About us
Welcome to Thermawood The most advanced double glazing system for existing timber windows Thermawood retrofit double glazed windows creates a unique dry glazing system for double glazing the existing timber windows and doors in your home and is designed to fit any existing timber joinery. The patented retrofit double glazing works by enhancing insulation with an IGU, without having to tear out your entire window and then to be stuck with new double glazed aluminium windows or a extremely expensive window replacement with new double glazed timber windows.