Flush Sash Casement Windows

The design of flush sash windows takes inspiration from traditional timber joinery, allowing the sash to sit flush in the frame. They are ideal for homeowners looking to bring a traditional charm to their home.

Flush sash windows

Flush sash casement windows are the latest generation of uPVC windows. They offer the realism of a traditional pre-1932 timber window combined with 21st century thermal benefits.

Many property owners require a traditional timber window frame, sometimes due to planning or environmental restrictions. Liniar Flush Sash windows can be mechanically jointed, for an authentic timber appearance.

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.

Also take a look at Liniar’s Resurgence window system, which offers flush aesthetics combined with the UK’s first double-rebated seal, giving windows a supreme weather performance!

Find your nearest Liniar stockist here or contact us for more information.

Flush Sash Windows

A+ rated windows

Liniar flush sash windows, like the rest of the Liniar EnergyPlus window range, are A+ rated. They offer a lower cost window with higher thermal benefits than timber – in addition to being fully secure.

Available in sculptured profile with the flush finish on external faces, 28mm double or triple glazing, internally beaded, with a wide choice of opening configurations, colours, finishes, hardware and glazing.

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

Innovative Approach

Created and produced in our purpose-built factory in the heart of the UK, the Liniar range of windows and doors has been celebrated for its impressive energy efficiency. What you may not know though is that Liniar doesn’t sell the finished products directly.

Using cutting edge technology and machinery, Liniar extrudes the lead-free uPVC frames used for its products, and distributes them to a nationwide network of reputable window fabricators. These fabrication experts make Liniar flush sash uPVC windows to our precise and exact pattern. Glass is added and the fabricator then either fits the products themselves or supplies them to independent window installers.

Explore our Flush Sash Casement Windows

Hover over the green dots to learn more

Choose your colour

  • Sculptured
  • Chamfered


Please note that other colours are available with longer lead times.

To see the full range of the colours we offer, visit Liniar’s colour page.

All colours are representative only- please refer to a Liniar swatch booklet for accurate colours and finishes. Not all Liniar products are available on all substrates – please refer to the Liniar swatch booklet. Colours and substrates subject to change. RAL numbers are quoted to be the nearest match.


Why choose Liniar?

Thermally Efficient

Bypassing their timber alternatives, our flush sash windows are created using our market-leading uPVC profile. This means that they can achieve an A+ standard of thermal efficiency.

Other window styles

Not sure flush sash uPVC windows are the ones for you? Not to worry, have a look at the other types Liniar offers.

QNX Passive House Secured By Design Corgi Fenestration BSI12608 PAS24 Security ISO 14001 ISO 9001 bhhpa Bali NCC Queens Awards Sustainable Midlands Supporter

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