my ground floor single story extension which has a flat roof is freezing cold. it's totally unheatable in the winter. we've tried turning up the heating, adding an extra radiator (portable oil filled one) to no avail. the rest of the house is ok, it's a 30s semi so gets chilly in places but nothing like the flat roof bit, brrrrrrr.
anyway. i don't think i can do this job myself but before i get a man round i want to give myself an idea of the options available. i'm sure we could insulate the roof on the outside somehow but not sure how effective this would be. we could also convert the flat roof to pitched but again, not sure how effective or costly this would be. i hate the flat roof anyway and would love to get rid of it. we also have no plans to build on top of the extension.