(a) Effective July 1, 2024, all industrialized housing and buildings, modules, and modular components, shall be constructed in accordance with the codes referenced in subsection (c) - (j). The 2015 editions of the International codes as identified in subsection (c) - (i), as well as the 2014 edition of the National Electrical Code identified in subsection (j), shall remain in effect through June 30, 2024. All work permitted or started before July 1, 2024, may be completed with the 2015 editions of the International codes and the 2014 edition of the National Electrical Code.
(b) Other codes referenced in any of the mandatory building codes adopted in subsection (c) - (j), shall be considered part of the requirements of these codes to the prescribed extent of each such reference.
(c) The International Building Code, 2021 edition, published by the International Code Council, is adopted as the Building Code of the Texas Industrialized Housing and Buildings Program.
(d) The International Residential Code, 2021 edition, published by the International Code Council, is adopted as the Residential Code for one- and two-family dwellings of the Texas Industrialized Housing and Buildings Program.
(e) The International Fuel Gas Code, 2021 edition, published by the International Code Council, is adopted as the Fuel Gas Code of the Texas Industrialized Housing and Buildings Program.
(f) The International Mechanical Code, 2021 edition, published by the International Code Council, is adopted as the Mechanical Code of the Texas Industrialized Housing and Buildings Program.
(g) The International Plumbing Code, 2021 edition, published by the International Code Council, is adopted as the Plumbing Code of the Texas Industrialized Housing and Buildings Program.
(h) The International Energy Conservation Code, 2015 edition, published by the International Code Council, is adopted as the Energy Conservation Code of the Texas Industrialized Housing and Buildings Program.
  (1) The applicable edition of the International Energy Conservation Code is the edition adopted by rule by the State Energy Conservation Office pursuant to Chapter 388, Health and Safety Code.
  (2) Conflicts between editions of the International Building Codes and the adopted version of the International Energy Conservation Code shall be resolved in favor of the more stringent code. If the more stringent code cannot be determined, the department shall make a determination as to which code controls.
(i) The International Existing Building Code, 2021 edition, published by the International Code Council, is adopted as the Existing Building Code for industrialized buildings that are altered in accordance with §70.74(f).
(j) The National Electrical Code, 2020 edition, published by the National Fire Protection Association, is adopted as the Electrical Code of the Texas Industrialized Housing and Buildings Program.
(k) The effective dates of adoption of past editions of the mandatory building codes are as follows:
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Source Note: The provisions of this §70.100 adopted to be effective August 1, 2017, 42 TexReg 676; amended to be effective March 1, 2024, 49 TexReg 1077; amended to be effective July 1, 2024, 49 TexReg 4585