Code Level
- Commercial Energy Code - 2021 IECC, with amendments (effective 1/16/24)
- Residential Energy Code - 2021 IECC, with amendments (effective 1/16/24)
Authority
Authorized by – Statute. 2009's Energy Efficient Building Act modified the previous Energy Efficient Commercial Building Act to require the latest version of the IECC as the building energy code for both commercial and residential buildings. The statute is found at 20 ILCS 3125. Administrative rules for the Illinois Energy Conservation Code are found at 71 IAC 600.
Oversight – The building codes, including the energy code, are overseen by the Capital Development Board, and more specifically by the CDB's Division of Building Codes & Regulations. The Illinois Energy Code Advisory Council meets regularly to evaluate energy code issues and provide advice to the board.
Code Change Process – Regulatory and Legislative. The Capital Development Board reviews and adopts the latest model code within a year of its release. The rule adopting the new code must then be approved by the General Assembly's Joint Committee on Administrative Rules (JCAR).
Code Change Cycle - Every 3 years, concurrent with updates to the model energy code.
Compliance
Enforcement - The Capital Development Board, along with the Department of Commerce and Economic Opportunity are responsible for defining compliance procedures. Code enforcement is the duty of the local jurisdiction, who must meet minimum compliance documentation requirements.
Implementation/Compliance Studies – The Illinois Department of Commerce and Economic Opportunity conducted a residential and commercial building energy code baseline compliance study in 2014. Click here for a full report.