CanadaCan I sue a builder if a construction defect makes my building dangerous?
Yes, you can sue a builder in Canada for a dangerous construction defect — courts recognize a duty of care to prevent harm, and repair costs to eliminate danger are recoverable even if no physical injury has yet occurred.
What the Law Says
While there is no single federal statute governing construction defect liability in Canada, provincial laws on negligence, contract, and consumer protection apply. The foundational legal principle comes from common law — specifically, the duty of care owed by builders to ensure structures are safe for occupation.
Builders in Canada owe a duty of care under tort law to avoid creating dangers to people or property. This duty arises from the foreseeability of harm and the relationship between builder and owner or occupier.
Although pure economic loss (e.g., lost profits or diminished value alone) is generally not recoverable in negligence, an important exception exists when the defect poses a real danger to persons or property.
In such cases, the cost of repairs necessary to remove that danger is considered a recoverable head of damages — not as economic loss, but as compensation for preventing imminent physical harm.
What Courts Have Said
The Supreme Court of Canada established a critical exception to the general rule against recovering pure economic loss in construction defect cases — where danger is present, repair costs are compensable.
The Court held that a contractor can be held liable in negligence for the cost of repairing a dangerous defect — even without personal injury or property damage having yet occurred — because the risk of imminent harm transforms the loss into a recoverable physical danger avoidance expense.
What to Do
Document the defect thoroughly — take photos, videos, and written notes describing the danger (e.g., structural cracks, failing supports, fire safety failures).
Obtain a professional engineering or building inspection report confirming the defect is dangerous.
Notify the builder in writing, specifying the defect and requesting remediation within a reasonable time.
If the builder refuses or fails to act, consult a lawyer experienced in construction litigation to assess your claim — especially whether the defect creates a foreseeable risk of harm.
File a claim in court (usually provincial superior court) within the applicable limitation period — typically 2 years from discovery in most provinces, but confirm with local law.
Sources
Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: 2026-06-08.