Requirements, license levels, and the issuing authority, sourced from New Hampshire's official board.
The board's own application checklists are the authoritative source here and they are revised regularly. Download the current packet before starting: New Hampshire's plumbing requirements are set in those documents rather than in a single statutory table.
| Requirements | NEW HAMPSHIRE PUTS PLUMBING UNDER ITS MECHANICAL SAFETY AND LICENSING BOARD rather than a dedicated plumbers' board, the same board covers the broader mechanical trades, so start at the mechanical board's pages rather than searching for a plumbing board that does not exist. THE APPRENTICE REGISTRATION COMES FIRST. The board publishes a Plumbing Apprentice information packet setting out how to apply, and the registration is what makes the trade time count toward the journeyman license. JOURNEYMAN AND MASTER PLUMBER applications are made on the board's combined journeyman/master plumber application checklist, which sets out the current experience documentation, examination and fee requirements. The board also publishes a plumbing examination candidate bulletin covering the papers themselves. Because the board revises these packets periodically, the journeyman and master checklist carries a 2025 revision date, work from the current packet on the board's site rather than from a summary. |
| Reciprocity | The Mechanical Safety and Licensing Board assesses out-of-state applicants against its own experience and examination standards; there is no published blanket waiver. Apply through OPLC and confirm the current position with the board. |
| Renewal | Licenses renew through OPLC on the board's published cycle; the board's applications page carries the current renewal forms and fees. |
| Notes | The board's own application checklists are the authoritative source here and they are revised regularly. Download the current packet before starting: New Hampshire's plumbing requirements are set in those documents rather than in a single statutory table. |
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Sources: www.oplc.nh.gov, www.oplc.nh.gov, www.oplc.nh.gov, www.oplc.nh.gov. Always confirm current requirements with the issuing authority.
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