# California — Which energy code each US state enforces for new homes: the IECC edition (or state equivalent) actually in force, with effective dates and amendments, from the state rules themselves

For California, energy code in force is 2022 Building Energy Efficiency Standards; effective date is January 1, 2023; adopting authority is California Energy Commission; statute / rule citation is Title 24, Part 6, verified against its source on 2026-08-18.

- **State:** California _(verified: appears in the quote below)_
- **Energy code in force:** 2022 Building Energy Efficiency Standards _(verified: appears in the quote below)_
- **Effective date:** January 1, 2023 _(verified: appears in the quote below)_
- **Adopting authority:** California Energy Commission _(verified: appears in the quote below)_
- **Statute / rule citation:** Title 24, Part 6 _(verified: appears in the quote below)_

## What the source says

> The 2022 Building Energy Efficiency Standards took effect January 1, 2023.

## Source

- https://www.energy.ca.gov/programs-and-topics/programs/building-energy-efficiency-standards

Last verified: 2026-08-18. Review by: 2027-02-14.
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