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Illinois Energy Codes
Illinois Energy Conservation Code (20 ILCS 3125/15)
The Illinois Energy Conservation Code requires design and construction professionals to follow the latest published edition of the International Energy Conservation Code (IECC) including amendments adopted by CDB for all commercial and residential buildings in the State. The 2021 Illinois Energy Conservation Code print and electronic editions are available from the International Code Council (https://codes.iccsafe.org/)
Illinois Stretch Energy Code (20 ILCS 3125/55)
The Illinois Stretch Energy Code allows 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 2023 Illinois Stretch Energy Code print edition is available from the International Code Council (https://codes.iccsafe.org/). The electronic version will be available in mid January.
Additional information including training opportunities, interpretations and frequently asked questions can be found on the Illinois Environmental Protection Agency's website.
Upcoming Training Opportunities for Illinois Energy Codes are being provided by the Smart Energy Design Assistance Center. For more information, please use the following link: https://smartenergy.illinois.edu/events
2025 Illinois Stretch Energy Code Technical Advisor RFP The State of Illinois Capital Development Board intends for development of the 2025 Illinois Stretch Energy Code. The Board issues a Request for Proposal from qualified firms to serve as the 2025 Illinois Stretch Energy Code Technical Advisor. The successful firm will be responsible for providing technical assistance to the CDB and the Illinois Energy Conservation Advisory Council to develop, evaluate, and assess energy efficiency and emissions reducing measures into the State’s Stretch Energy Code.
Contact Information
Robert Coslow
Phone: 217-685-4079
TDD: 217-524-4449