The short answer
Poly-B is a negotiating point, not a dealbreaker, for most buyers. You get a plumber's quote to repipe, then use it to lower the price or have the seller handle it. It only becomes a real problem if you can't get affordable insurance on the home as-is — and even then, a planned repipe usually solves it. Read the full guide to poly-B plumbing.
Why buyers worry about it
Two reasons: poly-B can fail without warning and cause sudden water damage, and a growing number of Canadian insurers won't cover an active poly-B home or add water-damage surcharges, exclusions, or higher deductibles. Because insurability affects your mortgage, that second one is the reason to sort it out before closing — see homes insurers won't cover.
When it's closer to a real problem
Poly-B is more serious when the home is on a well or high-chlorine municipal supply (which ages it faster), when the pipe already shows leaks or repairs, or when your insurer flatly declines coverage and a repipe isn't in your budget. In a rushed multiple-offer situation with no time to confirm insurance, walking can be the smart call.
What it costs to fix
A full-house repipe typically runs $4,000–15,000, depending on size, access, and the drywall and finishes that must be opened and patched afterward. That's your negotiating number — get it in writing from a licensed plumber.
How to handle it in your offer
- Have a licensed plumber confirm the material and quote a repipe.
- Ask your insurance broker for a quote on that specific home before you remove conditions.
- Use the repipe quote to negotiate a price cut or a seller-completed repipe.
- Make satisfactory insurance a condition of the offer where you can.