ᐅ Planning Roof Windows

Hello everyone,

As part of an attic conversion, the question has come up about the most practical way to install roof windows (size and arrangement).

I have attached my current ideas on paper (the plan was put together quickly, so the measurements are not entirely accurate, but that shouldn't affect the main question). The living areas are naturally reduced due to the sloped ceilings.

Roof pitch: 45°

The two larger rooms are especially important (living areas approx. 16sqm (172sq ft) and 14sqm (151sq ft)). Here I see the following basic options:
Option 1: As shown in the plan, with a double casement window on each side of the room (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 enlarge the double casement windows accordingly) or enlarge these gable windows themselves (of course, this is also a cost consideration)

I am not sure which option makes the most sense regarding future use (possible uses: office, children’s room, bedroom, guest room).
Additional questions arise such as:
- Is it practical to have a window under both roof slopes if you have to place a bed under one of these windows (considering rain)?
- Windows on both roof sides => desk can be placed anywhere since there is enough light

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

The planning consultant from Velux mentioned that the window width should be at least 55% of the respective room width. According to this, I would still have significantly too little window area.

Does anyone have any ideas or has faced a similar decision?

DasLamm schrieb:
Roof pitch: 45°

Knee wall height? Should you be able to look out the window?

DasLamm schrieb:
I’m not sure which option makes the most sense regarding future use (possible uses: home office, children’s room, bedroom, guest room).

But these are the basic details: without assigning the rooms, I wouldn’t plan the 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 requires less light than a living room or children’s room.
The position of a window in a bedroom is, for example, planned based on the bed’s placement...

Since this is already the attic, we have sloping ceilings from the floor up.

A view out of the window should be possible.

Initially used as 1 office and 1 child’s bedroom. Later on, 2 child’s bedrooms.
The two small rooms are the bathroom and storage room.

I am now leaning towards installing a window on only one side of the roof (possibly a bit larger).

On the one hand, there are still the gable windows to provide enough light; on the other hand, it is more cost-effective and offers greater flexibility when arranging the interior.