Pennsylvania enforces the 2020 NEC, with exceptions

Record of adoption

In force since

Jan 1, 2026

Legal citation

34 Pa. Code Sec. 403.21 (adopts the 2021 IBC, which references NFPA 70), Regulation #12-125

Adopted by

Pennsylvania Department of Labor & Industry, through its UCC adoption of the 2021 IBC and IRC

Applies

Statewide, with exceptions

Also called

NEC, NFPA 70-2020, 2020 NEC

NFPA 70-2020 is inferred from the 2021 IBC reference and is cited by Philadelphia and a township memo; no state page was found naming the NEC edition.

Exceptions

• Philadelphia lists 2020 NFPA 70 as a referenced standard under its own Title 4 code
• No stand-alone statewide NEC adoption rule was found; a township memo says the NEC applies as referenced in the 2021 IBC

How Pennsylvania adopts the NEC

• Agency rule
• The legislature sets the update schedule
• A recent law changed the process

No separate NEC adoption step was found: a township memo says the NEC applies as referenced in the 2021 IBC, so it would change only when a Council-reviewed triennial update takes effect. That process is the Construction Code Act’s: Council review starts 21 months after ICC publication, a two-thirds majority of members is needed to adopt or modify contested sections, and L&I promulgates final-omitted regulations without change within nine months of the report, effective 33 months after review began. No bill or legislative vote is part of it.

Cycle. Triennial by design (Council review starts 21 months after each ICC edition and rules take effect 33 months after review begins), but adoption has been irregular: 2015 I-Codes effective Oct 1, 2018, 2018 I-Codes effective Feb 14, 2022 (per L&I’s home page), 2021 I-Codes effective Jan 1, 2026.

Laws, rulings, and other actions

1. Nov 8, 2025Other action
   Regulation #12-125: UCC triennial update adopting the 2021 I-Codes (final-omitted)

   Adopts nearly all provisions of the 2021 ICC codes with Pennsylvania modifications, effective Jan 1, 2026, after IRRC approval on Oct 16, 2025.

2. Oct 20, 2025Other action
   Philadelphia L&I Code Bulletin B-2501: implementation of the 2021 International Codes

   Philadelphia moves its Title 4 construction code to the 2021 I-Codes from Jan 1, 2026, requires them for applications received on or after Jul 1, 2026, and keeps its Administrative Code as a local construction code.

3. Oct 25, 2017Legislation
   Act 36 of 2017 (P.L. 356, No. 36)

   Added Section 108 with the current Council schedule and two-thirds vote rule, amended Sections 107 and 304, required a re-review of the 2015 I-Codes, and let first-class cities adopt provisions of the 2018 ICC codes.

   Enacted Oct 25, 2017

   legis.state.pa.us (opens in a new tab)
4. Apr 25, 2011Legislation
   Act 1 of 2011HB 377, 2011 regular session

   Set a two-thirds Council vote for revisions sent to the Secretary, required public hearings and L&I adoption of the revisions without change, and added Section 901 subsections on log walls, one- and two-family sprinklers, floor fire protection and wall bracing.

   Enacted Apr 25, 2011, effective on enactment except the Section 107(c)(2) change effective Jul 1, 2012

   legis.state.pa.us (opens in a new tab)
5. Nov 10, 1999Legislation
   Act 45 of 1999 (P.L. 491, No. 45), Pennsylvania Construction Code Act

   Created the statewide Uniform Construction Code, adopted by L&I regulation, and the Review and Advisory Council; its Sections 107, 108 and 304 now set the update process.

   Enacted Nov 10, 1999

   legis.state.pa.us (opens in a new tab)

How it was checked

Partial

Researched in the state’s own record. The seal stays broken until the passage is on file word for word.

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

Evidence 6 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 effective date is January 1, 2026.”

• “The effective date is January 1, 2026.”

• “2020 NFPA 70 (National Electrical Code)”

• “The expected effective date of the final-form regulation: January 1, 2026”

Tracker cross-checks

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

• NFPA’s enforcement mapCross-checkAgrees with the record

  Pennsylvania 2020 (1/1/2026)

  Read Oct 18, 2026; NFPA page as of Aug 3, 2026.

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

Related pages

• See Pennsylvania’s NEC on the map
• NEC adoption in every state
• All six codes in Pennsylvania

Other codes in Pennsylvania

• IBC2021 IBCVerified
• IRC2021 IRCVerified
• IFC2021 IFCVerified
• IECC residential2021 IECCVerified
• IECC commercial2021 IECCVerified