PEX vs. Copper Pipe
PEX is flexible plastic tubing that costs less and installs faster with fewer joints, which makes it the most common choice for repiping today. Copper is rigid metal pipe with a long track record, it handles heat and UV better and can last 50 years or more, but it costs more and takes longer to install.
Last reviewed September 2026
PEX vs. Copper: side by side
| Factor | PEX | Copper |
|---|---|---|
| Material cost | Low | High, and prices swing with the metal market |
| Repipe a house | About $4,000–$15,000 | About $8,000–$20,000 |
| Installation | Flexible, fewer fittings, faster | Rigid, soldered joints, slower |
| Freeze resistance | Can expand somewhat, less likely to burst | More likely to burst when frozen |
| Lifespan | Expected 40–50 years | 50–70 years or more |
| Sunlight | Must be protected from UV | Not affected |
| Rodents | Can be chewed | Not affected |
| Corrosion | Does not corrode | Can pit in aggressive water |
Which one should you choose?
Choose pex if
- You are repiping on a budget
- Pipes run through tight walls and ceilings
- Your area has freezing winters
- Your water is corrosive to copper
Choose copper if
- Pipes are exposed to sunlight or high heat
- You want the longest proven lifespan
- Local code or your preference favors metal
- You are repairing part of an existing copper system
Cost comparison
| Option | Typical cost |
|---|---|
| Repipe with PEX | $4,000–$15,000 |
| Repipe with copper | $8,000–$20,000 |
| Replace a section of pipe | $150–$600 |
| Plumber per hour | $75–$150 |
Ranges are typical US prices compiled by FixHomeCost. Prices vary by region, home and contractor, so compare 2–3 local quotes.
Common questions
Is PEX as good as copper?
For most home water supply lines, PEX performs well and is now the most common choice. Copper still has advantages for exposed runs and high-heat locations.
Does PEX affect water taste?
Some people notice a slight taste or smell in new PEX that fades after flushing. Choose pipe certified to NSF/ANSI 61 for drinking water.
Can PEX and copper be connected?
Yes, with proper transition fittings. Many repairs connect new PEX to existing copper.
Which is better in cold climates?
PEX is more forgiving if water freezes, but no pipe is freeze-proof. Insulate pipes in unheated spaces either way.