If you are in the Diss area and are looking for Replacement Double Glazed Aluminium or UPVC Windows call us now on Diss 01379 854445. Polytrade Building Supplies LTD supply high quality windows & doors to the trade and retail sectors. We don’t employ high pressure sales staff and only sell the best brands in the industry. If you know what sizes and style you want we can give you a price over the phone. If you need someone to measure your windows we can come to your house or project and measure the windows for you.