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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.

The GRM Promise

  • A supply partnership supporting our customers needs
  • Full support package of advice, guidance and design software to help your business
  • Thorough quality control checks on all orders prior to despatch
  • Aftercare that helps after your order has been received
  • Full 10 year warranty on all products
  • Continued investment in production techniques and product development




    Providing a customer focused and flexible approach to design


    Utilizing our knowledge and experience to develop the highest quality windows and doors


    Supporting both trade and homeowners to deliver the best possible installation service

Experience, Quality, Design

Visiting GRM Windows during Covid 19 


Due to Covid 19 restrictions announced by the Welsh Government, we have updated our briefing that outlines how these latest changes may affect our customers. If you are planning to visit our factory, to either collect product or discuss your needs with us, we would ask you to read them carefully in order to avoid additional disruption and to greatly reduce the opportunity for the spread of this virus.


We are open! GRM Windows will be remaining open to manufacture products. With this in mind, we will be prioritising the production of jobs that can be safely installed. 


- You must book an appointment with GRM Windows at least 24 hours prior to your visit.  Unfortunately, you will not be allowed on site without one.


- There will be no public access to any of the buildings (Reception, offices, factory premises).


- You must wear a mask as soon as you arrive. You will not be allowed on site without one.


- Our deliveries will be restricted. We can only deliver if you have a yard/factory facility, or if the job is at a building that is not occupied.


We apologize for any inconvenience caused, however, we remain hopeful that these measures will prevent the spread of Covid 19 and ensure an early as possible return to normal trading conditions for us all.

Contact Us Today

If you would like to find out more about any of our products or services please do not hesitate to get in touch.

We'd be happy to provide you with a quote and discuss your needs in greater detail.

01443 226987

Experience. Quality. Design