PEX vs Copper for a Repipe: How to Choose
Both materials are used for supply plumbing. The right one depends on your house, your budget, local code and your plumber’s experience.
Side by side
| PEX | Copper | |
|---|---|---|
| Flexibility | Flexible tubing, fewer joints on long runs | Rigid, needs fittings at turns |
| Corrosion | Does not corrode like metal | Can corrode over time depending on water and conditions |
| Installation | Often simpler to run through walls | Requires soldering or fittings |
| Concerns | Check code approval, sunlight exposure and fitting types | Cost and corrosion history |
| Cost | Ask for quotes on both | Ask for quotes on both |
We do not give price comparisons here because they depend on the house and the market. Request both in writing.
Questions to ask your plumber
- Which materials do you install and why?
- Which fittings are used and what is the warranty?
- Does the material meet California code for this use?
- Does the choice affect my permit or insurer?
- How will the new lines run, and what walls must open?
Where this fits
This applies when you are replacing the supply system. See whole-house repipe and slab leak reroute. Check permit requirements in Pomona plumbing permits.
Frequently asked questions
Is PEX allowed in California?
California code allows PEX for potable water in many applications, but confirm with your plumber and the City for your project.
Which is better for a slab house?
Many repipes run new lines through walls or the attic rather than the slab. See slab leak reroute.
Does copper or PEX cost more?
It depends on the job. Get both quoted.
Will my insurer care?
Ask your insurer before the work.
Keep reading
Need slab leak repair Pomona homeowners can book? See our slab leak repair Pomona page for how we work, or call (909) 415-2610.
Water running, or a warm spot on the floor?
Shut off the main if water is visible, then call. A Pomona plumber will tell you what to do next.
Call (909) 415-2610
