Whole-House Repiping
Polybutylene pipe replacement
Polybutylene is a gray flexible plastic water pipe installed in many US homes from the late 1970s to the mid 1990s. It can become brittle and split or leak at fittings without warning, and it is no longer made or accepted by plumbing codes. The lasting fix is to replace it, usually with PEX, in a whole-house repipe.
- Independent licensed local plumbers
- The plumber gives you a price before work starts
- Free referral, no obligation
The pipe is usually gray, sometimes blue outdoors or black, about half an inch to an inch across, and often stamped PB2110. Look where pipe is exposed: at the water heater, under sinks, at the main shutoff and in the attic or crawl space. Copper stub-outs at fixtures do not rule it out, since many installations used copper only where it shows.
The reason it matters beyond leaks is paperwork. Some home insurers decline or surcharge homes with polybutylene, and it is a routine finding in home inspections, so it affects buying, selling and coverage as well as the risk of water damage.
When you need polybutylene pipe replacement
- You have found gray plastic supply pipe stamped PB2110
- There has already been one unexplained leak in a wall or ceiling
- An insurer or home inspector has flagged the plumbing
- You are buying or selling a home built from about 1978 to 1995
- You are remodeling and walls are already open
How it is done and the choices involved
- 1
Confirm what you have
The plumber checks exposed pipe and fittings in several places to confirm it is polybutylene and whether the yard service line is made of it too.
- 2
Whole-house repipe
New PEX or copper is run to every fixture through small openings in walls and ceilings, with the old pipe abandoned in place. Water is typically off only during working hours.
- 3
Service line replacement
If the buried line from the meter is polybutylene, it is replaced as well, often by pulling new pipe through or boring a new path.
- 4
Patch and inspection
After the new system passes a pressure test and inspection, wall and ceiling openings are closed. Ask whether drywall repair and painting are included in the quote.
What affects the cost of polybutylene pipe replacement
Prices vary by market and job. The pro gives you a price before starting; these factors drive it.
- Size of the home and number of bathrooms and fixtures
- Slab, crawl space or basement, and whether lines run through the attic
- PEX versus copper
- Whether the yard service line is included
- Drywall patching and paint
- Permit and inspection
Polybutylene Pipe Replacement FAQ
How do I know if I have polybutylene pipes?
Look at exposed water pipe near the water heater, under sinks and at the main shutoff. Polybutylene is flexible, usually gray, and often stamped PB2110. Homes built between roughly 1978 and 1995 are the ones to check. A plumber or home inspector can confirm it.
Do polybutylene pipes have to be replaced?
No law requires it, but the material is known to fail from the inside with little warning, and it cannot be assessed reliably by looking at the outside. Replacement is the only fix that removes the risk, and insurers and buyers often push the decision.
Will homeowners insurance cover a house with polybutylene?
It varies by company and state. Some insurers will not write a new policy on a home with polybutylene, and others exclude or limit water damage from it. Ask your agent directly, and ask what documentation they want after a repipe.
Is PEX the same as polybutylene?
No. Both are flexible plastic, but PEX is cross-linked polyethylene, a different material that is accepted by current plumbing codes and is the most common repipe material today.
Part of whole-house repiping
Polybutylene Pipe Replacement is one job within whole-house repiping. The main page covers the warning signs, the full process and what you can safely do yourself.
Whole-House Repiping by city
Ownership rules, permits and pipe materials differ from city to city. Local guides:
Somewhere else? Browse plumbing conditions in all 50 states.
Need help with polybutylene pipe replacement?
Call (833) 520-4758 to reach an available local pro.