Liniar Casement Windows

Liniar casement windows offer total versatility and remain the most popular choice for homes all over the UK today.

This traditional British window style offers slim sight lines to let in maximum light. Available in a wide choice of configurations, including top or side hung, arched top, or as a French window fire escape.  Adding mock sash horns gives Liniar casement windows the appearance of traditional vertical sliders. To add character you can add astragal bars or Georgian bars

Choosing Liniar uPVC casement windows means you can say goodbye to draughty windows forever – Liniar’s unique, patented double-action bubble gasket, used in all our products, delivers a continuous seal – even in the corners – also keeping your windows weather proof and leak-free.

Spoilt for choice

Available in sculptured (curved) or chamfered (bevelled) 70mm profiles (frames), with either 28mm double or 36mm triple glazing, Liniar uPVC casement windows can be internally or externally beaded. Consumers can choose from Liniar’s standard 4-chamber profile, delivering supreme energy efficiency, or Liniar EnergyPlus 6-chamber profile to offer A+ Window Energy Ratings with ease – together with a wide choice of colours, finishes, hardware and glazing options.

The brand new Liniar Flush Sash Windows casement window offers an eco-friendly, cost effective alternative to traditional timber windows, with the sash fitting flush into the frame.

The Liniar brand

The Liniar brand of windows and doors is synonymous with energy efficiency, with the full product range designed and manufactured at its state-of-the-art factory in Derbyshire – however you can’t buy the finished products directly from Liniar.

Instead, the lead-free uPVC frames that are used to create Liniar products are extruded using the very latest technology and machinery, then supplied to a nationwide network of carefully selected window fabricators who manufacture the casement windows and doors to our specific and strict specifications, add glass to meet your individual glazing requirements and either install the products themselves or pass them onto independent window installers. Find your nearest Liniar fabricator here or contact us for more information.

Technically advanced

The technology used in many other uPVC casement window profiles is at least 20 years old. Liniar’s multi-chambered casement window profile was designed completely from scratch in 2007 and is far more technically advanced than most window systems on the UK market – built for today’s challenges.

To find out more about specific Window Energy Ratings, visit our WER Calculator.

Mark II loves Liniar casement windows!

“All Liniar casement windows come with a 10 year guarantee – and you can add finishing touches including mock horns and Georgian bars to personalise them for your home!”

Hi, I'm Mark II
Head of Testing at Liniar

Explore our Casement Windows

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  • Sculptured
  • Chamfered


Why choose Liniar Casement Windows?

All Liniar Products are Made in Britain

British made

Liniar casement window frames are made from lead-free PVC, which is extruded in Derbyshire at the HL Plastics extrusion plant. The factory  boasts the largest PVC mixing plant in the UK and is one of the largest employers in the region. Continued investment in the facilities keeps Liniar at the forefront of innovation.

Thermally Efficient Windows

Thermally efficient

The revolutionary profiles used in Liniar casement windows are far more thermally efficient than traditional uPVC window profiles. By removing unnecessary steel reinforcement, instead developing the latest in multi-chambered profile technology, we make sure the heat stays where it belongs – inside the home.

Cost Effective Casement Windows

Cost effective

The profiles used in Liniar casement windows deliver high energy savings for the homeowner at a cost effective price. Liniar window systems are capable of achieving WER (Windows Energy Ratings) A+12 with cost effective double glazing – and a U-value as low as 0.8 W/m²K (with triple glazing).

Better for the Environment

Better for the environment

In addition to saving energy costs for homeowners, Liniar casement window frames have always been 100% lead-free, well in advance of legislation – better for you and your family. Furthermore, all elements of Liniar uPVC casement windows are fully and easily recyclable at the end of their life.

Keep Heat Inside

Keep heat inside

With a unique six-chamber PVCu profile, EnergyPlus can easily achieve an A+ rating, helping you contain and conserve heat within your property.

High Security

High security

Liniar casement windows are fitted with high security multi-point locking as standard and are independently tested to the requirements of PAS:24 2012.

Less Frame, More Glass

Less frame, more glass

Liniar casement windows offer total versatility with its traditional British style offering slim sightlines to let in maximum light.

Triple Glazing

Triple glazing

Liniar casement windows are available with 28mm double or 36mm triple glazing - capable of achieving a U-value of 0.8 with EnergyPlus profile.

Low Maintenance

Low maintenance

Liniar casement windows will never rot, rust, or require painting - just a quick clean with warm soapy water, even with our foiled colours.

Consumer choice

With a range of optional extras including mock sash horns, Georgian and astragal bars, together with a wide range of colour options, your customers will be spoilt for choice.

Beautiful colours

Beautiful Colours

Not just available in standard white, Liniar casement windows are available in a huge choice of colours – and with many colours available from stock, you won’t have to wait months for your new windows . Liniar uPVC casement windows can be personalised to suit the colour scheme of each individual building, whether traditional or contemporary

Liniar’s factory-fitted coloured foils can give the appearance of woodgrain and won’t peel or scratch off – providing homeowners with an easy clean, low maintenance finish.

Ask for a Liniar colour swatch booklet to see samples of our high quality coloured foils.

Strong and secure

Strong and Secure

A home should be a safe haven – that’s why all Liniar products are designed, tested and certified to meet the highest standards of security.

Liniar casement windows have passed PAS 24:2012 Enhanced security performance with flying colours. Built in features also mean that Liniar casement window frames hold Secured by Design status.

A police-backed initiative, Secured by Design is awarded to products designed with exceptional security features as their main priority. Products that hold this certification are tested to meet the requirements of the Association of Chief Police Officers.