New Jersey enforces the 2024 IECC residential

Record of adoption

In force since

Aug 17, 2026

Legal citation

N.J.A.C. 5:23-3.18

Adopted by

NJ Department of Community Affairs (Commissioner), with Code Advisory Board

Second reading

Agreed Oct 19, 2026

Applies

Statewide

Also called

N.J.A.C. 5:23-3.18

Replaced the 2021 IECC. NJ amendments apply and optional appendices (RD through RL) are provided.

Exceptions

• Six-month grace period for permit applications under the prior (2021) edition; a secondary source gives Feb 17, 2027, as the end
• ASHRAE 90.1-2022 applies to other residential (per DCA table), not the IECC

How New Jersey adopts the IECC residential

• Agency rule

The Commissioner amends the Energy Subcode (N.J.A.C. 5:23-3.18) by rule after Code Advisory Board review, with a Register proposal, comment period and adoption. The residential energy edition moved with the 2024 model-code package. No legislative approval step was found.

Cycle. Roughly every three to four years following the ICC cycle; the commercial side is tied to federal DOE determinations

Laws, rulings, and other actions

1. Jun 28, 1996Legislation
   P.L. 1996, c.53 (Assembly Committee Substitute for A1708 and A1782)

   Amended the Uniform Construction Code Act (N.J.S.A. 52:27D-123) so subcodes may be adopted individually and adoption of new model-code publications cannot occur more often than once every three years except in imminent peril.

   Enacted Jun 28, 1996, effective first day of third month after enactment

   pub.njleg.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 19, 2026.

The state’s record was last read on Oct 19, 2026, from six source pages.

Evidence 8 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.

• “Effective Date: August 17, 2026.”

• “the 2024 International Building Code”

  “the 2024 edition of the International Residential Code”

  “2023 National Electrical Code (NEC)”

• “the 2024 editions of the IBC, IRC, IECC, IMC, IFGC, NSPC, and the 2023 edition of the NEC”

• “5:23-3.18”

  “Aug 17, 2026”

• “2021 2020 2021 2019 2021 2021 2021 2021 2017 09-06-22”

  “2024 2023 2024 2022 2024 2024 2024 2024 2024 08-17-26”

• About another code

  “during the six-month grace period following adoption of the model codes”

• About another code

  “six-month grace period for the previous model codes”

• About another code

Tracker cross-checks

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

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

  Current State Code: 2024 IECC; State Amendments: Yes; Effective Date: 08/17/2026; Enforcement: Mandatory Statewide

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

• BCAP’s code status pageCross-checkDoes not agree with the record

  Residential based on 2021 IECC, effective 7/1/2024 (page metadata Apr 7, 2025)

  bcapcodes.org (opens in a new tab)Read Oct 17, 2026

Related pages

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

Other codes in New Jersey

• NEC2023 NECVerified
• IBC2024 IBCVerified
• IRC2024 IRCVerified
• IFC2018 IFCPartial
• IECC commercialAnother model codePartial