Planning roof windows

Hello everyone,

in the context of an attic conversion, the question currently arises as to how skylight windows could be used most effectively (size + arrangement).

I have put the current considerations on paper in the attachment (I quickly put the plan together, the measurements are not exactly correct, but this should not be decisive for the fundamental question). The living areas are of course correspondingly smaller due to the sloping roof.

Roof pitch: 45°

The two larger rooms (living area approx. 16 sqm and 14 sqm) are particularly important. Basically, I see the following options here:
Option 1: Do it as shown in the plan, i.e. a double casement window on each room side (are the current sizes sensible?)
Option 2: Remove the double casement window on the west side of the roof and instead install a correspondingly larger double window on the southeast side

Optional: Either brick up the existing small gable windows (and accordingly enlarge the double casement windows) or enlarge these windows themselves (of course, this is also again a question of cost)

I'm not sure which option makes the most sense with regard to later use (possible uses: study, children's room, bedroom, guest room).
Questions arise such as:
- Is it sensible to install a window under both roof slopes if you then always have to place a bed under such a window (keyword: rain)
- Windows on both roof sides => desk can be placed anywhere since there is enough light

Opinions differ somewhat on this (I have also asked a building planner/draftsman I know, who would favor option 2 if the double window is chosen to be correspondingly large).

By the way, the planning advisor from Velux says the width of the windows should be at least 55% of the respective room width. According to this, I would still have significantly too little window area.

Does anyone possibly have a few ideas or have faced a similar decision before?

Roof pitch: 45°

Knee wall? Should one be able to look out of the window?

I'm not sure which variant makes the most sense regarding later use (possible uses: study, children's room, bedroom, guest room).

But these are the basic information: without assigning the rooms, I wouldn’t plan any windows! How are we supposed to know what the rooms will be used for? A dressing room needs less light. A bathroom with white tiles needs less light than a living room or children's room. The position of a window in a bedroom, for example, is planned according to the position of the bed...

Since this is already the attic, we have slopes here from the floor.

A view out of the window should be possible.

Use initially 1 x study, 1 x children's room. Later then 2 x children's rooms. The two small rooms [Bad + Abstellraum].

I now tend to install a window on only one side of the roof (possibly a bit larger then).

On the one hand, there are still the gable windows for sufficient light, and it is also cheaper and offers a bit more flexibility regarding the furnishings.