Aluminium Windows

A class-leading, versatile window system design…

Universal Aluminium Cills

Our range of universal aluminium cills with pre-drilled screw ports are compatible with most other door and window systems, as well as with our ALUNA window system. They are effective in directing water away from brickwork and also offer an additional design element to the aesthetics of the window.

Our aluminium cill is more robust than PVC alternatives and comes complete with plastic push-in colour matched end caps, in our standard stock colours, for a secure and sleek finish.

Cill sizes are 90mm, 150mm, 190mm and 230mm.

Available in Black, White, Anthracite Grey, textured Mill finish, and dual colours of White/Anthracite Grey and Black/White and can also be powder-coated in any RAL colour.

Technical Performance


Profile Feature Technical Details
Frame-to-Sash Sightlines 82mm, 70mm
Max. Sash Height 1500mm
Max. Sash Width 1500mm (Top Hung) 900mm (Side Hung)
Max. Sash Weight 50kg (Top Hung) 40kg (Side Hung)
Max. Glazing Thickness 28-44mm
Types of Glazing External/Reverse Adapter/Dummy Sash
Frame Depth 81mm Flush / 73mm Standard
Sash Depth 73mm


Profile Feature Technical Details
Thermal Efficiency Window Energy Rating (WER) of A, which complies to Part L.
Weather Tightness Air permeability Class 4 (600 Pa) EN1 026:2000, EN 12207:1999
Water Tightness Side-hung: Class 8A (450 Pa)
Top-hung: Class E1500 (1500 Pa) EN 1027:2000, EN 12208:1999
Wind Load Resistance Side-hung: Class C5 (2000 Pa;1/300)
Top-hung: Class CE2400 (2400 Pa; 1/300)
EN 12211:2000, EN 12210:1999
Security PAS24: 2022 (class W)


All configurations of the ALUNA window system can be finished in several glazing options to create a style that suits any property. Choose from:

  • Double Glazed
  • Triple Glazed
  • Integral Blinds
  • Heritage Look Astragal Bars
  • Solid Panel Inserts


Some of the most popular applications that can be made from the Aluna window system are listed below but there are many more besides. Please refer to the configuration diagram.

  • Can be used as a side light with openers and easily couples to our Aluna bifold door system.
  • Side hung opener next to a fixed frame.
  • French casement window with double side hung openers.
  • Standard casement window – top opener over a fixed frame.
  • Crucifix 4-pane window with 2 top openers over 2 fixed frames.

Make an Enquiry

Contact us using the form below and a member of our team will be in touch to assess how we can help you.



The ALUNA window is available as a contemporary flush sash in our highly desirable super slim sash to complement the slim profile of modern bifold and patio doors.

With its elegant, contemporary design, the ALUNA window perfectly complements our other ALUNA systems, bringing you a cohesive range of products to complement one another.

Interested in getting a quote on a Sliding Door System from Sign Windows? Feel free to give us a call today, our team will be happy to assist you.

Our Work

Here are just some of the work that we have carried out for our customer