| IBC — International Building Code | 2024 IBC | Iowa Admin. Code r. 481—301.3(103A) (Part 1, Building Code), under Iowa Code s. 103A.8A; scope rule r. 481—301.1(103A); statutory applicability Iowa Code ss. 103A.10 and 103A.12. Adopted and chapter recodified from Iowa Admin. Code 661—ch. 301 to 481—ch. 301 by ARC 9474C, IAB 8/6/25, effective 9/10/25; editorial change IAC Supplement 11/26/25 · source ↗ |
| IEBC — International Existing Building Code | 2024 IEBC — the International Existing Building Code, 2024 edition, published by the International Code Council, adopted by reference WITH A LARGE ADMINISTRATIVE CHAPTER DELETED. ADOPTING WORDS VERBATIM, Iowa Admin. Code r. 481—301.7(103A): "The provisions of the International Existing Building Code, 2024 edition, published by the International Code Council, located at www.iccsafe.org, are hereby adopted by reference as the requirements for repair, alteration, change of occupancy, addition, and relocation of existing buildings, with the following amendments:"
*** IOWA IS GENUINELY A 2024 IEBC STATE AND THIS IS NOT THE RESULT OF ASSUMING THE NEWEST EDITION: the rule names 2024 and the same instrument (ARC 9474C) carries the 2024 IBC at r. 481—301.3 and the 2024 IRC at r. 481—301.8, all effective 2025-09-10. BUT DO NOT GENERALISE THE YEAR ACROSS IOWA: THE ENERGY CODE IN THE SAME CHAPTER IS STILL THE 2012 IECC (verified row 4be86b25, eff. 2014-03-12) AND THE NEC IS 2023 UNDER A DIFFERENT BOARD ENTIRELY.
*** WHERE THE IEBC SITS: Iowa Admin. Code 481 ch. 301 Part 1 runs 301.1 Scope and applicability · 301.2 Definitions · 301.3 General provisions (IBC) · 301.4 Mechanical requirements · 301.5 Electrical requirements · 301.6 Plumbing requirements · **301.7 Existing buildings (IEBC)** · 301.8 Residential construction requirements (IRC) · 301.9 Fuel gas piping requirements · 301.10 Transition period. ONE RULE PER CODE TYPE INSIDE ONE CHAPTER, WHICH IS WHY A CHAPTER-LEVEL source_url IS NOT A CITATION IN IOWA. | Iowa Admin. Code r. 481—301.7(103A) (Existing buildings), ch. 481—301 Part 1 (State Building Code), under Iowa Code chapter 103A / s. 103A.8A; State Building Code Bureau, Department of Inspections, Appeals and Licensing. Adopted and chapter recodified from Iowa Admin. Code 661—ch. 301 to 481—ch. 301 by ARC 9474C, IAB 8/6/25, effective 9/10/25. · source ↗ |
| IECC — International Energy Conservation Code | 2012 IECC — Residential Provisions (Iowa Admin. Code r. 481—301.24) and Commercial Provisions (r. 481—301.25). NOT the 2024 IECC. Iowa moved its IBC, IRC and IEBC to the 2024 editions effective 2025-09-10 but LEFT THE ENERGY CODE ON THE 2012 IECC, where it has sat since 2014-03-12 — four full I-Code cycles behind the rest of the Iowa State Building Code. | Iowa Admin. Code r. 481—301.23(103A), 481—301.24(103A) and 481—301.25(103A) (Part 3 of ch. 301), under Iowa Code s. 103A.8A; 2012 edition adopted by ARC 1301C, IAB 2/5/14, effective 3/12/14; recodified from Iowa Admin. Code 661—ch. 303 to 481—ch. 301 Part 3 by ARC 9474C, IAB 8/6/25, effective 9/10/25 (editorial change IAC Supp. 11/26/25; r. 301.24 further amended by ARC 0412D, IAB 7/8/26, effective 8/12/26, edition unchanged) · source ↗ |
| IFC — | 2024 IFC | Iowa Admin. Code r. 481-280.8(10A) · source ↗ |
| IMC — International Mechanical Code | 2024 IMC — the International Mechanical Code, 2024 edition, published by the International Code Council, adopted by reference IN PART. ADOPTING WORDS VERBATIM, Iowa Admin. Code r. 481—426.2: "Sections 101 and 102 and Chapters 2 through 15 of the International Mechanical Code, 2024 edition, published by the International Code Council, www.iccsafe.org, are hereby adopted by reference."
