The property does not allow the windowsill of the balcony to be changed into French windows. Do they have the right? What should I do?

1. Property management companies have this right.

2. Basis (Regulations on the Administration of Residential Decoration) (Regulations on Property Management)

You can apply for decoration and submit an approval request to the Planning Bureau to prove that the project will not affect the overall housing safety of the building.

Although your house may be a frame structure, it is recommended not to change it, because it generally has an impact on earthquake resistance and thermal insulation, especially for high-rise buildings. Need glass installation, it is best to give priority to safety, lighting problems can be made up by decoration.

I hope it helps you.