# Oregon — 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 Oregon, energy code in force is Chapter 11 - Energy Efficiency; iecc edition basis is 2021 International Residential Code (IRC); effective date is Oct. 1, 2023; adopting authority is Oregon Building Codes Division; statute / rule citation is 2023 Oregon Residential Specialty Code (ORSC), verified against its source on 2026-08-18.

- **State:** Oregon _(verified: appears in the quote below)_
- **Energy code in force:** Chapter 11 - Energy Efficiency _(verified: appears in the quote below)_
- **IECC edition basis:** 2021 International Residential Code (IRC) _(verified: appears in the quote below)_
- **Effective date:** Oct. 1, 2023 _(verified: appears in the quote below)_
- **Adopting authority:** Oregon Building Codes Division _(verified: appears in the quote below)_
- **Statute / rule citation:** 2023 Oregon Residential Specialty Code (ORSC) _(verified: appears in the quote below)_

## What the source says

> <https://www.oregon.gov/bcd/codes-stand/Pages/alternate-methods.aspx> Statewide alternate methods <https://www.oregon.gov/bcd/codes-stand/Pages/code-interps.aspx> Statewide code interpretations <https://www.oregon.gov/bcd/codes-stand/Pages/appeal-decisions.aspx> Appeals <https://www.oregon.gov/bcd/codes-stand/Pages/design-criteria.aspx> Oregon design criteria hub <https://www.oregon.gov/bcd/codes-stand/Pages/code-adoption.aspx> Code adoption and review Adopted residential energy code 2023 Oregon Residential Specialty Code (ORSC) <https://www.oregon.gov/bcd/codes-stand/Pages/https&#58;//codes.iccsafe.org/content/ORRC2023P1/chapter-11-energy-efficiency> Chapter 11 - Energy Efficiency The provisions of Chapter 11 of the ORSC regulate the building thermal envelope, as well as the design, construction and selection of heating, ventilating and air-conditioning systems, piping insulation, lighting and power required for the purpose of effective conservation of energy within a building or structure governed by this code. Effective&#58; Oct. 1, 2023 with 6 month phase-in period Mandatory&#58; April 1, 2024 Based model code&#58; 2021 International Residential Code (IRC)

## Source

- https://www.oregon.gov/bcd/codes-stand/Pages/energy-residential-compliance.aspx

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