# PEX vs copper repiping: which fits your house?

> PEX vs copper repiping for a Columbus house: typical price ranges, copper's price climb, hard water, freezing, rodents, sunlight and where each one fits better.

URL: https://slaterepipingcolumbus.com/guide/pex-vs-copper/

Decision Guide

Both are allowed by the Ohio Plumbing Code. The choice turns on the house: its access, its exposure to cold and sunlight, the budget, and how long the owner plans to stay.

Last Updated: October 29, 2026

Decision Guide

Both are allowed by the Ohio Plumbing Code. The choice turns on the house: its access, its exposure to cold and sunlight, the budget, and how long the owner plans to stay.

Last Updated: October 29, 2026

For most Columbus houses, PEX costs less and needs fewer wall openings, while copper suits owners who want rigid metal pipe and runs that stay exposed. The Ohio Plumbing Code allows both, so the choice turns on the house, not the law. Neither is the right answer for every home.

[Slate Repiping Columbus](https://slaterepipingcolumbus.com/) offers and manages [PEX repiping](https://slaterepipingcolumbus.com/pex-repiping/) and [copper repiping](https://slaterepipingcolumbus.com/copper-repiping/) across Columbus and nearby Franklin County communities, carried out by licensed and insured plumbing contractors. This guide sets out the trade-offs as they apply to Columbus water, Columbus winters and Columbus houses.

Key takeaways

- Typical Columbus-area PEX repipe: $4,000 to $12,000. Copper: roughly $6,000 to $18,000 or more, depending heavily on house size.
- Copper mill prices rose about 30% in a year in the BLS producer price index; plastic pipe rose about 4 to 5%.
- Columbus water is lime-softened and treated with a corrosion inhibitor, so hardness rarely decides the choice.
- PEX must be kept out of sunlight; copper must be kept from freezing just the same.
- Many houses end up with both: PEX through walls, copper where pipe stays exposed.

## What the code allows in Columbus

The Ohio Plumbing Code (OAC 4101:3) is built on the 2021 International Plumbing Code, and that code lists PEX, CPVC and copper tube for water distribution. Under the Residential Code of Ohio, the plumbing code governs 1, 2 and 3 family homes, so the same material list applies in a Clintonville bungalow, a German Village double or a Hilliard two-story. Each product has to be installed to its listing and the manufacturer’s instructions, and the work needs a plumbing permit; the [Columbus repiping permit guide](https://slaterepipingcolumbus.com/guide/repiping-permit-columbus/) covers who issues it.

One part of the system is not a choice. Inside Columbus, the City requires Type K soft copper for 2-inch and smaller service pipe from the main through the curb stop, so the buried line from the street usually stays copper even when everything inside the house becomes PEX.

## PEX and copper side by side

| Question | PEX | Copper |
| --- | --- | --- |
| Typical Columbus-area whole-house range | $4,000 to $12,000 | Roughly $6,000 to $18,000+, depending heavily on house size |
| Material price movement over a year (BLS PPI) | Plastic pipe up about 4 to 5% | Copper mill shapes up about 30% |
| Wall openings | Usually fewer and smaller; tubing bends around framing | Usually more; rigid runs need straight paths and fittings at each turn |
| Joints | Crimp, clamp or expansion fittings; fewer of them | Soldered or press fittings at every change of direction |
| Sunlight | Must be shielded from UV after installation | Not affected |
| Freezing | Can stretch slightly; fittings and tubing can still fail | Can split; joints can open |
| Rodents in crawlspaces or attics | Can be chewed | Not a concern |
| Exposed runs on a basement ceiling | Works, but sags without enough support | Looks tidy and stays rigid |

The ranges are typical Columbus-area ranges, not quotes. The [Columbus repipe cost guide](https://slaterepipingcolumbus.com/guide/repiping-cost/) explains what sits inside each number.

## Cost: why the gap has widened

PEX usually costs less for two reasons. The tubing costs less per foot, and it takes less labor: one length can run from the basement to a second-floor bath with few fittings, where copper needs an elbow at each turn and a joint at each one.

