What is a material latent defect and do I have to disclose it?
A material latent defect is a hidden defect that a seller knows about, that a buyer could not reasonably discover during inspection, and that is significant enough to affect the buyer’s purchase decision or the price they would pay. In Alberta, BC, and Ontario, sellers are legally required to disclose material latent defects. Failure to disclose can result in legal action, damages, and in some cases rescission of the sale after closing.
1 The Definition
Latent versus patent: the distinction that matters
Canadian real estate law draws a clear line between two categories of defects. Understanding which side a known problem falls on determines your disclosure obligation.
A latent defect becomes a material latent defect when it is significant enough that a reasonable buyer would consider it in their decision to purchase or in what they would pay. Not every hidden defect is material. But sellers do not get to decide unilaterally that something is not material. When in doubt, disclose and let your lawyer advise.
Patent defect
Latent defect
Visible and discoverable during a reasonable inspection. Buyers can see it or a home inspector would find it.
Examples: cracked ceiling, old carpet, peeling paint, an obviously leaking tap, a window that does not close properly.
Hidden and not discoverable during a reasonable inspection. The problem exists but cannot be seen without opening walls, excavating, or specialised testing.
Examples: foundation cracking hidden behind a finished basement, a remediated mold problem behind drywall, an underground oil tank.
Sellers generally do not need to disclose patent defects. Buyers and their inspectors are expected to identify what is visible. This is not a reason to conceal known problems or to avoid reasonable access during inspection.
Sellers must disclose material latent defects they are aware of. The standard is knowledge: if you know about it and a buyer could not reasonably find it, disclose it. Deliberate concealment increases your legal exposure significantly.
2 Your Disclosure Obligation
The Property Disclosure Statement and what it does not cover
In Alberta and BC, sellers of residential property complete a Property Disclosure Statement (PDS). In Ontario, the equivalent is the Seller Property Information Statement (SPIS), which is not legally mandatory but is standard practice in most transactions. These forms ask sellers to declare known defects, water damage history, unpermitted work, and other material conditions.
Completing the PDS or SPIS does not replace your obligation to proactively disclose material latent defects. If you know about a defect and tick “no” on the relevant question, or simply leave it off, completing the form does not protect you from liability. The obligation is to disclose what you know. The form is the mechanism, not the limit of your duty.
Your real estate lawyer reviews the completed disclosure as part of the closing process and can advise on whether a known condition requires disclosure. Legal fees are paid directly to your lawyer. Bōde’s Pro Marketplace connects sellers with vetted real estate lawyers in Alberta, BC, and Ontario.
3 Common Examples
What typically qualifies as a material latent defect
The following categories represent the most common sources of material latent defects in Canadian residential transactions. The list is not exhaustive. If you have a known issue that fits the general definition, discuss it with your lawyer before assuming it does not need to be disclosed.
Foundation and structural defects
Cracks in the foundation, lateral movement, soil settlement, or structural issues hidden behind a finished basement or exterior cladding. These are among the highest-value disclosure items because the remediation cost is significant and buyers cannot assess them without invasive inspection.
Water damage and mold history
A history of flooding, moisture intrusion, or mold remediation must be disclosed even if the problem has been fixed. The disclosure is about what you know happened, not only about what currently exists. A buyer who discovers a remediated mold problem after closing that you did not disclose has legal grounds to pursue you.
Environmental and hazardous materials
Asbestos in insulation, flooring, or ceiling tiles (common in homes built before 1990), lead paint (pre-1978 construction), and urea-formaldehyde foam insulation (UFFI, commonly installed in the 1970s) are material latent defects if you know they are present. A buyer cannot identify these through visual inspection alone.
Unpermitted or non-code work
Additions, suites, electrical panels, or structural modifications completed without permits, or completed to a standard that does not meet code, are typically material latent defects. This is especially important for secondary suites. A suite described as legal but built without permits is a disclosure issue with significant legal exposure.
Underground fuel storage tanks
Decommissioned oil or fuel tanks buried on the property must be disclosed if you know they exist, even if they were properly decommissioned. An undisclosed tank discovered after closing triggers remediation cost liability and can invalidate title insurance. Confirmation of decommissioning by a qualified contractor should be available if you have it.
4 The Consequences
What buyers can do when sellers do not disclose
Discovery of an undisclosed material latent defect after closing gives a buyer legal recourse. The most common outcomes are a claim for damages (the cost of remediation or the reduction in the property’s value caused by the defect), or in more serious cases, a claim for rescission that seeks to unwind the entire transaction.
