Finding the perfect home in Montreal is exciting. Whether it is a beautiful 1920s duplex in the Plateau or a detached home on the South Shore, it is easy to fall in love with a property.
But before you officially buy, you need a home inspection. Think of it like a doctor’s check-up for the house. Because of Montreal’s freezing winters, hot summers, and unique soil, our homes face specific problems.
Here are five serious red flags you should never ignore during an inspection.
1. The Wrong Kind of Foundation Cracks
Almost every basement in Montreal has tiny, hairline cracks. Those are usually normal. The ones that should scare you run horizontally (sideways) rather than vertically (up and down).
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Why it matters: A horizontal crack means the frozen winter soil or wet clay is pushing hard against the basement walls. It can cause the walls to buckle inward, which is a massive structural emergency.
2. The Dreaded “Pyrite”
If you are looking at homes built between the 1970s and 1990s (especially on the South Shore or the West Island), you will hear the word “pyrite” a lot. Pyrite is a type of stone fill used under concrete garage and basement floors.
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Why it matters: When pyrite gets wet, it swells up. It can lift concrete floors, create huge cracks, and even leave a weird white powder on the ground. Fixing it requires jackhammering the whole floor out, which costs a fortune.
3. Rotten Cast Iron Plumbing
Many Montreal “plexes” and older homes built before 1970 still have their original cast iron drain pipes hidden in the walls or under the basement floor.
- Why it matters: These pipes rust and break down from the inside out over 50 or 60 years. If the inspector spots a rusted main drain, it means a backup or a major leak is coming. Replacing it usually means breaking up the basement floor.
4. Water Infiltration and Iron Ochre
Water is a house’s worst enemy. If the basement smells musty, has dark stains on the drywall, or has a French drain that is orange and slimy, you have a water problem.
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Why it matters: That orange slime is called iron ochre. It is a natural bacteria in certain Quebec soils that clogs up drainage pipes. Once blocked, water will flood into the basement, leading to dangerous mold.
5. Hidden Asbestos (Vermiculite)
In many older homes, the attic insulation looks like little pebbles. This is often a material called vermiculite, and a lot of it sold in Canada before 1990 contains asbestos.
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Why it matters: Asbestos is safe if it is left alone, but if you want to renovate or add pot lights, it becomes dangerous to breathe in. Safely removing asbestos requires a specialized crew and can cost thousands of dollars before you even start your actual renovations.
The Bottom Line: A red flag doesn’t always mean you shouldn’t buy the house. It just means you need to know the cost of the repair before you buy it, so you can ask the seller to drop the price or fix the issue.
Have questions about a property you’ve been eyeing? Contact us and let’s make sure your next home purchase is a safe and smart one!