Do you have the right to tear down the wall or change the use of the house at will and install sanitary facilities?

According to the Interior Decoration Management Regulations and Property Management Regulations of the Ministry of Construction. 1 10:

Interior decoration must go through the formalities, and the original design function of the house shall not be changed, public facilities and equipment shall not be destroyed, and houses without relevant supporting facilities shall not be rebuilt. If it is really necessary to change, the decoration scheme must be issued by the enterprise equivalent to the qualification of the original design unit.

For illegal decoration, the property has the right to stop it. If it is invalid, it will be reported to the housing management department for law enforcement. At the same time, it limits the handling and disposal of property rights.

According to your situation. Wall is a public facility, especially the damage of load-bearing wall has safety problems, which is illegal and destructive. To rebuild toilets, it is necessary to ensure the distribution of facilities and equipment such as water supply and drainage, ventilation and waterproof layer. If the neighborhood losses are caused by careless handling, the actor shall bear civil liability for compensation.