Wyoming — Code Adoption Summary
Adoption model: Home-rule / voluntary-for-private-construction — the state (Dept. of Fire Prevention & Electrical Safety) sets reference minimums that apply mainly to public buildings and areas without local enforcement; for the vast majority of private projects, the local city/county AHJ governs and may adopt entirely different editions.
Last verified: 2026-07-03
Confidence: verified
Primary sources: WY Dept. of Fire Prevention & Electrical Safety · ICC WY
State reference minimums (narrow applicability — public buildings / no-local-enforcement areas)
| Code family | Adopted edition | Notes | Source |
|---|
| Electrical (NEC) | NEC 2023 | state-adopted reference | meltplan.com |
| Energy | IECC 2021 (state minimum where it applies) | no mandatory statewide energy code for private construction — residential/commercial energy compliance is voluntary absent local adoption | meltplan.com |
| Plumbing | IPC 2018 (state level) | WY = IPC at the state-reference level | meltplan.com |
| Building/Residential/Mechanical | IBC/IRC/IMC referenced at state level, narrow applicability | | " |
Adoption model & precedence
- For the vast majority of private projects, the local city/county building department is the actual governing authority — it may adopt a different edition entirely from the state reference table above, and has full authority to set local amendments.
- The state minimums apply narrowly: public buildings, and areas that have no local building-code enforcement at all (common in rural Wyoming).
- AHJ = local jurisdiction first; state reference minimum only as a fallback where no local authority exists.
Major cities / counties
| Jurisdiction | Notes | Building dept. |
|---|
| Cheyenne | Local adoption — confirm directly | cheyennecity.org |
| Casper | Local adoption — confirm directly | casperwy.gov |
| Laramie | Local adoption — confirm directly | cityoflaramie.org |
AHJ fallback (when local adoption is unverified)
- Narrow state floor (public buildings / no-local-enforcement areas only): NEC 2023, IECC 2021, IPC 2018.
- Action: for any private project, confirm the specific city/county's adopted editions first — the state table is a fallback, not the default answer.
Change log
- 2026-07-03 — created; verified narrow state-reference-minimum structure (NEC 2023, IECC 2021, IPC 2018) applying mainly to public buildings/no-enforcement areas, with local AHJs governing private construction.
