Flush, aluminium casement windows are ideal if you’re looking for a strong, durable window solution that is pleasing on the eye, constructed from light material and boasts a slim frame design.


Aluminium casement windows give homes a distinct look of quality as well as they look the part in both traditional and modern homes alike. Their practicality ensures they withstand the elements and the test of time, with little maintenance needed.

Slim sightlines

Modern flat sash windows boast a stylish, modern appearance.

Look great in any style of property.

Minimal maintenance required.


  • Flush and square profiles combine to create a modern, contemporary looking window.
  • The strong aluminium profiles can house a glazed unit weighing up to 50kg.
  • Various angled bay poles, corner posts and structural bay poles available.
  • Fire escape windows available
  • An enhanced window system designed to comply with current and future building regulations.
  • Overall U values as low as 1.0W/m2k
  • Can be combined with other Express products to stunning effect.


Whatever colour finish you desire, you’ll be able to find it within our 3 ranges. We also offer additional 200 RAL colours, complete in wood grain and metallic effects. Powder-coated, baked-on paint provides a durable finish that is guaranteed for 10 years.




Standard range

Want a fast turnaround and a premium look? We keep large stocks of our three most RAL popular colours.

9016 Traffic White

9005 Jet Black

7016 Anthracite Grey

Essence range

Developed by our design experts, this unique range of seven metallic colours have proved to be our
most popular special finishes and are so exclusive they’re not even available within the RAL range.

Thunder Grey

Magma Grey

Stove Black

Smoke Grey




Elite range

The rest of our special colours offering enhanced durability and a premium textured metallic finish for added sophistication.

Emerald green

Agate green

Stone Grey

Trojan Bronze

Space Grey

Ivory Cream

Umber Brown

Pearl White

Midnight Blue

Vintage Cream







There are also up to 200 RAL colours to choose from including slight discounts for RAL 9007, RAL 7021 & RAL 7032 due to their popularity.

9007 Silver Grey

7021 Black Grey

7032 Pebble Grey


Our secure flush casement windows use toughened glass, no matter the window size.  All our casement windows have been internally glazed providing a more secure project. We have our expert surveyors on hand to advise on containment, building regulations and fire escapes.

Certass CQ Assured Scheme

Express are part of the quality assurance scheme, Certass Certified Quality. A scheme for trustworthy companies that give customers confidence when undertaking renovation, maintenance and improvement projects.


Every Express install is backed by Certass CQ, to which our customers receive a personalised Certass CQ branded certification. This certification affirms, that the installs completed by Express, have been completed to industry standards. Included within the scheme, is a 10-year insurance backed guarantee that is added to our own comprehensive guarantee. The following scheme includes:

  • Replacements of installations, extensions and newbuild projects.
  • Installation of glazed roofs.
  • All works completed across the whole of the UK.



  • Window Energy Rating A++
  • Typical U Value 1.4 W/m2K
  • Air Class 4, 600 Pa
  • Water class E, 1200 Pa
  • Wind class C4, 1600 Pa
  • Document L Compliant
  • Overall U value as low as 1.0 W/m2k possible
  • Secured by Design accredited product
  • Enhanced Security Performance PAS 24:2016
  • Single or dual colour finish option, marine quality
    polyester powder coat as standard



  • Frame depth 68 mm
  • Glass 28 mm to 43 mm – suitable for triple glazing


Maximum Vent Sizes:

  • Side Hung Vent Max o/a width 750 mm
  • Side Hung Vent Max o/a height 1500 mm
  • Top Hung Vent Max o/a width 1200 mm
  • Top Hung Vent Max o/a height 1500 mm


Minimum Transom Drop:

  • 420 mm – excluding cills and extension profiles

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