Building Energy Code (Illinois)

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Program Information

Place Illinois
Program Name Illinois Building Energy Codes
Program Type Building Energy Code
Incentive Types Comprehensive Measures/Whole Building
Sectors Commercial, Residential

Much of the information presented in this summary is drawn from the U.S. Department of Energy’s (DOE) Building Energy Codes Program and the Building Codes Assistance Project (BCAP). For more detailed information about building energy codes, visit the DOE and BCAP websites.

Prior to 2004 the primary energy conservation law in Illinois was the Illinois Public Utilities Act (revised in 1986.) This law required Illinois investor-owned electric utilities to use least-cost energy planning, which required the use of economical energy conservation when new resources for electricity were required. This requirement was implemented by utilities and monitored by the Illinois Commerce Commission through the least-cost energy planning process.

Public Act 093-0936 (Illinois Energy Conservation Code for Commercial Buildings) was signed into law in August, 2004. The Illinois Energy Conservation Code for Commercial Buildings became effective April 8, 2006. This law requires all commercial construction for which a building permit application is received by a municipality or county to follow a comprehensive statewide energy conservation code. The administrative rules for this change became effective October 9, 2007. No equivalent law covering residential building construction has yet been passed.

For more information on the Illinois Energy Conservation Code for Commercial Buildings, go to: