Massachusetts plumbing and gas fitting: licenses, permits and hiring

Source: Local Help Stations (localhelpstations.com). Last updated November 2, 2026.

Massachusetts plumbing rules here come from General Laws chapter 142 and the Board of State Examiners of Plumbers and Gas Fitters.

What Massachusetts rules say

Only a master or journeyman plumber licensed by the state board, with a local permit, can do plumbing at your home. (source: Massachusetts Division of Occupational Licensure)
The local plumbing inspector must issue a permit before plumbing is installed, changed, removed or repaired. (source: Massachusetts Division of Occupational Licensure)
Permits go only to licensed plumbers. (source: Massachusetts Division of Occupational Licensure)
Small fixes like a leaky faucet or a clogged drain do not need a permit, but replacing a faucet or piping does. (source: Massachusetts Division of Occupational Licensure)
A licensed plumber may also do gas fitting, but a gas fitter may not do plumbing. (source: Massachusetts Division of Occupational Licensure)
Any plumber sign, listing or ad must show the license designation and number. (source: Massachusetts Legislature)
A journeyman must show the license whenever a plumbing or gas inspector asks. (source: Massachusetts Legislature)
When pulling a permit, the plumber must swear to carrying liability insurance or present a waiver you signed. (source: Massachusetts Division of Occupational Licensure)
The board suggests three estimates and paying in stages as the work progresses. (source: Massachusetts Division of Occupational Licensure)

This page covers statewide rules only. Cities and counties can add their own permits and licenses, so check with your local building office too.

Last updated: November 2, 2026