| IBC — International Building Code | 2021 | WAC 51-50-003 (State Building Code chapter 51-50 WAC, "Adoption and amendment of the 2021 edition of the International Building Code"), auth. RCW 19.27.031 and 19.27.074; permanent rule WSR 23-20-023 filed 2023-09-25, effective 2024-03-15 · source ↗ |
| IECC — International Energy Conservation Code | 2021 | WAC 51-11C-10100 and WAC 51-11R-10100 (2021 Washington State Energy Code, chapters 51-11C and 51-11R WAC); CR-103 permanent adoptions WSR 24-03-085 and WSR 24-03-084, both filed 2024-01-16, effective 2024-03-15; authority RCW 19.27A.020, 19.27A.025, 19.27A.045 · source ↗ |
| IFC — | 2021 | WAC 51-54A-003 (State Building Code chapter 51-54A), auth. RCW 19.27.031 and 19.27.074; permanent rules WSR 23-20-027 (filed 2023-09-25) and WSR 23-22-119 · source ↗ |
| IMC — International Mechanical Code | 2021 IMC | WAC 51-52-003 (WSR 23-23-105), authority RCW 19.27.031 and 19.27.074 · source ↗ |
| IPC — International Plumbing Code | not-adopted | RCW 19.27.031 (state building code names the Uniform Plumbing Code, not the IPC); plumbing code in force adopted at WAC 51-56-003 (2021 UPC), permanent rule WSR 23-23-108 filed 2023-11-15, effective 2024-03-15; authority RCW 19.27.031 and 19.27.074 · source ↗ |
| IRC — International Residential Code | 2021 | WAC 51-51-003 (State Building Code chapter 51-51 WAC, "Adoption and amendment of the 2021 edition of the International Residential Code"), auth. RCW 19.27.031 and 19.27.074; permanent rule WSR 23-23-104, effective 2024-03-16 · source ↗ |
| NEC — National Electrical Code (NFPA 70) | 2023 NEC | WAC 296-46B-010 (adoption by reference, ch. 296-46B WAC, Electrical Safety Standards, Administration, and Installation), authority ch. 19.28 RCW, RCW 19.28.031 and 19.28.251; 2023 NEC brought in by permanent rule WSR 24-05-085 filed 2024-02-21, effective 2024-04-01; most recent amendment WSR 25-23-069 filed 2025-11-18, effective 2025-12-19 · source ↗ |
| UPC — | 2021 UPC — the 2021 edition of the Uniform Plumbing Code published by IAPMO, adopted by reference WITH APPENDICES A, B, I AND M and WITH CHAPTERS 12 AND 14 NOT ADOPTED, plus two further carve-outs (venting/combustion-air of fuel-fired appliances in ch. 5, and the portions addressing building sewers). EFFECTIVE 2024-03-15, statewide. NOT the 2024 UPC. Washington is a UPC state, not an IPC state — RCW 19.27.031 names the Uniform Plumbing Code, and the sibling IPC row (203e7736) correctly records the IPC as not adopted. | WAC 51-56-003 (State Building Code, chapter 51-56 WAC, "STATE BUILDING CODE ADOPTION AND AMENDMENT OF THE 2021 EDITION OF THE UNIFORM PLUMBING CODE"), authority RCW 19.27.031 and RCW 19.27.074. Adopted by the State Building Code Council. Statewide.
ADOPTING TEXT READ FIRST-HAND 2026-09-25 at app.leg.wa.gov, VERBATIM: "The 2021 edition of the Uniform Plumbing Code, including Appendices A, B, I, and M, published by the International Association of Plumbing and Mechanical Officials" is adopted by reference.
EXCLUSIONS, from the same section: Chapters 12 and 14 are NOT adopted; also excluded are the requirements addressing venting and combustion air of fuel-fired appliances found in chapter 5, and the portions addressing building sewers.
FILING/EFFECTIVE NOTE, from the same section: Statutory Authority RCW 19.27.031 and 19.27.074; most recent filings WSR 23-02-057, WSR 23-12-110 and WSR 23-20-029, EFFECTIVE MARCH 15, 2024.
PRIOR STATE OF THIS ROW (corrected by run 1768): adoption_citation was the NINE CHARACTERS "WAC 51-56" — a chapter number with no section, no quoted text and no authority, THE SHORTEST CITATION THIS SWEEP HAS FOUND IN ANY STATE, beating West Virginia's 8-character "87 CSR 4" only because that one at least named an instrument. effective_date was NULL, verified_at was NULL, and source_url pointed at the SBCC landing page rather than an instrument. Now closed from the codified rule itself. · source ↗ |
| WSEC — | 2021 WSEC — the 2021 Washington State Energy Code, a STATE-WRITTEN code in two parts: WSEC-Residential, chapter 51-11R WAC, and WSEC-Commercial, chapter 51-11C WAC. EFFECTIVE 2024-03-15 in all counties and cities of the state. NOT an adoption-by-reference of the IECC — see the amendments field: Washington CODIFIES THE SUBSTANTIVE CODE TEXT ITSELF IN THE WAC, section by section, and the WSEC is what governs. The sibling IECC row (bf7d5db4) records the same instrument from the model-code side; this row is the state-code side of the same fact. Do not record 2024 or 2027: as of 2026-09-25 the 2021 WSEC is the code in force. | WAC 51-11R-10100 (Washington State Energy Code-Residential, chapter 51-11R WAC) and WAC 51-11C-10100 (Washington State Energy Code-Commercial, chapter 51-11C WAC), adopted by the State Building Code Council. Authority RCW 19.27A.020, RCW 19.27A.045, RCW 19.27A.160 and chapter 19.27A RCW. Statewide.
ADOPTING TEXT READ FIRST-HAND 2026-09-25 at app.leg.wa.gov, WAC 51-11R-10100, VERBATIM:
SHORT TITLE: "This code shall be known as the Washington State Energy Code-Residential, and shall be cited as such."
EFFECTIVE DATE, in the rule text itself: "The Washington State Energy Code adopted under chapter 51-11R WAC shall become effective in all counties and cities of this state on March 15, 2024."
FILING NOTE: "WSR 24-03-084, s 51-11R-10100, filed 1/16/24, effective 3/15/24." The commercial counterpart is WSR 24-03-085 (chapter 51-11C WAC), filed the same day, same effective date.
**THE SECTION DOES NOT ADOPT THE INTERNATIONAL ENERGY CONSERVATION CODE BY REFERENCE. It establishes Washington's own residential energy code.**
PRIOR STATE OF THIS ROW (corrected by run 1768): adoption_citation was 47 characters, "Washington State Energy Code, WAC 51-11C/51-11R", with no section, no quoted text, no authority; effective_date NULL; verified_at NULL; source_url pointing at the SBCC landing page rather than an instrument. · source ↗ |