It is not illegal to install anti-theft nets in legal houses, and it is not illegal to install anti-theft nets in illegal buildings. Urban management will not blacklist you.

Illegal buildings mainly include:

1. Buildings built without application or approval and without obtaining construction land planning permit and construction project planning permit.

2, unauthorized changes in the construction project planning permit provisions of the construction of buildings. Buildings built without changing the nature of use.

3. Temporary buildings after construction have not been demolished into permanent buildings beyond the validity period.

4. Forging relevant materials to cheat the permission of the competent department and building.