What Are Material Latent Defects in Alberta Real Estate?

Short answer

A material latent defect is a serious hidden problem with a property that:

was not reasonably discoverable before closing;
materially affects the property’s safety, habitability, structure, value, or use; and
was known to the seller, actively concealed, misrepresented, or subject to the seller’s reckless disregard.

Alberta real estate transactions generally follow the principle of caveat emptor, or “buyer beware.” However, that principle does not protect a seller who fails to disclose a serious hidden defect in circumstances that create a duty to disclose. (Lewis v Plourde, 2017 ABQB 235 (CanLII), [191])

What is a latent defect?

A latent defect is a defect that an ordinary purchaser could not identify through reasonable inspection and inquiries before entering into the purchase contract. A defect may remain latent even if a qualified expert could find it through specialized testing or invasive investigation. (Temple v. Thomas, 2007 ABQB 316 (CanLII), [52])

By contrast, a patent defect is visible or reasonably discoverable through ordinary inspection, reasonable inquiries, or appropriate professional investigation. (Kent v MacDonald, 2021 ABCA 196 (CanLII), [45]; Lewis v Plourde, [195])

For example, visible foundation cracking, water staining, or other warning signs may make an underlying problem patent if they should reasonably prompt further investigation. (Kent v MacDonald, [46]) However, visible water entry does not necessarily reveal hidden waterproofing, membrane, or building-envelope defects that require specialized knowledge or destructive testing. (Dyte v Total Point Developments Inc, 2025 ABKB 530 (CanLII), [257])

What makes a latent defect “material”?

Alberta decisions generally focus on whether the defect is serious enough to make the property dangerous, potentially dangerous, unfit for habitation, or substantially interfere with the use, occupation, or enjoyment of a meaningful part of the property. (Lewis v Plourde, [202]; Gibb v. Sprague, 2008 ABQB 298 (CanLII), [44])

Material latent defects may involve:

significant foundation movement or structural deterioration;
concealed water infiltration, mould, or rot;
unsafe electrical, heating, plumbing, or gas systems;
defective building-envelope or waterproofing work;
hidden renovation problems;
contamination or environmental conditions; and
missing occupancy permits where the absence of permits is connected to serious hidden construction or safety problems.

In Slevinsky v Chambul Estate, 2014 ABQB 680 (CanLII), concealed foundation damage was treated as a latent defect because the foundation was hidden behind finished walls and could only be inspected through invasive work. The seller knew about foundation cracks and failed to disclose them. (Slevinsky v Chambul Estate, [73])

In Temple v. Thomas, extensive electrical, plumbing, heating, and gas-related problems were latent because they were not identified during the ordinary inspection. The property’s condition also substantially interfered with the purchaser’s use and enjoyment of the home. (Temple v. Thomas, [50])

Examples of material latent defects

Hidden foundation problems

A foundation defect may be latent where it is concealed behind drywall, insulation, panelling, decking, or other finishing materials. Active concealment can remove the seller’s protection under caveat emptor. (Slevinsky v Chambul Estate, [78])

However, a defect may be considered patent where visible cracking, spalling, moisture, or other warning signs would have prompted a reasonable purchaser to investigate further. (Belzil v. Bain, 2001 ABQB 890 (CanLII), [56])

Concealed water, mould, and building-envelope problems

Water entry visible during a viewing may be a patent condition, but the hidden cause of the water entry may remain latent. In Dyte v Total Point Developments Inc, underlying window, EIFS, balcony, roof, membrane, and waterproofing defects were not reasonably discoverable through ordinary visual inspection. (Dyte v Total Point Developments Inc, [257])

Similarly, mould concealed behind baseboards and drywall was treated as latent where it could not be discovered without removing those materials. (Gibb v. Sprague, [21], [29])

Unpermitted renovations

The absence of permits is not automatically a defect. In Lewis v Plourde, the court found that the lack of permits itself was not necessarily a defect, but it could indicate that the seller was reckless about hidden safety and construction problems. (Lewis v Plourde, [217])

