Chelsea Secondary Glazing are happy to provide you with specially developed versatile horizontal sliding windows; manufactured with up to 4 sliding panels, this secondary glazing offers a harmonious match for all types of windows. The individual panes slide effortlessly that allow unhindered access to the main windows.

Made with premium quality aluminium that coated with your choice of colour to suite and match any type of décor.

Similar to the hinged glazing, we provide two main types of systems:

  • Residential slim line system: Designed for period windows. The aluminium outline is very slim, making sure the secondary glazing blends in perfectly with the outer windows. If the problem at hand is thermal insulation or sound reduction, this system can house a glass up to 6.4mm thick that can reduce noise by a minimum of 97%.
  • Commercial hinged system: where a slim line is not feasible for the surroundings, our heavy duty system offers an alternative where a much larger frame can be installed to hold a much thicker glass.


  Minimises draughts
  Increases the rating on an EPC (Energy Performance Certificate)
  Improves comfort
  Reduces energy bills
  Reduces air infiltration
  Meets heritage guidelines
  Reduce heat loss


  Creates a quieter environment
  Reduces sleep disturbance
  Meets noise planning constraints
  Aids increased concentration and productivity
  Protects hearing
  Keeps annoyance and stress levels low


  Blast mitigation
  Deters intruders
  Protection against firearms
  Preserves clean environments
  Second barrier to entry
  Removes the need for unsightly grilles
  Maintains a normalised environment
  Provides a delay mechanism