The property changed the lock of the owner's house without permission.

Legal analysis: the property belongs to the management, not to the owner. The owner shall replace the lock of the unit door with the consent of other owners. Without consent, it is regarded as infringement. This is an illegal act and can be investigated for responsibility. If negotiation fails, it shall be handled by the court, which shall make a judgment according to law. Without the consent of the owner, the owner can change the lock of the owner's house privately, and the owner can handle it through alarm and legal channels. If the property infringes upon the legitimate rights and interests of other owners, the owners may request restitution.

Legal basis: Regulations of People's Republic of China (PRC) Municipality on Property Management.

Article 1 These Regulations are formulated in order to standardize property management activities, safeguard the legitimate rights and interests of owners and property service enterprises, and improve the living and working environment of the people.

Article 2 The term "property management" as mentioned in these Regulations refers to the activities in which the owner selects a property service enterprise, and the owner and the property service enterprise carry out maintenance, conservation and management of the house, supporting facilities, equipment and related sites in accordance with the provisions of the property service contract, so as to maintain the environmental sanitation and related order in the property management area.

Article 37 The ownership of property management houses belongs to the owners according to law. Without the consent of the owners' meeting, the property service enterprise shall not change the use of the property management house.

Fiftieth property service enterprises really need to change the use of public buildings and facilities, it should be submitted to the owners' meeting for discussion and approval, and the owners should go through the relevant procedures according to law. Without the consent of the owner, the property management company has no right to change the use of the public part of the community.