New York enforces the 2024 IECC residential, with exceptions

Record of adoption

In force since

Dec 31, 2025

Legal citation

19 NYCRR Part 1240; Energy Law Article 11 (11-103)

Adopted by

State Fire Prevention and Building Code Council (NYS Department of State); local governments administer and enforce

Second reading

Agreed Oct 18, 2026

Applies

Statewide, with exceptions

State amendments

Major

Also called

2025 ECCCNYS, ECCCNYS, State Energy Conservation Construction Code, Energy Code, 19 NYCRR Part 1240

A modified 2024 IECC; the fossil-fuel prohibitions at 19 NYCRR 1240.6 and Subpart 1229-2 are suspended by court order and not in force (see next).

Exceptions

• New York City has its own approved Energy Conservation Code: the 2025 NYC Energy Conservation Code, comprised of the 2025 ECCCNYS with NYC amendments (Local Law 47 of 2026)
• Local governments can obtain Code Council approval of more restrictive local energy standards (Energy Law 11-109, as cited on the Code Council page)

Coming next

• Change to the 2024 IECCPartial
  Adopted; start date not setAdopted, not yet in forceEnergy Law 11-104(6)-(7); 19 NYCRR 1240.6; 19 NYCRR Subpart 1229-2

  Adopted with the 2025 rules but suspended by court order (stipulation filed Nov 12, 2025, in Mulhern Gas Co. v. Mosley); DOS said on Jul 2, 2026, it remains suspended. Statutory dates are Dec 31, 2025 (new buildings up to seven stories, except commercial or industrial buildings over 100,000 sq ft) and after Dec 31, 2028 (all other new buildings).

How New York adopts the IECC residential

• More than one path
• A recent law changed the process

The Code Council adopts the State Energy Conservation Construction Code (19 NYCRR Part 1240) by rule under Energy Law Article 11, from time to time as it deems appropriate. Energy Law 11-103(2) requires the code to meet or exceed the then most recently published IECC (residential) and ASHRAE 90.1 (commercial) and, since a 2022 amendment, to use best efforts to exceed their savings; Energy Law 11-104(6)-(7), in a section amended by Part RR of Chapter 56 of the Laws of 2023, requires the code to prohibit fossil-fuel equipment in new buildings on fixed dates, but the implementing rules are suspended by court order. The 2025 energy rule followed the Uniform Code timeline: adopted Jul 25, 2025, amended Dec 5, 2025, effective Dec 31, 2025.

Cycle. Irregular; no statutory schedule, though the code must meet or exceed the latest IECC or ASHRAE 90.1 published when it is adopted. Previous update effective May 12, 2020, current Dec 31, 2025.

Laws, rulings, and other actions

1. Jun 30, 2026Court ruling
   Second Circuit decision that the State all-electric law and NYC Local Law 154 are not preempted by EPCA (Ass’n of Contracting Plumbers of the City of New York v. City of New York, 180 F.4th 434; DOS links a Mulhern Gas v. Mosley decision)

   Removes the legal obstacle behind the stay; DOS said on Jul 2, 2026, the provisions stay suspended pending updates, and a law-firm article reports the stay ends Oct 28, 2026, unless the plaintiffs seek Supreme Court review.

2. Dec 31, 2025Legislation
   Part RR of Chapter 56 of the Laws of 2023 (All-Electric Buildings Act; Energy Law 11-104(6)-(7))

   Requires the Code Council to make the energy code and Uniform Code prohibit fossil-fuel equipment and building systems in new buildings up to seven stories (except commercial or industrial buildings over 100,000 sq ft) from Dec 31, 2025, and in all other new buildings after Dec 31, 2028, with exemptions.

   Enacted 2023; statutory prohibition dates Dec 31, 2025, and Dec 31, 2028; implementing rules suspended by court order since Nov 12, 2025, still suspended per DOS on Jul 2, 2026; no later statute changing the dates was found

   dos.ny.gov (opens in a new tab)
3. Dec 5, 2025Other action
   Code Council amended rule (Amended Notice of Adoption) for the 2025 Uniform Code and Energy Code

   Amended the 2025 code books and rules (for example dropping the model-code ASHRAE 90.1 from the referenced standards); effective Dec 31, 2025, with no transition period, State Register notice Dec 24, 2025.

4. Nov 12, 2025Court ruling
   Mulhern Gas Co. v. Mosley (N.D.N.Y. No. 1:23-cv-01267): stipulation and court order suspending the State all-electric implementing rules

   Suspends the effective date and enforcement of 19 NYCRR 1240.6 and Subpart 1229-2 (fossil-fuel prohibitions) until the Second Circuit rules on the appeal.

5. UndatedLegislation
   Energy Law 11-103(2)(b), added by a 2022 chapter of the Laws of New York

   Directs the Code Council, when adopting the first amended energy code after the amendment and later codes, to use best efforts to exceed the savings of the then latest IECC (residential) and ASHRAE 90.1 (commercial), at levels recommended by NYSERDA.

   Enacted 2022

   nysenate.gov (opens in a new tab)

How it was checked

Verified

Two separate readings of the state’s own record agree, and the passage is on file word for word.

Read twice: a second, blind reading of the state’s record agreed with the first on Oct 18, 2026.

The state’s record was last read on Oct 18, 2026, from eight source pages.

Evidence 12 sources

Sources for the record itself come first, the state’s own records ahead of others. A label marks a source about something else, such as an exception. A source marked secondary is not the state’s own record.

• “The state energy conservation construction code adopted by the state fire prevention and building code council”

  “is continued until amended or a new code is adopted and effective.”

• “a modified version of the 2024 International Energy Conservation Code (IECC)”

  “The proposed rule is based on ASHRAE 90.1-2022”

• “the 2024 NYS ASHRAE 90.1 is based on ASHRAE 90.1-2022”

  “based upon the most recent (2024) edition of the IECC”

• “based on the 2024 International Code Council (ICC) books with New York State specific amendments included.”

• “The effective date of the modifications to Part 1240 is December 31, 2025.”

• “The effective date of the 2025 NYS Code Books, and the amendments to the 2025 NYS Code Books”

  “made by this amended rule, will be December 31, 2025.”

• “The rule adopted by the Code Council on July 25, 2025 repealed the 2020 edition of the Energy Code”

  “and adopted an amended and updated edition of the Energy Code.”

• “2025 Energy Conservation Construction Code of New York State (publication date: July 2025)”

  “NYS ASHRAE 90.1-2025 – NYS version of the Energy Standard for Buildings Except Low-Rise Residential Buildings”

• About an exception

  “is comprised of the publication entitled the 2025 Energy Conservation Construction Code of New York State”

• About an exception

  “conforming the New York city energy conservation code to the New York state energy code with amendments unique to construction in the city”

• About an exception

  “New York City is allowed to adopt separate building codes than the rest of the state.”

  “New York City has an approved local energy code.”

• About an exception

Tracker cross-checks

Code adoption trackers are a cross-check. They are not New York’s own record.

• DOE’s energycodes.govCross-checkAgrees with the record

  Residential: current state code 2024 IECC, state amendments yes, effective 12/31/2025, mandatory statewide.

  energycodes.gov (opens in a new tab)Read Oct 17, 2026

Related pages

• See New York’s IECC residential on the map
• IECC residential adoption in every state
• All six codes in New York

Other codes in New York

• NEC2023 NECPartial
• IBC2024 IBCVerified
• IRC2024 IRCVerified
• IFC2024 IFCVerified
• IECC commercial2024 IECCVerified