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Slimline Aluminium Windows

With a large range of style options available, our slimline casement windows provide a versatile choice for any glazing project. Often selected for their sleek contemporary aesthetics, our narrow aluminium frames mean a larger glazed area, allowing more natural light to flood in and better views.

Our high-quality aluminium windows feature high-security multi-point locking, have been tested to PAS 24 standards and are certified under the Secured by Design scheme. With thermally broken frames and high-performance glazed units, U-Values are as low as 1.2 W/m²K.

On top of their excellent performance, AluFold windows can be customised with plenty of colour, design and configuration options to suit any requirement.

aluminium windows technical specs

Key Features

  • Ultra slim sightlines starting from just 74mm
  • Our window frames are made from high grade, strong but lightweight aluminium
  • High performance hardware fitted as the AluFold Standard – including multi-point locking system for enhanced security, stainless steel friction hinges, and inline lockable aluminium window handles
  • Option for integrated deep head outer frame profile for simple integration of trickle ventilation
  • Unique thermal break design to surpass current thermal regulations and maintain thermal efficiency
  • A range of cill options to cover multiple window installation situations
  • Custom powder-coated using RAL or British Standard Colour Chart colours
  • 10-year guarantee

Why choose our Slimline Aluminium Windows?

Aluminium slimline windows are ideal for replacing old timber windows as well as replacing steel-framed windows. A truly versatile option, aluminium windows give your project, whether it be a new build or a renovation, a stylish and energy efficient alternative to these materials.

Modern aluminium frames also have many advantages over standard uPVC windows. Thanks to its strength and durability, aluminium offers a much longer lifetime for newly installed windows, providing both you and the customer with total peace of mind.

Paired with much better thermal performance and improved security, it’s no surprise aluminium windows are becoming the preferred choice for glazing projects all over the UK.

Multiple Configuartion Options

We offer a range of configuration options to suit a wide variety of opening, hanging and aesthetic requirements.

A side hung window is the classic choice, whereas top hung aluminium windows will offer added security and weather protection. Dummy sash windows provide a more sympathetic option for traditional styles and French casement windows allow for totally unobstructed views, the choice is yours.

The AluFold Standard

There’s nothing ‘standard’ about the AluFold Standard. All of our aluminium windows are supplied with high-performance Low-E soft-coat, toughened, double glazed units with a warm edge spacer bar.

Glazing options

  • Our slimline aluminium windows are internally glazed with 28mm glazing thickness
  • Internally or externally glazed options are available to accommodate low and high rise projects
  • Available double glazed or triple glazed depending on your requirements
  • We also offer premium upgrades for enhanced security, enhanced sound insulation and UV fade protection
  • For more aesthetic upgrades, choose from inset Georgian bars and additional glass options such as a clear, textured, tinted or satin finish
Inspired by colour

Whether your project calls for statement aluminium windows in bold, daring tones or a more timeless, reserved palette, with AluFold anything is possible.

All of our aluminium window and door profiles are powder coated to ensure protection against the elements and prolong the lifetime of the windows, but this also creates limitless customisation options.

Choose from any single colour from the RAL or British Standard Colour Chart.

We also keep a large stock of our standard colours which include:

  • White aluminium windows (RAL 9910)
  • Anthracite grey aluminium windows (RAL 7016)
  • Black aluminium windows (RAL 9005)

Additional options for our slimline casement windows include dual colour, textured or an anodised finish.

grey slimline windowswhite slimline windows
RAL 9910
RAL 7016

Slimline Aluminium Windows Performance

Our slimline aluminium windows are not just a visually stunning feature to complete your project, they also offer superior performance– from enhanced security and durability to excellent energy efficiency.

Delivery Information

Our state-of-the-art facilities not only allow us to help you in every stage of the process from design to installation, but also give us the opportunity to hold large amounts of stock. This guarantees fast delivery of our aluminium windows, so that you can impress your customers and get the job done quickly.

Here at AluFold Direct, our turnarounds are some of the fastest in the industry, meaning your windows can be delivered to suit your project’s schedule, helping you stick to deadlines, saving time and money for everyone involved. Check the latest lead times here.

We deliver nationwide, all across the UK from Inverness to the Channel Islands, direct to site in an unmarked van for an uninterrupted installation process. Alternatively, if you’re near to our Blackburn base, you can collect your aluminium windows or doors direct from our factory.

Aluminium Windows Guarantee

For complete peace of mind, all AluFold Direct windows and doors, including our Slimline Aluminium Casement Windows, are covered with a limited 10-year guarantee.

Please visit our guarantee page to learn more.

Need advice? Call our order support line: 01706 260 700
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Slimline Casement Windows
Product data sheet
| Product data sheet
Slimline Casement Windows

Download this file to see technical drawings, size and weight limits, performance data and other specifications.