Clement W40 Range of Steel Windows

An advanced steel window introduced in the 1990s, W40 windows are ideal for larger projects such as schools and public buildings, but equally may be used in all types of property where strong, durable frames, efficient opening casements and robust fittings are required.

W40 steel window frames are suitable for new build or metal window refurbishment projects where the pattern of the original fenestration is to be maintained.

The W40 steel window frame are preferred by architects for metal window refurbishments due to the advanced strength of steel and for fulfilling the requirements for listed buildings. 


  • Insulated glass units up to a maximum thickness of 26mm
  • Part L compliant
  • Multi point locking to BS 7950 or traditional single point locking
  • PAS24:2016 on top hung vents, single and double doors when using our multi point locking systems
  • Various glazing options
  • Supplied shaped, with shaped heads, or ‘curved on plan’


Clement Steel Windows Glazing


We offer five different styles of glazing, from clear glass, to genuine lead in an arrangement to match the pattern of your original leaded lights, to the G+ and Fenestra joint systems which are unique to Clement. All of these options have superb features which faithfully replicate those of original steel windows.

Clement Steel Windows Colours


Our steel windows are hot dip galvanized and available in a choice of highly durable Akzo Nobel powder paint colours. Clement Windows provide an average paint coating in excess of 100 microns on flat surfaces – the industry standard calls for 60/70 microns. Order from a wide range of RAL colours to match your scheme or choose different colours for the inside and outside of your windows.

Clement Windows Accessories


Browse a select range of accessories which perfectly complement our stunning steel windows, doors and screens. Carefully crafted in a number of different styles and available in a choice of colours and finishes, our range of handles and other fittings are made from the finest quality materials and manufactured with the latest technology in mind.