Many of our clients enquire to have double glazed sash windows installed into their listed homes. We are passionate about retaining the period heritage of these homes as well as bringing them up to modern energy efficiency. This is why we are proud to offer heritage double glazing options with narrow sight Pilkington K units with either an astragal glazing bar or a traditionally putty glazed bar. When applying for your permission we will provide technical drawings and specifications that show, in detail, how our windows will be sympathetic to your properties period.