Clement SMW Range of Steel Windows
Photograph (r) taken by Laura Kelly, LSK Photo

The Standard Metal Window (SMW) ‘F’ Series window range has been manufactured since the 1920s, and is a stylish solution for a number of aesthetically sensitive historical projects.

Available only single glazed, SMW steel windows are primarily used today for bespoke replacement work in Conservation Areas and Listed Buildings, where a suitable geometric match is required and double glazing may not be an option.

Windows from Clement’s SMW range use a single pane of glass, which can be up to 10mm thick.

Silicone fronted for an authentic appearance and low maintenance, they use single point locking, an external hinge and simple weather stripping detail.

Each frame is made from recycled steel to add a further eco-friendly credential.


  • Single glazed up to 10mm
  • Traditional single point locking with an external hinge and simple weather stripping detail
  • Silicone fronted for authentic appearance and low maintenance
  • Various glazing options
  • Supplied shaped, with shaped heads, or 'curved on plan'
  • Produced from 98% recycled steel source material

Technical Information



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.