Poly B is one of the top deal complications in the Coquitlam resale market. Buyers who know the right questions to ask — and who get a professional inspection — are in a much stronger negotiating position.
Why Poly B Is a Buyer's Issue, Not Just a Seller's
When a home sale involves Poly B, the buyer carries the risk if they close without addressing it. Sellers are required to disclose known material defects in BC, but Poly B can be in the walls without the seller knowing — particularly if they've never had an issue, or if their own insurer hasn't flagged it yet.
The home inspector will note the pipe material if it's visible (mechanical room, crawl space, under sinks). But home inspectors are not plumbers, and they don't open walls. An inspector can tell you that visible pipe appears to be polybutylene. They can't tell you what's in the walls, how degraded it is, or what replacement would cost.
That gap — between what a home inspector notes and what a plumber can assess — is exactly where buyers get caught. You close on the home thinking "the inspector mentioned Poly B" without realizing that "mentioned Poly B" and "fully assessed the Poly B risk" are very different things.
The Questions to Ask Before Making an Offer
Before you're even in the offer stage, ask your realtor to find out: Has the Poly B been replaced? If yes, what documentation exists? If no, has the seller's insurer flagged it?
If the Poly B hasn't been replaced, ask: What is the build year? (Anything 1978–1995 means probable Poly B throughout.) Has there ever been a Poly B-related water damage claim on the property? What is the current insurer, and have they imposed any conditions related to Poly B?
None of these are unreasonable questions. A seller who's been living with Poly B for 30 years knows exactly what it is and what their insurer has been saying about it.
- Has the Poly B been replaced? If yes, request the completion documentation.
- If no, what year was the home built?
- Has there ever been a Poly B water damage claim?
- Has the seller's insurer imposed any Poly B conditions?
- What carriers are writing coverage on this home right now?
Getting a Professional Pre-Purchase Inspection
If the seller can't confirm Poly B replacement with documentation, book a professional Poly B inspection before your subject conditions are removed. This is different from a general home inspection — it's a focused assessment of the plumbing system by a licensed plumber who works specifically with polybutylene.
A professional inspection will confirm whether Poly B is present, assess the condition at all accessible points (mechanical room, crawl space, under sinks), identify the percentage of the home estimated to contain Poly B, and produce a written report with photos. It will also include a replacement cost estimate — the number you need to negotiate with.
We offer pre-purchase inspections across Coquitlam, Port Coquitlam, Port Moody, and surrounding areas. We can typically schedule within 48–72 hours and deliver the report same day.
How to Use the Inspection to Negotiate
A written inspection report with a replacement cost estimate is a negotiating tool. Your options:
Ask for a price reduction equal to the replacement cost. This is the cleanest approach — you accept the Poly B as-is, close at the reduced price, and arrange replacement on your own timeline after possession.
Ask for a seller credit at closing. Similar to a price reduction but structured differently for financing purposes. The credit covers the replacement cost.
Make replacement a condition of the purchase. Require the seller to arrange and pay for Poly B replacement before closing, with documentation provided at completion. This is more complex to execute but leaves you taking possession of a fully repiped home.
Walk away. If the seller won't negotiate and the Poly B situation is advanced, walking away is a legitimate outcome. Better to know before closing than after.
Your realtor needs the written report to present any of these positions credibly. A vague "the inspector said Poly B" doesn't move a seller. A written scope with photos and a $7,500 replacement estimate does.
After You Close — If You Didn't Address It
If you've already closed on a home with Poly B and you didn't address it before closing, the priority is: find out what your new insurer's position is. At policy transfer, most BC insurers require a full property disclosure including plumbing material. If Poly B is disclosed, expect either a surcharge or a replacement condition in the new policy.
Get your inspection done, get a quote, and plan for replacement within your insurer's required timeframe. Contact Coquitlam Poly B Replacement for a free inspection and we'll give you the full picture.