Question About Insulating a Loft Room

Hi my name is Ron we had a chat yesterday regarding my roof. I’m looking to give this flat some warmth as it freezing in winter and a green house in summer. I also would like to put two skylight windows on the roof to release the heat in the summer, as well as replacing the windows front and back with something that slides or fold inside to release the heat. Please could you advise.

I will pop up on the roof and get the size for you tomorrow. I also like the idea of the walk on skylight for a flat roof with hardwood timber decking as I would like to utilise the roof space as a patio but not sure if this is possible.

Thanks,

Ron