Grm

Established in 1979, GRM Windows has built a reputation as one of the most experienced and trusted manufacturers of high-quality PVCu windows, doors, panels, and conservatories in South Wales. Our customers range from trade professionals to homeowners, all of whom rely on our commitment to excellence, design, and customer service.

The GRM Promise

At GRM Windows, we are dedicated to providing our customers with a comprehensive and supportive service. We offer:

• A supply partnership that is tailored to our customers' needs
• Full support package, including advice, guidance, and design software
• Thorough quality control checks on all orders prior to despatch
• Aftercare that continues after your order has been received
• A full 10-year warranty on all products
• Continued investment in production techniques and product development

Designing, Developing, Delivering

Our customer-focused and flexible approach to design, combined with our knowledge and experience in developing the highest quality windows and doors, enables us to deliver the best possible installation service. Our expertise spans across a range of products, including:

• Windows
• Doors
• Multi-Fold Doors
• Agila Sliding Patio Doors
• Geneo Windows
• Conservatories
• French Doors

At GRM Windows, we are committed to providing our customers with the best possible experience. Our experienced team is dedicated to turning houses into safe, warm, and attractive homes, while striving to be the best window manufacturer to work for.

Our History

GRM Windows was founded by Gareth Gambling in 1979, with the goal of supplying high-quality windows and doors to the Trade at a competitive price. Today, GRM Windows continues to be a family-run business, led by Managing Director, Richard Gambling. Our philosophy remains unchanged, with a commitment to delivering excellent personal service, outstanding aftercare, innovative product development, and continued investment in top-line machinery.

Our factory, based in the heart of South Wales in the village of Pontyclun, is equipped with some of the most sophisticated manufacturing machinery available to the industry. This enables us to produce windows with fast turn-around, very accurately and efficiently. Our achievements are recognized within the industry, and we are proud to be a Rehau Authorized Partner.