2021 International Energy Conservation Code (IECC) – ICC Paperback

The 2021 International Energy Conservation Code (IECC) is the International Code Council's paperback model energy code, setting minimum energy-efficiency requirements for the design and construction of new residential and commercial buildings.

The IECC is the energy code most U.S. states and cities adopt, either as published or with local amendments. The 2021 edition is split into residential provisions and commercial provisions, covering building envelope insulation and air leakage, fenestration, mechanical systems, service water heating, lighting and power, plus compliance paths such as prescriptive tables and performance modeling. The commercial chapters also recognize ASHRAE 90.1 as an alternative compliance route.

What's included

• 2021 International Energy Conservation Code, complete residential and commercial provisions
• Paperback, softcover binding
• Publisher: International Code Council (ICC)
• ISBN-13: 9781609839611
• Prescriptive, performance and energy-rating-index compliance paths

Who it's for

Building officials and plans examiners checking energy compliance, HVAC and insulation contractors, HERS raters and energy consultants, architects and mechanical engineers, and students sitting ICC certification exams that reference the 2021 IECC.

Why this edition

The 2021 cycle raised envelope and lighting requirements noticeably over 2018 and added an additional efficiency package requirement for residential construction. A 2024 IECC has since been published, but adoption moves slowly, and a large share of jurisdictions are still enforcing the 2021 edition. Check with your local building department to confirm which edition applies to your permit.

Frequently asked questions

Is the 2021 IECC still in use?

Yes. Many states and municipalities adopted the 2021 IECC and continue to enforce it, even though a 2024 edition exists. Confirm the adopted edition with your Authority Having Jurisdiction (AHJ).

Does this book cover both residential and commercial buildings?

Yes. The 2021 IECC includes the residential provisions (IECC-R) and the commercial provisions (IECC-C) in one volume.

Which ICC exams use the 2021 IECC?

ICC's residential and commercial energy inspector and plans examiner certifications are offered on the 2021 edition. Verify the current exam reference list before you order.

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