Is Poly B plumbing common in Hamilton?
The straight answer
Less common than in the suburbs around it, but far from rare. About 23 percent of Hamilton’s housing stock was built in the 1978 to 1998 Poly B window, against a city that is mostly pre-1980. The risk concentrates in the 80s and 90s subdivisions, where some neighbourhoods run above 80 percent.
The longer version
Hamilton is an older city overall: the biggest single block of its homes predates 1960, and 2021 census construction periods put about 23 percent of dwellings in the 1978 to 1998 window. That city-wide number hides a lot of variation. The neighbourhoods built out in the eighties and nineties are a different story, with Westmeria and St. John’s at 92 percent of homes in the window and Gersholme, Rushdale and Barnstown in the mid-80s. The Hamilton neighbourhood profiles cover all 206 areas, and the city profile has the full construction breakdown.
If you find the pipe, replacement in Hamilton needs a permit for new or relocated plumbing, pulled by the owner or their agent, with a rough-in inspection under test before the walls close. The Hamilton permit page lays out the inspection ladder and how fees are set. To confirm what is in your own walls first, use the identification guide.
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