Hidden Defects in Quebec: Conditions, Remedies and Steps

A hidden defect (vice caché), also called a latent defect, is a serious problem that already existed when a property was sold, that the buyer did not know about and could not spot with a careful inspection. In Quebec, most sellers are bound by the legal warranty of quality in the Civil Code, so if your house has a hidden defect you may have a claim against the seller. The catch is that you have to follow the right steps, and quickly. Here is how hidden defects work in Quebec, in plain terms, whether you are buying or selling.

What is a hidden defect under the Civil Code of Québec?

The Civil Code of Québec requires the seller to warrant that the property is free of latent defects that make it unfit for its intended use, or that reduce its usefulness so much that the buyer would not have bought it, or would not have paid so much, had they known. This is the legal warranty of quality (articles 1726 and following).

The warranty applies even if the contract says nothing about it. It protects the buyer of a house, condo or plex, whether or not the seller knew about the problem.

The four conditions of a hidden defect

For a problem to count as a hidden defect, four conditions generally have to be met:

• It is serious: it seriously affects the use or value of the home. A minor flaw or the normal wear of an older building is not enough.
• It is hidden: it was not apparent at the time of the purchase.
• It was unknown to the buyer: you did not know about it and no one disclosed it to you.
• It existed before the sale: the problem, or its cause, was already there when the property was sold, even if it only showed up later.

Apparent defect vs hidden defect

An apparent defect is one that a prudent and diligent buyer could have noticed through a careful examination, without needing an expert. The seller does not have to warrant an apparent defect, or one the buyer already knew about.

This is why the pre-purchase inspection matters so much. If you see warning signs, such as water stains, cracks or a damp smell, you are expected to look further. Ignoring a red flag can cost you the protection of the warranty.

Can a house be sold without a legal warranty in Quebec?

Yes. A property can be sold "without legal warranty" or "at the buyer's risk" (sans garantie légale). This is common in estate sales and repossessions. In that case, the buyer generally gives up their hidden-defect claims.

There is an important limit: a seller cannot escape liability for a defect they knew about, or could not have been unaware of, and did not disclose. The exclusion does not protect a seller acting in bad faith. As a buyer, read the clause carefully before signing at the notary; as a seller, disclose what you know.

What to do if you find a hidden defect

Found a problem after moving in? The order of your steps matters as much as the defect itself.

• 1. Document the defect. Take dated photos and videos, keep invoices, and have the problem assessed by an expert such as a building inspector or engineer.
• 2. Notify the seller in writing. You must give the seller written notice within a reasonable time after discovering the defect. This is the notice of denunciation. It describes the problem and invites the seller to come and see it.
• 3. Let the seller inspect before repairs. Except in an emergency, such as active water infiltration, do not start the work until the seller has had a chance to see the defect. Repairing too soon can weaken your claim.
• 4. Send a formal demand. If the seller does nothing, a mise en demeure (demand letter) formally asks them to act before you go to court.
• 5. Negotiate or try mediation. Many disputes settle at this stage, which avoids the cost and delays of a trial.
• 6. File a claim. Smaller claims go to the Small Claims Division of the Court of Québec; larger ones go to the Court of Québec or the Superior Court, depending on the amount at stake.

Watch the deadlines: the claim is subject to prescription, and late notice to the seller can cost you your rights. Act as soon as you discover the defect.

What remedies are available?

Depending on how serious the defect is, the buyer may ask for:

• a reduction of the sale price;
• the cost of repairs;
• cancellation of the sale, in the most serious cases;
• additional damages, if the seller knew about the defect or could not have been unaware of it.

A seller who did not know about the defect is still generally bound by the warranty, but their liability is more limited than that of a seller who knew.

Common examples of hidden defects

• water infiltration in the basement or through the roof;
• significant foundation cracks;
• pyrite or problem backfill under the concrete slab;
• hidden mould in the walls or attic;
• a defective roof;
• a non-compliant or failing septic system.

Every case comes down to evidence: the same problem can be a hidden defect in one house and an apparent one in another.

The role of inspectors, notaries and brokers

A building inspector examines the house before the purchase and points out signs of trouble; their report helps show what was apparent. The notary receives the deed of sale and can explain its clauses, including any warranty exclusion. A real estate broker guides the transaction and makes sure the seller fills out their declarations about the property.

For a new home bought from a builder, the guarantee plan for new residential buildings is a separate track with its own rules.

When to get a lawyer for a hidden defect

A real estate lawyer can help you assess whether the four conditions are met, draft the notice of denunciation, prepare the demand letter and choose the right court. The same goes for a seller defending against a claim. Get advice early, ideally before any repairs.

To prepare for the consultation, bring:

• the deed of sale and the promise to purchase;
• the seller's declarations and the pre-purchase inspection report;
• photos, videos and expert reports on the defect;
• your exchanges with the seller, including the notice of denunciation.

To understand your rights before the meeting, Éducaloi explains the rules on sales and the warranty of quality in plain language.

Compare and book on JustiConnect

JustiConnect lets you compare lawyers, see their availability and book a consultation online. Start with the residential real estate lawyers page, or browse all real estate lawyers. You can also search residential real estate lawyers by city. If your dispute is more broadly about a contract, civil law lawyers can also advise you.

Frequently asked questions

Is it possible to buy a house without a legal warranty?

Yes. You accept the risk of defects you could not see, but the seller still cannot hide a defect they knew about. Read the clause with your notary before signing.

What counts as a latent defect?

A defect that is serious, hidden, unknown to the buyer and present before the sale. Water infiltration, foundation problems, pyrite and hidden mould are common examples, but each case depends on the evidence.

How long do I have to act on a hidden defect in Quebec?

You must notify the seller in writing within a reasonable time after discovering the defect, then file your claim before the prescription period runs out. These delays depend on the facts, so a lawyer can tell you where you stand.

Is a latent defect the same as a hidden defect?

Yes. In Quebec, "latent defect" is the term used in the English version of the Civil Code, and "hidden defect" is a common translation of vice caché. Both refer to the same legal warranty.