Sash Windows

Our vertical sliding sash windows have a timeless elegance, crafted with attention to detail to ensure the authentic appearance of original Timber Sash Windows of a distinguished era to retain the original character of your property.

Thermaseal Sash Windows not only emulate the aesthetics of their traditional timber equivalent, they also offer many additional benefits.


  • Front to back frame dimensions to match existing sash windows
  • Deep bottom rail option
  • Sash tilting for easy cleaning
  • BFRC energy rated
  • Full range of designs available
  • 10 year guarantee