Washington
For Washington, chart as of is January 2024; ibc edition in force (from the state's own regulation) is 2021; irc edition in force (from the state's own regulation) is 2021; adopting regulation is WAC 51-50-003 (IBC), WAC 51-51-003 (IRC); ibc edition is 18, recorded from its source on 2026-09-30; source re-checked 2026-10-10.
- State or territory
- Washington verified
- Chart as of
- January 2024
- IBC edition in force (from the state's own regulation)
- 2021 verified
- IRC edition in force (from the state's own regulation)
- 2021 verified
- Adopting regulation
- WAC 51-50-003 (IBC), WAC 51-51-003 (IRC) our reading
- IBC edition
- 18 verified
- IRC edition
- 18 verified
- IFC edition
- 18 verified
- IMC edition
- 18 verified
- IPC edition
- X verified
- IFGC edition
- 18 verified
- IgCC edition
- X verified
- IPMC edition
- X verified
- IEBC edition
- 18 verified
- ISPSC edition
- 18 verified
- ICCPC edition
- X verified
- IWUIC edition
- 18 verified
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
Washington 18 18 18 18 X 18 X 18 18 X 18 18 X 18
— iccsafe.org, retrieved 2026-09-30
Where each value comes from
These values are stated in different places, and not all on the same page, so each is shown with the passage that states it and the source that passage came from.
IBC edition in force (from the state's own regulation)
The 2021 edition of the International Building Code, including Appendix E, published by the International Code Council is hereby adopted by reference with the exceptions noted in this chapter of the Washington Administrative Code.
— from app.leg.wa.gov, retrieved 2026-09-30
IRC edition in force (from the state's own regulation)
The 2021 edition of the International Residential Code as published by the International Code Council is hereby adopted by reference with the following additions, deletions, and exceptions:
— from app.leg.wa.gov, retrieved 2026-09-30
Sources
- iccsafe.orghttps://www.iccsafe.org/wp-content/uploads/Master-I-Code-Adoption-Chart-1.pdf
- app.leg.wa.govhttps://app.leg.wa.gov/WAC/default.aspx?cite=51-50-003
- app.leg.wa.govhttps://app.leg.wa.gov/WAC/default.aspx?cite=51-51-003