Do not change the lock through the property.

Legal analysis: If the house has been handed over, then you have the ownership of the house and can change the lock yourself.

Legal basis: Article 2 of the Regulations on Property Management The term "property management" as mentioned in these Regulations refers to the activities that the owner selects a property service enterprise, and the owner and the property service enterprise repair, maintain and manage the house, supporting facilities and related sites in accordance with the property service contract, so as to maintain the environmental sanitation and related order in the property management area.