*** THE ADOPTION IS PARTIAL AND THE OMISSION IS DELIBERATE: only SECTIONS 101 AND 102 of Chapter 1 come in. THE REST OF IMC CHAPTER 1 — the model administrative provisions (permits, fees, inspections, board of appeals, violations) — IS NOT ADOPTED. Iowa supplies its own administration instead, at r. 481—426.3 (new Section 102.12), r. 481—426.4 and r. 481—426.5. NO APPENDICES ARE ADOPTED; none is named. The rule specifies no excluded chapter within 2 through 15.
IOWA IS GENUINELY A 2024 MECHANICAL STATE — one of the few this lane has confirmed, and it is NOT the result of assuming the newest edition. Effective 2025-03-26 by ARC 8914C, IAB 2/19/25. NOTE THE CHAPTER IS 481 ch. 426 UNDER IOWA CODE s 105 (Plumbing and Mechanical Systems Board), NOT 481 ch. 301 (the State Building Code under Iowa Code s 103A). MECHANICAL IN IOWA IS A LICENSING-BOARD CODE, NOT PART OF THE STATE BUILDING CODE — the row's source_url was previously pointed at the 481.301 building-code chapter, which does not contain this adoption at all; corrected this run.
IOWA'S EDITIONS ARE NOT UNIFORM ACROSS CODE TYPES AND A READER MUST NOT GENERALISE: IMC 2024 (this row, eff. 2025-03-26), UPC 2024 (eff. 2025-03-26, r. 481—425.1 — IOWA IS A UNIFORM PLUMBING CODE STATE, NOT AN IPC STATE), IBC 2024, IRC 2024 and IFC 2024 (all eff. 2025-09-10 under 481 ch. 301 / 481—280.8), but THE ENERGY CODE IS STILL THE 2012 IECC (eff. 2014-03-12, r. 481—301.24 and .25) — FOUR I-CODE CYCLES BEHIND EVERYTHING ELSE IN THE SAME STATE. | Iowa Admin. Code r. 481—426.2(105) (Adoption by reference), ch. 481—426 "State Mechanical Code", Plumbing and Mechanical Systems Board; amendments at r. 481—426.3(105); local authority at new IMC s 102.12 via r. 481—426.3(2); health care deeming at r. 481—426.4(105); enforcement at r. 481—426.5(105). "These rules are intended to implement Iowa Code section 105.4." Adopted by ARC 8914C, IAB 2/19/25, effective 3/26/25. NOT part of the State Building Code (481 ch. 301, Iowa Code s 103A) · source ↗ |
| IPC — International Plumbing Code | NOT ADOPTED AS A CODE. Iowa has no International Plumbing Code adoption. The state plumbing code is the UNIFORM PLUMBING CODE (IAPMO), adopted in part at Iowa Admin. Code r. 481-425.1(105), verbatim: "Sections 101 and 102, Chapters 2 to 17 and Appendices A and M of the Uniform Plumbing Code (UPC), 2024 Edition, as published by the International Association of Plumbing and Mechanical Officials, 4755 E. Philadelphia Street, Ontario, California 91761-2816, are hereby adopted by reference with amendments as the state plumbing code authorized by Iowa Code section 105.4." Iowa is a UPC state, not an IPC state. Named IPC PROVISIONS nonetheless govern in Iowa, but only where Iowa own amendment set imports them (see amendments). | Iowa Admin. Code r. 481-425.1(105) and r. 481-425.4(105) (Iowa Code s. 105.4); ARC 8913C, IAB 2/19/25 · source ↗ |
| IRC — International Residential Code | 2024 IRC — the International Residential Code, 2024 edition, published by the International Code Council, adopted by reference AS HEAVILY CUT DOWN by seventeen subrules. Adopting words verbatim, Iowa Admin. Code r. 481—301.8(103A): "The provisions of the International Residential Code, 2024 edition, published by the International Code Council, located at www.iccsafe.org, are hereby adopted by reference as the requirements for construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal, and demolition of detached one-and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories in height with a separate means of egress and their accessory structures". NO APPENDICES ARE ADOPTED — subrule 301.8(12) deletes appendices AA through CH in their entirety. Iowa is genuinely on the current cycle here, in pointed contrast to its own energy code, which is still on the 2012 IECC (verified row 4be86b25) — SO "IOWA IS A 2024 STATE" IS TRUE FOR THE IRC, IBC, IEBC AND IFC AND FALSE FOR THE IECC. Do not generalize the year across Iowa code types. | Iowa Admin. Code r. 481—301.8(103A) (Residential construction requirements), under Iowa Code s. 103A.8A; statutory applicability Iowa Code ss. 103A.10 and 103A.12; adopted and chapter recodified from Iowa Admin. Code 661—ch. 301 to 481—ch. 301 by ARC 9474C, IAB 8/6/25, effective 9/10/25; editorial change IAC Supplement 11/26/25 · source ↗ |
