GRM Windows

We have been designing, developing, and delivering high-quality windows and doors for over 45 years. Our journey began in 1979, and we have since grown into one of the UK's most experienced manufacturers of PVCu windows and doors. We specialise in large-scale commercial developments and pioneering Passivhaus projects. We are incredibly proud to be a family-run business, keeping our entire design and manufacturing process in the heart of South Wales. We have spent the last decade refining our expertise in partnership with REHAU to bring Passivhaus standards to the UK market. Our dedicated team has successfully delivered on government-backed housing developments and complex commercial Passivhaus builds.

We combine the personal attention to detail of a family firm with the technical output of a nationwide market leader. We push the boundaries of design while maintaining superior thermal performance, security, and quality. Our recycling initiatives demonstrate our commitment to a greener future, with significant volumes of PVC and glass recycled annually. We offer a comprehensive range of solutions, from our Artevo window profiles to our bespoke in-house Circuit Collection doors. Every stage of our process, from concept to delivery, benefits from our dedicated personal touch. We believe the perfect door has the ability to make a house a home, and we strive to deliver that feeling to every client.