Building permits in Montana
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 license; construction contractors with employees must register (Construction Contractor Registration, tied to Workers' Comp compliance); those with no employees may register voluntarily.
Montana Dept. of Labor & Industry — Construction Contractor Registration (CCR)