Roof window installation in Glasgow. Velux have been making the world's leading roof windows for over 60 years, which means you can choose their products with confidence. They are designed to keep heat loss to a minimum, to make the most of solar thermal gain and let in natural daylight and fresh air. Professional fitting by our team. Glasgow roofing have been installing Velux roof windows for over 9 years, across a full range of property types and sizes. We have the expertise to help you through product selection and discuss the logistics of fitting a roof window. Quality guaranteed Velux products are guaranteed by the manufacturer for 10 years. Glasgow roofing will guarantee the installation of your roof window for the same 10 year period.