Galvanized pipe replacement cost: PEX, copper, partial

Do galvanized pipes have to be replaced?

Galvanized steel supply pipe is the finding: it corrodes from the inside, a failure that's invisible from outside the pipe, and lead can accumulate on the corroded surface. A licensed plumber sets the real number once they see wall access and pipe condition; a whole-house repipe with PEX runs $1,500 to $8,000 or more (CostHelper).

No primary source fetched for this page sets a date by which galvanized supply pipe must be replaced. Two things drive the decision, lead and age. On lead, the U.S. Environmental Protection Agency (EPA) says: "Lead particles can attach to the surface of galvanized pipes. Over time, the particles can enter your drinking water, causing elevated lead levels" (EPA, "Sources of Lead in Drinking Water,"). International Association of Certified Home Inspectors (InterNACHI) puts galvanized pipe's useful life at "approximately 20 to 30 years," and notes that internal corrosion "is not visible in piping and is difficult to detect" from the outside (InterNACHI). Age plus that lead-accumulation risk is why a plumber, not the report, makes the replace-or-monitor call.

How expensive is it to replace galvanized pipes?

Costs span from a single-fixture partial repair to a full-house copper repipe, and the gap is almost entirely scope: how many fixtures, whether it's the whole house or one section, and whether drywall repair is bundled in. A repipe (replacing all of a home's galvanized supply lines) is one of the findings Kept marks as needing a professional quote rather than a formula price, because the true scope only shows once a plumber sees wall access and pipe condition. The table below is what named sources report for that scope range, not one number.

One Call Plumbing's three whole-house rows above are one Upstate South Carolina company's own bathroom-count segmentation, not a national range. No fetched source publishes a per-section galvanized figure specific to partial galvanized runs; the HomeAdvisor row above is for pipe replacement generally. A plumber's on-site quote is the only way to get a number for your specific section.

What does it cost to replace galvanized pipes with PEX?

PEX is the lower-cost material in every source below. One Southern California contractor prices it at $1.50 to $4.00 per linear foot; priced as a job it depends on fixture count and whether drywall repair is included, which is why the whole-house figures spread so wide.

What does it cost to replace galvanized pipes with copper?

Copper costs more than PEX in every source that quotes both, for the same job. That Southern California contractor prices copper at $3.00 to $8.00 per linear foot; a full house in copper starts higher than the equivalent PEX job in every paired example below.

Who evaluates galvanized pipe, and what do they check?

A licensed plumber, not the inspector, sets the actual scope. Internal corrosion doesn't show from outside the pipe, so the plumber's job is to check water pressure and flow at multiple fixtures, and in many cases run a camera through accessible sections, before naming a number. Ask specifically whether the quote is for a full repipe or a partial section, which material they're pricing (PEX or copper), and whether drywall patching and paint are included in the figure they give you.

Every source in the tables above prices those two variables differently, which is exactly why quotes for the same house can differ by thousands of dollars. See how to get repair estimates during the inspection period for the fastest ways to get that plumber's number inside your window.

If your report also flagged polybutylene supply line anywhere in the house, that's a separate material with its own replacement question: see polybutylene pipes on your inspection report.

What do I ask the seller for?

Name the scope, the trade, and a sourced figure, not a round number. For example: "Repipe the house's galvanized supply lines with PEX, drywall patch and paint included: $6,500, based on CostHelper's whole-house PEX range for a comparable home, pending a plumber's on-site quote." Once you have a figure, what to ask for after a home inspection covers how to size the request, and the buyer repair request letter template has the wording to send it.

A repipe alone is rarely a walk-away: it's a large, but knowable, cost once a plumber quotes it. It becomes a bigger conversation only if the seller won't move on a confirmed number, which when to walk away after a home inspection covers.

For the findings on your report that are formula-priced instead of quote-only, how Kept prices a repair explains the method behind that number.

Your report likely has more than this one finding on it, and Kept prices the rest of the list so your time goes to the lines, like this one, that need a professional's figure. Get your repair-cost memo, usually under 4 hours.

Sources

• EPA, "Sources of Lead in Drinking Water (Text Only)" (as of 2026-09-19)
• InterNACHI, "Plumbing in Older Homes" (as of 2026-09-19)
• HomeAdvisor, "How Much Does It Cost to Repipe a House?" (updated June 17, 2026, as of 2026-09-19)
• One Call Plumbing, "Galvanized Pipe Replacement Cost and Upgrade Guide" (as of 2026-09-19)
• AE Heating and Cooling, "How Much Does It Cost to Repair or Replace Plumbing Pipes?" (as of 2026-09-19)
• We Do Repipes, "Galvanized Pipe Replacement Houston" (as of 2026-09-19)
• CostHelper, "2026 Cost of Replacing Galvanized Pipes" (as of 2026-09-19)
• Creative Repipe, "How Much Does It Cost to Replace Galvanized Pipes?" (as of 2026-09-19)