Business Details
For nearly five decades, GRM Windows has been a pioneering force in the design, development and delivery of premium PVCu windows and doors. Established in 1979 as a family-run business, we have grown into one of the UKs most trusted manufacturers, specialising in large-scale commercial and Passivhaus projects. Our commitment to innovation is evident in our state-of-the-art factory in Pontyclun, South Wales, where we combine traditional craftsmanship with cutting-edge technology. As a proud partner of REHAU, a global leader in polymer solutions, we deliver high-performance systems that push the boundaries of thermal efficiency, security and design. With over 90 years of collective experience within our team, we ensure every project benefits from unmatched expertise and attention to detail.
Our values of trust, honesty and respect underpin every interaction, whether with contractors, independent traders or homeowners. We take pride in supporting local industry by keeping our entire manufacturing process in South Wales. From concept to completion, we offer a personalised service that blends the warmth of a family business with the scale and precision of a market leader. Sustainability is at the heart of our operations, as demonstrated by our ongoing efforts to recycle tonnes of PVC and glass annually. Under the leadership of Managing Director Richard Gambling, we continue to innovate, advocate for energy-efficient solutions and shape the future of the UKs Passivhaus sector.
Our values of trust, honesty and respect underpin every interaction, whether with contractors, independent traders or homeowners. We take pride in supporting local industry by keeping our entire manufacturing process in South Wales. From concept to completion, we offer a personalised service that blends the warmth of a family business with the scale and precision of a market leader. Sustainability is at the heart of our operations, as demonstrated by our ongoing efforts to recycle tonnes of PVC and glass annually. Under the leadership of Managing Director Richard Gambling, we continue to innovate, advocate for energy-efficient solutions and shape the future of the UKs Passivhaus sector.
Services
PVCu windows
PVCu doors
Passivhaus windows
Passivhaus doors
Commercial window systems
Artevo windows
Total 70 doors
SLINOVA doors
Circuit Collection doors
Rodenberg panels
Highlights and features
- We have over 45 years of experience in window and door manufacturing.
- Our team offers personalised service with nationwide market expertise.
- We specialise in large-scale commercial and Passivhaus developments.
- We partner with REHAU for cutting-edge, thermally efficient systems.
- We recycle tonnes of PVC and glass annually for sustainability.
Services
Artevo Windows
Our Artevo Windows combine sleek design with exceptional thermal efficiency, making them ideal for modern homes and commercial projects. Fabricated using REHAUs advanced profiles, they offer superior insulation and durability. Perfect for energy-conscious customers seeking style without compromising performance.
Total 70 Doors
The Total 70 Doors provide robust security and energy efficiency, tailored to meet the demands of contemporary living. Designed with a variety of finishes, they enhance both aesthetics and functionality. Ideal for homeowners and developers prioritising safety and thermal performance.
Passivhaus Windows
Our Passivhaus Windows are engineered to meet the highest standards of energy efficiency, reducing heat loss and lowering energy bills. Developed in partnership with REHAU, they are suitable for eco-conscious projects. These windows contribute to sustainable, comfortable living spaces with minimal environmental impact.
Circuit Collection Doors
The Circuit Collection Doors offer a bespoke range of panels, designs and finishes to personalise any home. Crafted in-house, they blend innovation with timeless style. These doors are perfect for customers seeking unique, high-quality entrance solutions.
Commercial Window Systems
Our Commercial Window Systems are designed to meet the rigorous demands of large-scale developments, including government-backed housing. They deliver durability, thermal performance and aesthetic versatility. Trusted by contractors and developers for projects across the UK.
