Title 24 Resource Center

Guides to the parts of the California Energy Code that come up most often, written for people who do not do this for a living.

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Prescriptive vs Performance Compliance
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Keeping current

The California Energy Code is revised roughly every three years. The 2025 edition took effect on 1 January 2026 and applies to projects whose permit application is submitted on or after that date. These guides reflect the code currently in force.