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PEX vs Copper Plumbing in an Ontario House (2026): Cost Per Foot, Manifold vs Trunk and Branch, Fittings, Freezing, Noise, and What Insurers Think
Plumbing & Water
PEX or Copper: Both Are Good Pipe, and the Plumber Matters More Than the Pipe
Most new Ontario houses are plumbed in PEX now, and plenty of older houses have had the same copper for 60 or 70 years. Neither fact settles anything. Both are permitted, both last when they are installed properly, and both fail when they are not. This page sets out what each costs as material, how the systems are laid out, where each one is weak, and what to choose for a new house and for a repipe.
The numbers
$1.50 to $4.00PEX per linear foot, material only
$4.00 to $12.00copper per linear foot, material only
$4,500 to $15,000whole-house repipe, a GTA plumber
none publishedinstalled PEX vs copper difference
| Item | Range | Note |
|---|---|---|
| PEX pipe, per linear foot | $1.50 to $4.00 | supply only, a GTA plumber |
| Copper pipe, per linear foot | $4.00 to $12.00 | supply only, same plumber |
| Whole-house repipe | $4,500 to $15,000 | a GTA plumber |
| Partial repipe | $1,000 to $4,500 | |
| Drywall access and repair, finished areas | +$500 to $2,000 | often more with plaster |
| Home-run manifold system | quoted per job | no published price found |
| CPVC pipe, per linear foot | $1.50 to $3.25 | supply only, same GTA plumber |
Material is the smaller part of the bill. Say a house has 600 ft of water pipe, which is our round number for the example, not a measurement: PEX at 600 x $1.50 to 600 x $4.00 is $900 to $2,400, and copper at 600 x $4.00 to 600 x $12.00 is $2,400 to $7,200. Labour, fittings and the walls decide the rest.
Why Ontario prices are all over the map: the plumbers we checked for this page quoted very different prices for the same repipe. One GTA plumber said $4,500 to $15,000 for a whole house. Another said $3,500 to $8,000 for Poly-B and $4,000 to $10,000 for galvanized, and one of those pages printed $2,000 to $8,000 in its summary and a different range in its own table. The gap is house size, finished walls, plaster, and how much of the house is open. Budget the middle for your house size, and get two or three quotes on the same written scope.
Trunk and Branch, or Home Run
There are two ways to lay out the water lines. Trunk and branch is the old way and works with any pipe: a big main runs through the house and smaller lines tee off it to each room. Fewer feet of pipe, more fittings hidden in the walls.
A home-run system is a PEX idea. Every fixture gets its own line straight from a manifold, a kind of switchboard for water, usually near the water heater. More feet of pipe, almost no fittings in the walls, and a shut-off for every fixture in one place. When the toilet in the ensuite leaks, you turn off one valve, not the house. Nobody we found publishes an Ontario price for a manifold system, so ask your plumber to quote it both ways.
Many plumbers do a hybrid: a trunk to each bathroom group and short branches from there. That is a perfectly good house too.
Where Each Pipe Is Strong, and Where It Is Not
- Fittings. PEX joins with expansion fittings (the pipe is stretched over the fitting and shrinks back on it) or crimp and clamp rings (a ring is squeezed over pipe and fitting). Each system wants its own fittings and its own tool, and the pipe has to be rated for the system used. A plumber who mixes them is a plumber to watch. Copper is soldered or joined with press fittings.
- Freezing. PEX stretches a little when water freezes in it, and copper does not, so PEX survives some freezes that would split copper. It is not freeze-proof, and the fittings can still let go. Pipe in an unheated space needs heat or draining either way; the cottage winterizing page covers that.
- Noise. PEX is usually quieter. Copper carries water hammer and the rush of a running tap through the house. The fixes for banging pipes are on the water pressure problems page.
- Sunlight. PEX breaks down in sunlight. It should be stored in its bag and never run where daylight reaches it. A coil that sat in the sun on a job site for a summer is a coil to send back.
