Which pipe materials need to be replaced?

Galvanized steel (common before the 1960s) rusts from the inside out, choking pressure and shedding rust into the water. Polybutylene (gray plastic, roughly 1978–1995) fails suddenly and is effectively uninsurable in many markets. Lead is a health hazard — replace on discovery. With these, the question is when, not if.

What are the warning signs a house needs repiping?

Repeated pinhole leaks in copper across different parts of the house, water pressure that has steadily worsened, discolored or metallic-tasting water when a tap first opens, and any in-wall or ceiling leak on old galvanized or polybutylene. One leak is bad luck; a cluster is a pattern.

What does repiping a house cost in 2026?

Small home or single bath: $4,000–$8,000. Typical single-family home with 2–3 baths: $8,000–$16,000. Larger or multi-story home: $15,000–$30,000+. Lead service-line replacement from the main is often a separate $2,000–$8,000, sometimes utility-subsidized. PEX usually runs lower than copper; much of the cost is drywall repair, not pipe.

When should you repipe a house?

Q: Which pipes are fine to leave alone?

Copper lasts 50–70+ years, PEX 40–50+ years, and CPVC 50+ years when properly installed. A single leak at a fitting or one isolated pinhole in otherwise healthy copper is a repair, not a repipe. Age alone isn't a reason to open walls — the material and its failure pattern are.

Q: Is it worth repiping before a pipe bursts?

Usually yes, on known-bad materials. A supply line that lets go inside a finished wall can run for hours, ruining drywall, flooring, insulation, and cabinets and seeding mold that costs far more than the pipe. Repiping proactively lets you control the timing, the mess, and the budget.

Repiping — replacing the water supply lines running through your walls — is one of the biggest plumbing decisions a homeowner faces, and it's rarely a choice you get to make on your own schedule. Old pipe fails quietly for years, then all at once. Whether you should repipe now or keep patching comes down to three things: what the pipes are made of, how old they are, and whether they've started to leak. Some materials are on a countdown the day they go in. Here's how to tell where yours stand.

The pipe materials that force the decision

Unlike most home systems, some plumbing needs replacing because of what it is, not just how worn it looks:

Galvanized steel (common before the 1960s): rusts from the inside out, choking water pressure and shedding rust into your water. If your house predates 1970 and still has original supply lines, assume galvanized near the end of its life.
Polybutylene (gray plastic, roughly 1978–1995): prone to sudden, unpredictable failure and effectively uninsurable in many markets. Most plumbers recommend proactive replacement regardless of current condition.
Lead (very old homes, and some service lines): a health hazard, not just a durability one — replace on discovery.

If your home has any of these, age and appearance matter less than the material itself. The question shifts from "if" to "when," and sooner is cheaper than after a flood.

When you can keep the pipes you have

Modern materials in good condition don't need replacing on a timer:

Copper: 50–70+ years. Sound copper with no pinhole leaks is fine to leave alone.
PEX (flexible plastic, common since the 2000s): 40–50+ years and still early in its service life in most homes.
CPVC: 50+ years when properly installed.

A single leak at a fitting or one isolated pinhole in otherwise healthy copper is a repair, not a repipe. Age alone isn't a reason to tear open walls — the material and its failure pattern are.

The warning signs it's time

Repipe, don't patch, when the failures start clustering:

Repeated pinhole leaks in copper across different parts of the house — one is bad luck, several is a pattern.
Falling water pressure that's gotten steadily worse, especially with galvanized pipe rusting closed.
Discolored, rusty, or metallic-tasting water when a tap first opens.
Any leak inside a wall or ceiling on old galvanized or polybutylene — the next one you can't see coming.

The real risk is the leak you don't see

The most expensive plumbing problem isn't the repipe — it's the failure you find after it floods a wall. A supply line that lets go inside finished walls or above a ceiling can run for hours, ruining drywall, flooring, insulation, and cabinets, and seeding mold that costs far more than the pipe. That's why proactive repiping of known-bad materials almost always beats waiting: you control the timing, the mess, and the budget. It's the same calculus as replacing an aging water heater or sewer lateral before it fails — the planned job costs a fraction of the emergency.

What a repipe costs in 2026

Repiping is a whole-house project, priced by home size, number of bathrooms, pipe material, and how much wall has to be opened and patched:

Small home / single bath: $4,000–$8,000.
Typical single-family home (2–3 baths): $8,000–$16,000.
Larger or multi-story home: $15,000–$30,000+.
Lead service-line replacement (from the main): often a separate $2,000–$8,000, sometimes utility-subsidized.

PEX repipes usually run lower than copper for the same house because the material and labor are cheaper. Much of the cost is the drywall repair afterward, not the pipe itself. See our methodology for how we build these bands.

The bottom line

Repipe when the material demands it — galvanized past its life, polybutylene at all, lead on discovery — or when leaks in modern pipe start clustering instead of showing up once. Leave sound copper, PEX, and CPVC alone; age by itself isn't a reason to open walls. The whole point of doing it proactively is to trade an unpredictable flood for a planned, budgeted project. Knowing the age of your home and its systems is what lets you plan the repipe before a burst line forces the timing. If you're mapping out which aging systems to tackle first, our guide to whether your electrical panel needs replacing covers another big-ticket system on the same clock.