The Energy Efficient Building Act 20 ILCS 3125

On January 29, 2010, the new state law known as The Energy Efficient Building Act 20 ILCS 3125 came into effect. This new law now includes all new residential buildings, additions, alterations, renovations and repairs; previously it only pertained to commercial projects. These projects must now meet all of the code requirements in the 2018 International Energy Conservation Code.

Exterior Energy Inspections are performed prior to any siding or masonry work to verify air sealing with all penetrations sealed.

Interior Energy Inspection are required to verify R-Values, duct work insulation if required, duct sealing, duct tightness test if any duct work is located outside the conditioned space, and R-Value of insulation for floors over unconditioned spaces.

Illinois Energy Conservation Code For Commercial And Residential Buildings

Please visit the Illinois Department of Commerce and Economic Opportunity for more information.

Why are there Building Energy Codes?

The Department of Energy provides a very detailed explanation on the importance of Energy Codes in the United States. From their website: Buildings use 39% of our total energy, two-thirds of our electricity, and one-eighth of our water. Of our total energy usage, transportation uses only 34%, and industry uses only 27%. In light of these fundamental environmental issues, the increasing cost of energy, and our current economic challenges, building energy efficiency is a key component of sound public policy.

For more information, please visit Energy Codes web site.

Helpful Handouts

The following handouts have been approved by the Building Official and may assist with the plan submittal requirements for some projects:

• IECC Prescriptive Method
• IECC REScheck