What should I do if the second-hand house has illegal buildings and the property is not allowed to be renovated?

If there are illegal buildings in second-hand houses and the property company is not allowed to decorate them, the following measures can be taken:

1. Communication with the property management company: First, try to communicate with the property management company. Understand the reasons why they oppose the decoration and try to negotiate a solution. For example, the property company is worried that the decoration will destroy the housing structure, and can provide a professional decoration plan, indicating that the decoration will not cause damage to the housing. If the property company thinks that the decoration scheme does not conform to the overall style of the community, it can try to adjust the scheme to meet the requirements of the community. However, if the property company has no reasonable reason to stop the renovation, it can consider other ways to solve it.

2. Complain to relevant departments: If communication with the property management company fails, you can try to complain to relevant departments. For example, you can complain to the neighborhood offices or neighborhood committees belonging to the community and ask them to come forward to coordinate.

3. Solve the problem through legal channels: If the above methods are ineffective, you can consider consulting a professional lawyer to understand the relevant protection measures provided by law. In our country, the property right of the owner to the house is protected by law, and the property company has no right to illegally demolish it. However, if a property management company belongs to an administrative organization authorized by relevant laws, it may apply for compulsory execution according to law. Otherwise, the property company can ask the court to resolve the dispute, but it can't take compulsory demolition and other actions to damage the legitimate rights and interests of the owners.