Bay Window - The stylish and highly practical option of window space that can function as an extra seating space or as a secluded light filled work space. It also gives the room interesting bay design choices like polygonal/octagonal shape or even a curved/semi-circular/square shape.Fortunne Window Designs can offer you the best possible uPVC window design solutions for Bay Windows of all shapes and sizes. Because these windows are installed in an angled style, we apply a great degree of care and precision both during the manufacturing process and the installation process.