contractors familiar with the 2025 seismic code requirements. Ensure cripple wall bracing, foundation bolting, and open-ground-level reinforcement are included in plans and permit filings.

Monitor AB 306 Progress

Subscribe to updates from organizations like EERI or SEAOC to track whether AB 306 will restrict future seismic code updates. Understanding the timeline can inform your planning and project scheduling.(EERI)

Stay Vigilant Even in Other Jurisdictions

While not mandatory statewide, San Francisco’s seismic screening ordinance indicates potential trends. It’s advisable to stay informed about local seismic mandates, especially in high-risk regions like LA County or the Bay Area.(San Francisco Chronicle)

Summary at a Glance

Final Thoughts

The 2025 earthquake code changes in California represent a meaningful stride toward safer homes and resilient communities. While challenges like AB 306 and localized screening mandates exist, homeowners have a clear path: understand your home’s vulnerabilities, leverage retrofit programs, and partner with professionals who understand seismic safety.