Illinois Stretch Energy Code

The Illinois Stretch Energy Code rules have been completed and will become effective January 1, 2025.  CDB is currently working with ICC on publishing the 2023 Illinois Stretch Energy Code and should be available by year end.  An ASHRAE 90.1 specific version is also in development.

The Residential Stretch Code is based on the 2021 IECC with amendments to ensure the site energy indexes in CEJA are being met.   A draft of the proposed amendments can be viewed here Illinois Residential Stretch Energy Code Draft

Illinois Cost-Effectiveness Analysis

The Commercial Stretch Code is based on the 2024 IECC Final Draft with amendments to ensure the site energy indexes in CEJA are being met.   A draft of the proposed amendments can be viewed here Illinois Commercial Stretch Energy Code Draft

Development of the Illinois Stretch Energy Code shall be completed by December 31, 2023 and available for adoption by municipalities by June 30, 2024.

Illinois Public Act 102-0662 The Climate and Equitable Jobs Act (CEJA) requires The Board, in consultation with the Agency, shall create and adopt the Illinois Stretch Energy Code, to allow municipalities and projects authorized or funded by the Board to achieve more energy efficiency in buildings than the Illinois Energy Conservation Code through a consistent pathway across the State. The Illinois Stretch Energy Code shall be available for adoption by any municipality and shall set minimum energy efficiency requirements, taking the place of the Illinois Energy Conservation Code within any municipality that adopts the Illinois Stretch Energy Code.

The Illinois Stretch Energy Code defines energy efficiency measures that meet the levels defined by CEJA.  CEJA sets energy efficiency levels based on a site energy index relative to the 2006 International Energy Conservation Code (IECC).

By 6/30/24 must have a site energy index no greater than .60 of the 2006 IECC.

By 12/31/25 must have a site energy index no greater than .50 of the 2006 IECC.

By 12/31/28 must have a site energy index no greater than .44 of the 2006 IECC.

By 12/31/31 must have a site energy index no greater than .39 of the 2006 IECC.

By 6/30/24 must have a site energy index no greater than .50 of the 2006 IECC.

By 12/31/25 must have a site energy index no greater than .40 of the 2006 IECC.

By 12/31/28 must have a site energy index no greater than .33 of the 2006 IECC.

By 12/31/31 must have a site energy index no greater than .25 of the 2006 IECC.