Liniar Windows
Welcome to the Liniar uPVC window collection, supplied and installed across Andover, Hampshire, and the surrounding areas by KJM Group. Designed, tested, and manufactured entirely in the UK, Liniar is widely recognised as one of the most technically advanced and innovative uPVC profiles on the market. Created from scratch to meet the rigorous demands of modern house building and energy efficiency standards, the Liniar system offers a highly versatile, lead-free solution. Whether you require standard casements, traditional flush sashes, or high-performance architectural frames, Liniar delivers outstanding thermal retention, enhanced security, and a beautiful finish for any style of property.
U-values as low as 1.2 W/m²K
Exceptional Energy Efficiency
The core advantage of the Liniar profile is its exceptional energy efficiency. Unlike older uPVC windows that relied heavily on heat-conducting steel reinforcement, Liniar’s original 70mm system features a highly engineered multi-chambered profile. By incorporating built-in thermal dams and a patented co-extruded bubble gasket, Liniar frames naturally trap warmth and prevent cold draughts. This advanced internal structure means you can easily achieve Window Energy Ratings (WER) of A+ and U-values as low as 1.2 W/m²K using cost-effective double glazing. For even greater performance, the Liniar EnergyPlus range features six chambers, capable of reaching Passivhaus standards to significantly lower your household heating bills. Furthermore, the entire range is 100% lead-free and fully recyclable, making it an incredibly eco-friendly choice for your home.
Casement, Flush & Resurgence
Liniar Window Range
We offer a comprehensive range of Liniar styles to complement both traditional and contemporary properties. Explore our standard Casement Windows, available in the versatile 70mm profile for a clean, classic aesthetic that suits almost any home. If you want to replicate traditional timber joinery, discover the Liniar Flush Sash range, where the window sits entirely flush within the frame. For the ultimate in flush sash technology, the unique 80mm Resurgence system features a patented double-rebated seal, completely hiding the exterior weather seals for an incredibly authentic heritage look. We also offer highly functional Tilt and Turn, French, and Reversible window styles. Explore the individual product categories below to view custom configurations, security features, and a wide array of smooth and woodgrain colours.
Liniar Brochures
FAQ's
What is a multi-chambered window profile and why is it important?
The profile is the uPVC frame that holds the glass. Inside a Liniar frame, the uPVC is divided into a series of symmetrical internal ‘chambers’ rather than being a single hollow hollow tube. These chambers trap pockets of air, breaking up the thermal bridge and preventing the heat inside your home from transferring to the cold air outside, which drastically improves the window’s energy efficiency.
Are Liniar uPVC windows environmentally friendly?
Yes. The Liniar window system was designed from the ground up to be 100% lead-free, ensuring the manufacturing process and the final product are safer for the environment. Furthermore, the uPVC used in Liniar windows is highly recyclable, meaning the frames can be repurposed at the end of their lifespan rather than ending up in a landfill.
Do I need triple glazing to achieve an A+ Energy Rating with Liniar?
No. Because the Liniar frame itself is so thermally efficient (using multi-chambered technology and patented bubble gaskets), the standard 70mm profile can easily achieve A+ Window Energy Ratings and incredibly low U-values using standard, cost-effective double glazing. Triple glazing is available if you require maximum acoustic insulation or Passivhaus-level thermal retention.
What is the Liniar Resurgence flush sash window?
Resurgence is Liniar’s premium 80mm flush sash window system. While standard flush sash windows look like traditional timber, their weather seals are often visible from the outside. Resurgence features a unique ‘double-rebated’ design, which completely hides the exterior weather seals. This creates an incredibly authentic timber aesthetic on the outside while delivering exceptional draught-proofing and modern performance on the inside.
How secure are Liniar windows?
Security is a fundamental part of the Liniar design. The internal webbing of the multi-chambered profile adds immense structural strength without the need for traditional steel reinforcement. When combined with high-security multi-point locking systems and robust hinges, Liniar windows meet the strict criteria for PAS 24 Enhanced Security and hold Secured by Design accreditation, ensuring your home is protected against forced entry.
Award-winning local expertise and a pressure-free approach
Why Choose KJM Group for Your Liniar Windows
Since 1983, KJM Group has been installing high-quality glazing solutions across Hampshire and the surrounding areas. As an independent, award-winning Which? Trusted Trader, we pride ourselves on delivering honest advice, transparent pricing, and a strict no-pressure sales policy.
To ensure the advanced multi-chambered Liniar profiles perform exactly as they were engineered to, they must be fitted with exact precision. Our experienced, in-house installation team ensures every frame is installed flawlessly, respecting your home throughout the process. From your initial consultation through to our comprehensive aftercare service, we provide a reliable, professional experience that guarantees your new windows remain secure, warm, and beautiful for decades to come.