The typical polybutylene pipe replacement cost for swapping the old gray pipe in a 1,800 sq ft, 2-bathroom home for PEX is about $6,400 to $11,800. Expect the job to run 2 to 3 days. What drives the bill most is how big the house is, how many bathrooms it has, and what the plumber has to work around under the floor.
Spotting polybutylene in your house
Between 1978 and 1995, builders installed this gray plastic water pipe in roughly 10 million homes. The code PB2110 is stamped along the side of the pipe, and finding that code tells you for sure.
Check beneath the sinks, next to the water heater, along the underside of a basement ceiling, and wherever the water line enters at the meter, says InterNACHI.
Why polybutylene replacement makes sense?
Certain disinfectants in ordinary tap water react with this plastic and make it flake apart, and no part of the system is safe from it. Because the breakdown begins inside the pipe, a leak can show up without any warning.
There's no law forcing removal. Still, plumbers often advise replacing it, since a leak you can't see can do a lot of damage before you find it.
Three materials take its place. PEX is flexible plastic pipe, colored red for hot lines and blue for cold. CPVC is a hard plastic pipe in cream or tan, and copper is soldered metal pipe.
Polybutylene repipe cost by house size
These prices assume a single-floor home on a crawl space, piped in PEX, at average US plumber rates. A crawl space is the shallow open area beneath a raised floor that leaves room for the plumber to get at the pipes.
| Baths | Square feet | Cost | Days |
|---|---|---|---|
| 1 | 1,200 | roughly $4,100–$7,700 | 2–3 |
| 2 | 1,800 | roughly $6,400–$11,800 | 2–3 |
| 3 | 2,400 | roughly $7,500–$14,400 | 3–4 |
| 4 or more | 3,200 | roughly $10,600–$21,200 | 4–5 |
Bedroom count doesn't matter here. Repipes are priced off bathrooms and square footage, and a 3-bedroom home typically has 2 bathrooms, which puts it at $6,400 to $11,800 for 1,800 sq ft.
The material you pick and the home's layout also move the number. Each row below takes the same two-bathroom, 1,800-square-foot home as its baseline and alters just one detail.
| Swap | Cost | Days |
|---|---|---|
| PEX, crawl space, 1 floor | roughly $6,400–$11,800 | 2–3 |
| CPVC instead of PEX | roughly $7,400–$12,800 | 2–3 |
| Copper instead of PEX | roughly $9,400–$18,800 | 3–5 |
| Slab instead of crawl space | roughly $8,300–$16,300 | 2–3 |
| 2 floors instead of 1 | roughly $7,000–$13,200 | 2–4 |
A slab is a concrete floor poured directly on the ground, with pipes running beneath or inside it, which makes reaching them cost more.
Plumber wages vary from state to state, and that moves the bill. Take that same PEX repipe on a 1,800 sq ft, 2-bath home: Florida runs roughly $5,400 to $9,900, Texas about $5,700 to $10,500, California near $7,000 to $13,000, and Washington around $7,400 to $13,700.
One national guide puts the full job at $1,500 to $15,000, with small 2-bed, 1-bath PEX jobs starting near $1,500 to $2,500 and large 4-bed, 3-bath jobs climbing to $6,000 to $8,000 or beyond, per HomeGuide. Treat these as estimates. Once a repipe company looks at your house, it will give you a firm price.
The polybutylene pipe lawsuit
Polybutylene ended up in class-action lawsuits, where large groups of homeowners brought one case together. In the end, those suits handed homeowners roughly $1 billion combined.
Do polybutylene pipes affect insurance?
Most insurers won't cover the cost of replacement. They see the pipe as a known defect that belongs to the homeowner, as HomeGuide explains.
A few go further and may threaten to cancel a policy unless the pipes are replaced, says Angi. Replacing the pipe can then be about holding on to your coverage, not just about avoiding leaks.
How the estimate is built
The estimate averages a price based on your home's square footage with the typical price for its number of bathrooms, then folds in the added cost of copper or CPVC if you pick it.
Labor makes up roughly 70 percent of the total, so that portion is adjusted by your state's plumber wage compared with the US average. Slab and second-floor extras are added next, and the final figure is rounded to the nearest hundred dollars.
Polybutylene at a glance
- Used: 1978 to 1995
- Where you'll see it: Under sinks, beside the water heater, across basement ceilings, and at the water meter.
- How it fails: Disinfectants in tap water attack the plastic, so small cracks grow from the inside out.
- What to do: Replace it.
Details from nachi.org.
Questions people ask
Is it possible to sell a house that has these pipes?
Yes. The North Carolina Real Estate Commission holds that polybutylene pipes by themselves are not a material fact, so they aren't on their own a serious defect you're required to disclose. That said, the pipes may still reduce what buyers offer or slow the sale.
Is it expensive to replace polybutylene pipes?
Every house is different. A compact one-bath place of 1,200 square feet done in PEX runs roughly $4,100–$7,700, whereas a two-story, 2,400-square-foot home with three baths can reach about $8,100–$16,100 over 3–5 days of work.
Should I replace polybutylene plumbing?
It's safest to assume the pipe will fail eventually, because the damage builds up out of sight. PEX keeps costs lowest; going with copper on a two-bath, 2,000-square-foot house lifts the range from about $6,800–$12,500 to about $9,800–$19,500.