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Illinois Energy Conservation Code
(20 ILCS 3125/15)
Privately Funded Commercial Facilities must comply with the Illinois Energy Conservation Code per 20 ILCS 3125. See Subpart C of the Illinois Energy Code for more information. The 2021 edition of the IECC as amended went into effect on 1/1/24.
Residential Buildings must comply with Illinois Energy Conservation Code per 20 ILCS 3125. See Subpart D of the Illinois Energy Code for more information. The 2021 edition of the IECC as amended went into effect on 1/1/24.
| The Illinois Energy Conservation Code (Base Code) is available online at https://codes.iccsafe.org/ Amendments to the Model Code are shown below. |
- 2024
- The 2024 Illinois Energy Conservation Code (Base Code) has been submitted to the Joint Committee on Administrative Rules and is in the final stages of being codified into IL law. The effective date is planned for later this year.
- 2024 IECC Cost Effective Analysis