Good evening Sabine,
On the ground floor, the ceiling should be about 2.70m high. Standard windows usually start at about 90cm sill height and are approximately 125cm high.
It should be x-width x 1.26 m height.
With a 2.70m high ceiling, there would still be over half a meter of wall above the window. Should the windows just be planned higher or does that look silly from the outside?
The module size for windows is 12.5 cm.
In the above example, I would recommend switching to a height of 1.385 m, for the floor-to-ceiling window elements to 2.26 m. With these heights, there is enough space for the top-mounted roller shutters and they are pleasing to the eye as they fit the room height.
Rhenish greetings