New Hampshire Plumbing License: What Applies and What Does Not

Does a plumbing business need a license in New Hampshire?

New Hampshire issues 4 license classes for plumbers.

New Hampshire licenses plumbing statewide through the Mechanical Licensing Board, a unit within the Office of Professional Licensure and Certification. Both the individual and the business entity are licensed, and plumbing apprentices hold registration licenses. Statute defines a master plumber to include a person, firm, corporation or limited liability company that hires plumbers or does the work as its own business.

The plumbing business itself must be licensed or registered, not only the people doing the work.

All business entities, corporations, partnerships, limited liability companies and limited liability partnerships performing plumbing in New Hampshire must be licensed under the board's rules and registered with the secretary of state. The entity license is issued where an officer, partner, managing member or designee holds an active master plumber license, and the entity must show good standing and liability insurance.

This records what New Hampshire publishes, not a determination about your business. Scope, thresholds and local requirements are set by the issuing body, so confirm with them before you bid or file.

Verified 2026-09-03 against the primary source listed under Sources.

What the LLC has to do first

Several states license the plumbing company separately from the individual plumber, so the LLC and the license are two filings, not one.

The entity filing is separate from anything the license requires. In New Hampshire it is made with the New Hampshire Secretary of State. File directly with the state here. The order matters wherever the license is issued to the company rather than to a person: the entity has to exist before an application can name it.

Forming an LLC as a plumbing business in New Hampshire covers the filing itself, step by step.

Insurance New Hampshire plumbers are asked to show

Plumbing license and registration schemes commonly require proof of general liability cover, and water damage from a failed connection is the claim these policies are bought for.

We do not publish New Hampshire premium figures for this trade, so nothing here is a quote. Our business insurance guide for plumbers covers what each policy does and does not pay for.