The material gap has also grown. In the Bureau of Labor Statistics [producer price index](https://www.bls.gov/ppi/), copper and brass mill shapes were about 30% higher than a year earlier, while plastic pipe rose about 4 to 5%. That movement shows up in copper quotes more than in PEX quotes. Labor is not the reason for the difference: BLS puts the median plumber wage in the Columbus metro at $30.41 an hour against $30.67 nationally, so a copper job costs more here for the same reasons it does anywhere.

## Columbus water and both materials

Columbus lime-softens its water and adds a zinc orthophosphate corrosion inhibitor, according to the City’s water quality report. Plant results show hardness of about 5.7 to 7.3 grains per gallon and a pH near 7.8. That is moderately hard water that has been treated to protect pipe walls, which is why a single pinhole in a Columbus copper line does not prove the water is eating the pipe.

Hard water does not choose for you. PEX tubing cannot corrode, but a PEX system still has brass or plastic fittings, and fittings are where its chemistry questions sit. Copper’s known weak point is pitting in particular runs, for reasons that range from water velocity to workmanship; the [copper pinhole leak guide](https://slaterepipingcolumbus.com/guide/copper-pinhole-leaks/) covers those. Scale building up inside either material is rarely the deciding issue on treated City water. The [Columbus water pressure and hard water guide](https://slaterepipingcolumbus.com/guide/columbus-water-pressure-hard-water/) goes further into the chemistry.

## Freezing, rodents and sunlight

These three are where honest comparisons usually stop being one-sided.

**Freezing.** Columbus averages about 103 nights a year at or below 32 degrees at the airport station, and about 10 a year at or below 10 degrees, by NOAA’s climate normals. PEX can stretch a little when the water inside freezes, so it sometimes survives a freeze that would split copper. It is not freeze-proof: fittings can pull apart and tubing can still burst in a hard freeze. Pipe in an exterior wall, a crawlspace or an unheated garage is at risk whatever it is made of. A repipe is the moment to move lines to interior walls and insulate what has to stay near the cold.

**Rodents.** Mice and other rodents can chew plastic tubing where they get into a crawlspace or attic. Copper is not a target. In a house with a dry, sealed basement this rarely matters; in a house with a vented crawlspace and a rodent history, it is worth raising before choosing PEX for that section.

**Sunlight.** PEX breaks down under ultraviolet light, so it cannot run exposed outdoors or sit in sunlight through a basement window, and it has limits on how long it can be stored uncovered before installation. Copper has no UV concern. Every PEX line has to be covered or shielded once it is in.

## Access, openings and older Columbus houses

Access is often what tips the decision. About 51% of Columbus homes on the County Auditor’s records have a full basement, and in most of them the main and many branches can run along exposed joists in either material. The difference shows where pipe has to climb. Flexible PEX can be pulled up through a wall cavity from a small opening at the top and bottom; rigid copper usually needs more openings to make each turn.

In a two-story brick house with [plaster walls](https://slaterepipingcolumbus.com/old-house-repiping/), that difference is real money and real mess, because plaster patching costs more than drywall patching. In a one-story ranch with an open basement, it can be small enough that copper’s higher price is the only gap left. The [guide to how invasive repiping is](https://slaterepipingcolumbus.com/guide/how-invasive-is-repiping/) shows where openings usually land.

## Layout, flow and noise

PEX can be laid out trunk-and-branch like copper or as home runs from a manifold, where each fixture gets its own line from a valve panel. Each has trade-offs in tubing length, hot-water wait and the number of hidden fittings, and the [manifold vs trunk-and-branch guide](https://slaterepipingcolumbus.com/guide/manifold-vs-trunk-and-branch/) compares them.

Sizing matters with PEX. Some fitting types narrow the bore at each joint, so a PEX system has to be sized for that, or a shower can feel weaker than it did on old copper. Homeowners report slower showers and longer hot-water waits after poorly planned PEX jobs; both trace to design, not the material. PEX’s flexibility also absorbs some of the surge that causes water hammer, while copper can transmit more noise along a rigid run unless it is well supported.

