Building permits in Ohio
3 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.
3 checked against the department's own page
Licensing
The state OCILB license covers only commercial specialty trades (electrical, plumbing, HVAC, hydronics, refrigeration); there is no statewide general-contractor license — GC licensing is local.
Ohio Construction Industry Licensing Board (OCILB) — Dept. of Commerce (trades); local for GC