Balcony doors serve the dual function of both a window and an access point to the French balcony. Their main role is to provide an adequate amount of light and allow easy access to the railing. Balcony doors are typically made of aluminum or PVC. It’s important to choose a model with the right thermal insulation parameters and resistance to atmospheric conditions. In this case, the way the selected systems open is also significant – the doors can be hinged, lift-and-slide, or tilt-and-slide. The choice depends on the size of the apartment and the individual preferences of the user.