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 2021 edition of the IECC as amended went into effect on 1/1/24.

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 2021 edition of the IECC as amended went into effect on 1/1/24.

Residential Buildings must comply with IECC per 20 ILCS 3125. See Subpart D of the Illinois Energy Conservation Code for more information. The 2021 edition of the IECC as amended went into effect on 1/1/24.