Do I Need a Building Permit in Wyoming?
Quick Answer
It depends on your jurisdiction — Wyoming has no statewide building code, and many unincorporated areas require no building permit at all.
Wyoming has no statewide building code
Under Wyoming Statute § 35-9-106, the Council on Fire Prevention and Electrical Safety adopts minimum fire, building, mechanical, existing-building, and fuel-gas standards (not exceeding the International Codes). But § 35-9-121 makes local enforcement opt-in: a city or county must apply to the State Fire Marshal for enforcement authority and adopt standards at least as stringent as the state's — otherwise no local building code applies at all.
Many areas require no permit
In practice this produces a fragmented picture: some cities and counties (for example Laramie County and Natrona County) have adopted and enforce their own building codes, while many unincorporated county areas genuinely require no building permit for general construction. Confirm your specific jurisdiction's adoption status before you build — do not assume a permit is or isn't required.
Electrical is different — enforced statewide by default
Electrical permitting is handled statewide: under § 35-9-119, the State Fire Marshal's Chief Electrical Inspector enforces the National Electrical Code across Wyoming by default, except in localities separately granted their own certified electrical-enforcement authority. So your electrical permit may come from the state program or your local jurisdiction depending on which currently holds delegated authority.
How to find out for your project
Confirm whether your city or county holds delegated building-enforcement authority (the Wyoming State Fire Marshal maintains a local and state jurisdictions listing), then confirm the current building-code adoption status, if any, and who issues the electrical permit — the state program or your jurisdiction — directly with that office before submitting plans.
Bottom Line
No statewide building code. Confirm your jurisdiction's adoption status first — many Wyoming areas need no building permit, but electrical is enforced statewide by default under the National Electrical Code.