Hi i’m after some advise or guidance as I’ve been saving for years and don’t want to get this wrong, I’m planning an extension to my mid terraced town house. It will be 6 meters across the entire back of the property and 4 meters out. It will be single story and north facing so skylights are essential. I think a tiled shed roof is our best option due to overlooking and collecting water. However what I am totally unsure of is what selling to have. Flat or sloped with the skylights.