Manufacturers & Installers of German PVC Window & Door Systems. Importing direct from Europe, our savings go direct to you! Windowplus started trading in the replacement PVC window and door market in June 1984 and from our humble beginnings have grown into a highly respected manufacturing & installation company. We operate from our 10,000 sq ft custom built factory in the south side of Glasgow (Thornliebank just off the M77). We offer a full range of PVCu products available in double glazing or triple glazing to satisfy all aspects of the replacement window, door and conservatory market. We offer a full range of foiled colours covering all our products including our PVC Bi fold range, sliding patio range and vertical slider (sash and case) range. We have recently added a new composite CNC routing machine to our factory machinery making Windowplus one of the only 5 companies in Scotland to manufacture their own composite GRP door range. We have always strived to be as versatile as possible in a highly competitive market and due to this offer a full range of products with various choices for fitting to suit every budget. We provide a full retail supply and fit or supply only service. In fact we can tailor a package to suit any need from homeowner, landlords, builders, builders’ merchants, DIY, architects, local authorities and trade.