You should have at least an 8 12 pitch for it to look as if it belongs.
Minimum roof pitch for dormers.
Having a steeper pitched roof allows for more space in a shed loft.
It would end up looking very long and awkward.
This image shows a relatively shallow roof pitch of 15 degrees.
That pitch is too shallow to hold the shape of the dormer.
Pitched roofs can also be used to incorporate roof lights angled in a specific direction or dormer windows.
This type of dormer needs a roof pitch shallower than that of the original.
If the dormer is built above living space rather than over an attic or if you re converting attic space to living space then it provides much needed natural light.
Minimum roof pitch the minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
The loft space would be much larger with a roof pitch of 45 degrees.
However you can only use this pitch with built up roofing or specialized.
These are the windows that seem to stick out from the face of a roof.
You need to have a roof pitch that gives you at least the height of a window and then some.
A shallow pitch cannot sustain a dormer window simply because the interior space makes a dormer window impossible.