Designing, developing and delivering high quality windows and doors for over 45 years

Established in 1979, GRM Windows has grown to become one of the UK’s most experienced and trusted manufacturers of PVCu Windows & Doors, specialising in large scale commercial developments and Passivhaus projects.

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Tonnes of PVC recycled 2024
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Tonnes of glass recycled 2024

Stats based on 2023-2024

Passivhaus

Bringing Passivhaus to the UK market, we’ve spent the last decade refining and assisting our profile partners REHAU in the journey to a greener future. Our expertise has allowed us to successfully deliver on large scale projects, government backed housing developments and commercial Passivhaus developments over the past decade.

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Our values

We’re incredibly proud to be a family-run business, supporting local industry by keeping our entire design and manufacturing process right here in the heart of South Wales. From concept to delivery, every stage benefits from the GRM personal touch.

Our customers can expect the attention to detail and dedicated service of a family run business, combined with the scale, manufacturing expertise, and output of a nationwide market leader.

Windows

Working with our profile partners at REHAU allows us to deliver on some of the UK’s most unique projects. With a variety of profiles, colours and finishes, we’ve been able to push the boundaries of design whilst maintaining the thermal performance, security and quality of market leading windows.

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Doors

The perfect door has the ability to make a house a home. From Rodenberg panels to our all new in-house Circuit Collection, we offer a wide range of panels, designs and finishes to truly personalise your, or your customer’s homes.

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Passivhaus

Bringing Passivhaus to the UK market, we’ve spent the last decade refining and assisting our profile partners REHAU in the journey to a greener future. Our expertise has allowed us to successfully deliver on large scale projects, government backed housing developments and commercial Passivhaus developments over the past decade.

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Start your design today

Your next project starts with GRM Windows. Our friendly team in South Wales are on hand to help make your vision a reality. Explore our website further or get in touch using our details below.

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