Roof window and balcony combination.

The cabrio system by velux can go from roof window to balcony is just a few seconds. It is installed like a skylight but can be opened in two ways, transforming itself into a personal balcony. In order to achieve this result, the upper section is top-hung and opens outwards and up while the bottom section unfolds into a transparent balcony complete with protective side railings. Not only does it add a few extra space to your interiors, but also provides fresh air and natural light into dark areas.

https://www.veluxusa.com/products/roof-windows/cabrio-balcony