Buying · Latent defect · Water infiltration
The water arrives in spring, a few months after possession. What decides the outcome happens in the first 48 hours, before the first hammer blow.
Water infiltration is the most frequently raised latent defect, because it usually shows up in the first spring after closing. To qualify under article 1726 of the Civil Code of Quebec it has to meet four conditions: it must not have been perceivable by a prudent and diligent buyer without the need to resort to an expert, it must be serious enough to render the property unfit for its use or sharply diminish its usefulness, it must have existed before the sale, and it must have been unknown to you. The natural reflex, having it repaired immediately, is also the one that destroys the evidence: once the wall is closed, anteriority becomes very hard to establish. The sequence that protects your claim is document, give written notice, get an expert report, and only then repair.
Because urgency takes over. There is water in the basement, you call a contractor, you dry out, you redo the drywall, and six weeks later you write to the seller. By then nobody can establish how long the problem existed, and the seller rightly argues he never got to see it.
Article 1739 of the Civil Code of Quebec requires written notice within a reasonable time after discovery. It adds that where the defect appears gradually, the time begins to run on the day that the buyer could suspect the seriousness and extent of the defect. Infiltration that worsens from one episode to the next falls squarely in that case.
Infiltration has a source, and the source is what tells you whether the problem is old. In Quebec the usual entry points are looked at in this order: how surface water is managed around the building, the condition of the foundation drain, through-cracks in the foundation wall, window wells and basement windows, and roof junctions and flashing.
The drain deserves particular attention because it is invisible and it has a service life. Our pages on a French drain at the end of its life and on iron ochre explain what happens under the foundation and how it is checked without digging.
Infiltration caused by an event after the sale, by your own lack of maintenance, or by a condition clearly flagged in the inspection report. Article 1726 excludes both the apparent defect and the defect known to the buyer. A report that mentions humidity traces in the basement and recommends further investigation closes a door: the buyer knew the question had to be dug into.
That depends entirely on the policy and on where the water came from. Home insurance is designed for sudden and accidental damage, not for repairing defective or worn-out work. Report the claim quickly and ask your insurer for their position in writing; that answer becomes part of your file.
Yes, after giving him a real, documented opportunity to come and see. Keep everything: photos before, during and after, the materials removed, the invoices. A well-documented file partly compensates for the impossibility of later inspection.
Through the expert and through the traces. That is the anteriority question, covered in proving a latent defect.
The latent defect file: the four tests, the deadlines, the formal notice, the proof, the expert report, the six steps, small claims court, who pays, the seller who did not know, older homes, water infiltration, the roof, the inground pool and the septic system and the well.
Every article quoted here is reproduced from the official English text of the Civil Code of Quebec and the Code of Civil Procedure published by Légis Québec, both read on September 11, 2026. We give the article numbers so you can read them yourself. We are real estate brokers, not lawyers: we can tell you what the law provides and what your transaction left behind as evidence, but the analysis of your file belongs to a lawyer. When the amount at stake runs past a few thousand dollars, that call happens before the formal notice, not after.
The Loaa & Manseur team, led by Lotfi Manseur and Loaa Al Daow, is the number 1 team at RE/MAX Platine in 2024 and 2025, 6th RE/MAX team in Quebec, 15th in Canada and in the global top 50 of large residential teams according to the official RE/MAX ranking, computed on actual transactions. Its Google profile counts more than 220 reviews with a 4.9 rating. Its offices are at 55 avenue de l'Équinoxe in Brossard, one bridge from the island, and every broker's licence can be checked in the OACIQ public register. Three things to verify yourself before calling us, and to demand of any other broker.
Also available in French: version française de ce guide.
Published September 7, 2026 by the Loaa & Manseur team, the number 1 team at RE/MAX Platine in 2024 and 2025, 6th RE/MAX team in Quebec, 15th in Canada and in the global top 50 according to the official RE/MAX ranking. Tell us about your project.
Équipe no 1 de RE/MAX Platine en 2024 et en 2025, 6e au Québec, 15e au Canada et dans le top 50 mondial au classement officiel RE/MAX. Réponse en moins de 24 heures, sept jours sur sept.