Herriman, Utah has adopted: 2021 International Residential Code (IRC), including amendments to the 2021 Residential Energy Code and Appendix AE & AQ — Herriman City Building Codes and Design Criteria (herriman.gov/building-codes-design-criteria, live-checked 2026-07-16); REMAINS CURRENT, Utah Code § 15A-2-103(1)(b) did NOT change this edition in the 7/1/2026 amendment. CORRECTION (2026-07-16): a prior version of this entry read 'Appendix E & Q' — the city's page actually reads 'Appendix AE & AQ,' which correctly maps to Appendix AQ (§ 15A-2-103(1)(c)) and, subject to § 15A-2-104(1), Appendix AE (§ 15A-2-103(1)(k)); corrected to match the source verbatim.; Residential provisions of the 2024 International Swimming Pool & Spa Code (ISPSC) — CURRENT statewide as of 7/1/2026 per Utah Code § 15A-2-103(1)(n), superseding the 2021 ISPSC. Herriman's Building Codes and Design Criteria page still lists 'Residential provisions of the 2021 International Swimming Pool & Spa Code (ISPSC)' verbatim — live-checked 2026-07-16, confirming this one item lags. The statute controls.; 2024 International Energy Conservation Code (IECC), single unsplit statewide edition — CURRENT as of 7/1/2026 per Utah Code § 15A-2-103(1)(h) (no residential/commercial split under current law). Herriman's own page (live-checked 2026-07-16) already lists '2024 Commercial IECC' for the commercial side, but for residential energy it instead cites 'Amendments to the 2021 Residential Energy Code' rather than the unified 2024 IECC — that residential-specific citation is superseded by the single 2024 IECC under current law; preserved as history in the HISTORY entry below.; HISTORY (superseded 7/1/2026, but still shown on Herriman's own page as of live-check 2026-07-16): 'Amendments to the 2021 Residential Energy Code' — Herriman City Building Codes and Design Criteria; no longer has independent authority for residential energy provisions now that Utah Code § 15A-2-103(1)(h) applies a single unsplit 2024 IECC to both residential and commercial construction statewide.; 2023 National Electrical Code (NEC) — Herriman City Building Codes and Design Criteria (live-checked 2026-07-16, unchanged); also Utah Code § 15A-2-103(1)(g); REMAINS CURRENT, UNCHANGED by the 7/1/2026 amendment; 2024 International Building Code (IBC), including Appendix C & J — Herriman City Building Codes and Design Criteria, live-checked 2026-07-16: the city's own page is ALREADY CURRENT, verbatim listing '2024 International Building Code (IBC), including Appendix C & J,' matching Utah Code § 15A-2-103(1)(a) effective 7/1/2026. This file's prior codesAdopted entry (2021 IBC) was the stale one.; 2024 International Plumbing Code (IPC) — Herriman City Building Codes and Design Criteria, live-checked 2026-07-16: the city's own page is ALREADY CURRENT, matching Utah Code § 15A-2-103(1)(d). This file's prior codesAdopted entry (2021 IPC) was the stale one.; 2024 International Mechanical Code (IMC) — Herriman City Building Codes and Design Criteria, live-checked 2026-07-16: the city's own page is ALREADY CURRENT, matching Utah Code § 15A-2-103(1)(e). This file's prior codesAdopted entry (2021 IMC) was the stale one.; 2024 International Fuel Gas Code (IFGC) — Herriman City Building Codes and Design Criteria, live-checked 2026-07-16: the city's own page is ALREADY CURRENT, matching Utah Code § 15A-2-103(1)(f). This file's prior codesAdopted entry (2021 IFGC) was the stale one.; 2024 International Fire Code (IFC) — Herriman City Building Codes and Design Criteria, live-checked 2026-07-16 (the city's own page now reads '2024 International Fire Code (IFC),' up from the 2021 edition in this file's prior entry). NOTE: the IFC is NOT among the codes adopted by Utah Code § 15A-2-103 (Title 15A Chapter 2, State Construction Code) — Utah's Fire Code is separately adopted under Title 15A Chapter 5, State Fire Code Act; the city's own edition choice is left as published, no statutory edition change applies via § 15A-2-103.; Commercial provisions of the 2024 International Energy Conservation Code — Herriman City Building Codes and Design Criteria, live-checked 2026-07-16 (already updated from the 2021 edition in this file's prior entry); collapses into the single unsplit 2024 IECC entry above per Utah Code § 15A-2-103(1)(h), which no longer distinguishes residential/commercial editions.; 2024 International Existing Building Code (subject to HUD & IRC Appendix E) — Herriman City Building Codes and Design Criteria, live-checked 2026-07-16: the city's own page is ALREADY CURRENT, matching Utah Code § 15A-2-103(1)(i). This file's prior codesAdopted entry (2021 IEBC) was the stale one.; Modular Building Institute (MBI) Standards 1200 and 1205 — statewide per Utah Code § 15A-2-103(1)(o); not listed on Herriman's own Building Codes and Design Criteria page (live-checked 2026-07-16), added here per statute.; ICC/ANSI A117.1-2009 and A117.1-2017 — Herriman City Building Codes and Design Criteria; Applicable Utah State Amendments — Utah Code Title 15A; NOTE (2026-07-16 re-verification): Utah Code § 15A-2-103, version effective 7/1/2026 (superseded 1/1/2027), took effect 15 days before this re-verification. IBC/IPC/IMC/IFGC/IECC/IEBC/residential ISPSC are now 2024 statewide; IRC (2021) and NEC (2023) did NOT change. Herriman's Building Codes and Design Criteria page (herriman.gov/building-codes-design-criteria) was live-checked 2026-07-16 via real-browser navigation. UNLIKE most sibling cities checked in this pass, Herriman's page is ALREADY CURRENT for IBC/IPC/IMC/IFGC/IEBC/commercial-IECC (all show 2024) — this file's PRIOR codesAdopted data (2021 for all of these) was the stale one, not the city. The only genuine city-side lag found: the ISPSC residential-provisions citation still reads 2021 (should be 2024), and the residential-energy citation still points to 'Amendments to the 2021 Residential Energy Code' rather than the unified 2024 IECC that now governs both residential and commercial per § 15A-2-103(1)(h). IRC and NEC editions are correct on both the statute and the city's page.. Local amendments apply — see the Herriman overview page for the full list.