Galvanized & Polybutylene Pipe Replacement Cost
Replacing galvanized water pipe throughout a house is a repipe, and it runs $4,000 – $15,000 depending on material and home size. Swapping a single exposed section costs $400 – $1,500, but partial fixes on galvanized rarely restore pressure: the rust upstream is still there. Polybutylene and lead lines each carry their own pricing and their own disclosure issues.
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| Scope | Installed range | Note |
|---|---|---|
| Full galvanized repipe (PEX) | $4,000 – $12,000 | Whole-house supply replaced, the lasting fix |
| Full galvanized repipe (copper) | $8,000 – $15,000 | Soldered, longer-lived, higher labor |
| Exposed-section swap | $400 – $1,500 | One accessible run in basement or crawl space |
| Single fixture supply replacement | $300 – $900 | Galvanized stub to one sink, tub or hose bib |
| Pipe type | Installed range | Why it matters |
|---|---|---|
| Polybutylene repipe (1978 – 1995 gray pipe) | $4,000 – $12,000 | Insurers and buyers often require replacement |
| Lead service line, private side | $1,500 – $10,000 | Meter-to-house portion you own |
| Lead service line, utility side | Often utility-funded | Many cities run no-charge or shared replacement programs |
| Partial lead replacement | $1,500 – $4,000 | Generally discouraged: can raise lead levels short-term |
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Why galvanized has to come out
Galvanized steel pipe was standard before the 1960s, and the zinc coating that gave it rust resistance has long since worn through on any pipe that old. From the inside, decades of corrosion and mineral scale narrow the bore until a 3/4-inch pipe flows like a straw. That is the source of the whole-house pressure complaint these homes share, and no amount of cleaning the aerators fixes it.
The corrosion also sheds, which is why galvanized homes often run brown or discolored water at the first morning draw. Once a galvanized system has reached this stage, the pipe is consumable, not repairable. Replacement is the only path back to full flow, and on a whole-house basis that is a repipe.
Why partial galvanized fixes disappoint
The tempting move is to replace only the section that is leaking or the run you can reach in the basement. It costs $400 – $1,500 and it stops that leak. What it does not do is restore pressure, because the rust narrowing your pipe is everywhere, not just at the failure point. Tie new copper or PEX into a corroded galvanized line and the new section flows fine while the old pipe upstream still chokes it.
Worse, joining dissimilar metals (new copper to old galvanized) without a dielectric union accelerates corrosion at the connection. Partial swaps make sense only as a stopgap on an accessible leak while you budget a full repipe. If the complaint is low water pressure across the whole house, a section swap will not solve it, and the money is better aimed at the full job.
Polybutylene: the gray pipe with a paper trail
Polybutylene supply pipe, gray or sometimes blue plastic, was installed in millions of homes from 1978 to 1995 before a wave of failures pulled it off the market. It degrades from the inside when exposed to chlorine in municipal water, then fails without warning, often at the fittings. The pipe itself is not always leaking yet, but the risk is the issue.
That risk shows up on paper. Many home insurers will not write or renew a policy on a polybutylene home, and most states require you to disclose it when you sell. A polybutylene repipe runs the same $4,000 – $12,000 as galvanized because it is the same whole-house supply replacement. Homeowners often do it not because of an active leak but to clear an insurance or sale roadblock, which makes it a planning decision rather than an emergency.
Lead service lines: who pays for what
Lead pipe was used for the service line, the run from the water main to the house, in many older cities. Unlike galvanized or polybutylene, lead is a health concern, not a pressure one, and replacement has become a public priority. Ownership splits at the property line or the meter: the utility-side portion is often replaced through municipal programs at no charge to you, while the private side, meter to house, is yours.
The private-side lead replacement runs $1,500 – $10,000 depending on length, depth and whether the yard has hardscape to restore, similar to a main water line replacement. One caution: replacing only your side while the utility side stays lead (a partial replacement) can spike lead levels short-term by disturbing the pipe. Coordinate with your water utility so both halves come out together when possible, and check whether your city offers funding for the private side too.
What the replacement visit looks like
For galvanized or polybutylene, the job is a repipe: the crew runs new PEX or copper to every fixture, leaving the dead pipe in the walls, and restores water each night over a 2 to 4 day job. The same drywall question applies as any repipe, confirm whether your quote returns walls to paint-ready or simply patches the access holes.
For a lead service line, the work is outside: the crew either trenches the run from meter to house or pulls new pipe through with a trenchless machine to spare the yard. Expect a day or two, a permit, and coordination with the water utility for the meter connection. Pressure-testing and a flush close out either job.
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