PEX vs Copper Repipe: Which Is Better for Older Homes?
If you’re planning a whole-house repipe, one of the most important decisions is material selection.
Today, most repipes use either PEX piping or copper piping.
Both are proven. Both are widely used. But they perform differently depending on the home and environment.
For a full overview of repiping options, review the complete guide here:
The Complete Guide To Repiping Older Homes
What Is PEX Piping?
PEX (cross-linked polyethylene) is a flexible plastic tubing designed for residential water supply systems.
Benefits of PEX:
Flexible and easier to route
Resistant to scale buildup
Corrosion resistant
Generally more cost-effective
Faster installation
Because it is flexible, PEX often requires fewer wall access points.
What Is Copper Piping?
Copper piping has been used in residential plumbing for decades.
Benefits of copper:
Long history of use
Strong and rigid
Heat resistant
Familiar to inspectors and buyers
However, copper can be affected by acidic water and may require more wall access during installation.
Which Material Lasts Longer?
Both materials are designed for long-term use.
Lifespan depends on:
Water chemistry
Water pressure
Installation quality
Environmental factors
In areas with acidic water, copper may experience wall thinning over time.
In areas with hard water, both materials perform well, but PEX resists mineral scale internally.
Learn more about environmental factors here:
Why Do Pipes Corrode Faster In Certain Climates?
Cost Comparison: PEX vs Copper
PEX is typically more affordable due to:
Lower material cost
Reduced labor time
Fewer fittings required
Copper generally carries higher material and installation costs.
For broader pricing factors, see:
How Much Does It Cost to Repipe a House? Complete Pricing Guide
Which Is Better for Older Homes?
There is no universal answer.
PEX may be advantageous in:
Homes with limited access
Slab foundations
Budget-sensitive projects
Copper may be preferred when:
Matching existing copper systems
Specific local codes require it
Homeowners prefer traditional materials
The best choice depends on the structure and long-term goals of the homeowner.
Frequently Asked Questions About PEX vs Copper
Is PEX better than copper for repiping?
Both materials are reliable. PEX is flexible and cost-effective, while copper has a long track record and rigid durability.
Does PEX last as long as copper?
Both materials are designed for long-term residential use. Lifespan depends on installation quality and water conditions.
Is PEX safe for drinking water?
Yes. PEX piping approved for residential use meets safety standards for potable water systems.