GRM

We have been designing, developing, and delivering high-quality windows and doors since our establishment in 1979. Our family-run business operates from the heart of South Wales, maintaining complete control over every stage of design and manufacture. We specialise in large-scale commercial developments and Passivhaus projects, bringing over four decades of manufacturing expertise to each commission. Our partnership with REHAU enables us to supply market-leading PVCu profiles that meet rigorous thermal performance and security standards. We have spent the last decade refining Passivhaus solutions, successfully delivering government-backed housing and commercial schemes across the UK. Our dedicated team combines the personal attention of a family firm with the production capacity of a nationwide market leader.

We recycle significant tonnages of PVC and glass annually, demonstrating our commitment to sustainable manufacturing practices. Our product range includes the Artevo and Total 70 window systems alongside the SLINOVA and Circuit Collection door ranges. We work closely with architects, designers, installers, and developers to ensure every project meets exacting specifications. Our in-house design capability allows us to push the boundaries of aesthetics while maintaining certified performance values. We pride ourselves on transparency, providing dedicated support from initial concept through to final delivery and beyond. Our customers benefit from a seamless service that integrates technical expertise with genuine care for project outcomes.