Building permits in Idaho
1 jurisdictions, each with the department that issues, its portal and its phone number. Cities issue their own permits; counties cover unincorporated areas, which is the distinction that sends most contractors to the wrong office.
1 checked against the department's own page
Licensing
No competency exam, but statewide contractor registration is required for any construction work valued at $2,000 or more (DOPL Contractors Board).
Idaho Contractors Board — Division of Occupational & Professional Licenses (DOPL)