What is a Double-Hung Window?

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  • Written By: J. Beam
  • Edited By: Bronwyn Harris
  • Last Modified Date: 04 December 2018
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A double-hung window is a window that features an upper and lower window sash that slide vertically past one another in a single casement. Perhaps one of the most traditional styles of windows, this type of window typically features the lower sash in front of the upper sash. Each sash may be a solid pane of glass or may be divided into separate lights by built-in muntins or for decorative purposes, may have a snap-in, removable grid to create the illusion of separate lights.

A double-hung window is designed with two grooves in the side jambs that allow each window sash to slide separate from one another. Some have a full window screen, allowing for ventilation from the top or bottom of the window at any time, while others have only a half-screen that needs be positioned accordingly. The ability to have a ventilation area equal to half of the window’s total area is one reason the double-hung design is so widely used.

This style of window is also a popular choice for replacement windows. It is valued primarily for its versatility. Some of the features that modern double-hung windows have include insulation for improved energy efficiency, tilt-in sashes that make cleaning the outside of the window easy, and UV protection.


In addition to versatility, double-hung windows are also stylish. They are available in vinyl and wood casements and additional features, such as transoms, can be used with them. Additionally, a double-hung window can be arranged in different ways. Single window units can replace a worn out or dysfunctional window. In groups of three or more, double-hung windows fill larger wall space while maintaining the ventilation and versatility that are lacking in a picture window.

The installation of a double-hung window is fairly quick and simple and can be done by both an experienced do-it-yourselfer or by a professional. A professional window company can typically replace all the windows of an average home in under two days time. While replacement windows of any kind will add value to a property, a double-hung window is almost a guaranteed value because it is both a stylish and functioning window.


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Post 5

Thanks for a peachy article. I've improved the 1940 vintage casements in our housing as easily. They are prefab and really good, and aren't any worse for their 70 years. I learned a gimmick for sealing: Put a bead of caulk on the pane. When the pane closes, it "squishes" the caulk and makes a better seal. Wipe off the extra caulk. You now have a form-fitted gasket. Since the steel construct is already stronger than any storm window border out there, I simply put 1/8" paint artifact cut to the dimensions of the old pane surfaces- one crosswise and two flanking. They virtually conceal the gasket. This has improved elegance of our windows. Thanks again for the article.

Post 4

Cunningham Contracting did an awesome double hung window job for me! They're located in Maryland.

Post 3

I used Distinctive Design and Remodeling in Virginia to replace 14 double hung windows in my town house. They did a great job and had the entire project done in four weeks.

Post 2

when were double hung windows invented or when did they get onto the market?

Post 1

Why are sash windows predominantly painted white?

Is it a historical style statement or a functional reason of clearer view across small pieces of glass?

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