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Energy Conservation Code

The New York City Energy Conservation Code (NYCECC) is comprised of New York City local laws and the current Energy Conservation Construction Code of New York State (ECCCNYS). By State law, all local government Energy Codes, including the NYCECC, must be more stringent than the ECCCNYS.

2025 NYC Energy Conservation Code

Enforcement of the 2025 New York City Energy Conservation Code (2025 NYCECC) and 2025 NYC ASHRAE 90.1 will begin March 30, 2026.

Adopted as Local Law 47 of 2026 (Intro 1490-2025-B), the 2025 NYCECC and the 2025 NYC ASHRAE 90.1 are based on the 2025 Energy Conservation Construction Code of New York State (2025 ECCCNYS) and the 2025 New York State Energy Standard for Buildings Except Low-Rise Residential Buildings (2025 NYS ASHRAE 90.1).

The 2025 ECCCNYS is based on the 2024 International Energy Conservation Code (2024 IECC), and the 2025 NYS ASHRAE 90.1 is based on ASHRAE 90.1-2022.

2025 NYCECC and 2025 NYC ASHRAE 90.1 notable highlights:

  • New Additional Efficiency Credits chapters
  • Expanded requirements for existing buildings
  • Historic buildings no longer auto-exempt
  • New documentation + testing requirements
  • NYC overlays → Committee recommendations + legacy provisions integrated

Application Submittal

  • Applications filed on or after March 30th, 2026, will be subject to the 2025 NYCECC. Complete applications filed on or before March 29th, 2026, will be subject to the 2020 NYCECC.
    NOTE: Complete applications are those that meet the submittal requirements of a forthcoming buildings bulletin and include a complete energy analysis.
  • Incomplete applications filed before March 30th, 2026, may be subject to the 2025 NYCECC.

Local Law 47 of 2026 (Intro 1490-2025-B) may be found on the New York City Council’s website. A published hard copy will be available at the City Store and ICC website, and is also viewable on this webpage.

Applicability

The 2025 NYCECC applies to completed job applications filed on or after March 30th, 2026. All completed job applications filed on or before March 29th, 2026 can continue review under the 2020 NYCECC.

NOTE: Please see Service Notice (December 2025)

NOTE: Please see What Codes, Rules, & Forms Apply When and Frequently Asked Questions for more information.

Application Types Not Regulated by the Energy Code

Full demolition, sign, emergency generator, and subdivision applications are not required to comply with the NYCECC. However, sign applications that affect a building’s envelope must be accompanied by an alteration application for the envelope work, which must comply with the NYCECC.

Variances

Under Article 11 of the New York State Energy Law, only the Secretary of State has the authority to grant variances from the provisions of the NYCECC that align with the State Energy Code. Contact the Department of State’s Division of Building Standards and Codes for an application for variance by email at energy.code.support@dos.ny.gov. The application form is also available on the Department of State’s website. For variances or waivers from provisions of the Energy Code that are more stringent than the State Energy Code, please follow the process outlined on the Determination Requests webpage to submit a Construction Codes Determination (CCD1) request to the Department.

Software for Energy Analysis

REScheck, COMcheck, and DOE2-based software can be used to conduct the energy analysis and are available for free at the US Department of Energy and may be used as follows:

  • REScheck: The full report shall be provided, including the building envelope, HVAC/service water heating. The 2025 New York City version must be used. The IECC version of REScheck is not acceptable
  • COMcheck: Depending on whether you use the 2025 NYCECC or 2025 NYC ASHRAE 90.1 (modified 2025 NYS ASHRAE 90.1) for compliance, the respective version of COMcheck should be used. Use the 2025 NYCECC version for ECC compliance and the 2025 NYC ASHRAE 90.1 version for compliance with that standard.

CURRENT Regulations

Superseded Regulations

  • 1 RCNY §5000-01 – Energy Code Compliance Rule, Including Progress Inspections – Aligned to the 2016 NYCECC
  • 1 RCNY §5000-01 – Energy Code Compliance Rule, Including Progress Inspections – Aligned to the 2014 NYCECC
  • 1 RCNY §5000-02 – Corrections and Amendments to ASHRAE 90.1-2013 – Aligned to the 2016 NYCECC
    [Red line version]
  • 1 RCNY §101-07(c)(3) – Approved Agencies Rule – Progress Inspectors – Aligned to the 2016 NYCECC and the prior NYCECC

2020 NYCECC

  • 2020-007 – Envelope Buildings Bulletin
  • 2020-008 – Lighting/Power Buildings Bulletin
  • 2020-009 – HVAC/Service Hot Water Buildings Bulletin

2016 NYCECC

  • 2017-004 – Lighting/Power Buildings Bulletin
  • 2017-005 – HVAC/Service Hot Water Buildings Bulletin
  • 2017-006 – Envelope Buildings Bulletin

Reference Guides

2025 NYCECC

2020 NYCECC

Reference Tools

Additional Information

Helpful Links