Specalist manufacturers of:

  • Aluminium Bifold Doors
  • Contemporary Front Doors
  • Aluminium Windows
  • Commercial Doors
  • Crittall Replacement Windows
  • Shop Fronts

Our Partners


SMART Systems are a popular choice for the domestic market with a reputation for product innovation, design and technical competence. Alumen offers the SMART Visofold 1000 and Visoglide systems along with the Alitherm window and door range


Schueco is a world class leader in energy efficient technology, and Alumen is privileged to be one of only a select number of UK fabricators in the UK able to offer the Schueco range of bifolding sliding doors. With ingenious features such as adjustable jambs and ultra slim sightlines, the Schueco Ass70FD is a best seller

About Us

Alumen Ltd is the specialist aluminium door and window sister company to long-established GRP Designs. Through investment in machinery and highly skilled staff, Alumen has a solution for all your aluminium doors and windows needs.

Choose Alumen for your high end, quality manufactured aluminium products and you’ll get:

  • A specialist manufacturer
  • A choice of quality systems
  • Added value with expert advice
  • Short lead times
  • Support to grow your sales and profits

Our Products

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Alumen Ltd, Unit 13 Henson Way, Telford Way Industrial Estate, Kettering, Northants. NN16 8PX