Wyoming Building Codes in 2026: Editions, Scope and AHJ

Direct answer and reference scope

Wyoming Building Codes in 2026: Editions, Scope and AHJ is a Harth adoption and amendment guide for Wyoming. Wyoming's adopted 2024 I-Codes, 2026 NEC effective date, State Fire Marshal scope, and the local-enforcement checks architects need before permitting. Use the Wyoming State Fire Marshal to confirm the code edition currently adopted for the project, and compare the model text with state amendments, local amendments, effective dates and the permit authority's interpretation. The ICC code library is the model-code publication path. This Harth page summarizes adoption records and amendment sources; it does not reproduce the controlling code, provide a legal opinion or confirm which edition controls a particular address. Record the project jurisdiction, application date, occupancy, construction type and amendment set before relying on a section. Where this page conflicts with an official publication or the authority having jurisdiction, the official source controls.

Authored and prepared by Harth from the linked agency records. Review scope: adoption status and source paths verified; project-specific applicability and local interpretation require AHJ confirmation.

Direct answer

Wyoming’s State Fire Marshal lists the 2024 International Building, Fire, Existing Building, Mechanical and Fuel Gas Codes as the state-adopted editions. Wyoming uses the 2026 National Electrical Code from July 1, 2026. The state list does not present the IRC, IECC or plumbing code as a single statewide package, so residential, energy and plumbing requirements must be confirmed with the city, county and other agency serving the project.

Current statewide code baseline

The Council on Fire Prevention and Electrical Safety voted to move the listed fire-and-life-safety codes from the 2021 to 2024 editions in 2024. The rulemaking statement of reasons records that action.

Who is the authority having jurisdiction?

Wyoming Statute 35-9-121 allows the State Fire Marshal to delegate complete enforcement authority to qualifying municipalities and counties. A delegated local authority must maintain standards equivalent to or more stringent than the state baseline, and a more stringent local provision prevails. The Fire Marshal retains defined state responsibilities, including state-owned or leased buildings unless authority has been transferred.

Start with the project address, then establish:

1. whether the city or county has delegated building, fire or electrical authority;
2. which local ordinance adopted the code and its amendments;
3. whether the project falls within the State Fire Marshal’s plan-review scope; and
4. the edition tied to the permit application date.

Wyoming project code-basis worksheet

Do not treat “Wyoming uses the 2024 IBC” as the whole code analysis. The adopted state standard, delegated local authority, project type and other discipline codes must be read together.