TO: Board of Supervisors
FROM: Brian Bordona, Director of Planning, Building and Environmental Services
REPORT BY: David Giudice, Chief Building Official
SUBJECT: Introduction and Notice of Public Hearing for adoption of the 2025 California Building Standards Code
RECOMMENDATION
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Introduction and intent to adopt the 2025 California Building Standards Code as approved by the California Building Standards Commission, including the amendment of various chapters of Title 15 of the Napa County Code; and notice of a public hearing to be held on December 9, 2025, to consider the adoption of the 2025 Building Standards Code. (No Fiscal Impact)
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BACKGROUND
The State of California (California Building Standards Commission (CBSC)) officially adopted the 2025 California Building Standards Codes, Title 24, California Code of Regulations, in July of this year. The new codes will become mandatory on January 1, 2026. The Title 24 codes are updated and adopted every three years. This allows for the codes to improve and adjust to the newest materials, methods of construction, and technological advances in the industry, and provide improved response to natural disasters. The list below identifies the Title 24 Codes and the model codes upon which they are based, as applicable.
1) 2025 California Building Code (Title 24, Part 2), based on 2024 International Building Code (ICC).
2) 2025 California Residential Code (Title 24, Part 2.5), based on the 2024 International Residential Code (ICC).
3) 2025 California Electrical Code (Title 24, Part 3), based on the 2023 National Electrical Code (NFPA).
4) 2025 California Mechanical Code (Title 24, Part 4), based on the 2024 Uniform Mechanical Code (IAPMO).
5) 2025 California Plumbing Code (Title 24, Part 5), based on the 2021 Uniform Plumbing Code (IAPMO).
6) 2025 California Administrative Code (Title 24, Part 1).
7) 2025 California Energy Code (Title 24, Part 6).
8) 2025 California Wildland-Urban Interface Code (Title 2...
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