Does the owner need to go through the property to change the lock?

Legal analysis: generally not. Although many properties have engineering departments, they are for the maintenance of public areas. They mainly have no lock core to replace. If you buy it, you can call them and see if they can replace it.

Legal basis: Article 114 of the Civil Law of People's Republic of China (PRC), civil subjects enjoy property rights according to law. Property right is the right that the obligee enjoys direct control and exclusiveness over the specified object according to law, including ownership, usufructuary right and security right.