Canada has no “Stand Your Ground” law and no Castle Doctrine giving you an automatic right to use force, let alone serious force, against someone in your home. Under Criminal Code section 34, your response is only lawful if you reasonably believed force was being used or threatened against you, you acted for the purpose of defending yourself, and your response was reasonable in the circumstances, which includes stopping once the threat has actually ended.
This is general legal information, not legal advice for a specific situation. Self-defence cases are highly fact-specific. If you’ve ever injured someone in a defensive situation, contact a criminal defence lawyer immediately, and avoid giving a detailed statement to police before you’ve spoken with counsel.
Canada has no Castle Doctrine, and no automatic right to use force
Some countries and US states have laws that presume force is justified simply because someone is inside your home. Canada doesn’t work that way. Per the Department of Justice’s own technical guide to the self-defence reforms, Canadian law asks a factual question in every case: given what actually happened, was this specific response reasonable? There’s no legal shortcut that skips that analysis just because the confrontation happened inside your own house.
The actual test: Criminal Code section 34
Section 34 of the Criminal Code sets out three things that all have to be true for self-defence to apply:
- You reasonably believed force was being used against you (or someone else), or that force was being threatened.
- Your act was for the purpose of defending yourself or the other person, not retaliation or punishment.
- Your response was reasonable in the circumstances.
That third element is assessed against a list of factors set out in section 34(2), including: the nature of the force or threat, how imminent it was, whether other ways of responding were available, your own role in how the incident unfolded, whether anyone used or threatened a weapon, the relative size, age, and physical capabilities of the people involved, and whether your response was proportionate to the threat you actually faced.
Notice that “other ways of responding were available” is one factor among several, not an absolute duty to retreat. Canadian law doesn’t require you to try to flee your own home before defending yourself, but a court can still weigh whether retreating, de-escalating, or simply calling police was realistically available to you when deciding whether your specific response was reasonable.
The trap: using force after the threat has already retreated
This is where home defence cases most often go wrong. Self-defence exists to stop a threat that’s actually happening, not to punish someone after they’ve disengaged. In R. v. Khill, the Supreme Court of Canada examined in detail how a person’s own conduct in approaching or escalating a confrontation factors into whether their later use of force was reasonable. The clearest version of this trap: if an intruder is fleeing and you pursue and injure them, the law generally treats you as having become the aggressor at that point, even if the intruder was clearly in the wrong moments earlier. Once someone is retreating, the immediate threat has ended, and using force at that point is far harder to justify as defensive.
Defence of property is narrower than defence of yourself
Section 35 of the Criminal Code covers defending property you’re in peaceable possession of, letting you act to prevent someone from entering, to remove them, or to stop them from taking or damaging the property. But this defence is narrower than self-defence: it justifies reasonable steps to remove or prevent, not serious bodily harm as a response to a property threat alone. If the situation escalates so that you reasonably believe you or someone else is now facing actual force or a threat of force, it’s section 34’s self-defence test, not property defence, that governs how much force is justified, and the same reasonableness and proportionality limits still apply.
What this looks like in practice
- If you hear an intruder, prioritize getting your family somewhere safe and calling 911 over confronting them directly.
- A verbal warning that police are coming, combined with giving the intruder a clear path to leave, is a strong, low-risk response.
- If the intruder is retreating or fleeing, let them go. Pursuing them turns you into the one initiating force at that point.
- Stop using force the moment the threat is no longer active, not once you feel it’s been sufficiently punished.
- If anyone is injured, including the intruder, contact a criminal defence lawyer before giving a detailed statement to police.