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Plumbing · Lexington, MA

Plumbing in Lexington, Massachusetts

Compare contractors serving Lexington, Middlesex County — call them directly, or send one request and let the ones who want the job come to you.

30 contractors serving Lexington — including 2 based in town.

Contractors serving Lexington

Claimed listings within 5 miles come first, then the rest by rating, then distance. Google ratings as of October 2026. How we list and rank contractors

Plumbing in Lexington — what to know

Rebates & incentives

Lexington is in Eversource territory, so homeowners qualify for the full Mass Save program. The plumbing-relevant rebate is for heat-pump water heaters: as of recent rebate cycles, replacing an electric tank with an HPWH has typically returned around $750, with a free Mass Save Home Energy Assessment as the unlock.

In Lexington's oldest Colonial-era homes near the center, the lead and galvanized service-line angle is worth checking. Some Massachusetts water departments run lead service-line replacement programs, so homeowners with original supply should have a plumber identify the material and ask the Lexington water department before paying out of pocket to replace a lead or galvanized line.

Permits in Lexington

Massachusetts requires a licensed plumber and a plumbing permit for water heaters, repiping, drain and sewer lines, and rough-ins, filed through the Lexington building/inspections department. Gas work needs a separately licensed gas fitter and a gas permit. Historic homes near the Battle Green and in Lexington's historic districts need approval for exterior changes, and the town's active teardown-rebuild market means many full plumbing rough-ins. Rough and final inspections apply. Plumbers serving the town fold the permit workflow into the project.

A plumbing or gas permit in Lexington is filed with the town’s plumbing and gas inspector; see the Lexington Building Department’s contact, portal and who pulls the permit on permits.llc.

Typical project cost

Lexington sits in the inner-Boston-metro cost band on the higher side, given larger homes and an affluent renovation market. A standard tank water heater typically runs $1,900–$3,500 installed; a heat-pump water heater $2,700–$4,900 before the Mass Save rebate; a tankless gas unit $4,500–$7,500. Large new and rebuilt homes with several baths sometimes run two units or high-capacity tankless. Full rough-ins for additions and gut renovations push higher, and historic-home retrofits add labor for tight access.

About Lexington homes

Lexington is an affluent Middlesex County town northwest of Boston, about 34,221 residents across roughly 12,727 housing units. The median home is around 63 years old, blending historic Colonial-era homes near Lexington Center and the Battle Green with extensive mid-century subdivisions and a steady stream of teardown-rebuilds producing large new homes throughout town.

For plumbing, the mix is distinctive: historic homes need careful retrofit work through plaster and old framing, mid-century homes carry aging copper, and new builds bring high fixture counts and multiple bathrooms. Water-heater replacements, repiping during renovations, and rough-ins for additions are common.

Common questions — Plumbing in Lexington

Does Mass Save cover a heat-pump water heater in Lexington?
Yes. Lexington is Eversource territory, so the Mass Save heat-pump water heater rebate applies — typically around $750 in recent cycles, unlocked by a free Home Energy Assessment.
I own a historic home near Lexington Center. Can I still update the plumbing?
Yes. Interior plumbing work generally proceeds without historic-district review, though it takes care to route new lines through plaster and old framing. Exterior changes may need approval from Lexington's historic district commission.
We're doing a teardown-rebuild. Does the plumbing need full permitting?
Yes. A new build or gut renovation requires full plumbing rough-in work by a licensed plumber under a plumbing permit, plus a gas permit and licensed gas fitter for any gas piping. Inspections follow rough and final stages.
Do I need a permit to replace my water heater in Lexington?
Yes. It requires a plumbing permit and a licensed plumber through the Lexington building department; a gas unit also needs a licensed gas fitter and gas permit. Reputable plumbers handle the paperwork and inspections.
Could my oldest Lexington home have a lead service line?
Possibly for the Colonial-era homes near the center. Have a plumber identify the service-line material, and check with the Lexington water department about any lead service-line replacement program before paying yourself.

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