Section 600.300  Illinois Energy Conservation Code

a)         The 2021 IECC, including published errata but excluding published supplements, available from the International Code Council at 200 Massachusetts Ave, NW Suite 250, Washington, DC  20001, phone:  1-888-ICC-SAFE (422-7233), www.iccsafe.org, is hereby incorporated into the Illinois Energy Conservation Code, as described in this Subpart as applicable to privately funded commercial facilities, with the modifications outlined in subsection (c).

b)         All incorporations by reference in this Section are of the cited standards as they existed on the date specified.  These incorporations include no later editions or amendments.

c)         Modifications to IECC

Under Section 15 of the EEB Act, when applying the Illinois Energy Conservation Code to privately funded commercial facilities, CDB may modify the incorporated standards to respond to the unique economy, population distribution, geography and climate of Illinois, as long as the objectives of the EEB Act are maintained. Modifications, additions or omissions to IECC are specified in Appendix A and are rules of the CDB and are not requirements of the IECC.

(Source:  Amended at 48 Ill. Reg. 14276, effective January 1, 2025)