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Aluminium Windows

Aluminium windows are fast becoming the material of choice for homeowners who want a low-maintenance window with high performance levels at an affordable cost. A naturally durable material, aluminium improves the warmth and energy efficiency of your home whilst also looking fantastic. The slim profiles mean more light and less frame providing a contemporary, sleek appearance. With a range of systems to choose from and hundreds of colours and finishes, aluminium windows are the perfect investment for any home.

Opal window systems are made to order with great pride right here in the UK. Each window system is designed, manufactured, quality checked, packaged and delivered to the highest of standards with each customer in mind. All our aluminium windows were designed to be as thermally efficient as possible. The profiles of each window feature an extended polyamide thermal break to enhance thermal performance - this in turn keeps the room warmer yet lowers energy bills. Current Building Regulations Part L require all replacement winodws to have a U-value of 1.6 W/m²K or less. All our windows are 1.5 W/m²K or less. 

Elegant, yet strong and durable, aluminium windows enhance the beauty of any home, keeping in the warmth and allowing more light in due to the slim sightlines. Peace of mind is also ensured by the enhanced security provided by a multi-lock point system. We have a wide range of aluminium windows including flush sash windows, tilt and turn and steel replacements. 


  • Robust
  • Strong and Durable
  • Has thinner frames allowing more light
  • Low maintenance
  • Built to last
  • Energy Efficient
  • Available in a range of colours & finishes


  • Replacement windows
  • Conservatory side frames
  • Orangery
  • Garden rooms
  • Studios
  • Commercial Walkways
  • Atrium
  • Pool Enclosures
  • House Extensions


Contact Our Experts

Our expert support team can discuss your specific needs and provide details on products relevant to your installations.

01254 871 800

Marketing Support

We have a dedicated downloads section where you will find all our product brochures available in PDF format.

Should you require a brochure delivery or other marketing materials, please contact our marketing department  by emailing marketing@prefixsystems.co.uk