Plumber License Requirements in Delaware
License RequiredLast verified March 9, 2026
Agency And Exam
Issuing agency: Delaware Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners
Official licensing agency website
Exam provider: PSI
Reciprocity And License Levels
License levels
Journeyman PlumberMaster Plumber
Reciprocity states
CTIAMD
Notes
Delaware requires licensure to perform plumbing work in the state. Current Board materials explain that journeyman status comes from a federally approved plumbing apprenticeship program, master plumber applicants must pass the Delaware master exam, and Delaware currently treats Connecticut, Iowa, and Maryland as substantially similar jurisdictions for master plumber reciprocity review. Verified against Delaware plumbing licensing materials on 2026-03-09.