New Hampshire contractor licensing: what actually requires a license
New Hampshire has no statewide general contractor license, and most towns add little on top, so a GC, carpenter, or remodeler can work without a state credential. The state does license specific trades through the Office of Professional Licensure and Certification (OPLC): electricians through the Electricians' Board, and plumbers and fuel gas fitters through the Mechanical Safety and Licensing Board, plus asbestos and lead abatement work. If you touch wiring at 30 volts or higher or plumbing systems, you need the trade license, not a GC one.
Licensing authority
New Hampshire Office of Professional Licensure and Certification (OPLC): https://www.oplc.nh.gov
When a license is required
There is no dollar threshold because there is no general contractor license: general building and remodeling work requires no state credential in New Hampshire. Licensing kicks in by trade, not job size. Electrical work at 30 volts or higher requires a licensed electrician, and plumbing and fuel gas fitting require licenses from the Mechanical Safety and Licensing Board.
License classes in New Hampshire
Electrician licenses (Electricians' Board)
Apprentice, journeyman, and master tiers. Apprentices must register with OPLC, and a license is required for work involving 30 volts or higher. Masters can pull permits and supervise crews.
Plumbing and gas fitting licenses (Mechanical Safety and Licensing Board)
Covers plumbers and fuel gas fitters. A master plumber candidate completes a four-year apprenticeship of at least 8,000 on-the-job hours plus 576 classroom hours before sitting the exam.
Asbestos and lead abatement credentials
Abatement work is state-regulated with its own certifications. Renovation contractors disturbing old surfaces in pre-1978 homes also live under federal EPA RRP rules.
What you need before you apply
- No state license, registration, or exam for general contracting or remodeling work
- Electrical work at 30 volts or higher requires an OPLC electrician license
- Plumbing and fuel gas work require Mechanical Safety and Licensing Board licenses
- Master plumber candidates need a four-year apprenticeship with at least 8,000 on-the-job hours and 576 classroom hours
- Apprentices in licensed trades must register with OPLC before working
- Building permits still run through your town or city, with inspections to local codes
- Carry general liability and workers compensation appropriate to your crew, since customers and GCs will ask even though the state does not
- Confirm current trade rules with OPLC before starting, since board requirements and fees change
How to get licensed in New Hampshire
- Confirm whether your trade is licensed. General building work needs no state credential. Electrical, plumbing, gas fitting, and abatement do. If you are in a licensed trade, everything below applies; if not, skip to permits and insurance.
- Register as an apprentice and log hours. Licensed trades in New Hampshire are apprenticeship-driven. Register with OPLC, work under a licensed journeyman or master, and accumulate the required on-the-job and classroom hours.
- Sit the journeyman then master exams. Apply to the relevant board, document your hours, and pass the exam for each tier. The master tier is what lets you pull permits and run your own shop in that trade.
- Set up the business layer. Register your business with the state, carry liability insurance, and get workers compensation if you have employees. None of this is board-issued, but jobs and GC contracts require it.
- Check town requirements before each new market. Most New Hampshire towns keep requirements minimal, but permits and inspections are always local. Verify with the building department, and confirm trade rules with OPLC, before you take the first job in a new town.
Reciprocity with other states
For the licensed trades, New Hampshire boards can credit out-of-state licenses and documented apprenticeship hours toward qualification, and the Electricians' Board has historically recognized equivalent licenses from some New England states. Rules differ by board and change, so ask OPLC about your specific license before assuming it transfers.
Working without a license
Doing electrical, plumbing, or gas work without the required license is a criminal matter in New Hampshire and brings OPLC enforcement, fines, and orders to stop work. For unlicensed general contracting there is no license to violate, but consumer protection law still applies, and the Attorney General pursues contractors who take deposits and fail to perform.
Frequently asked questions
Do general contractors need a license in New Hampshire?
No. New Hampshire has no statewide general contractor license or registration, and most towns require little beyond permits. The state licenses specific trades instead: electrical, plumbing, fuel gas fitting, and asbestos and lead abatement, all through OPLC boards.
What electrical work can I do without a license in New Hampshire?
Very little on a paid basis. New Hampshire requires an active electrician license for work involving 30 volts or higher, which covers essentially all wiring a customer would pay for. Homeowners can wire their own single-family home, but hired work needs a licensed electrician.
How long does it take to become a master plumber in New Hampshire?
Plan on four years minimum. The path runs through an apprenticeship of at least 8,000 on-the-job hours plus 576 classroom hours, then the journeyman exam, then master licensure. There is no shortcut through the hours, though out-of-state experience may be credited.
Can I use my Massachusetts or Maine trade license in New Hampshire?
Sometimes. New Hampshire boards can credit out-of-state licenses and hours toward their requirements, and some equivalent licenses have been recognized directly. It is board-specific and changes over time, so contact OPLC with your license details rather than assuming it transfers.
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