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Illinois Energy Conservation Code
(20 ILCS 3125/15)
State Funded Facilities must comply with the IECC per 20 ILCS 3125. See Subpart B of the Illinois Energy Conservation Code for more information. The 2018 edition of the IECC went into effect on 7/1/19.
Privately Funded Commercial Facilities must comply with IECC per 20 ILCS 3125. See Subpart C of the Illinois Energy Conservation Code for more information. The 2018 edition of the IECC went into effect on 7/1/19.
Residential Buildings must comply with IECC per 20 ILCS 3125. See Subpart D of the Illinois Energy Conservation Code for more information. The 2018 edition of the IECC went into effect on 7/1/19.
- 2021
- The 2021 Illinois Energy Conservation Code will go into effect 1/1/24.
- Illinois Specific Amendments
- Illinois Specific Amendments with Modifications Shown