We offer a full Velux roof window replacement service. There are huge advantages of upgrading your existing Velux roof windows, to New Generation Velux windows with window insulation U-values as low as 0.83 W/m2K. Low energy glazing provides reduced heat loss through the window and enhanced indoor comfort. In the wintertime, the heat from the sun entering through the windows is a usable solar gain. If you existing Velux roof window(s) are more than 20 years old if may be time to consider upgrading. For Velux upgrades we offer a free call out and quote service. Als Attic Ladders are Certified Velux Installers, members of the Velux Certified Partners Membership.