Agencies
Services
Illinois Stretch Energy Code
(20 ILCS 3125/55)
State Funded Facilities must comply with the Illinois Commercial Stretch Energy Code per 20 ILCS 3125. See Subpart B of the Illinois Energy Code for more information. The 2023 Illinois Stretch Energy Code went into effect on 1/1/25.
Privately Funded Commercial Facilities must comply with the Illinois Commercial Stretch Energy Code per 20 ILCS 3125 where adopted by the local municipalty. See Subpart C of the Illinois Energy Code for more information. The 2023 Illinois Stretch Energy Code went into effect on 1/1/25.
Residential Buildings must comply with the Illinois Residential Stretch Energy Code per 20 ILCS 3125 where adopted by the local municipalty. See Subpart C of the Illinois Energy Code for more information. The 2023 Illinois Stretch Energy Code went into effect on 1/1/25.
| The Illinois Stretch Energy Code is available online at https://codes.iccsafe.org/ Amendments to the Model Code are shown below. |
- 2025
- The 2025 Illinois Stretch Energy Code is now under development. Additional information can be found on the 2025 Stretch Code Proposals page.
Stretch Code Background
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).
Commercial Buildings
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.
Residential Buildings
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.