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Comprehensive Guide to the Parts of a Window - Everything You Need to Know No BS!

Why is this article different than the others you probably found?  Well, this stuff is pretty universal and super ZZZZ 'snoozy' but its a great explainer.  And its coming from your favorite window dudes!

parts of a window


Understanding the Different Parts of a Window

Windows are a crucial part of any building. They provide natural light, ventilation, and a view of the outside world. However, many people may not know the different parts that make up a window. In this article, we will break down the different components of a window and their functions.

The frame is the outermost part of the window that holds everything in place. It can be made of various materials such as wood, aluminum, vinyl, or fiberglass. The frame provides support for the window, protects it from the elements, and helps to keep it in place.


The sash is the part of the window that holds the glass. It can be opened or closed depending on the type of window. Single-hung and double-hung windows have two sashes, while sliding windows have one or two sashes that move horizontally. Casement and awning windows have one sash that opens outward.


  • Glass

The glass is the most prominent part of the window, and it is the component that allows light to enter. It can be made of different types of glass such as tempered, laminated, or insulated. The glass can also have special coatings such as low-e that improve energy efficiency and reduce glare.


  • Pane

The pane is the individual sheet of glass within the window sash. The number of panes varies depending on the type of window. Single-pane windows are not as energy efficient as double or triple-pane windows. The spaces between the panes can also be filled with gas such as argon or krypton to improve insulation.


  • Grilles

Grilles, also known as muntins or window panes, are decorative elements that divide the window into smaller sections. They can be made of wood, aluminum, or vinyl, and can be fixed or removable depending on the type of window.


Weatherstripping is a material that is used to seal the gaps between the window sash and the frame. It helps to prevent air leaks and improve energy efficiency. Weatherstripping can be made of materials such as foam, vinyl, or metal.

Window balances are the mechanisms that counter the weight of the sash and hold the window up in place.  These can also help in proper weather seal with properly installed parts. 


Windows are made up of several different components that work together to provide natural light, ventilation, and energy efficiency. Understanding these different parts can help you make an informed decision when choosing windows for your home or building. We hope this article has been helpful in breaking down the different parts of a window and their functions.  Call us for more info!

For a more in depth description of a tilting window, check out this blog!

Updated on 05 Jan 2024