Emergent Team·June 6, 2026·6 min read

The United States is a patchwork of energy code adoption. Some states enforce the 2024 IECC with its 10,000 square foot monitoring threshold. Others are still on the 2021 IECC at 25,000 square feet. Some use ASHRAE 90.1 as their commercial energy standard instead of the IECC. And several states allow local jurisdictions to adopt codes independently, creating city-level variation within states that have no statewide commercial energy code. This guide maps the current adoption status of every state and major city, identifies the specific metering trigger for each jurisdiction, and explains what building owners and engineers need to know.

Tier 1: States with 2024 IECC or Equivalent (10,000 Sq Ft Threshold)

These jurisdictions have adopted the 2024 IECC or a code based on it, triggering the 10,000 square foot metering threshold:

• Rhode Island: First Northeast state with 2024 IECC in effect, December 1, 2025. Includes EV-ready and electric-ready appendices.
• Delaware: Adopted code based on 2024 IECC including EV charging and solar-ready provisions.
• Colorado (after July 2026): Any jurisdiction updating its building code after July 1, 2026 must adopt the Low Energy and Carbon Code based on the 2024 IECC.

Tier 2: States with 2021 IECC or ASHRAE 90.1-2019 (25,000 Sq Ft Threshold)

These jurisdictions have adopted the 2021 IECC or ASHRAE 90.1-2019, triggering the 25,000 square foot metering threshold:

• Connecticut: Full 2021 IECC adopted October 2022, no weakening amendments. Fast-track adoption mechanism targets 2024 IECC by late 2026.
• New Jersey: ASHRAE 90.1-2019 adopted without amendments, September 2022.
• Virginia: 2021 IECC and ASHRAE 90.1-2019 effective January 2024.
• Massachusetts: 2021 IECC base code plus Stretch Code (mandatory for 300+ Green Communities) and Specialized Code.
• Vermont: 2021 IECC-based with Package Plus Points compliance system.
• Maine: 2021 IECC as base code; developing stretch code.
• Hawaii: Full 2021 IECC adopted.
• Louisiana: Full 2021 IECC adopted.
• Utah: 2021 IECC adopted with amendments.
• Florida: 8th Edition Florida Building Code based on 2021 IECC.
• Pennsylvania: 2021 IECC adopted with amendments.
• Colorado (before July 2026): 2021 IECC as minimum for jurisdictions updating codes between July 2023 and June 2026.

Tier 3: Major Cities with Local Adoption

These cities have adopted local energy codes based on the 2021 IECC or more stringent standards, even though their states may not have statewide commercial energy codes:

• Texas Cities: Austin, Dallas, Houston, San Antonio, El Paso, and Killeen have adopted local codes based on the 2021 IECC. Texas has no statewide mandatory commercial energy code.
• New York City: NYC Energy Conservation Code plus Local Laws 88, 97, and 84 creating the most comprehensive metering and benchmarking regime in the country.
• Philadelphia, PA: Local Building Performance Standards in addition to Pennsylvania's state code.
• Washington, DC: BEPS program with first compliance cycle ending 2026. Maximum penalty exposure of $10 per square foot.

Tier 4: States Actively Reviewing 2024 IECC

These jurisdictions are in the adoption pipeline for the 2024 IECC and will likely trigger the 10,000 square foot threshold within 12–24 months:

• Maryland, New York, DC, Massachusetts, New Jersey, Connecticut, Maine: All in active review or adoption process for the 2024 IECC.

Federal Floor

HUD and USDA's April 2024 Final Determination adopted the 2021 IECC and ASHRAE 90.1-2019 as minimum requirements for all federally financed housing programs, with the 2024 IECC and ASHRAE 90.1-2022 accepted as alternative compliance paths. Any project receiving FHA, USDA Rural Development, or HUD-assisted financing must meet these metering standards regardless of the state's adopted code. Federal agencies are required to use the most current standard for new construction under EISA Section 543 and Executive Order 14057.

What This Means for Building Owners and Engineers

If you are designing or constructing a commercial building in any Tier 1, 2, or 3 jurisdiction, energy monitoring is a code requirement today. If you are in a Tier 4 jurisdiction, it will be a requirement within 1–2 years. And if your project involves federal financing, it is a requirement regardless of state or local code status. The practical advice is the same across all tiers: design monitoring into the project from the beginning, use the 2024 IECC's 10,000 square foot threshold as your design standard even if your jurisdiction currently enforces the 2021 edition's 25,000 square foot threshold, and choose a monitoring platform that can scale as requirements expand.

Not sure what metering requirements apply to your project's jurisdiction? Contact Emergent Metering at 215-645-7141 or email sales@emergentmetering.com with your project location and building size. We'll identify the applicable code, list the specific metering requirements, and provide a sensor specification with transparent pricing.

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