If you're repiping a house, the biggest decision after "should I do it?" is the pipe material. Today most whole-house repipes in the U.S. use PEX (cross-linked polyethylene), while copper remains the premium, traditional choice. Both are approved by plumbing codes nationwide and both can serve a home for decades. The right one depends on your budget, your water, your climate and how your house is built.
Here's a side-by-side comparison, followed by the details that matter most. To see real numbers for your home, try the repipe cost calculator and switch between PEX and copper.
| PEX | Copper | |
|---|---|---|
| Installed cost per sq ft of home | $2.70 – $4.00 | $6.50 – $12.00 |
| Expected lifespan | About 40+ years | 50 – 70 years |
| Freeze resistance | Better (it can expand) | Can split when frozen |
| Fittings and wall openings | Fewer | More |
| Install time | Faster | Slower |
| Sunlight (UV) | Must be covered | Not affected |
| Acidic water | Not affected | Can cause pinhole leaks |
| Noise (water hammer) | Quieter | Louder |
| Recyclable scrap value | None | Yes |
Lifespans are from InterNACHI's life expectancy chart. Costs are our 2026 national averages; see how we estimate.
Cost: PEX is usually about half the price
PEX pipe is cheaper per foot, but the bigger saving is labor. It comes in long flexible coils, so plumbers can snake runs through walls and ceilings with fewer joints and smaller openings. Copper is rigid, so every turn needs a fitting that has to be soldered, and that takes more time and more holes in your drywall.
| Home size | PEX | Copper | Typical difference |
|---|---|---|---|
| 1,500 sq ft | $4,050 – $6,000 | $9,750 – $18,000 | $5,700 – $12,000 |
| 2,000 sq ft | $5,400 – $8,000 | $13,000 – $24,000 | $7,600 – $16,000 |
| 3,000 sq ft | $8,100 – $12,000 | $19,500 – $36,000 | $11,400 – $24,000 |
These figures cover pipe and labor only. Drywall patching, permits, extra bathrooms, slab foundations and your location all add to the total. The calculator includes all of these.
Compare PEX and copper prices for your home
Lifespan and reliability
Copper has the longer track record. It has been used in homes since the 1960s and commonly lasts 50 to 70 years. PEX has been widely used in U.S. homes since the 1990s and is expected to last about 40 years or more when it's installed correctly. In practice, both will likely outlast your mortgage.
The bigger question is what can shorten their life:
- Copper can develop pinhole leaks from acidic water, high water velocity or stray electrical current. Once pinholes start, they tend to repeat.
- PEX breaks down in direct sunlight, so it must be kept out of UV light. It can also be damaged by rodents in attics and crawl spaces, and some fittings can corrode in very aggressive water.
Water quality and taste
PEX sold for drinking water in the U.S. is certified to NSF/ANSI standards. Some people notice a slight plastic taste or smell in new PEX that fades after the lines are flushed. Copper can give water a metallic taste when it corrodes. Neither material contains lead, but older homes may still have lead solder or lead service lines. The EPA explains how to check and reduce lead exposure. A repipe is a good time to replace any lead pieces in your system.
Freezing climates
PEX can expand when water freezes inside it and often returns to shape without bursting. Copper is more likely to split. That doesn't make PEX freeze-proof (fittings can still fail), but it's a real advantage in cold climates, crawl spaces and exterior walls.
Not sure which pipe is right for your home?
A local repipe plumber can look at your house and water and give you an exact quote for PEX and copper.
- Exact price for your home
- Local providers
- No obligation to hire
Calls connect to a partner network of independent local providers. HouseCostCalc may be paid when you call. There is no obligation to hire.
When copper may be the better choice
- Pipes will be exposed to sunlight or very high heat, like near some water heaters or outdoors.
- Your local code, condo association or HOA requires metal pipe in certain locations.
- You're restoring an older or high-end home and want metal throughout.
- Your water is not acidic (ask your utility for its water quality report, or test it).
- You have rodents in the attic or crawl space that you can't fully control.
When PEX is the better choice
- You want the lowest cost and the fastest job with the least drywall damage.
- You live in a cold climate where pipes may freeze.
- Your water is acidic or very hard, which can corrode copper over time.
- You're repiping a home on a slab and want to reroute lines through the attic. See signs your house needs repiping for more on slab homes.
PEX-A vs PEX-B vs PEX-C
PEX is made in three ways. PEX-A is the most flexible and uses expansion fittings, which leave a wide opening for water to flow and can repair kinks with heat. PEX-B is stiffer and slightly cheaper, and uses crimp or clamp fittings. PEX-C is the least common for whole-house work. All three are code-approved; ask your plumber which they use and why.
What about CPVC?
CPVC is a rigid plastic pipe that costs between PEX and copper. It's less common for whole-house repipes today because it can become brittle with age and needs more glued fittings. If your home already has CPVC that's cracking, PEX is the usual replacement.
Our recommendation
For most homeowners, PEX is the better value: it costs about half as much, installs faster with less damage to your walls, and handles freezing and acidic water better. Choose copper if it's required where you live, if pipes will be exposed to sunlight, or if you prefer metal and the extra cost fits your budget. Whichever you pick, the quality of the installation matters more than the material.
Already dealing with a leak? Read what to do after water damage before you start comparing pipe.
Frequently asked questions
Is PEX safe for drinking water?
Yes. PEX sold for drinking water in the U.S. is certified to NSF/ANSI standards. A plastic taste in new pipe usually fades after flushing.
Do rodents chew PEX pipe?
It can happen, though it's uncommon. If you have a rodent problem in the attic or crawl space, deal with it before or during the repipe, or ask about copper in those areas.
Does PEX lower home value?
No. PEX is standard in new construction across the U.S. A recent repipe with any approved material is a selling point compared with old galvanized or polybutylene pipe.
Can you mix PEX and copper?
Yes. Plumbers often connect PEX to existing copper with transition fittings, for example at the water heater or a fixture.
Which is quieter, PEX or copper?
PEX. Its flexibility absorbs water hammer, so PEX systems are usually quieter than copper.
Sources
- InterNACHI: Standard Estimated Life Expectancy Chart for Homes
- U.S. EPA: Basic Information about Lead in Drinking Water
Costs are 2026 national estimates for planning only. Your price depends on your home, your area and the contractor. See how we estimate.