Oklahoma Plumbing License Requirements
Yes. Oklahoma licenses plumbers through the Oklahoma Construction Industries Board, Plumbing. It issues apprentice, journeyman and contractor credentials.
State plumber license · By BrazeJobs Team · Updated
License tiers
| Apprentice | Registration |
| Journeyman | State license |
| Master | No state license |
| Contractor | Plumbing Contractor (journeyman reqs + 1 year) |
Requirements
| Classroom hours | 500-hour Career Tech route |
| Exam | State exam |
| Minimum age | 18 |
| Fees | Contractor: application $30, initial $300, renewal $200 |
| Renewal | Annual |
| Continuing education | 6 hours per 3 years |
| Local license | No (state license covers) |
| Board | Oklahoma Construction Industries Board, Plumbing |
Exam
| Exam provider | PSI (for Construction Industries Board) |
| Format | Open book |
| Questions | Residential journeyman plumbing and natural gas: 85 |
| Time | 180 minutes |
| Passing score | 70% (from Nov 1, 2026; was 75%) |
| Bulletin date | 2026-09-11 |
Bulletin says passing changes from 75% to 70% effective Nov 1, 2026.
- Source: oklahoma.gov · checked November 6, 2026
Apprenticeship
| Registering agency | U.S. Department of Labor Office of Apprenticeship (no state agency) |
Programs register through the Office of Apprenticeship; use the Partner Finder for local sponsors.
- Source: apprenticeship.gov · checked November 6, 2026
Plumbing code
| Code in force | 2024 IPC with state amendments |
OUBCC permanent rule effective Sep 14, 2026 (replaced 2018 IPC).
- Source: oklahoma.gov · checked November 5, 2026