R307 Storm Shelters — 2025 California Residential Code
California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-09-26 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Residential Code (Title 24, Part 2.5) § R307 · Effective January 1, 2026 · Official source: Building Standards Commission
R307.1 General.¶
This section applies to the design, construction and installation of storm shelters where constructed as either separate detached buildings or rooms or spaces within buildings for the purpose of providing protection from tornadoes, hurricanes and other severe windstorms.
R307.2 Construction.¶
Storm shelters shall be constructed in accordance with this code and ICC 500.
R307.2.1 Sealed documentation. The construction documents for all structural components and impact protective systems installed in storm shelters shall be prepared and sealed by a registered design professional indicating compliance with ICC 500.
Exception: Storm shelters, structural components and impact-protective systems that are listed and labeled to indicate compliance with ICC 500.
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