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Existing extension needs a window and insulation added

Hi! I have an existing extension that I would like to make into (the councils definition of) a bedroom. I'm happy with the size but it will need a window added. It is also very very cold in this room, so sorting that out is something I would also like to do, it has very low floors and ceiling so these may potentially have to be raised for the heat. Looking to get help on understanding what needs to be done to achieve these things as well as costs . Flexible on timelines but would preferably like it done within the year.