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Poly-B Replacement in Markham, ON
Find trusted poly-B replacement guidance and community-specific information for Markham area homeowners.
Markham · Poly-B
Poly-B in Markham homes
Polybutylene plumbing was commonly installed in Markham homes built between 1978 and 1998. If your home was constructed during this period, there's a possibility it contains poly-B pipes. Many insurance companies in Ontario now have specific policies regarding polybutylene plumbing, including potential surcharges or requirements for replacement. Learn more about poly-B →
Markham grew out of the 1980s. The 2021 Census counts 20,570 occupied dwellings from 1981–1990, more than any other single census period in the city, and another 17,265 from 1991–2000, together 34.1% of its 110,865. Only 2.6% of Markham’s housing predates 1961, so for most owners the question is whether the house went up before or after poly-B left the market.
Markham is part of York Region, which receives some of its drinking water from the City of Toronto’s system (Toronto drinking water report). Any plumber you hire in Ontario must hold a certificate, provisional certificate or registered training agreement and appear on the public register (Skilled Trades Ontario). The Toronto & GTA guide sets Markham beside Vaughan, Richmond Hill and the other 905 cities.
When Markham's homes were built
The share of homes built during the poly-B years is the best single predictor of how common it is in a city.
Occupied private dwellings by period of construction · Markham · 2021 Census
Census periods overlapping 1978–1998 (1981–1990, 1991–2000)
City-wide
The census groups construction years into periods, so 1981–2000 is the closest match to the 1978–1998 poly-B window.
Markham Communities with Poly-B Information
8 community guides.
Next steps
Identify
Use the photo guide and the interactive identifier to check if you have poly-B.
Identification guide
Estimate
Calculate replacement costs for your home size.
Cost calculatorGet help
Request a quote; the HAUSE desk connects Markham homeowners with a local replacement contractor where available.
Request a quoteHAUSE desk · Request
Ready to Address Your Poly-B?
Get started with a cost estimate and, with your consent, an introduction to a local replacement contractor in Markham.
- 01A person reads itThe HAUSE desk reviews the age of the home, what you found and how urgent it is.
- 02You get a replyBy email from info@hause.ca or by phone from 403-679-3100, with practical next steps.
- 03Matched where availableWith your consent, your request goes to a local replacement contractor so they can quote.
- 04You decideNo obligation. Use the guides and the cost calculator to compare what you are quoted.
Updated 2026-09-30