Last edited 27 May 2021

Types of window

UPVC windows 270.jpg Awningwindow.jpg Patent glazing.jpg

Windows are openings fitted with glass to admit light and allow people to see out. They are often openable to allow ventilation. Although the historic use of glass dates back to the Romans, glass windows only became common domestically in England in the early-17th century, gradually becoming more versatile and widespread as plate glass processes were perfected during the Industrial Age.

For more information see: Window.

There are a number of ways of classifying window types:


[edit] Frame material

[edit] Type of glass

For more information see: Glass.

[edit] Type of glazing

For more information see: Windows.

[edit] Cavity fill

  • Vacuum.
  • Argon.
  • Krypton.
  • Xenon.

For more information see: Windows.

[edit] Overall design

For more information see: Windows.

[edit] Method of opening

  • Awning: Hinged at the top and opened outwards.
  • Bi-fold: Made up of a number of individual sashes, usually 2, 3 or 4, hinged together.
  • Casement: An opening window fixed to the frame by hinges along one of its edges.
  • Fixed light: A window that is fixed in place and cannot be opened.
  • Louvre: A series of parallel pieces of glazing that are hung on central pivots.
  • Pivot: Hung on one hinge at centre points on each of two opposite sides allowing the window to revolve when opened.
  • Sidehung: A variation on a casement window, side opening controlled by tracks and slides.
  • Tilt and slide: Tilts inwards at the top and slides horizontally behind the fixed pane.
  • Tilt and turn: Include a mechanism that allows them to tilt inwards from one edge or to open inwards from one side.
  • Topguided: Tracks and slides enable the top to slide downwards whist the bottom opens out.
  • Vertical slider / sash: Glass is fitted in ‘sashes’ (moveable panels) that slide vertically past each other.

For more information, see Domestic windows.

[edit] Window Energy Rating

The Window Energy Ratings (WER) is a scale developed by the British Fenestration Ratings Council (BFRC) to measure the thermal performance of windows. The BFRC label indicates the rating of the window on a scale running from A+ (the most energy efficient) to G (the least efficient).

For more information, see Window Energy Rating

[edit] Style

See: Architectural styles.

[edit] Related articles on Designing Buildings Wiki.

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