Chelsea Secondary Glazing provide the best possible style of vertical sash windows, this style of windows is the most popular for home owners and consists of two main panels that slide up and down, held by the most durable spring to hole the weight of each panel. With all the mechanism working in tandem, this allows the windows to be operated with ease and minimal effort.

One of the main essentials are that the windows mimic the external windows, it requires the middle joining bar (transom bar) to aligned perfectly with primary window, it ensures that none of the elegance of the main window is overshadowed by the secondary window and blends in well with any room.

With our recent innovation we have come to a stage where we can provide our consumers with an easy to clean internal secondary sash window with out the flaws of the conventional system. The slim line profile sits effortlessly against any type of period window with a sliding system designed to sit securely within the master frame, this will alleviate any exterior noise and keep the inside well insulated

We also offer a heavy-duty secondary system for commercial use, which can house thicker glass and or be double-glazed. This specialised system can solve many existing issues where a conventional system may not be appropriate.


  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