The Laramie County Planning and Development Office manages permits for all unincorporated areas of the county. The City of Cheyenne operates its own independent building and planning department for properties within city limits. Development in unincorporated areas is subject to specific flood hazard area regulations and wildland-urban interface fire codes.
How this fits with the state
The state authority here is Wyoming state trade boards; local building departments. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.