New Hampshire — plumbing code & licensing
Verified
The code
| Code family | IPC |
| Edition in force | 2021 |
| Effective date | 2025-07-01 |
| Adopted by | State Building Code Review Board; code defined by RSA 155-A:1 IV and ratified by the legislature per RSA 155-A:10 |
| Adoption source | https://mm.nh.gov/files/uploads/fmo/remote-docs/summary-of-2021-building-code-amendments-effective-1oct2025.pdf |
| State amendments | Amendments ride in the adoption document itself — https://mm.nh.gov/files/uploads/fmo/remote-docs/summary-of-2021-building-code-amendments-effective-1oct2025.pdf |
Licensing
| Model | state individual |
| Authority | Mechanical Licensing Board, Office of Professional Licensure and Certification (OPLC) |
| Licensing source | https://www.oplc.nh.gov/new-changes-reciprocity-new-hampshire |
| License classes | https://www.oplc.nh.gov/new-changes-reciprocity-new-hampshire |
Permits & inspections
Not yet recorded.
How this record was verified
| Adoption | Verified |
| Amendments | Verified |
| Licensing | Verified |
| Permits & inspections | Not yet verified |
Working notes
State building code includes the International Plumbing Code 2021 with NH amendments. The Board's official amendments summary (Oct. 15, 2025) states the applicable codes and amendments were ratified by the General Court per HB134-2025, effective July 1, 2025; that current-ratification date is recorded as the effective date. Licensing: Journeyman Plumber and Master Plumber under RSA 153:27-38 (Mechanical Licensing Board), administered by OPLC. NOTE: plumbing licensure in NH now sits with the Mechanical Licensing Board/OPLC; older references to RSA 329-A are superseded. oplc.nh.gov was reachable in this lane (no Akamai block encountered).
Reference only. Compiled from the cited official sources as of the date shown; adoptions and rules change. Confirm with the authority having jurisdiction before designing or permitting work.