Building permits in Delaware
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 competency license; contractors need a state business license from the Division of Revenue, and any competency/GC licensing is handled locally.
Delaware Division of Revenue (business license); local jurisdictions for GC competency