What Are Standard Window Sizes?

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Like many home fixtures, windows come in different shapes, styles, and sizes. This variety can make it difficult to shop for new or replacement windows because you may end up with windows that don’t fit. This is why manufacturers make windows that fit in most homes. Knowing standard window sizes can reduce the time spent measuring spaces and windows. In this article, we will break down everything you need to know about standard window sizes. 

What Are Standard Window Sizes?

Standard window sizes are fixed measurements for common window openings. Although it seems contradictory, standard window sizes vary depending on the type of windows. Additionally, the sizes also vary slightly from manufacturer to manufacturer. Nevertheless, the range of window sizes is usually consistent and this ensures a level of uniformity that custom-built windows lack. This is because the difference between manufacturer sizes is usually only about half an inch.

How Do Standard Window Sizes Work?

Although window sizes are measured in feet and inches, manufacturers do not outrightly label them as such. Instead, they have a coding system that incorporates both measurements into four numbers. For instance, let’s say you find your dream casement windows and the label says “2745”. The first two numbers, 27, represent the width which will be 2 feet and 7 inches. The last two numbers, 45, represent the height which is 4 feet and 5 inches. 

What Are the Types of Standard Window Sizes?

Here are some common windows and their standard window sizes:

Picture Windows

A picture window with a view of a city.

These are also known as fixed windows because they don’t typically open. Picture windows consist of a single glass pane and have no extra parts that slide or open. They are a great option for homeowners who prioritize natural light and are best for living rooms. 

The standard width sizes for picture windows range from a minimum of 24 to a maximum of 96 inches. On the other hand, the standard height sizes start from 24 inches and reach up to 62 inches. Other common standard sizes include:

  • 3 feet wide by 2 feet high (3020)
  • 6 feet wide by 4 feet high (6040)
  • 8 feet wide by 5 feet, 2 inches high (8052)

Double Hung Windows

Double-hung windows overlooking a garden.

Double-hung windows are the typical choice for modern homes because they work for most parts of the home. They have sashes that move up and down and are usually taller than wider. These windows also let in more ventilation than many other types of windows.

The standard widths for double-hung windows range between 24 and 48 inches, while the standard heights range from 36 to 72 inches. Some popular standard sizes are:

  • 2 feet wide by 3 feet high (2030)
  • 2 feet wide by 4 feet, 4 inches high (2044)
  • 2 feet, 8 inches wide by 4 feet high (2840)

Casement Windows

Just like double-hung windows, casement windows are typically taller than wider. They open from the side and swing outwards from a vertical hinge. This feature makes them great for areas of the home that require extra ventilation such as the kitchen and bathrooms. 

Casement windows with one opened outwards.

The minimum width for casement windows starts from 18 inches to 36 inches. They also have a minimum height of 18 inches and a maximum of 72 inches. Here are some common casement window sizes:

  • 2 feet, 3 inches wide by 2 feet, 3 inches high (2323)
  • 2 feet, 6 inches wide by 4 feet high (2640)
  • 3 feet wide by 6 feet high (3060)

Sliding Windows

Sliding windows are wider than they are tall, which distinguishes them from several other types of windows. They slide from side to side and open horizontally along a track. In some ways, they are a little similar to double-hung windows. 

The standard width ranges from 36 inches to 84 inches, and the standard height ranges from 24 to 60 inches. Common sliding window sizes are:

  • 3 feet wide by 2 feet high (3020)
  • 5 feet wide by 3 feet high (5030)
  • 6 feet wide by 4 feet high (6040)

Bay Windows

Bay windows usually consist of three windows merged into one, with one inoperable window and two operable ones. Because of their size, they tend to make rooms appear larger, making them a staple for smaller rooms. 

The standard window sizes for bay windows depend on the size of the three windows. Nevertheless, the standard width for bay windows begins at 42 inches and can go all the way up to 126 inches. The standard height is 36 inches up to 72 inches. 

Awning Windows

Awning windows opened outwards.

Awning windows have a hinge at the top that allows them to open outwards and let in extra ventilation. They are great for people living in rainy states because their angle allows water to slide right off. You can also keep them open while it rains which will provide needed airflow while keeping your home dry. 

The minimum width for awning windows is 18 inches while the maximum width is 72 inches. Common sizes include:

  • 3 feet wide by 2 feet high (3020)
  • 4 feet wide by 2 feet 4 inches high (4024)

Custom Window Sizes

Most older homes do not have rough openings that can accommodate standard window sizes. Therefore, such homeowners will either need to adjust their rough opening or order custom window sizes. These custom windows often cost more and have a longer production time. Additionally, homeowners may need to hire window installation services to properly install the windows and avoid any accidents. It is usually more cost-effective to purchase custom windows than to adjust existing window openings.

How To Measure Window Sizes

Man measuring the width of a window with a tape rule and pencil.

Windows are typically measured by width and height with the width measurement coming first. Both measurements are in feet and inches. You should take note of three major factors when measuring window sizes. The first is the rough opening which is the opening where your chosen window and its frame will sit. You will need to measure the width and height of the opening but note that the measurements that manufacturers use are usually ½ inch less.

The next measurement you need is the window width. To get the proper width, measure between the window jambs. Do this from the left, center, and right, and use the smallest measurement when ordering your windows.

To measure the window height, measure from the high point of the window sill to the top of the window opening. Ideally, you should also measure from the left, center, and right. You need the smallest measurement size of all three. 

Conclusion

Choose your dream window based on the amount of light, ventilation, and aesthetic you want for your home. Afterward, opt for one of the most common standard window sizes based on the type of window you settle for. This is much more affordable and less time-consuming than purchasing custom windows.

Replacing your windows or shopping for new ones does not need to be a hassle. With our explanation of standard window sizes and how they are calculated, it should be a breeze for you. 
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