Flush Sash Window

Many property owners require a traditional timber window frame, sometimes due to planning or environmental restrictions. Timber frames tend to be expensive, need regular maintenance and can be difficult to replace.

Liniar recognised the need to develop a casement window frame that would fit into any property, where the sash fitted flush into the frame – and which could be foiled to look like traditional timber or to offer a sleek, contemporary finish.

The Liniar flush sash window, like the rest of the Liniar EnergyPlus window range, is ‘A+’ rated, offering a lower cost window with higher thermal benefits than timber – in addition to being fully secure and available in a huge choice of colours.

EnergyPlus – setting new standards

The EnergyPlus range offers even greater energy efficiency for your home. With a unique six-chamber PVCu profile that’s fully compatible with other ranges, EnergyPlus profiles can achieve an A+ rating without the need for expensive low-iron glass on the outer pane of glass or the need for costly thermal inserts.

What’s more, EnergyPlus profiles can achieve a Window Energy Rating of a staggering A+12*. The additional chambers designed into the PVCu profile when it’s manufactured prevent less cold air entering your home, and less warm air leaving it.

The cross section above shows how our multi-chambered profile prevents the transfer of heat from the inside to the outside..

Why pay to heat your home, then lose up to 20% through your windows and doors

Before: Heat is being lost through inefficient windows and door. After: Heat stays where it’s meant to be – inside your home

Safe and secure

Your home should be a safe haven – that’s why all Liniar products are designed, tested and certified to meet the highest standards of security. We also cyclic test our moving parts to make sure they won’t wear out, however much you use them


Developed by Liniar in conjunction with Yale, ModLok™ technology not only provides the strongest possible locking mechanism for your security but also enables the PVCu to be disposed of in the most environmentally friendly way possible at the end of its life.


This accreditation is part of the British Standards system and shows that every component used to make the product has been subjected to a series of tests, demonstrating enhanced security performance for your peace of mind.

Secured by Design

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

ISO 9001:2008

ISO 9001:2008 sets out the criteria for a quality management system. The standard is based on a number of quality management principles including a strong customer focus, the motivation and implication of top management, the process approach and continual improvement. By using this standard, we are ensuring that our customers get consistent, good quality products and services.

BBA Approval

The BBA (the British Board of Agrément) is the UK’s major authority offering approval of construction products, systems and installers. The certificatesare recognised throughout the UK by architects, engineers and specifiers as an impartial and unbiased review on the performance of products. Liniar holds a certificate for the whole window system to further prove its quality..