Maryland Plumbing License Requirements
Yes. Maryland licenses plumbers through the Maryland State Board of Plumbing. It issues apprentice, journeyman, master and contractor credentials. A journeyman license takes 7,500 hours of work experience.
State plumber license · By BrazeJobs Team · Updated
License tiers
| Apprentice | Apprentice license (age 16+) |
| Journeyman | State license (4 years as licensed apprentice) |
| Master | Master Plumber/Gas Fitter (journeyman 2 years + 3,750 hours) |
| Contractor | Master |
Requirements
| Journeyman experience | 7,500 over 4 years |
| Classroom hours | 32 hours backflow prevention training |
| Exam | Exam |
| Minimum age | 16 (apprentice) |
| Renewal | 2 years |
| Local license | No (state license covers) |
| Board | Maryland State Board of Plumbing |
Licensed in another state or the military
| Reciprocity | DC accepts MD plumbing licenses |
| Military spouses | Active-duty servicemembers and spouses with Maryland orders may practice on a good-standing out-of-state license for the duration of orders |
Not permanent licensure; separate application for a full Maryland license.
- Source: labor.maryland.gov · checked November 6, 2026
Apprenticeship
| Registering agency | State Apprenticeship Agency (Maryland Labor Office of Apprenticeship) |
- Source: apprenticeship.gov · checked November 6, 2026
- Source: labor.maryland.gov · checked November 6, 2026
Plumbing code
| Code in force | 2021 IPC |
Maryland Board of Plumbing: 2021 IPC; local jurisdictions may adopt their own plumbing code.
- Source: labor.maryland.gov · checked November 5, 2026