Is it illegal to open a glass door on the outer wall of a residential building?

Yes, it has violated the decoration regulations of commercial housing. If you insist on changing, the municipal comprehensive management and property management center has the right to ask you to restore to the original state.

According to Article 53 of the Property Management Regulations, if the owner needs to decorate the house, he shall inform the property service enterprise in advance. The realty service enterprise shall inform the owners of the prohibited acts and matters needing attention in the house decoration. Forty-sixth property management areas in violation of public security, environmental protection, property decoration and use of laws and regulations. The realty service enterprise shall stop it and report to the relevant administrative departments in a timely manner. After receiving the report from the realty service enterprise, the relevant administrative department shall stop the illegal act or deal with it according to law.

Therefore, where the drawings are not submitted for approval and need to be changed, it is illegal to change the decoration projects that cannot be approved in violation of regulations.