Hi What day, next week, is Appt 302 due for installation? Thanks Robert and Lesley appt 302

Hi, We have just purchased apartment 302 and are thinking of installing a Glass curtain, around a section of our balcony. Firstly, do we have to apply for permission to do so? and secondly, if we are allowed, can people recommend some installers, so we may obtain some quotes. Thanking you in advance. Robert and Lesley. APT302.