Building permits in Illinois
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 statewide general-contractor license; Chicago requires GC registration and separately licenses trades (electrical, plumbing). Local permits required.
City of Chicago Dept. of Buildings (GC registration) + IDFPR (trades)