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Kommerling is a German manufacturer of uPVC window and door profiles, with a reputation for quality and durability built over many decades of manufacture. Our Kommerling Conservatory upvc windows and doors use the high-quality Kommerling Gold system to be sure that our customers' windows and doors will look as good after many, many years of use as they do the day they are fitted. While some upvc window materials may discolour after time, turning pink or yellow as the plastics used break down, Kommerling's window profile will stand the test of time.