Aluminium Casement Windows

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Quality KAT Aluminium Windows designed & manufactured in the UK


Whether your home is modern or traditional, we can offer a window solution to match your precise requirements. We have rounded frames, square frames and even heritage windows that replicate steel windows.

Today’s aluminium windows are the ultimate ‘must have’ in home improvement circles as they are increasingly specified for homes across the UK and Ireland, for new build or refurbishment. The very basic silver windows of the 1970’s have been supplanted by slim, thermally efficient frames, combining today’s technology with amazing surface finishes, to include textured and anodised.

Our aluminium window frames are slim, secure, strong with exceptional thermal properties. They really are stealing a march on timber and uPVC frames in terms of longevity, slim design, aesthetics and performance.  Aluminium windows are simply superior in almost every aspect and today they are very affordable.

KAT aluminium windows are manufactured to precise tolerances because our modern CNC equipment is totally uncompromising. Fortunately, our supply partners AluK also work to exceedingly tight tolerances when extruding aluminium and they share our philosophy of investing in great people, technology and machinery. At AluK they have an in-house test rig and every product is rigorously put through its paces before release to the market.

Quality is at the heart of everything we do because we want to provide you with the very best aluminium windows for your home. All of our windows are guaranteed to meet or exceed the current standards specified by UK Test Institutes, for weather performance and high security.

Our aluminium profiles are powder coated (painted) in a ‘Qualicoat’ approved plant, which is the only global specification for architectural powder coating. This guarantees durability in harsh locations such as seaside or industrial applications, so the Qualicoat specification offers complete protection. Our frames have a minimum of 60 microns of paint applied and this can be increased if extra durable finishes are required. This very high quality powder coating process means we can be confident that our windows will still look amazing in 20 year’s time.

KAT windows are available in a huge range of finishes and colours and every window is ‘made to measure’. Our range includes very slim frames designed to replicate old steel windows, once common in art deco homes.

Key features of Aluminium Casement Windows

  • 2 single colours in a textura finish and 1 dual colour
  • We can supply any RAL colour, dual colours, textured or anodised finishes
  • Low maintenance, extremely durable powder coated aluminium
  • 3 handle colours to choose from, either Black, White or Satin.
  • Choice of slim heritage sash or deep 70mm sash.
  • Externally beaded as standard, internally beaded options for apartments
  • 95mm, 150mm and 190mm Cills
  • 10 Year Guarantee on all windows


  • Windows can be side hung, top hung, fixed, tilt and turn or steel-like replacement
  • Corner posts and bay solutions
  • Windows can be internally beaded and will be fitted with a dummy sash

Square Bead with black gasket
Externally beaded as standard

If internal windows are required with an opener, please note that all fixed lights will be fitted with a dummy sash
95mm deep
150mm deep
177mm deep

25mm platform on all cills
We can supply any RAL colour, luxury textured effects or anodised finishes, which includes Marine Grade. All painted and finished in our advanced paint finishing facility in Chepstow.

From stock, we supply:
Single colour:
Anthracite Grey, White or Black

Comprehensive range of configurations of fixed and opening sashes. Can incorporate integrated deep head profiles for ease of trickle ventilation and for internal and external beading
General Description
Comprehensive range of residential casement windows to include: inward opening, outward opening, top hung, side hung, fixed, tilt and turn. All manufactured with smooth operation, security and low maintenance in mind. Fitted with modern hardware and available in a vast array of finishes.
Glass specification
Low emissivity 28mm sealed units as standard.
Clear glass, soft coat lamination, argon filled units.
Inline handles in black, white, gold, satin chrome and polished chrome.
Must be installed in accordance with Glass and Glazing Federation Guidelines. Copy of KAT Survey and Installation Guidelines available on request.
KAT – Macclesfield, Cheshire
Thermally broken Aluminium
Security and Performance
Shootbolt locking windows.
Frame depth 54mm or 72mm front to back
10 year warranty
Window sash parameters
Top hung maximum size
1600mm x 1750mm
Side hung maximum size
845mm x 1600mm based on 28mm glazing (4-20-4)

Product Awards




KAT Aluminium windows are manufactured using the latest technology, machinery and manufacturing processes. Each window is then hand-finished and checked for quality in our Cheshire factory.

Design your window to be top hung, side hung, fixed or tilt and turn for easy cleaning. Windows can open inwards (Tilt Before Turn) or outwards (Casement) to allow for curtains and blinds, with a wide range of colours available to suit your style of home. KAT manufacture Bifold doors, Patio doors and Front doors in colours to match our windows, each carrying a 10 year guarantee.



Material Information


Aluminium windows have gained in popularity in the later half of the 20th century.

The strength of Aluminium allows windows to be made with slim sightlines, resulting in a higher percentage of glass allowing more natural light into your home. Aluminium is more resistant to the elements than PVCu and Timber and is not likely to warp or rot. Windows require very little maintenance, just a wipe with a damp cloth when needed.

Aluminium is the optimum material for manufacturing windows and doors and that is why it is widely specified by Architects for most serious new build and refurbishment projects.




For your safety and security, we fit key locking handles to all of our windows.

There are 3 handle colours to choose from:

  • Black
  • White
  • Satin Chrome




Safety & Security


We take your security very seriously and without compromise fit each of our windows with key locking furniture, in three different colours.


Safety & Security

Colour Options


A little time and care with your choice of colour is advised and your selection should be influenced by your style of property, surrounding architecture or your other windows and doors.

KAT Aluminium Casement Windows are manufactured in Cheshire in colours to match our range of Bifold and Patio Doors and are made to your bespoke sizes.

We can supply any RAL colour, luxury textured effects or anodised finishes, which includes Marine Grade. All painted and finished in our advanced paint finishing facility in Chepstow.

From stock, we supply:
Single colour: White Gloss, Anthracite Grey Matt or Black Matt

Call into our Showroom in Macclesfield and we can show you a colour chart demonstrating each of the RAL colours available.




We pride ourselves in having some of the best products in the UK. Learn more about the supplier of this product on our suppliers page.

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