Courts in BC require clear evidence that a party knowingly gave up its right before finding a waiver. Contracts usually include a non waiver clause stating that waiving one breach is not a waiver of any other breach, and that waivers must be in writing.
If you accept late or incomplete performance, say in writing that you reserve your rights.
Repeatedly accepting late payments without reserving rights can make it harder to enforce strict deadlines later.
For the full explanation, see our entry on Waiver.
General information about British Columbia and Canadian law, current to October 2026. It is not legal advice.