Check your strata bylaws for any rules about uses of common property. For example, your building may not allow storage of personal items in common areas for safety reasons.
If your neighbour’s belongings are interfering with your ability to get into your home, tell your neighbour and ask them to move their things. You can refer your neighbour to your strata’s bylaws.
If that doesn’t work, you can write a letter to your strata council. In your letter, describe your complaint. Explain your concerns and give evidence of the problem you have with your neighbour. Describe how you’ve tried to resolve the matter with the neighbour and what outcome you’re seeking with their help.
The strata council must investigate and respond to bylaw complaints. If the strata ultimately finds that a bylaw or rule has been broken, they could give your neighbour a warning or a fine (up to $200). Or, the strata could do what is reasonably necessary to resolve the problem and then ask your neighbour to pay for the reasonable costs of doing so.