Overview of the 2009 IECC

The 2009 IECC represents a significant energy savings over the previous 2006 version. When the code was released, the Energy Efficient Codes Coalition released a study estimating that on average buildings built to this version of the code would save 12-15% of energy (heating, cooling, lighting and water heating) as compared to the 2006 code. The U.S. Department of Energy (DOE) agreed in its determination on the 2009 IECC that it would provide substantial energy savings. Besides general improvements to the building envelope, one significant change was that equipment tradeoffs, whereby the building shell performance could be reduced through greater heating and air conditioning efficiency, were eliminated. It represents the first major energy savings in an IECC edition, and is currently the most commonly adopted code version.

The full text of the 2009 IECC is available from the ICC website as just the code or the code plus commentary. It is also available packaged with various other building codes.

To view the core energy efficiency provisions of the prescriptive path of the 2009 IECC, click the appropriate building type below.

Commercial
Commercial

Residential
Residential