- Mice and squirrels. Rodents chew plastic, including PEX. In a cottage or a crawlspace with visitors, that is worth a thought.
- Water chemistry. Very aggressive water, low pH or high in some minerals, can pit copper from the inside over decades. A lab test of well water will tell you; the water testing and treatment section explains it.
- Heat. Near a water heater, follow the heater’s installation manual for what pipe and connectors it wants at the heater. A good plumber reads it.
What Inspectors and Insurers Think
Ontario plumbing is Division B, Part 7 of the Building Code, O. Reg. 163/24, adopted from the 2020 National Plumbing Code with Ontario changes. The inspector does not care which pipe you chose as long as it is a permitted material, properly marked, supported and installed to the maker’s instructions, and it passes the pressure or water test before the walls close.
Insurers care about the pipe, but not the pipe you are thinking of. Their questions are about Poly-B (the plastic pipe from the 1980s and 1990s), Kitec (blue and orange pipe with brass fittings, mid 1990s to 2000s) and old galvanized steel. Some refuse or surcharge those. The Kitec class action is closed; the claim deadline was January 9, 2020. Modern PEX is not Poly-B, but if your broker is unsure, get it in writing. The old pipe replacement page has the repipe costs by house size.
The licence matters more than the pipe. Plumber is a compulsory trade in Ontario; whoever repipes your house must hold a Certificate of Qualification, a provisional certificate, or be a registered apprentice working under one, and it is checkable on the Skilled Trades Ontario public register. A repipe is renewing the plumbing, which needs a permit, and nothing gets covered before inspection; check the details with your building department.
What to Pick
- New house: let the plumber use what he installs every day, which in Ontario is usually PEX. Ask whether it is home run, trunk and branch or a hybrid, and get a shut-off at each fixture either way.
- Repipe in a finished house: PEX, usually. It snakes through walls with fewer holes, and the walls are the expensive part. Copper costs more per foot and needs more access.
- Exposed pipe in a basement you want to look nice: copper still looks like plumbing should, and it does not mind the odd knock.
- Radiant floors are a different pipe. The tubing in a heated slab is PEX made for heating, with an oxygen barrier, and it is designed by the heating side; the radiant floors page covers it.
Questions people ask
Is PEX cheaper than copper?
As material, yes: $1.50 to $4.00 a foot for PEX against $4.00 to $12.00 for copper, from a GTA plumber. Installed, no Ontario source publishes the difference, so get your plumber to quote both.
How long does PEX last?
Nobody has 70 years of PEX in Ontario houses yet, because it has not been around that long. Installed properly, out of sunlight and with the right fittings, it is expected to last for decades.
Will my insurer care if my house has PEX?
Usually not. The pipes insurers ask about are Poly-B, Kitec and galvanized. If your broker is unsure about your PEX, get the answer in writing.
Does PEX freeze and burst?
It handles a freeze better than copper because it stretches, but it can still split or a fitting can let go. Keep it warm or drain it.
Is CPVC still used?
Some plumbers use it, mainly for repairs to houses already plumbed in it. The same GTA plumber lists it at $1.50 to $3.25 a foot as material; installed, it is quoted per job.
Price the plumbing, not just the pipe
The plumbing cost estimator prices a new house by fixtures, which is how plumbers price it, whatever pipe they use. If you have repipe or new-house quotes in PEX and copper, the $99 review reads up to three of them and tells you whether they are pricing the same job.
Sources and further reading
- The 2024 Ontario Building Code: Ontario on the 2024 Code: in force January 1, 2025, the grace period to March 31, 2025, and the harmonization with the national codes.
- Skilled Trades Ontario: Plumber: the compulsory plumber trade, the 9,000-hour apprenticeship and the Certificate of Qualification that must be renewed to be valid.
- Skilled Trades Ontario public register: where you check that the plumber on your quote can legally work in the trade, by name or ID number.
