9 Signs Your House Needs Repiping

Most homes never need a full repipe. But if your house is more than 40 to 50 years old, or it was plumbed with galvanized steel or polybutylene, the water lines may be near the end of their useful life. Patching one leak at a time gets expensive fast, and every hidden leak is a chance for water damage and mold.

This guide covers the nine warning signs plumbers look for, how to identify the pipes in your home in about ten minutes, how long each pipe material lasts, and what a whole-house repipe costs in 2026. If you already know your home's size, you can jump straight to the repipe cost calculator.

First, find out what pipes you have

You can usually identify your supply pipes where they're exposed: near the water heater, under kitchen and bathroom sinks, in an unfinished basement or crawl space, or where the main line enters the house.

Scratch a copper-looking pipe gently with a coin. If it shows a shiny copper color, it's copper. If it's silver and soft, it could be lead, which was used for some older service lines. The EPA notes that homes built before 1986 are more likely to have lead pipes, fixtures or solder. If you suspect lead, contact your water utility and have your water tested.

How long do water pipes last?

According to InterNACHI's life expectancy chart, copper water lines typically last 50 to 70 years and PEX about 40 years or more. Galvanized steel usually lasts 40 to 60 years before rust buildup and leaks set in. Polybutylene doesn't have a dependable lifespan at all, because it can fail at any age.

The 9 signs your house needs repiping

1. Leaks keep coming back

One leak is a repair. Two or three in a year, in different places, means the pipe material itself is failing. Each repair costs a few hundred dollars plus drywall patching, and the next leak is usually not far behind. Watch for water stains on ceilings and walls, bubbling paint, warped flooring and a water bill that rises for no clear reason.

2. Brown, yellow or rusty water

Discolored water, especially first thing in the morning or after a vacation, often means galvanized pipes are rusting from the inside. Run both hot and cold taps. If only the hot water is discolored, your water heater is the more likely cause and may simply need flushing or replacing.

3. Low water pressure throughout the house

Low pressure at a single faucet is usually a clogged aerator or a failing cartridge. Low pressure everywhere, especially when two fixtures run at once, can mean rust and mineral scale have narrowed the inside of old galvanized pipes. A plumber can confirm it with a pressure gauge at a hose bib.

4. You have polybutylene pipes

Polybutylene was installed in millions of homes from the late 1970s to the mid-1990s. Chlorine and other oxidants in water can make it brittle from the inside, so it can crack without warning. Many insurers charge more for, or refuse to write policies on, homes that still have it, and buyers' inspectors almost always flag it.

5. You have galvanized steel pipes

Galvanized steel was the standard before the 1960s. The zinc coating wears off over time and the steel rusts from the inside, which causes the pressure loss and discolored water above. If your home still has galvanized supply lines, it's usually a matter of when, not whether, they need replacing.

6. Pipes are visibly corroded

Look at exposed pipes in the basement, crawl space and under sinks. Green crust on copper, orange rust, flaking, dimpling or white mineral buildup around joints are early warnings. Pinhole leaks in copper are often caused by aggressive (acidic) water, and they tend to repeat.

7. Banging, rattling or whistling pipes

Noisy pipes can be loose straps or water hammer, which are cheap fixes. But in an older system it can also mean pipes have shifted over the years and joints are weakening.

8. Water tastes or smells metallic

A metallic taste or smell can come from corroding pipes. If your home was built before 1986, don't ignore it. Have your water tested for lead and follow the EPA's guidance on reducing lead exposure.

9. You're remodeling anyway

If walls and floors are already open for a kitchen or bathroom remodel, replacing the pipes at the same time saves much of the cost of opening and patching walls later. It's also the cheapest time to move fixtures or add a shutoff manifold.

How much does it cost to repipe a house?

Most whole-house repipes cost $2.70 to $4.00 per square foot of living space with PEX and $6.50 to $12.00 per square foot with copper, before drywall patching and permits. Here's what that looks like for common home sizes with PEX:

Add roughly $1.60 to $3.00 per square foot if the job includes drywall patching and paint, and $100 to $800 for permits and inspection. Homes on a slab, two-story homes and homes with more than two bathrooms cost more. Prices also vary by state, and the calculator adjusts for your ZIP code. See how we estimate for the full method.

Estimate your repipe cost by ZIP code

Repipe or repair?

A spot repair makes sense when the rest of the system is in good shape and the leak has an obvious cause, like a nail through a pipe or a failed fitting. A repipe makes sense when the pipe material itself is the problem: repeat leaks, polybutylene, or corroded galvanized steel.

• Repair if: the pipes are copper or PEX, it's the first leak in years, and the water looks and tastes normal.
• Repipe if: you've had several leaks, you have polybutylene or galvanized pipe, or your insurer is asking about your plumbing.
• Partial repipe if: one area (like a slab run or a single bathroom) keeps failing but the rest is sound.

Ask the plumber to show you a cut section of your old pipe so you can see the inside for yourself. Heavy scale or pitting is hard to argue with.

Don't wait on hidden leaks

A slow leak inside a wall can soak insulation and framing for weeks before you see it. The EPA advises drying water-damaged materials within 24 to 48 hours to prevent mold. If you've found a leak that has been running for a while, read what to do after water damage and check the mold remediation cost calculator before the walls are closed up.

What happens during a repipe

1. Inspection and quote. The plumber checks the pipe type, the main shutoff, the water heater and access from the attic or crawl space.
2. Permit. Most cities require a plumbing permit for a repipe.
3. Protecting the home. Floors and furniture are covered, and small openings are cut in drywall where needed.
4. New lines are run, usually from a new main shutoff to each fixture, often with a PEX manifold.
5. Pressure test and inspection. The new system is tested before walls are closed.
6. Drywall patching, either by the plumber's crew or a separate drywall contractor.

Choosing between PEX and copper? Read our full comparison: PEX vs copper pipe.

Frequently asked questions

Sources

• InterNACHI: Standard Estimated Life Expectancy Chart for Homes
• U.S. EPA: Basic Information about Lead in Drinking Water
• U.S. EPA: A Brief Guide to Mold, Moisture and Your Home

Costs are 2026 national estimates for planning only. Your price depends on your home, your area and the contractor. See how we estimate.