Choose PEX if…
- Cost matters and you want a quicker, less invasive repipe.
- Your pipes run through crawlspaces, exterior walls or other places that freeze.
- Your water is acidic and you want to avoid copper corrosion.
Choose copper if…
- You want the longest expected lifespan on paper.
- You prefer a traditional material and are willing to pay more for it.
- Your plumber, your house and your water all suit it.
Key takeaways
- PEX costs less. One national guide says copper runs 58% to 68% more than PEX for a whole-house repipe.
- Copper is listed as lasting longer. The same guide gives copper 50 to 70 years and PEX 30 to 50.
- PEX handles a freeze better. Copper can crack when the water in it freezes. PEX can expand.
- Water chemistry matters. Highly acidic water can shorten copper's life.
- Repiping is a big job. Many houses do fine with repairs. Get the pipes looked at before you decide.
Side by side
| PEX | Copper | |
|---|---|---|
| Cost basis | Lower. Nationally, Bob Vila (updated 07/23/2025) lists about $0.50 to $2 per linear foot (national average, not a quote). | Higher. Nationally, Bob Vila (updated 07/23/2025) lists about $2 to $8 per linear foot (national average, not a quote). |
| Freeze tolerance | Can expand if the water inside it freezes. | Tends to crack if the water inside it freezes. |
| Installation | Flexible tubing, easier to route and connect. | Rigid; connections use a torch. |
| Lifespan | Bob Vila lists 30 to 50 years. | Bob Vila lists 50 to 70 years. |
| Best for | Cost-conscious repipes; cold spots. | A long expected lifespan; a traditional install. |
Cost
- Nationally, Bob Vila (updated July 23, 2025) says installing copper is on average 58% to 68% more expensive than PEX (national average, not a quote).
- Nationally, Bob Vila (updated July 23, 2025) gives an example of $8,000 to $10,000 to replace the old pipes of a two-bath, 1,500-square-foot home with copper, and roughly $4,000 to $6,000 for PEX (national average, not a quote).
- Nationally, Bob Vila (updated July 23, 2025) lists copper at about $2 to $8 per linear foot and PEX at about $0.50 to $2 (national average, not a quote).
We could read one national guide in full for this page, so there is no second figure to compare. A house with tight access, finished walls or a complicated layout will cost more than the example, and one with open framing will cost less. Your plumber sets the actual price. Ask for it in writing, and for the pipe, fittings, permit and wall repair to be listed.
Lifespan
Bob Vila (updated July 23, 2025) lists copper at 50 to 70 years and PEX at 30 to 50 years, and estimates that under typical municipal-water conditions copper outlasts PEX by about 20 years. These are published ranges for new installs, and real life depends on the water, the install and what the pipes go through. Don't read them as promises.
Freeze damage
Johnson City winters are mild most days, but they do freeze. For the Tri-Cities Airport, NOAA and National Weather Service data for 1991 to 2020 put the typical last freeze around April 16, so a cold snap is not only a January event. Pipes in crawlspaces, exterior walls and unheated garages are the ones at risk.
Bob Vila says one of copper's biggest disadvantages is its tendency to crack if the water in the pipe freezes and expands, and that PEX can expand if the water inside it freezes, which makes it more resistant to freeze damage. "More resistant" is not "freeze-proof," and insulation still matters. See how to prevent frozen pipes and frozen pipes for what to do either way, and burst pipe repair if one has already split.
Installation
PEX is flexible tubing. It bends around corners and can be pulled through walls and floors with fewer joints. Bob Vila calls PEX the easier pipe to install. Copper is rigid, so each corner or branch needs a fitting, and connections use a torch. Both need a licensed plumber for a repipe, and either may need a permit. Ask who pulls it.
A repipe usually means opening walls, ceilings or floors to run new lines. The amount of wall repair is a big part of the cost, and it differs more by house than by pipe material.
Water chemistry, in general terms
Bob Vila says copper's life can be shortened by highly acidic water, and that copper is more vulnerable to corrosion than PEX. On a municipal supply the utility treats the water. On a private well, water can vary a lot from one property to the next. We haven't cited local water-quality data for Johnson City or the surrounding counties, so we can't tell you what your water does to pipe. If you are on a well, test the water and ask the plumber to take the results into account. The EPA advises testing a private well every year; see well pump not working for its testing guidance.
When repiping makes sense
Many houses never need a full repipe. Spot repairs often fix a single leak. A repipe starts to make sense when:
- You have galvanized steel supply lines. They rust from the inside, causing low flow, brown water and repeated leaks. Pinholes tend to come in clusters.
- Leaks keep coming back in different places.
- Pressure has dropped over time because pipes are clogged inside. See low water pressure.
- You are already opening the walls for a remodel.
- A plumber's camera or inspection finds widespread corrosion.
Johnson City has a lot of older housing. The Census Bureau's American Community Survey (2024 1-year estimate, table B25034) shows about 1 in 4 Johnson City homes built before 1960 and nearly half before 1980. Houses that old can still have original plumbing, or a mix of old and new. That doesn't mean yours needs a repipe. It means a look is worthwhile. The homeowner's plumbing guide covers what to check.
What a repipe involves
A whole-house repipe replaces the supply lines that carry water to your fixtures. The plumber plans routes for the new pipe, shuts off the water, and opens access points in walls, ceilings or floors. New lines go in, the old ones are abandoned or removed, and each fixture is reconnected. Then the system is pressure tested and checked for leaks, and the openings are closed.
Expect to be without running water for part of at least one day. Ask how long, and whether the crew can leave you a working tap or toilet overnight. Ask who repairs the drywall and paint, because wall repair is often a separate trade and a separate bill. Some repipes can be done in stages, one part of the house at a time, which may suit a tight budget.
Questions to ask a plumber
- What pipe do I have now, and where is the worst of it?
- Would a repair or a partial repipe do the job, or does the whole house need it?
- Which material do you recommend for my house and my water, and why?
- What exactly is in the quote: pipe, fittings, permit, wall repair and cleanup?
- How long will the water be off, and will the work be done in stages?
- What does the warranty cover on the pipe and on the labor?
- Who pulls the permit, and does the work need an inspection?
Write the answers next to each quote so you can compare like with like.
How to decide
- Find out what you have now. A plumber can tell galvanized, copper, PEX and plastic apart.
- Ask whether a repair would do. A repipe is not the only choice.
- Ask for quotes for both materials, with the same scope: fittings, permit, wall repair.
- Ask about warranty on the pipe and on the labor.
- Think about where the pipe runs. Pipe in a cold crawlspace or exterior wall is the pipe a freeze will test.
Safety
Never work on supply lines with the water on. Shut off the main first. Working with a torch is a fire risk in a wall or crawlspace. Leave a repipe to a licensed plumber.
Where our line fits
We don't set prices or do the work; the plumber sets the price. Any price, fee or schedule is agreed directly between you and the plumber. Use the figures here to judge whether a quote is in a believable range. For other jobs, see what plumbing jobs cost. Your plumber sets the actual price.