Supplier Of Award-Winning Liniar Windows & Doors

Window Supply Company is the only fabricator in Scotland manufacturing Liniar window and door profiles, the most technically advanced uPVC system in the UK.

With unrivalled energy efficiency and a design that combats the shortcomings of older profiles, these award-winning Liniar products are market leaders for good reason.

Liniar’s focus on research, development and design ensures the range continues to push the boundaries of product innovation. This is particularly evident in the area of thermal efficiency – the single most popular reason people replace old windows and doors.

This continued investment in infrastructure, technology and people has brought Liniar market-leading success and substantial growth. The company is now recognised as a leading force in door and window innovation.

The Liniar profile is designed completely from scratch. It is the first brand new profile of its kind in the UK in nearly two decades.

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How Liniar PVCu profiles work

PVCu is a natural insulator, so it is one of the most energy-efficient materials for a window frame. The Liniar uPVC window offers a multi-chambered profile, which acts as a barrier. This makes it difficult for heat inside a property to be transferred through and escape outside.

Patented designs

Liniar has patented additional features that make its frames more energy efficient

Spacer bars

Warm edge spacer bars can be selected, separating each glazed panel for higher energy efficiency

Thermal dam

A patented thermal dam creates a multi-chamber thermal barrier at the frame’s outer edge


Profiles accept double or triple glazing

Bubble gasket

Patented bubble gasket is co-extruded alongside the frame, so no heat loss or leaks

Glazing flipper

Unique glazing slipper creates a thermal barrier to seal the perimeter, keeping the cold out

Why we choose Liniar for Windows and Doors

After many years in the market, we’ve seen that Liniar provides the most technically advanced uPVC window system available.

Not only are they environmentally safe, but they are also highly functional, versatile and durable, all while offering stunning aesthetics and unbeatable efficiency. Liniar is the perfect choice for trade, commercial and private installations.

Extremely versatile, these profiles can be used in a range of ways. Whether it’s french doors, bi-folding doors, or Liniar windows, you can be assured of high security with a stylish finish. Liniar casement windows have fast become popular and are often described as 'the ultimate window'; stylish, secure and efficient.

They also come with the added benefit of a ten-year guarantee, active from the date of installation which guarantees cover from warping, discolouration and cracking. We also choose the Liniar profile for many more reasons, including:

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Environmentally friendly

Liniar profiles are manufactured using 100% lead-free materials and are fully and easily recyclable.

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The award-winning profiles from Liniar are designed from scratch to incorporate the very latest developments in window engineering technology. Liniar continues to invest in research and new product development to push the boundaries of product innovation.

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Thermally efficient

Thermal efficiency is the single most popular reason for replacing old windows and doors. The revolutionary Liniar profiles are far more thermally efficient than traditional uPVC profiles. Heat is maintained inside by removing unnecessary steel reinforcement and instead developing the latest in multi-chambered technology.

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British made

Liniar design and manufacture products from their headquarters in Derbyshire. The factory boasts the largest PVC mixing plant in the UK and is backed with ISO 9001 accreditation.