Code Administration, Permits, and Inspections
The legal architecture
Massachusetts plumbing and gas work is governed by 248 CMR. The Uniform State Plumbing Code is 248 CMR 10.00; the gas provisions are 248 CMR 5.00, which adopts and amends the National Fuel Gas Code. Licensing sits with the Board of State Examiners of Plumbers and Gas Fitters, while day-to-day enforcement belongs to the local plumbing/gas inspector, usually part of the building department.
Separate the two credentials in your head: a license is a personal qualification (master plumber, journeyman plumber, master gas fitter, journeyman gas fitter, registered apprentice); a permit is issued for one specific job at one specific address. Only a licensed master may apply for the permit and supervise the work. Permits are not transferable and work may not begin before issuance.
Inspection sequence
The classic exam trap is the inspection order. Work that will be concealed must be inspected before it is covered: underground drainage and gas piping before backfill, rough-in before walls close, and final after fixtures and appliances are set and tested. Final inspection failures cluster around the temperature-and-pressure relief discharge, vent terminations, support spacing, and missing or improperly bonded gas piping.
Traps to watch
- Answers that let a journeyman pull the permit or supervise other plumbers.
- Treating an inspection as optional because the inspector is delayed - never cover concealed work without approval.
- Assuming small work is exempt: a water heater replacement is a permitted, inspected job.
- Variances come from the authority having jurisdiction through a formal process, not from the inspector's informal OK.
Worked example
Follow the chain: contract → master files permit → rough-in inspection before covering → pressure/flow tests → final inspection → certificate of occupancy. For a 40-gallon water heater swap in a single-family home, that still means a permit, an inspection, and a compliant T&P discharge terminating safely.