What USA IECC 2021 - International Energy Conservation Code for Commercial and Residential Buildings requires
The International Energy Conservation Code (IECC) 2021, published by the International Code Council (ICC), establishes minimum energy efficiency requirements for residential (IRC Chapter 11 equivalent) and commercial buildings in the United States. IECC 2021 is adopted (with state and local amendments) as the baseline energy code by most US states and serves as the reference document for federal energy efficiency programs including DOE's Building Energy Codes Program. IECC 2021 contains two compliance paths: prescriptive and performance (energy modeling). The 2021 edition introduced significant updates including: Enhanced Inspection Program (EIP) option, EV-ready requirements, solar-ready zone requirements for residential, and increased insulation requirements over 2018 IECC. Commercial buildings must comply with ANSI/ASHRAE/IES Standard 90.1-2019 (referenced by IECC 2021 for commercial). States establish their own energy code adoption timelines; federal funding (IRA Section 50131) incentivizes states to adopt 2021 IECC or equivalent standard.
Pillar: Construction & Real Estate · Authority: International Code Council (ICC) and U.S. Department of Energy (DOE) - Building Energy Codes Program · Version: 1.0.0 · Last updated:
Primary source: https://www.energycodes.gov/
SHA-256 integrity: 23052654682e5839868120448db7c84846ae124ce658c2e506b171ff432377cb
Primary Citations — 7 traced to source
- {"instrument":"International Energy Conservation Code (IECC) 2021 - Residential and Commercial Provisions","section":"Chapter R4 - Residential Energy Efficiency; Chapter C4 - Commercial Energy Efficiency; Sections R402 (envelope), R403 (mechanical), R404 (electrical power and lighting), R405 (performance compliance), R407 (solar ready), R408 (EV ready)","url":"https://www.energycodes.gov/development/residential/iecc"}
- {"instrument":"ANSI/ASHRAE/IES Standard 90.1-2019 - Energy Standard for Sites and Buildings","section":"Section 5 - Building Envelope; Section 6 - HVAC; Section 9 - Lighting; Appendix G - Performance Rating Method for energy simulation compliance","url":"https://www.ashrae.org/technical-resources/bookstore/standard-90-1"}
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