Plumbing license requirements in New Hampshire
The New Hampshire Mechanical Licensing Board (OPLC) issues plumbing licenses in New Hampshire. Here's what each license level takes, from the official rules.
Issued by
New Hampshire Mechanical Licensing Board (OPLC)
Official siteRequirements checked October 21, 2026
License levels
In order, from the first license to the top one.
- 1
Journeyman Plumber
A completed apprenticeship, a letter from the licensed plumber who supervised it, and a passing exam score.
Official source - 2
Master Plumber
Work as a journeyman plumber, a letter from the licensed plumber who supervised it, and a passing master exam score.
Official source
Rules, fees and exam schedules change. Confirm the details with the New Hampshire Mechanical Licensing Board (OPLC) before you apply.
Plumbers in New Hampshire
From the Bureau of Labor Statistics. See a city for local wages and contractor counts.
- Plumbers employed
- 1,950
- Median hourly wage
- $32.12
Plumbing market data by city
Once you're licensed
Tradesman runs the business side for plumbers: estimates, scheduling, invoicing and payments in one app.
Plumbing licensing in New Hampshire: common questions
Who issues plumbing licenses in New Hampshire?
The New Hampshire Mechanical Licensing Board (OPLC). The license levels and what each takes are listed above, with a link to the official source for each.
What does the Master Plumber license take in New Hampshire?
Work as a journeyman plumber, a letter from the licensed plumber who supervised it, and a passing master exam score.
What's the first plumbing license in New Hampshire?
The Journeyman Plumber. A completed apprenticeship, a letter from the licensed plumber who supervised it, and a passing exam score.
Licensed and ready for more customers?
Tradesman handles estimates, scheduling and invoicing so you can spend your time on the work. Now in early access.