Unpermitted renovations may become important where the work creates hidden electrical, heating, structural, or foundation problems. In that situation, a seller may have a duty to disclose the renovation history and related risks. (Lewis v Plourde, [230]; Temple v. Thomas, [53])

Environmental contamination

Contamination may be treated as a latent defect where the purchaser receives incomplete or misleading information about the property’s environmental condition. A seller who represents that property has been remediated while withholding information showing that further remediation is required may be unable to rely on caveat emptor or an entire-agreement clause. (1234389 Alberta Ltd v 606935 Alberta Ltd, 2020 ABQB 28 (CanLII), [113], [128], [190])

What must a buyer prove?

A purchaser claiming that a seller failed to disclose a material latent defect generally must establish:

there was a defect;
the defect was latent;
the seller knew of it or was reckless as to whether it existed;
the defect made the property dangerous, potentially dangerous, or unfit for habitation; and
the purchaser relied on the seller’s representation, silence, or concealment. (Lewis v Plourde, [208]; Dyte v Total Point Developments Inc, [236])

The purchaser must also show that the defect was not something reasonable inspection and inquiry should have uncovered. A failure to obtain an inspection does not automatically make an obvious defect latent. (Cardwell v. Perthen, 2007 BCCA 313 (CanLII), [44])

Seller knowledge and reckless conduct

Actual knowledge is not always required. A seller may be responsible where their conduct was reckless as to whether a material latent defect existed.

For example, failing to obtain permits, failing to supervise extensive renovations, and failing to investigate serious construction concerns may amount to recklessness. (Temple v. Thomas, [53]) Similarly, a seller who knows about foundation cracks but does not follow recommended remedial work may be found to have knowledge of, or be reckless about, the underlying defect. (Slevinsky v Chambul Estate, [78])

Silence, half-truths, and incomplete answers can also amount to misrepresentation where the seller knows of a serious hidden problem. (Lewis v Plourde, [240]; 1234389 Alberta Ltd v 606935 Alberta Ltd, [124])

What if the purchase agreement says “as is”?

An “as is” clause or exclusionary provision does not necessarily protect a seller from liability for fraud, active concealment, or fraudulent misrepresentation. Fraudulent misrepresentation may also prevent a seller from relying on an entire-agreement clause. (Slevinsky v Chambul Estate, [68], [87]; 1234389 Alberta Ltd v 606935 Alberta Ltd, [190])

However, contractual wording remains important. Where the purchaser knew of a risk and the agreement expressly allocated that risk to the purchaser, the contractual terms may govern. (Motkoski Holdings Ltd. v. Yellowhead (County), 2010 ABCA 72 (CanLII), [57], [67], [112])

What should buyers and sellers preserve?

Potential evidence may include:

inspection reports;
photographs and videos;
disclosure statements;
listing materials;
emails and text messages;
contractor, engineer, or environmental reports;
permit and occupancy records;
repair estimates;
records of previous leaks, flooding, or renovations; and
a timeline showing when the problem was discovered and what happened afterward.

These records can help determine whether the defect was hidden, whether the seller knew or was reckless, whether the buyer relied on the available information, and what losses resulted.

What this means practically

A material latent defect is not simply an expensive repair or an unpleasant surprise. The issue is whether the problem was genuinely hidden, materially affected the property, and falls within an exception to caveat emptor.

Visible defects, warning signs, and information disclosed before closing may make a claim more difficult. Conversely, concealed structural problems, hidden water damage, unsafe renovations, and misleading environmental or permit information may support a claim where the seller knew of the issue or acted recklessly.

If you are dealing with a suspected hidden defect in an Alberta property, speaking with an Alberta real estate lawyer can help assess the purchase contract, available evidence, seller disclosures, inspection history, and potential remedies.

This article provides general information and is not legal advice.

Berjak Law

10080 Jasper Avenue, Suite 301
Edmonton, Alberta

780-879-0200

What Are Material Latent Defects in Alberta Real Estate?