Considering the design of the interior and exterior of the house, how much light is required and ergonomics before you consider installing a window.
Daylight is important because it provides more energy, we learn faster, and less stress-related illnesses. To maximize the light from the roof into account the size of the roof, the number of windows, window placement, and the internal layer are important things.
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One of the large windows allows more day-light or a small size window will bring the same amount of day-light. One large window lit up at least 46% of the room while the two medium-sized windows will allow 48% while small windows evenly spaced throughout the room will allow more light to 65%.
The outer layer of vertical or horizontal windows will allow light accordingly. Pose Velux with layers and layers vertically below the horizontal above the window will allow more light to enter the room the day.
To ensure more correct circulation splayed reveals allow air to circulate freely rather than trapping it and causing condensation. Rafters and beams should not be cut without professional advice to install windows because they can cut one that will provide support to the window.
One should think about the exterior and the aesthetics of the house, before considering the windows to the roof. It is recommended to add snow guards to prevent the window from permanent damage.