Latent Defects

What are latent defects in real estate?

Latent defects are hidden problems with a property that a reasonable buyer would not discover on a normal inspection but that the seller knows or ought to know about. Examples include a basement that floods every spring, a foundation crack covered by drywall, a roof that leaks only in heavy rain, and a former grow-op or meth-lab history. Latent defects sit at the boundary of caveat emptor: the buyer is otherwise responsible for due diligence, but a seller who knows of a hidden defect that makes the property dangerous or unfit for habitation has a duty to disclose it.

How latent defects differ from patent defects

The distinction is exam-tested and high-stakes:

A defect can shift between categories depending on the inspection method. A small foundation crack hidden by drywall is latent; the same crack visible from the unfinished side is patent.

When the duty to disclose triggers

Three conditions must align for a seller's disclosure duty to apply:

1. Knowledge — the seller actually knows or reasonably should know about the defect
2. Hidden nature — the defect would not be discovered on a reasonable inspection by a prudent buyer
3. Materiality — the defect renders the property dangerous or unfit for the intended use, or materially affects value

If any condition is missing, the duty does not strictly arise. But the registrant still has a parallel obligation under the Code of Ethics (no concealment of pertinent facts), which is broader than the seller's civil disclosure duty.

A scenario the exam likes to test

A seller knows the home has had ongoing water infiltration into the basement during heavy rainfall for three years. The sump pump runs constantly during spring storms. The seller dries the basement before showings, repaints affected drywall, and does not mention the issue. The buyer closes in February (dry season) and the basement floods in April.

The buyer's claim succeeds because:

1. The seller knew (running the sump pump, repainting are evidence of knowledge)
2. The defect was hidden (dry basement at showing, fresh paint)
3. It is material (recurring water infiltration affects habitability)

If a registrant on the seller's side knew of the issue and did not disclose, RECO can find a Code of Ethics breach independent of any civil action against the seller. Registrant liability and seller liability run in parallel — both can apply to the same fact pattern.

How registrants protect against latent-defect claims

• Ask sellers in writing about flooding, prior insurance claims, structural repairs, mould, grow-op history, and any prior insurance coverage denials
• Document the seller's answers in writing — a properly completed Seller Property Information Statement (SPIS) is one defence, but SPIS forms have their own liability surface and many lawyers recommend against using them
• If the seller refuses to answer, document the refusal
• Disclose anything you know to the buyer in writing — the registrant's "concealment of pertinent facts" duty is broader than the seller's civil duty

Where this appears in your Humber program

Latent defects are core content in Course 2: Residential Transactions under property condition and disclosure modules, and reappear in continuing-education content on the registrant's overlapping Code of Ethics duties. The patent-vs-latent distinction is among the most heavily tested exam topics.

Frequently asked questions

What are examples of latent defects in real estate?

Examples of latent defects include recurring basement flooding that is dry on the day of the showing, mould inside walls behind drywall, foundation cracks hidden by finishing, leaky roofs that only show in heavy rain, asbestos in older insulation, buried oil tanks, and unpermitted renovations. The common thread is that none of these would be discovered on a normal walkthrough or by a typical home inspection.

Does a seller have to disclose a latent defect in Ontario?

A seller in Ontario must disclose a known latent defect if it makes the property dangerous or unfit for habitation. The duty is triggered by three conditions: the seller knows or ought to know about the defect, the defect is hidden and not reasonably discoverable, and it is material. If any condition is missing, the duty does not strictly apply — though the registrant still has a parallel Code of Ethics duty against concealment of pertinent facts.

Can I sue for a latent defect after closing?

Yes. A buyer who discovers a material latent defect after closing can sue the seller for non-disclosure if they can prove the seller knew about it and failed to disclose. Successful claims usually require evidence of the seller's knowledge — sump pump receipts, prior insurance claims, contractor reports, or witness statements. The registrant on the seller's side can also be named separately if they knew and did not disclose.

What is the difference between a latent defect and a material latent defect?

A latent defect is any hidden defect not discoverable on reasonable inspection. A material latent defect is a hidden defect significant enough to affect the property's habitability, safety, or value materially. The disclosure duty applies to material latent defects — not every hidden flaw triggers it. The line of materiality is fact-specific, but recurring water infiltration, structural issues, and known contamination are almost always material.

Practice this topic

ExamAce covers latent-defect scenarios in the Course 2 question bank, with patent-vs-latent classification drills and Code of Ethics overlap questions in every simulation paper.