The burden of proof falls on the buyer to demonstrate that the defect was material, that it was latent, and that the seller knew about it. Sellers who can show they genuinely did not know about a defect are in a different legal position than those who actively concealed one. Deliberate concealment carries the highest risk.
Disclosure protects you as much as it protects the buyer. A well-documented disclosure history reduces your post-sale legal exposure. A known defect disclosed upfront, priced into the sale, is a much lower-risk position than the same defect discovered after keys change hands.
5 Before You List
Four steps to handle disclosure correctly
Disclosure done correctly happens before listing, not after receiving an offer. An offer-stage disclosure creates renegotiation risk and signals to the buyer that you withheld something.
Complete the Property Disclosure Statement thoroughly
In Alberta and BC, the PDS is a required document. In Ontario, the SPIS is strongly advised. Work through every question carefully. If a question is unclear, answer based on your best knowledge and note any uncertainty. Your lawyer can review the completed form before listing.
Think about history, not only current condition
The disclosure obligation covers what you know happened, not only what currently exists. A water issue that was repaired five years ago is still disclosable if it was material. Walk through your home thinking about what has been fixed, remediated, or addressed during your ownership.
Pull your permit history before listing
Contact your municipality to request a permit history for your property. This tells you what work was permitted during your ownership and prior ownerships. Unpermitted work discovered through this process should be disclosed. If you purchased the home with a known unpermitted addition, that is a material latent defect you are obligated to disclose.
Consult your lawyer before listing if you have any uncertainty
If you are uncertain whether a known condition is a material latent defect, your lawyer is the right person to advise. This is not a question to leave until after an offer arrives. Bōde’s Pro Marketplace connects you with vetted real estate lawyers in Alberta, BC, and Ontario who can review your disclosure obligations before you list. Legal fees are paid directly to your lawyer.
Common Questions
What is the difference between a latent defect and a patent defect?
A patent defect is visible and discoverable during a reasonable inspection. A cracked wall, worn carpet, or a leaking tap are patent defects. A latent defect is hidden and would not be discovered without opening walls, excavating, or specialised testing. Foundation issues behind a finished basement, mold remediated behind drywall, and underground tanks are latent defects. Sellers generally do not need to disclose patent defects but must disclose material latent defects they are aware of.
Do I have to disclose a problem that was fixed before I listed?
Yes, if the problem was material. The disclosure obligation covers what you know happened, not only what currently exists. A significant water intrusion that was remediated, a foundation crack that was repaired, or a mold problem that was professionally addressed are all disclosable if they were material. Disclose the history and the remediation. Buyers and their lawyers can then evaluate the work that was done.
Does filling out a Property Disclosure Statement protect me from liability?
Completing the PDS or SPIS honestly reduces your liability because it documents what you disclosed. It does not protect you if you answer inaccurately or omit something you knew about. The form is the mechanism for disclosure, not a limit on your legal duty. A buyer who can prove you knew about a defect and either omitted it from the form or answered a related question dishonestly has legal recourse regardless of the form being completed.
What happens if a buyer finds an undisclosed defect after closing?
The buyer can pursue a claim for damages: the cost of remediation or the reduction in the property’s value caused by the defect. In serious cases, they can seek rescission, which attempts to unwind the entire sale. The buyer must demonstrate that the defect was material, that it was latent, and that the seller knew about it. Deliberate concealment carries higher legal risk than a genuine omission. Consult a lawyer immediately if you become aware of a post-closing claim.
Is a death in my home a material latent defect I must disclose?
In most Canadian provinces, a death in a home is considered a stigmatized property issue, not a material latent defect in the physical sense. There is no universal obligation to disclose a death, but some provinces have specific rules, and your obligations may differ depending on the nature of the death and local law. Consult your lawyer for guidance specific to your province and circumstances.
Is the Seller Property Information Statement mandatory in Ontario?
No. The SPIS is not legally required in Ontario, unlike the Property Disclosure Statement in Alberta and BC. However, Ontario sellers still carry a common law duty to disclose material latent defects they are aware of. Most Ontario transactions proceed with a completed SPIS as a matter of practice, and declining to provide one can itself create questions for buyers. Consult your lawyer about whether completing an SPIS is advisable in your specific transaction.
This post provides general educational information about seller disclosure obligations in Canada. It is not legal advice. Disclosure requirements, definitions, and legal consequences vary by province, by property type, and by the specific facts of each transaction. Consult a qualified real estate lawyer before listing your home if you have questions about your disclosure obligations.