Buying · Latent defect · Evidence
A latent defect is not proven with an invoice. It is proven with four separate demonstrations, and the one that loses the most files is anteriority.
In Quebec the buyer carries the burden. Article 2803 of the Civil Code provides that a person seeking to assert a right shall prove the facts on which his claim is based, and article 2804 adds that evidence is sufficient if it renders the existence of a fact more probable than its non-existence. You do not have to prove beyond doubt, you have to make your version the more probable one. Four elements flow from article 1726: the defect must be latent, meaning not 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 intended use or so diminish its usefulness that you would not have bought it or paid so high a price; it must have existed at the time of the sale; and it must have been unknown to you.
Article 2803 of the Civil Code of Quebec sets the rule: a person seeking to assert a right shall prove the facts on which his claim is based. In a latent defect file it is the buyer who builds the case, not the seller who has to prove innocence.
The standard is the one in article 2804: evidence is sufficient if it renders the existence of a fact more probable than its non-existence. That is the balance of probabilities. You do not have to eliminate every other explanation, you have to make yours more probable than the others.
Article 1726 provides that the seller is not bound to warrant against any apparent defect, and that an apparent defect is a defect that can be perceived by a prudent and diligent buyer without the need to resort to an expert. The bar is not a distracted layperson; it is a prudent and diligent buyer. A visible water stain on the ceiling on viewing day will not be a latent defect. A cracked foundation behind a finished wall will be.
This is where the pre-purchase inspection report cuts both ways. If it flags the problem, the defect becomes apparent. If it misses something a competent inspector would have caught, the inspector's own liability comes into play.
The same article 1726 requires a defect which renders the property unfit for the use for which it was intended or which so diminishes its usefulness that the buyer would not have bought it or paid so high a price. An annoyance is not a defect. A window that sticks, no. A septic system that cannot legally be used, yes.
This is the hardest demonstration and it decides most files. Article 1726 speaks of property free of latent defects at the time of the sale. You therefore have to tie today's problem to a condition that already existed on the date of the deed. That is exactly what a building expert goes looking for: the nature of the material, the age of the work, the rate at which the damage progressed, traces of earlier repairs.
Article 1726 excludes any latent defect known to the buyer. If the seller disclosed it, if the report flagged it, if an email shows you discussed it, the warranty no longer applies to that specific point. That is why the declarations by the seller form is the first document anyone pulls out.
Repairing before giving notice and documenting. It is human: there is water in the basement, so you call someone. But once the wall is closed, nobody can assess the original condition, and the seller can legitimately argue he never had a chance to verify. Absent a real emergency the sequence is always the same: document, give written notice, let the seller look, get an expert report, then repair.
The law does not require one, but anteriority almost always goes through a building expert. Without one, it is your word against the seller's on the most technical question in the file. See the expert report.
Two distinct liabilities can run in parallel: the seller's under the legal warranty, and the inspector's under his service contract. They do not exclude each other. See who pays for a latent defect.
No. The warranty of quality in article 1726 does not depend on the seller's knowledge. His good faith changes the extent of what he owes, not the fact that he owes. See the seller who was unaware.
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.