Clement Jansen Steel Windows

Jansen is one of the leading producers of cold formed, thermally broken steel profile systems for windows and doors. Headquartered in Switzerland, the company is well known for the quality, durability and performance of its products.

At Clement, we manufacture slender Jansen steel profile windows which meet the highest requirements of thermal insulation, security and fire protection, as well as mechanical strength and longevity. Suitable for restoration work as well as new build projects, these slim frames can be fitted into all opening types.

Clement offer the following Jansen window systems:

  • Janisol doors and window
  • Janisol Art 2.0 doors and windows
  • Janisol 2 EI 30 fire rated doors and windows. Windows fixed glazed only
  • Janisol C4 EI 60 fire rated doors and windows. Windows fixed glazed only
  • Jansen Economy 50 and 60 doors and windows
  • Janisol HI doors and windows
  • Janisol Arte 66 windows


  • When triple glazed can comply to the latest Building Regulations
  • Security tested to European Standards RC2 and RC3
  • Slim sight lines
  • Various glazing options including double and triple insulated glass units
  • Produced in part from recycled steel source material
  • Supplied shaped, with shaped heads, or ‘curved on plan’
  • Fire resistance also available for sliding doors and fixed windows (not openable)
  • In standard versions also available in tilt-turn and pivot windows, lift and slide or bi-folding doors
  • Multi point locking and traditional single point locking options


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.