PEX or Copper: What to Repipe a North Shore Home With

What PEX and copper actually are

Copper pipe is rigid metal tubing, joined with soldered or press-fit fittings at every turn and every branch. It has been the standard supply material in North America for over sixty years, and a well-installed copper system genuinely can last that long. It is also unforgiving. Copper does not stretch, so a hard freeze that turns the water inside it to ice can split the pipe wall, and a nail or screw driven through a wall during a later renovation can puncture it just as easily as it would puncture any metal.

PEX, short for cross-linked polyethylene, is flexible plastic tubing that comes in coils rather than rigid lengths. It is joined with crimp or expansion fittings rather than solder, which means no open flame anywhere near the framing during installation. Because it is flexible, a single run of PEX can snake from a manifold near the water heater to a fixture with far fewer joints than copper needs to make the same trip through walls and floors, and fewer joints means fewer places a leak can start.

Both materials are accepted throughout the BC Plumbing Code, which is Part 7 of the BC Building Code. PEX tubing used in BC has to meet CSA B137.5, the Canadian standard governing cross-linked polyethylene pipe systems, and fittings have to be listed and installed to the manufacturer's instructions and the code's general requirements for potable water piping. Copper piping and fittings are governed under their own long-established CSA and ASTM standards referenced throughout Part 7. Neither material is a compliance question. The choice comes down to performance and cost in your specific house.

Freeze resistance, and why it matters more under a North Shore house than most

This is the single biggest technical difference between the two materials, and it is the one that decides the recommendation on a large share of our North Shore repipe projects. Water expands by roughly 9 percent when it freezes. Rigid copper pipe has almost no give, so when water inside it freezes solid, the pressure has nowhere to go and the pipe wall can crack or split outright. The failure usually shows up later, not during the freeze itself: the ice thaws, water starts flowing again, and it finds the crack.

PEX tubing flexes. When water inside it freezes, the tubing itself can expand slightly to accommodate the ice, and in most cases it survives a freeze event that would split copper. This does not make PEX freeze-proof. Insulate exposed pipe and keep crawl space temperatures above freezing regardless of material. It does mean PEX has meaningfully more margin for error in the conditions that actually cause freeze damage on the North Shore: an unheated crawl space, a cold snap, and a pipe run that sits closer to an exterior wall or a vented foundation opening than anyone intended when the house was built.

Unheated crawl spaces are common under North Shore houses built from the 1950s through the 1980s, and a crawl space that has never been sealed or insulated under Section 9.18 of the BC Building Code can drop close to outdoor temperature during a hard winter cold snap. We see burst pipes in exactly this condition almost every winter: a supply line running through a vented, uninsulated crawl space, original galvanized or copper, that has survived forty winters and finally fails during the one week it drops below minus five.

What each one costs on a real North Shore repipe

A full repipe means replacing all the supply piping in a house, not just the section behind one opened wall. For a typical 3-bedroom North Shore home, PEX runs $4,500 to $9,000 including labour, while the same scope in copper runs $9,000 to $16,000, meaning PEX comes in roughly 40 to 50 percent less. The gap comes from two places: raw material cost, where copper tubing costs several times more per foot than PEX, and labour time, where PEX's flexibility and simpler fittings let a plumber run more of the house per day than soldering copper joint by joint allows.

That cost gap narrows somewhat on a smaller scope, like replacing supply lines to a single renovated bathroom, since the fixed costs of access and fixture connection make up a larger share of a small job regardless of material. On a whole-house repipe, where the pipe run length dominates the cost, the material choice has the biggest dollar impact.

The other cost driver, independent of material, is how much of the house is already open. This is why a repipe so often gets folded into a larger renovation rather than done as a standalone project. Demolition, wall access, and drywall repair are a large share of what a repipe costs when the walls have to be opened specifically for it. When a kitchen or bathroom renovation has already opened those same walls, the added cost of running new pipe through the rest of the house drops significantly compared to starting from a finished house.

What we find behind North Shore walls, and why it decides the repipe

Two materials come up again and again when we open a wall on an older North Shore house. Galvanized steel supply pipe, common in construction before the 1960s, is steel pipe with a zinc coating that corrodes from the inside over decades, gradually narrowing the pipe's interior diameter until water pressure drops noticeably at the fixtures. Once we find galvanized pipe behind an opened wall, replacement is close to automatic. It is well past its practical service life almost everywhere we encounter it.

Polybutylene, a grey flexible plastic supply pipe used through the 1980s and into the early 1990s, is the other material we replace on sight. It has a documented history of fitting failures, particularly at the plastic and metal transition fittings common in this era's installations, and most home insurers treat a polybutylene system as a known risk. If your North Shore house was built or last replumbed in this window, check for it specifically, since it is not always obvious from the pipe alone.

Original copper from the 1960s and 70s is a different conversation. It has generally held up well, and the decision to replace it is less about failure risk and more about whether the renovation has already opened the walls it runs through, and whether the household wants the freeze margin PEX offers under an unheated crawl space.

When a hybrid approach makes sense

Not every repipe has to be one material throughout the house. A hybrid approach, PEX for the branch lines running through walls, floors, and the crawl space, with a short run of copper at the water heater connection and any exposed exterior hose bib lines, is common and code-compliant. Copper handles heat and UV exposure at those specific points better than PEX does, while PEX handles the bulk of the run, where freeze resistance and installation speed matter more.

This is worth discussing with your plumber rather than assuming one material has to win outright. On a house with a mix of conditions, a heated interior for most of the run and an unheated crawl space or garage wall for a section of it, matching the material to the condition at each section of pipe is often the more defensible engineering choice than a single blanket decision.

What we recommend on most North Shore repipe projects

For a whole-house repipe on a North Shore home with an unheated or partially conditioned crawl space, which describes a large share of the housing stock built between 1955 and 1985, we generally recommend PEX. The freeze margin matters in a coastal climate that gets occasional hard cold snaps rather than sustained deep freeze, which is exactly the condition where a rigid pipe with no cold-weather history can fail without warning. The cost advantage on a full-house scope reinforces the recommendation rather than working against it.

Where a client has a strong preference for copper, based on its long service record or a specific concern about PEX and taste or plastic contact with water, that is a reasonable position and copper remains a fully code-compliant choice. The decision is a genuine trade-off between upfront cost and freeze margin on one side, and long-established material history on the other, not a case where one option is deficient.

If you are planning a repipe alongside a renovation that already opens the walls, the permit conversation is a separate question from the material choice. We wrote a full guide to when a homeowner can pull their own plumbing permit in North Vancouver, and how that changes once a secondary suite enters the plan.