New Hampshire renewal guide
Master Plumber License
If this license is up for renewal, this page gives you the fee, the timeline, and the items that usually hold the filing up.
Start here
What matters before you file.
Check the fee, the renewal window, and the documents or insurance records that can slow approval down.
Issuing authority
Renewal period
Every 24 months
Renewal fee
$300.00
Late penalty
$25.00
Bond requirement
No
Insurance requirement
No
Continuing education
6 hours
Before you renew
Get the filing straight.
- 1
Finish the CE first
Complete the 6 required hours before you start the renewal.
- 2
File with the board
File through New Hampshire Mechanical Safety and Licensing Board (OPLC) and pay the $300.00 renewal fee once the supporting proof is ready.
Renew online - 3
Leave room for processing
Typical processing time is 30 days, so do not wait until the last minute.
If you miss the deadline, the late penalty is $25.00, with a 30-day grace period.
Detailed notes
The fine print is here.
New Hampshire Master Plumber License
The New Hampshire Mechanical Safety and Licensing Board, under the Office of Professional Licensure and Certification (OPLC), issues the Master Plumber license. This license authorizes the holder to own and operate a plumbing business, train apprentices, supervise journeyman plumbers, and perform all types of plumbing installations.
What This License Authorizes
Master Plumbers may perform, supervise, and take responsibility for all plumbing installations, alterations, and repairs. They may own and operate a plumbing contracting business, employ and train apprentices, and supervise journeyman plumbers.
Examination and Experience Requirements
Applicants must have worked as a licensed Journeyman Plumber for a minimum of 6 months before applying for the Master Plumber examination. The exam covers plumbing codes, New Hampshire plumbing laws, and practical plumbing knowledge.
Fees
- Application Fee: $310
- Renewal Fee: $300 (every 2 years)
- Late Fee: $25 per month after 30-day grace period
- Reinstatement Fee: $350 (if expired over 1 year)
Continuing Education
Master Plumbers must complete 6 hours of continuing education per 2-year renewal cycle (3 hours of code update per year). Proof of CE is required at renewal. Each annual course must be different — the same 3-hour course cannot be taken twice for credit.
Renewal Process
- Renewal Period: Every 2 years (expires last day of birth month)
- Renewal Fee: $300
- Grace Period: 30 days from expiration before late fees apply
- Late Fee: $25 per month after the grace period
- Lapsed Over 1 Year: Must retake examination and complete 2 code update courses; $350 reinstatement fee
Consequences of Operating Without a License
Performing plumbing work without a valid license violates RSA 329-A. Penalties include fines, cease-and-desist orders, and potential criminal charges. Unlicensed plumbing work poses serious public health risks and may result in enforcement action by the Board.
*Disclaimer: This information is provided for general reference only and does not constitute legal advice. Always verify current requirements directly with the NH OPLC Mechanical Safety and Licensing Board.*
Official links
Check the board or agency directly.
Required documents
- exam_results
- proof_of_experience
- government_issued_id
Source notes
NH Office of Professional Licensure and Certification — Mechanical Safety and Licensing Board . https://www.oplc.nh.gov/license-fees-mechanical-safety-and-licensing-board-0
Rules move. Check New Hampshire Mechanical Safety and Licensing Board (OPLC) again before you pay, renew, or schedule work around this requirement.
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Next steps
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New Hampshire checklist
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