Can the tenant change the locks without telling the owners?

Answer:

According to the Landlord and Tenant Board:
"A tenant cannot change the locks unless the landlord agrees. Also, the tenant cannot add locks that might stop a landlord from entering the unit if there is an emergency or if the landlord has a valid reason for entering the rental unit and the landlord has given the tenant proper notice to enter. If the tenant does change the lock, a copy of the key should be given to the landlord immediately."

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