Until changes to the labour code in 2019, which came into force a year or two years later through what was known as Bill C-65, which made applicable amendments to what we call PESRA, the Parliamentary Employment and Staff Relations Act, prior to these amendments the health and safety provisions of the labour code were not applicable to Parliament as a workplace. That said, there were provisions and policies in place at the administration level, but there was no specific legal requirement except the general legal requirements of employers.
On May 28th, 2024. See this statement in context.