| NEC — National Electrical Code (NFPA 70) | 2023 NEC — the National Electrical Code, 2023 edition, published by the National Fire Protection Association, incorporated by reference in full. ADOPTING WORDS VERBATIM, Iowa Admin. Code r. 481—404.3(103): "The provisions of the National Electrical Code, 2023 edition, published by the National Fire Protection Association, are incorporated herein by reference". THE ADOPTING BODY IS THE ELECTRICAL EXAMINING BOARD under Iowa Code chapter 103 (Electricians and Electrical Contractors), in Iowa Admin. Code 481 ch. 404 "Electrical Inspection Program" — NOT the State Building Code (481 ch. 301, Iowa Code s 103A) and NOT the Plumbing and Mechanical Systems Board (481 ch. 425/426, Iowa Code s 105). IOWA RUNS AT LEAST FOUR SEPARATE ADOPTING BODIES ON FOUR SEPARATE CYCLES: State Building Code (IBC/IRC/IEBC 2024, eff. 2025-09-10; IECC still 2012, eff. 2014-03-12) · State Fire Marshal (IFC 2024, 481 ch. 280) · Plumbing and Mechanical Systems Board (UPC 2024 and IMC 2024, both eff. 2025-03-26) · Electrical Examining Board (NEC 2023, eff. 2025-07-01). A SINGLE IOWA EDITION BADGE IS WRONG FOR AT LEAST ONE CODE TYPE WHATEVER YEAR IT PRINTS. | Iowa Admin. Code r. 481—404.3(103) (adoption by reference), ch. 481—404 "Electrical Inspection Program", Electrical Examining Board, under Iowa Code chapter 103. Amendments to the adopted NEC at subrules 481—404.3(1), 481—404.3(2) and 481—404.3(3). History line verbatim: "[ARC 9033C, IAB 3/19/25, effective 7/1/25; Editorial change: IAC Supplement 7/9/25]". NOT part of the State Building Code (481 ch. 301, Iowa Code s 103A). · source ↗ |
| UPC — | 2024 UPC — the Uniform Plumbing Code, 2024 Edition, published by the International Association of Plumbing and Mechanical Officials (IAPMO), adopted by reference IN PART. ADOPTING WORDS VERBATIM, Iowa Admin. Code r. 481—425.1(105): "Sections 101 and 102, Chapters 2 to 17 and Appendices A and M of the Uniform Plumbing Code (UPC), 2024 Edition...are hereby adopted by reference with amendments as the state plumbing code authorized by Iowa Code section 105.4."
*** THE ADOPTION IS PARTIAL AND THE CARVE-OUTS BITE. ONLY SECTIONS 101 AND 102 OF CHAPTER 1 COME IN — the rest of UPC Chapter 1 (the model administrative provisions) IS NOT ADOPTED. ONLY APPENDICES A AND M COME IN; EVERY OTHER UPC APPENDIX IS OUT. SERVE UNMODIFIED UPC CH.1 OR ANY APPENDIX OTHER THAN A OR M IN IOWA AND YOU ARE SERVING TEXT THAT IS NOT LAW THERE.
*** IOWA IS A UPC STATE, NOT AN IPC STATE. The paired IPC row (c906db7d) records that Iowa has no International Plumbing Code adoption and that named IPC provisions nonetheless govern only where Iowa's own amendment set imports them. Adopting body is the PLUMBING AND MECHANICAL SYSTEMS BOARD under Iowa Code s 105.4, the same board that adopts the 2024 IMC at 481 ch. 426 on the same effective date — NOT the State Building Code (481 ch. 301, Iowa Code s 103A). | Iowa Admin. Code r. 481—425.1(105) (adoption by reference), ch. 481—425 "State Plumbing Code", Plumbing and Mechanical Systems Board, under Iowa Code section 105.4; amendments at r. 481—425.4(105). History line verbatim: "[ARC 8913C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 4/2/25]". NOT part of the State Building Code (481 ch. 301, Iowa Code s 103A). · source ↗ |