Flat glass flat roof windows offer a more modern look than the traditional polycarbonate dome windows. There is a style and budget to suit all projects; The PVC Raylux which is a budget friendly flat roof window. VELUX flat glass windows are mid range and offer high end quality at a reasonable price. At the pricier end of the scale you have the Atlas, EOS, Whitesales & Sunsquare flat glass flat roof windows which if you want the best of the best these are it.