Section 600.110  Adoption and Modification of the Code

a)         The purpose of the Illinois Energy Conservation Code is to implement Section 15 of the Energy Efficient Building Act [20 ILCS 3125] that requires CDB to officially adopt, as a minimum requirement for State and commercial structures and as a minimum and maximum requirement for residential buildings, the 2021 International Energy Conservation Code, including all published errata but excluding any published supplements, to apply that Code to all commercial and residential structures in Illinois, and to assist local code officials with enforcing the requirements of the Code. The 2021 Illinois Energy Conservation Code will become effective on adoption of this rulemaking.

b)       This Code as described in Subpart B (State facilities) is effective July 26, 2004.  This Code as described in Subpart C (privately-funded commercial facilities) is effective April 8, 2007. The Code as described in Subpart D (residential buildings) is effective January 29, 2010.

c)         Application of the Code

1)         State Facilities.  The Code as described in Subpart B of this Part applies to all State facilities for which money has been appropriated or authorized by the General Assembly.

2)         Privately Funded Commercial Facilities and Residential Buildings.  The Code as described in Subparts C and D of this Part applies to any new building or structure in this State for which a building permit application is received by a municipality or county.  [20 ILCS 3125/20] 

A)        Additions, alterations, renovations or repairs to an existing building, building system or portion thereof shall conform to the provisions of the Code as they relate to new construction without requiring the unaltered portion of the existing building or building system to comply with the Code.  [20 ILCS 3125/20(c)]

B)        All exceptions listed in the Code related to additions, alterations, renovations or repairs to an existing building are acceptable provided the energy use of the building is not increased.

d)        This Code, together with the standards incorporated by reference in this Part, has the force of a building code and is administrative law applicable in the State of Illinois.

(Source:  Amended at 47 Ill. Reg. 17974, effective November 27, 2023)