What the house is hiding
Age of home predicts most of it.
None of these findings make a house unbuyable. All of them are cheaper to know about before an offer than after a buyer's inspector raises them. Here is what each one is, how it is identified, and what it means at closing.
Read this first
Undisturbed is not the same as dangerous.
Most hazardous materials in a house are harmless while they are intact and left alone. They become a problem when someone sands, cuts or demolishes them without knowing they are there—which is exactly what an ordinary renovation does.
Start here
Enter the year it was built.
Construction date predicts most of this. The profiler takes one number and tells you which of the guides below actually apply to a home of that era — and what to do first about each.
Asbestos
The most common hazardous material in Halton's housing stock, and the one most often disturbed by ordinary renovation. Asbestos is not dangerous while it is intact and undisturbed.
Read the guide →Any home, of any age, in any neighbourhoodRadon
A naturally occurring radioactive gas that enters through the foundation and accumulates indoors. It is the second leading cause of lung cancer in Canada after smoking.
Read the guide →Any ageMould
Almost always a symptom rather than a cause. Removing mould without finding and fixing the water that fed it guarantees it returns, usually in the same place, usually within a year.
Read the guide →Poly-B (polybutylene, grey flexible pipe) roughly 1978 to the mid-1990sKitec & poly-B plumbing
Two different plumbing systems, from two different eras, that share one characteristic: their presence changes a transaction. Both were installed legally and in good faith, and both have a history of failure that insurers and buyers now price in.
Read the guide →Knob-and-tube: roughly 1900 to the 1950sKnob-and-tube & aluminum wiring
Two older wiring methods that are not automatically unsafe but are automatically an insurance conversation. In both cases the risk is concentrated at connections and in what later owners did to the system, not in the original installation.
Read the guide →The order that saves money
Test before you finish. Always.
The single most expensive sequencing mistake in renovation is finishing a space and then discovering what was behind it. A radon test costs very little. Opening a finished basement to install mitigation afterwards does not.
- Identify the era of the house and what it typically contains
- Test or sample before demolition, not during it
- Resolve the moisture source before any finishing work
- Use a contractor certified for that specific material
- Keep every report, invoice and clearance document
- Disclose what you know when you sell
This is general information, not an assessment.
Identifying a hazardous material in a specific property requires qualified professionals, appropriate sampling and accredited laboratory analysis. Regulations, guidelines and product standards change. Nothing here replaces a professional assessment, a home inspection, or advice from a lawyer about your disclosure obligations when selling.
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