Narrow Way Plumbing & Heating

Massachusetts requires a licensed plumber and a plumbing permit for most work beyond simple fixture swaps, and any gas piping needs a separately licensed gas fitter. In Boston, permits and inspections run through the Inspectional Services Department (ISD). Exterior or structural changes in historic districts — Back Bay, Beacon Hill, Bay Village — can trigger Boston Landmarks Commission review, though interior repiping usually does not. For lead service-line work, the Boston Water and Sewer Commission coordinates the public-side portion. Licensed plumbers typically pull the permit and schedule the required inspection as part of the job.

Plumbing costs in Boston run high relative to the rest of the state — building density, parking, and tight access in triple-deckers and brownstones all add labor. A standard tank water-heater replacement typically runs $1,800–$3,200; a heat-pump water heater $2,800–$4,500 before rebate; a tankless conversion $4,500–$7,500. Whole-home repiping of an older multi-family can range $8,000–$20,000+ depending on floors and wall access. Lead service-line replacement and cast-iron stack work add cost where excavation or coordination with the water commission is involved.

Massachusetts requires a written contract and a Home Improvement Contractor registration for most residential plumbing work; ask for the registration number and check it before paying a deposit.

More on permits, costs, rebates and common questions, plus every other plumbing contractor serving the town, on the Plumbing in Boston page.