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Standard Window Sizes

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What is a Standard Window Size?

When you’re shopping for new replacement windows, you’ll probably notice that most of them are available in a few consistent size dimensions. These windows are designed to fit into the most common rough opening sizes in homes. They won’t work for every window replacement, but it makes sense for manufacturers to produce windows that will work for most homes. To avoid paying a premium on custom windows, stick to standard window sizes when possible. The cost of installing new windows will vary by the size and replacement window types you choose.

What Size Window Do I Need?

Window manufacturers will use a simple size notation for replacement windows to help you identify the size needed for your rough opening. A window’s size notation is basically width and height combined. The first two #’s are for width and the second two #’s are for height.  A 2426 Replacement Window would have a width of 2’4″ and height of 2’6″. The actual measurements of the window are usually 1/2 inch less than the whole number identifier it is labeled as.

  • For example, a window marked to fit a 44″ x 44″ opening will actually measure around 43 ½” x 43 ½”. That’s because the manufacturer adds half an inch to each of the size dimensions so the window can be installed with ease. You may also be interest in learning how to measure your windows on your own.

Double Hung Window Sizes

Double hung windows are the most common type of replacement window in the United States. They come in a wide range of sizes to fit any rough opening. They are often found in the bedroom, kitchen, hallways, and all over the house. Double-hung window width can be anywhere from 24 to 48 inches. A double hung window’s height can range from 36 to 72 inches. 

  • Double Hung Width: 24″ min  to 48″ max
  • Double Hung Height: 36″ min to 72″ max

new double hung windows

Double-Hung Window Size Chart: 

standard double hung window measurements

Picture Window Sizes

Picture windows are designed for architectural appeal and for allowing more light into a home. Most of them don’t open, so they can be built in a wide variety of sizes and are often found in the living room, kitchen and more. If you’re considering installing picture windows, you have a lot of options from small to large aesthetic windows. If you have an opening that fits one of these window dimension below, you can likely install picture windows without needing to custom order them. The most common widths for picture windows are 2 ft, 3 ft, 4 ft, 6 ft, and 8 ft. Standard picture window heights can range from 1 ft to as tall as 8ft. 

  • Picture Window Width:  24″ min to 96″ max
  • Picture Window Height: 12″ min to 96″ max

replacement picture windows

Picture Window Sizes Chart:

standard picture window measurements

Sliding Window Sizes

Sliding windows are often installed in the bedroom, bathroom, basement, kitchen, or other areas of your home. Slider windows are wider than they are tall. If your window dimensions fit into this range, you can install a standard sliding glass window and have it replaced without needing special customization to the rough opening.  Sliding window horizontal widths are available in 36in, 48in, 60in, 72in, and 84 inches. Sliding window heights available are 24in, 36in, 48in, and 60 inches tall.

  • Sliding Window Width:  36″ min to 84″ max
  • Sliding Window Height: 24″ min to 60″ max

replacement sliding windows

Standard Slider Window Size Chart

sliding window standard measurements

Bay Window Standard Sizes

Bay windows open up your space, add architectural detail and capture more light and beauty than your standard window ever could. Adding one bay window to a room can help enhance its space and its beauty all at the same time. It’s a major improvement to any home and for the right space it’s a worthy investment. Standard bay windows widths range from 3 foot 6 inches to 10 foot 6 inches.  Bay window heights range from 3 foot to 6 foot and 6inches tall. If you were looking for something larger, you would want to look at custom sizes for bay windows which will be an additional cost and can range up in to the $650 per window range.

  • Bay Window Width: 3’6”min to 10’6” max
  • Bay Window Height: From 3’ min to 6’6” max.

new bay window

Casement Window Sizes

Hinged windows that open from the side also known as replacement casement windows, and they’re good for homes in warm areas that rely on breeze for ventilation and comfort throughout the year. They’re more effective for ventilation purposes than double or single hung windows, and they’re comparable in price. Casement window sizes range 1 ft 2 inches to a 2 ft 11.5 inch width. Casement windows height range from 2ft 5.5 inches to a maximum of 6 ft 5.5 inches tall. 

  • Casement Width: 1’ 2” min. to 2’11.5” max.
  • Casement Height: 2’5.5” min. – 6’5.5” max.

replacement casement windows

Awning Window Sizes

Awning windows are hinged at the top and open outward, allowing for ample ventilation. Awning windows are often used with other window styles and are easy to open and close. They can be opened even during a light rain and are considered weatherproof. A standard size awning window could have a width from 2″ to 3’10”. The standard heights available are usually 1’8″ to 7’8″ high.

  • Awning Window Width: 2′” min to 3’10 1/8″
  • Awning Window Height: 1’8” min to 7’8 7/8″ high

awning window installation

Custom Size Windows

If you can’t locate standard sized windows to fit into the rough openings of your home, you have two options. The first is to adjust the size of your rough opening to accommodate a standard window. This is often the best option if the adjustments aren’t difficult.

The second is to order custom windows through a supplier like Lowes, Home Depot, or a local window company. You’ll give your window measurements to an associate and decide what frame material and glass you want for your specific window type. The supplier will help you figure out which companies can complete the order for you. You’ll then select the company, pay for the windows and wait for your order to be filled.

After the order is in, you’ll wait several weeks for the windows to be manufactured and shipped. You can either have the windows delivered to your home or go and pick them up. You’ll be responsible for finding a local window contractor to install them for you unless it was included in your purchase agreement

big living room window

Older homes are especially well known for needing custom sized windows. This is because they were built before windows were being produced in mass quantities, so their windows often have odd dimensions that don’t fit standard window sizes. Dealing with custom windows is more time consuming, and there are more decisions to be made. You’ll also spend a great deal more money than you would with standard windows. But the benefit is that custom windows are tailored specifically for your home.


Frequently Asked Questions

What size is a standard bedroom window size?
A standard window size for a bedroom window depends what type of window you have installed or are needing replaced in your bedroom. Most homes are fitted with single hung or double hung bedroom windows. If this is the case, it's quite likely your bedroom windows are one of the following sizes:
  • 24 in. x 36 in.
  • 24 in. x 46 in.
  • 28 in. x 54 in.
  • 28 in. x 66 in.
  • 28 in. x 70 in.
  • 34 in. x 46 in.
  • 34 in. x 62 in.

The cost of a replacement window will vary greatly based on your bedroom window's size. if you don't know what to expect for window installation prices, it may be smart to use a windows cost calculator to get a local price estimate on a particular window type with a specific window frame material in order to prepare for your replacement window project and budget accordingly - even if it is a DIY project.
How do I know what window size I need?
When shopping for new home windows, window manufacturers and contractors will use a simple size notation for replacement windows to help you identify the size needed for your rough opening.

A window’s size notation is basically width and height combined. The first two #’s are for width and the second two #’s are for height.
  • A 2426 replacement window would have a width of 2’4″ and a height of 2’6″. The actual measurements of the window are usually 1/2 inch less than the whole number identifier it is labeled as.
Measuring windows for accurate sizing can often get confusing if you have not done so before. A window contractor near you will be more than willing to come out to your home and give you the most accurate cost estimate for each window size that you need.
Are replacement windows sized the same as new construction windows?
As new construction windows are designed to be installed into brand new homes
Replacement windows can easily be placed in an existing location and sized for where your old windows were installed. New construction windows will have new nailing attachments or attached flanges or fins that are best suited for new home window openings. You'll be able to find more standard window sizes for other window types above as well as the ability to get in touch with local contractors to help you size and replace your windows without the hassle.
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