Building Energy Code (Illinois)

From Open Energy Information

Revision as of 20:36, 8 December 2009 by Incbot (talk | contribs)$7

Last modified on December 8, 2009.

Rules Regulations Policies Program

Place Illinois
Name Illinois Building Energy Codes
Incentive Type Building Energy Code
Applicable Sector Commercial, Residential
Active Incentive Yes

Code Change Cycle No schedule set.
Commercial Code 2009 IECC and 2007 ASHRAE 90.1 statewide. Can use COMcheck to show compliance.

Residential Code 2009 IECC (pending adoption of rules, modifications possible)

Date added to DSIRE 2006-07-27
Last DSIRE Review 2009-09-28

References DSIRE[1]

Incentive Contact

Contact Name Greg Lenaghan
Department Illinois Department of Commerce and Economic Opportunity
Division Bureau of Energy and Recycling
Address 620 East Adams Street
Place Springfield, Illinois
Zip/Postal Code 62704
Phone (217) 785-3983
Phone 2 (800) 785-6055
Contact Name Bruce Selway
Department Illinois Department of Commerce and Economic Opportunity
Address 620 East Adams
Place Springfield, Illinois
Zip/Postal Code 62701
Phone (217) 785-2023


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 Capital Development Board has the authority to create administrative rules, and its most recent rule amendments mandated that the code for commercial buildings follow 2009 International Energy Conservation Code (IECC) (as of August 2009). Municipalities and counties are required to enforce 2009 IECC.

Illinois legislature amended the building code again in August 2009; Public Act096-0778 (Illinois Energy Efficient Building Act) extended the building codes to residential buildings. The Capital Development Board is to adopt IECC 2009 for residential buildings as well, although the rules are under development and there may be modifications. The CDB rule making process should be complete by the end of 2009.

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

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


  1. DSIRE Database of State Incentives for Renewables & Efficiency accessed 2009-12-08