Welcome to Liniar

The most technically advanced uPVC window and door systems in the UK.

Quality every home deserves

Liniar profiles are manufactured using tried and tested methods, ensuring they're covered against warping, splitting and discolouration for 10 years.

10 Year Guarantee

Liniar profiles are built to last and come with a 10 year guarantee against cracking, warping or discolouration from the date of installation.

Thermal Efficiency

Liniar are committed to innovation; resulting in their ability to provide your customers with the most thermally efficient 70mm window and door system available.

Secured By Design

Liniar are a 'Secured by Design' accredited manufacturer; the gold standard in window and door security. Meaning your customers can be confident their home are safe.

The Perfect Profile

Liniar has an absolute commitment to ensuring that each and every one of their products provides exceptional advantages over traditional uPVC frames. Liniar have designed an innovation system that is thermally efficient, strong and secure; to keep your home safe and warm.

Our System

Glazing Flipper

Unique ‘glazing flipper’ gasket reduces cold transfer, water ingress and noise pollution.

Superior Gaskets

High performance (patented) double-action ‘bubble’ gaskets maintain tight weather seals.


Size-optimised chambers break up mini convection currents locking in pockets of warm air.

Integrated reinforcing

Internal structures provide exceptional rigidity while minimising the need for steel reinforcing.

Positive Drainage

Specially designed profile contours maximise natural drainage and prevent moisture build-up.

Thermal Dam

Designed to Passivhaus recommendations, the thermal dam reduces heat transfer.

Why we choose Liniar

The most technically advanced and environmentally friendly uPVC window and door systems in the UK.


Liniar's ground breaking profile system has been designed from scratch, to meet the technical requirements of today and provide innovative solutions to customers' challenges.

Colour options

With a range of frame colours available, our windows will complement any customers' home. Colours range from traditional white uPVC to rich Golden Oak and Rosewood.

British engineering

Liniar manufacture all products from their headquarters in Denby, Derbyshire. This advanced, purpose-built facility houses the largest uPVC extrusion mixing plant in Europe.

Lead free

The environmental dangers of using lead are well known. Liniar profiles are manufactured using 100% lead free materials; substantially minimising environmental impact.

100% recyclable

Our uPVC windows are extremely robust and do not need expensive steel reinforcement, making them 100% recyclable and a truly environmentally friendly product.

Reduce your carbon footprint

With uPVC windows installed throughout their home, your customers will reduce their energy usage and CO2 emissions by around 2/3 of a tonne (680kg) each year.