State plumbing guide · NH
Plumbing in New Hampshire
New Hampshire licenses plumbers at every level through its Mechanical Licensing Board and includes an IPC-based plumbing code in its state building code. Long, cold winters make freeze protection essential.
- Median home built
- 1980
- Built before 1980
- 51%
- Owner-occupied
- 73%
- Winter
- Long, hard freezes
- General statewide rating
- Plumbing code
- IPC
- City guides
- 1
Housing figures: U.S. Census Bureau, ACS 2024 1-year (B25035, B25034).
New Hampshire city plumbing guides
How to check a plumber's license in New Hampshire
Plumbers in New Hampshire are licensed by the Mechanical Licensing Board under the Office of Professional Licensure and Certification. [1]
Seasonal problems to plan for in New Hampshire
- Winter
- Hard freezes: protect exposed pipes, disconnect hoses. Frozen pipes.
- Spring
- Snowmelt and mud season raise groundwater; test sump pumps.
New Hampshire's older housing stock
Statewide, the median home was built in 1980 and 51% of homes predate 1980. Homes like that were usually built with copper or CPVC supply, plastic drains, and in some homes gray polybutylene supply pipe. The city guides below show how much that varies within the state.
Which plumbing code applies in New Hampshire
New Hampshire's state building code includes a plumbing code based on the International Plumbing Code with state amendments. [2]
New Hampshire plumbing questions
How do I check a plumber's license in New Hampshire?
Verify the license with New Hampshire OPLC's online license lookup.
Which plumbing code applies in New Hampshire?
The plumbing portion of the New Hampshire State Building Code, based on the International Plumbing Code with state amendments.
Sources (3)
- U.S. Census Bureau, ACS 2024 1-year (B25035, B25034) · checked 2026-10-01
- New Hampshire OPLC, Mechanical Licensing Board · checked 2026-10-01
- New Hampshire Department of Safety, State Building Code amendments summary · checked 2026-10-01