## Two details owners often miss

**Electrical bonding.** In many older houses, the metal water pipe was part of the electrical bonding path. Replacing it with plastic can change that. An electrician should check bonding when a repipe replaces metal pipe with PEX.

**Mixed systems.** Choosing PEX does not mean every inch is plastic. Copper or brass often stays at the water heater connections, the main shutoff and some exposed runs. Transitions have to use listed fittings, and the written scope should say which material runs where. Where galvanized steel meets copper, the transition needs the right fitting too; the [galvanized pipe replacement](https://slaterepipingcolumbus.com/galvanized-pipe-replacement/) page covers that interface.

## Which one fits your house

PEX tends to fit when the budget matters, when pipe has to snake through finished walls, when plaster makes every opening expensive, or when the house has long runs to an upstairs bath. Of the repipe-type permits in the Franklin County Auditor’s records that name a material, PEX appears more often than copper.

Copper tends to fit when runs stay exposed, when a crawlspace has a rodent history, when lines pass near heat or sunlight, or when the owner simply prefers metal pipe and accepts the higher price. Neither choice removes the need for a pressure test before walls close, support at the right spacing, and protection from cold. Whether [PEX is safe for drinking water](https://slaterepipingcolumbus.com/guide/is-pex-safe/) is a separate question, covered in its own guide. To compare both for a specific house, start with the [repiping cost estimator](https://slaterepipingcolumbus.com/tools/repiping-cost-estimator/) or call to set up a walk-through.

## Questions about this guide

### Is PEX better than copper for hard water in Columbus?

Neither wins on hardness alone. Columbus lime-softens its water to about 5.7 to 7.3 grains per gallon and adds a zinc orthophosphate corrosion inhibitor, so scale is not usually what decides the choice. PEX tubing cannot corrode, but its brass fittings can be affected by water chemistry; copper's risk is pitting in some runs rather than scale.

### Do mice chew through PEX pipe?

They can. Rodents sometimes chew plastic tubing where they get into a crawlspace or attic, while copper is not a target. In a dry, sealed basement it rarely matters. In a vented crawlspace with a rodent history, copper or protected PEX for that section is worth discussing before the material is chosen.

### Can a house mix PEX and copper?

Yes. Many repipes run PEX through walls and keep copper where pipe stays exposed, such as at the water heater or along a basement ceiling. The transition has to use listed fittings, and the scope should say which material runs where.

## Related service

### PEX repiping

A repipe in crosslinked polyethylene tubing, with the tubing type, fitting system and layout chosen for the house and written into the scope.

## More guides

- Learn [Is PEX safe for drinking water?](https://slaterepipingcolumbus.com/guide/is-pex-safe/)PEX sold for drinking water is tested and listed for it. Listing is not the end of the story, though: product choice, sunlight, chlorine exposure, fittings and installation decide how a PEX system behaves over time.
- Cost Guide [How much does it cost to repipe a house in Columbus?](https://slaterepipingcolumbus.com/guide/repiping-cost/)Typical Columbus-area ranges for a whole-house repipe in PEX or copper, what sits inside the price, the permit fees by office, and why two quotes for the same house can differ.
- Decision Guide [Should a PEX repipe use a manifold or trunk-and-branch layout?](https://slaterepipingcolumbus.com/guide/manifold-vs-trunk-and-branch/)How a home-run manifold and a trunk-and-branch layout each carry water to the fixtures, how they differ on flow, hot water wait, shutoffs and openings, and the house details that tip the choice.
- Learn [Should CPVC pipes be replaced?](https://slaterepipingcolumbus.com/guide/cpvc-pipes/)CPVC is an approved water pipe, and sound CPVC can stay. What changes the answer is how it has aged: brittleness near heat, joints that let go, and repairs that crack the pipe next to them.
- Learn [Does Columbus have hard water, and do you need a pressure-reducing valve?](https://slaterepipingcolumbus.com/guide/columbus-water-pressure-hard-water/)The City's own treatment numbers for each of its three plants, how that water treats old and new pipe, why nobody can quote you a Columbus street pressure, and how to tell whether your house needs a pressure-reducing valve.