2021 IECC (Base Codes)

Codes And Policy / Energy Codes

2021 IECC: Flexibility for the Future | 2021 IECC: Ready and Resilient | 2021 IECC: Commercial | 2021 IECC: Residential

The International Energy Conservation Code (IECC) is the most widely adopted energy code by local jurisdictions in the United States. It provides many benefits, among which is the model code development process that offers an international forum for energy professionals to discuss performance and prescriptive code requirements. This model code also encourages international consistency in the application of provisions. NBI is using its deep experience in stretch code development, advanced energy code implementation in states, as well as past success in the IECC development process to work for increased efficiency of commercial buildings in the 2021 IECC.  We are also working to advance residential energy efficiency through participation in the IECC Residential code development process by promoting innovative revisions that will increase efficiency and building quality.

Boosting the efficiency of building energy codes is essential to sound energy policy and to meeting Paris Accord and other carbon reduction targets. Buildings use over 40% of the energy used in the United States, including 70% of the electricity. Building energy use accounts for more than one-third of greenhouse gas emissions globally. Improvements to the new and existing building stock are critical to reducing energy use and meeting climate goals.

The IECC is updated every three years through a stakeholder approval process. While progress was made in efficiency gains in this code between 2006 and 2012, more recently efficiency improvements have stagnated due to political pressure from specific interest groups, leaving many jurisdictions unable to move forward with efficiency gains. The 2021 IECC is the best near-term opportunity to curb carbon impacts from new buildings across the United States.Path for Participation in the 2021 IECC Code Cycle

NBI has developed code proposals along with partners such as the Energy-Efficient Codes Coalition and ACEEE in order to offer improvements of 10-15% stringency in the commercial and residential standards to be adopted in fall of 2019. The proposals are available through the buttons below. In addition, we will be providing education and support for local jurisdictions that want to know more about the new proposals for the 2021 IECC.

Learn more in this factsheet and join us for a webinar on March 5, 2019. Contact Amy Cortese, Director of Programs, for additional information.


2021 IECC Proposals

Flexibility for the Future Ready & Resiliant Commercial Residential

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IECC Voting