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Established in 1979, GRM Windows has grown to become one of South Wales most experienced and trusted manufacturers of quality PVCu Windows, Doors, Panels and Conservatories to both trade and homeowners alike. If you would like to find out more about any of our products or services please do not hesitate to get in touch.

GRM Windows utilize REHAU PVCu window and door systems, which are compatible with all major conservatory roof systems to provide a complete product solution. REHAU PVCu window and door systems offer the opportunity to choose a conservatory from a variety of shapes and designs. Anything from the straightforward lean-to conservatory, to the more elaborate Victorian or Edwardian designs, all rely on the structural capability that the REHAU PVCu windows and doors can provide to support the roof. When very large spaces are required, then portal frames would be considered in conjunction with windows, doors and roof.

GRM windows was founded by my father, Gareth Gambling, in 1979. I joined the business in 1994 with the goal of taking the business forward in an ever changing, competitive marketplace. Today, our philosophy remains to supply high quality windows and doors to the Trade at a competitive price. To achieve this, we believe in delivering excellent personal service, outstanding aftercare, innovative product development and continuing to invest in top line machinery. Our factory, based in the heart of South Wales in the village of Pontyclun, has some of the most sophisticated manufacturing machinery available to the industry.

GRM Windows manufacture for and supply some of the most well established window and door installers in South Wales and the UK. To find one close to you, please contact us and we will provide a list of your nearest approved installers.