Its very difficult to advise you on this type of job without seeing any pictures of your property. The best advise I can give you is to call an architect,if you proceed with the work, plans will have to be submitted for approval anyway
It's a fairly straightforward thing to do but will probably require a structural engineers input. The dormer section which sticks out will have a roof that needs to be supported at the base of the walls and where the roof joins with the main roof pitch.
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