Abstract: A motorized lock assembly and a method of motorizing a lock installed in a door. The motorized lock assembly including a motorized drive assembly to be mounted to an interior side of the door in driving engagement with a bolt assembly of the lock in place of a thumb turn of the lock. The motorized lock assembly also including a communications assembly to receive an instruction from a user and to direct an operation of the motorized drive assembly in response to the instruction from the user. The lock motorized by accessing a bolt assembly of a lock installed within a door through a thumb turn opening in the door, attaching a drive shaft of a motorized drive assembly to the bolt assembly in driving engagement with the bolt assembly, and attaching the motorized drive assembly to the interior side of the door.