Do Canadians have to be “reasonable” against home intruders?

 Dear friends,

 

I hope you didn’t find yourself in this kind of conversation yesterday:

 

A: “Did you hear there was a shooting in the U.S.?”
B: “Yes, but there was one in Gordon Head too—look it up…”

 

We just heard about the recent Lindsay, Ontario case that has sparked a firestorm of public reaction. Around 3 a.m., a resident awoke to an intruder—allegedly armed with a crossbow—allegedly had entered through the window of his daughter’s room (fortunately, she was not there at the time). The resident confronted him, leaving the intruder with life-threatening injuries, only to be charged with aggravated assault and assault with a weapon.

 

Do Canadians have to be “reasonable” against home intruders?

Short answer: Yes. In Canada there’s no automatic “castle doctrine” immunity. If you use force against an intruder, the Criminal Code asks one central question: were your actions reasonable in the circumstances?

The law in one page

Self-defence (people): You’re not guilty if you (a) believed on reasonable grounds there was force or a threat, (b) acted to protect yourself or someone else, and (c) what you did was reasonable in the circumstances. Courts must weigh factors like imminence, available alternatives (including retreat if safely possible), presence of weapons, your size/abilities, and your role in the incident. There’s no strict duty to retreat, but whether you could have is a factor.

Defence of property (your home): You can act to prevent or end unlawful entry, remove a trespasser, or stop damage—but again your response must be reasonable. Critically, Canadian courts have been clear: deadly force is not reasonable to defend property alone (it may be justified only where there’s also a genuine threat to life or grievous harm).

Citizen’s arrest & necessary force: An owner/occupier may arrest someone found committing an offence on/against their property (s. 494), but only as much force as necessary may be used to carry that out (s. 25). Government guidance also warns you’re not entitled to use excessive force when making a citizen’s arrest.

Recent examples (why “reasonable” decides outcomes)

• Lindsay, Ontario (Aug 2025): A resident woke to a man inside his apartment. After an altercation leaving the intruder with life-threatening injuries, police charged the resident with aggravated assault. Police emphasized courts would assess reasonableness; the intruder also faces serious charges. (This case is before the courts.)
• Milton, Ontario (Feb–Jul 2023): A homeowner shot an armed intruder inside his home. The Crown later withdrew the second-degree murder charge, saying there was no reasonable prospect of conviction—an example where the facts supported self-defence.
• R. v. Khill (Hamilton driveway, 2016–2025): A homeowner shot a man he believed was stealing his truck. The Supreme Court said juries must consider the accused’s role in the incident when judging reasonableness; on retrial he was convicted of manslaughter (not murder). In 2025, the Supreme Court declined to hear his appeal; his sentence stands (reduced on appeal to six years due to a sentencing error). This shows that even on your property, lethal force can be unreasonable depending on the circumstances.

What “reasonable” usually looks like

• Proportionate: Force that matches the threat (e.g., restraining or pushing someone out vs. using a weapon when no grievous threat exists).
• Defensive purpose: Acting to stop a threat, not to punish, chase, or retaliate.
• Situational: Time of night, surprise, presence of others (kids/elderly), weapons, and your own abilities all matter.
• Alternatives considered: You don’t have to flee, but if safe options existed (closing a locked door, calling 911), juries can weigh that.

Bottom line: Canadians can defend themselves and their families at home, but every case turns on reasonableness—not slogans. There’s no blanket immunity, and lethal force is justified only where you reasonably believe it’s necessary to prevent death or grievous harm.