What is an energy code? Energy codes are part of the building code that regulates how heat and energy are used in a building. By now, most builders understand there are minimum insulation levels, in walls, floors and ceilings. There are also requirements in how windows and doors perform. Air tightness testing and mechanical system performance (both in space heating and water heating) are also part of the energy codes. Local jurisdictions adopt (sometimes modify) and enforce these codes. Updated energy codes are released every three years. The 2024 IECC has been released, but most jurisdictions are looking to adopt the 2021 version, which you can read here: 2021 INTERNATIONAL ENERGY CONSERVATION CODE (IECC) | ICC DIGITAL CODES (iccsafe.org)
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