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 40kg.
  • 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 1.3W/m2k
  • Can be combined with other Express products to stunning effect.


Our three ranges offer some stunning popular colour finishes but we also offer the option of over 200 RAL colours so you can pick the exact colour you wish. There are also finishes to choose including wood grain and metallic effects.

And because they’re powder-coated, durability is never an issue. The colour is baked-on, providing a lasting finish that won’t peel off or lose its colour – and is guaranteed for 10 years.




Standard range

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

9016 Traffic White

9005 Jet Black

9007 Silver Grey

7016 Anthracite Grey

Essence range

Enhanced durability and premium textured metallic finish for added sophistication

Agate green

Emerald green

Stone Grey

Thunder Grey

Magma Grey

Trojan Bronze

Stove Black

Space Grey

Smoke Grey

Ivory Cream

Umber Brown

Pearl White

Midnight Blue

Vintage Cream

Elite range

Developed by our design experts, this unique range of nine metallic colours is so exclusive that it's not even available within the RAL range.











Our casement windows are designed with security in mind. Toughened glass is offered as standard regardless of size of window and all windows are internally glazed for extra piece of mind.

Our expert surveyors and staff will advise on fire escapes, building regulation and containment issues when planning your installation.

Certass CQ Assured Scheme

We are members of the Certass Certified Quality assured scheme which is a quality assurance scheme for reputable and trustworthy Companies, designed to give consumers additional confidence when working with Companies for their renovation, maintenance and improvement projects.

The Certass CQ scheme isn’t a building regulations document but offers peace of mind for the customer that their works have been installed correctly and to the relevant industry standards. As part of the scheme our installations are independently audited by Certass every month and a certificate of conformity is sent to our customers upon the completion of our works.


All our installations are backed by the Certass Certified Quality scheme and after the completion of our woks our customers receive a personalised Certass CQ branded certificate reaffirming that the works have been completed to the relevant industry standards. Also included is a 10-year insurance backed guarantee to sit alongside our own comprehensive guarantee:

  • The certification includes all works completed and installed by Express.
  • The scheme covers replacement installations and extensions and newbuild projects.
  • The scheme includes installations of glazed roofs.
  •  The scheme covers all our works across the whole of the UK.



  • Window Energy Rating B
  • U Value 1.5 W/m2K
  • Air Class 4, 600 Pa
  • Water class E, 1200 Pa
  • Wind class AE, 2400 Pa
  • Document L Compliant
  • Weather BS 6375 Part 1:2009 Resistance to Weather
  • Enhanced Security Performance BS 7950:1997
  • Enhanced Security Performance PAS 24:2012
  • Single or dual colour finish option, marine quality
    polyester powder coat as standard



  • Frame depth 70 mm
  • Glass 28 mm to 38 mm


Maximum Vent Sizes:

  • Side Hung Vent Max o/a width 800 mm
  • Side Hung Vent Max o/a height 1400 mm
  • Top Hung Vent Max o/a width 1400 mm
  • Top Hung Vent Max o/a height 1500 mm


Minimum Transom Drop:

  • 400 mm – excluding cills and extension profiles

Get the full specifications

We'll email you a link to download the full specifications

  • By requesting this email you are agreeing to allow Express Bi-Folding Doors to contact you with other information.


Find out more about our Casement windows.

Receive the latest updates and offers.

  • This field is for validation purposes and should be left unchanged.

Contact / Visit

Get in touch by phone or email or if you'd like to meet, you can visit one of our showrooms

Contact Us
Our showrooms