When you’re injured because someone else was careless, the starting point in British Columbia is that the at-fault party must compensate you for your losses. But BC law also recognizes that more than one person can share responsibility for an accident, including the injured person. This concept is called contributory negligence. It can reduce, but not eliminate, a plaintiff’s damages where their own conduct contributed to the injury.

What is Contributory Negligence?

In BC, the Negligence Act governs contributory negligence. If both the defendant and the plaintiff are at fault, the court must apportion liability between them based on what is fair and reasonable, considering each party’s degree of fault and the causal impact of their conduct. The result is a percentage split (e.g., 75/25 or 60/40). Your total damage is then reduced by your share of fault. For example, if the court assesses your losses at $100,000 but finds you 25% contributorily negligent, your judgment becomes $75,000.

Who has to Prove It?

Contributory negligence is a defence. The defendant must plead it and prove that, on a balance of probabilities, the plaintiff failed to take reasonable care for their own safety and that this failure contributed to the injury. The standard is objective: what would an ordinary, prudent person have done in the circumstances?

How Courts Decide the Split

Apportionment is not a mathematical formula. Judges should look not at causative potency as to how much each party’s conduct actually caused an accident or injury, but to blameworthiness as to the degree each party was at fault. This is done by the Court by attempting to value how far each party fell short of the reasonable standard of care in the circumstances.

A brief example helps. Suppose a store leaves a puddle for hours with no signage and a customer, texting while walking, slips and falls. The occupier’s failure to maintain safe premises may have strong causative potency; the shopper’s inattention may still matter but often to a lesser degree. A court might apportion, say, 80% to the occupier and 20% to the plaintiff or adjust the numbers depending on the evidence (for example the size of the puddle, lighting, warning cones, footwear, etc.).

Contributory Negligence vs. Failure to Mitigate

These concepts are related but distinct. Contributory negligence concerns conduct before or at the time of the accident that helped cause the injury. Failure to mitigate concerns post-accident choices that unreasonably increase losses (e.g., refusing reasonable treatment or rehabilitation).

A plaintiff can face both reductions: one to reflect pre-accident fault and another to trim damages for avoidable post-accident loss.

Children and Vulnerable Plaintiffs

The standard of care in most instances is that of an ordinary person, but that standard can be adapted for children and others whose capacities differ from a typical adult.

Courts calibrate the “reasonable person” standard for children and others with diminished capacity. A child isn’t expected to exercise adult judgment, and drivers and occupiers often owe heightened vigilance when children are foreseeable users of a space.

This type of calibration may seem straightforward in principle; however, in application, it can often be a difficult task.

Can Contributory Negligence Defeat the Claim Entirely?

Usually, no. In BC, contributory negligence reduces damages rather than barring recovery. A complete bar arises only in rare circumstances (e.g., true volenti non fit injuria, where the plaintiff freely and fully accepted the risk, which is a high threshold that almost never practically arises), or where legislation provides immunity. In most cases, even a plaintiff found more at fault than the defendant still recovers the defendant’s share (e.g., 60% plaintiff / 40% defendant yields 40% of proven damages).

Strategy for Plaintiffs (and Defendants)

As with all cases, if you want to prove or disprove contributory negligence, there are simple steps you can take, including:

• Acting early by preserving evidence immediately, taking photos and videos of any hazards before they are fixed, snow melts, or signage is moved;
• Owning the narrative by gathering proof that your conduct was reasonable in the context;
• Have an explanation for any split-second judgments (e.g., evasive action), and emphasize the emergency context rather than neat hindsight analysis; and
• For defendants. plead contributory negligence with particulars, disclose the records you’ll rely on, and marshal expert evidence on causation and injury exacerbation.

Experienced Negligence Lawyers

Contributory negligence in BC is about proportionate responsibility. It doesn’t operate to erase a valid claim; it simply calibrates compensation to reflect each party’s role. Outcomes with respect to contributory negligence can turn on granular facts and persuasive evidence, early advice and targeted investigation can make a meaningful difference to the final apportionment, and the dollars at stake.

If you have a case that deals with contributory negligence, contact the experienced negligence lawyers at Taylor & Blair LLP today to schedule a consultation.