Whether you are on the hunt for new windows for your home or in the process of building a home, it can be helpful to understand the standard window sizes. All different types of windows can be ordered a custom, but this will significantly increase the total cost. Instead, it makes sense for homeowners to at least be aware of the standard window sizes and how this process of obtaining proper window measurements works.

Looking to start the process of window installation on your home? Check out the top providers below to get a free quote.

What is a Standard Window Size?

A standard-size window is a window of a set dimension that will fit into a rough opening in a home. The window height and width of standard windows will vary depending on the type you purchase.

Window styles impact the total width and height of the standard windows. Something like a bay window will require a large window opening over a double-hung or single-hung window.

Standard Size Window Guide

When looking at window styles, you are going to notice that each of the windows has a four-digit code after it. This code is used to help you identify standard-size windows. If a standard window is 2’ x 3’, you will see this coded as a 2030 window.

This number is not specific to one brand of windows, so you will see it used throughout the industry. If you see a window that is 3440, that would mean 3’4” x 4’. In our standard window size chart, you can see that we have given you the height and width range for all standard-size windows.

Remember that some window manufacturers will have a larger selection than others.

Standard Window Sizes Maximum and Minimum Height and Width

Window TypeMinimum HeightMaximum HeightMinimum WidthMaximum Width
Picture Window12”96”24”96”
Sliding Window24”60”36”84”
Bay Window36”78”42”128”
Casement Window2’5.5”6’5.5”1’2”2’11.5”
Awning Window1’8”7’8 ⅞”24”3’10 ⅛”

Double-Hung or Single-Hung Windows

Double-hung windows are the most common type for homeowners. The windows have two operating sashes, so you will get better ventilation across the room. The double-hung windows allow for quick and easy cleaning of the home.

Double or Single-Hung Window Sizes (Standard Dimensions)

DimensionsCommon Code/Name
2’ x 3’ft2030
2’ x 4’4”2044
2’8 x 4’2840
2’8” x 5’2”2852
4’ x 6’4060

Double-Hung or Single-Hung Standard Window Sizes

The double-hung window ranges in height from 36 to 72 inches and in width from 24 to 48 inches. Some of the most common double-hung window sizes include 2840 or 2030 windows.

Double-hung windows are available from most brands and tend to have pricing that starts around $150 per window and increases to more than $600 for standard window dimensions.

Single-hung standard window sizes will be the same common window sizes that you find in the double-hung; the only difference you will come across is the functionality of the window itself.

  • Double-Hung or Single-Hung Window Brands: Renewal by Anderson, Champion, Simonton, Pella, Castle, Marvin, Milgard, Home Depot
  • Where to Install Double-Hung or Single-Hung Windows: Living room, bedroom, hallways, newer and older homes, kitchen, and more.

Picture Windows

Picture windows allow the most light into the room. These are the best windows if you don’t care about opening the window but want to let a lot of natural light into the room. One of the things that you will notice about the window frame options for picture windows is that they are all considerably large.

Most common window types do not need to be quite as large. They don’t serve the same purpose as picture windows. The common widths for these windows start at around 2ft and then go up to 8ft. The heights start at 1ft and go up to 8ft.

Most of the time, the size of the window used in homes that require picture windows will be considerably larger than the standard window width and standard window height.

Picture or Fixed

DimensionsCommon Code/Name
3’ x 2’3020
5’ x 3’5030
6’ x 4’6040
4’ x 5’4050
8’ x 5’4”8054

Picture Standard Window Sizes

The picture window width range starts at around 24” for standard and goes up to 96”. The height starts at 12” and goes up to 96”. Although the size range for picture windows is a little more extensive than others, the pricing is still fair as these windows don’t need as much technology for opening and closing. Picture windows are also available in larger sizes or custom sizes, depending on the manufacturer.

  • Picture Window Brands: Renewal by Anderson, Champion, Simonton, Pella, Castle, Marvin, Milgard, Home Depot
  • Where to Install Picture Windows: Living room, dining room, hallways, front entrance

Sliding Windows

Sliding windows will open from side to side instead of up and down, as you find in the double-hung windows. The sliding windows are very easy to operate, but sliding window sizes are unique. The size of the window will be wider than other types simply because of the way that it functions.

Some homeowners will replace a single-hung window size with a sliding window, but the window installation may need some customization from a professional regarding the total width of the rough opening.


DimensionsCommon Code/Name
3’ x 2’3020
3’ x 3’3030
5’ x 3’5030
6’ x 4’6040
7’ x 4’7040

Sliding Standard Window Sizes

The sliding window width starts at 36” and goes to 84” in the standard sizes. The height ranges from 24” to 60” as the maximum. Every brand will have different pricing for the sliding windows, but most will start in the $250 range for replacement windows.

  • Sliding Window Brands: Renewal by Anderson, Champion, Simonton, Pella, Castle, Marvin, Milgard, Home Depot
  • Where to Install Sliding Windows: bedroom, bathroom, basement, dining room, kitchen

Casement Windows

Casement windows are hinged windows, and they can open from the side. These windows are beneficial when it comes to ventilation and some home improvement specialists like the way the casement windows look when it comes to classic styling in the home.

The casement windows will tend to stay a bit more narrow than some other windows; the way that the window functions by opening sideways mean there is a large piece of window glass swinging out away from the home, and it’s best that this is not as wide as something like a slider.


DimensionsCommon Code/Name
1’7” x 1’4”1714
1’7” x 2’5”1725
2’3” x 2’3”2323
2’9” x 2’9”2929
3’5” x 2’5”3525

Casement Standard Window Sizes

The casement window sizes start at 1’2” and go to 2’11.5” in width. The thing you will notice about casement windows is that they have more unique sizes when it comes to the standards. Where most window styles are simply 2’ x 3’, the casement has some unique size notations and options. The height range for standard casement windows runs from 2’ 5.5” to 6’ 5.5”.

  • Casement Window Brands: Renewal by Anderson, Champion, Simonton, Pella, Castle, Marvin, Milgard, Home Depot, Jeld Wen
  • Where to Install Casement Windows: Bedrooms, family rooms, areas that need extra ventilation and breeze

Bay Windows

Bay windows are expensive large windows that can help a new home truly stand out. This is more than just a way to let natural light into the house; it is an architectural design piece of any home. Adding a bay window to your home is a large project, likely large than a bow window, and although there are standard size options available, many homeowners need to choose custom bay windows.

Bay Standard Window Sizes

The bay windows have a width range from 3’6” to 10’6”. The heights range from 3’ to 6’. Many bay windows, even the standard sizes, will cost more than $1,000 per window.

  • Bay Window Brands: Renewal by Anderson, Champion, Simonton, Pella, Castle, Marvin, Milgard, Home Depot, Jeld Wen
  • Where to Install Bay Windows: living room, family room

Awning Windows

An awning window has a hinge at the top and allows you to open the window, even during a light rain. The awning windows certainly don’t allow for as much ventilation and cross breeze as others, but they are easy to use and can improve the look of the front of the home.

Awning windows are similar to casement windows in that there are some unique sizes for standard window replacement.

Awning Standard Window Sizes

The awning standard widths start at 2” and go to 3’10”. The heights range from 1’8” to 7’8” high. As you can see, it’s more common to have a high awning window than an overly wide one. This has to do with the way the awning window operates.

  • Awning Window Brands: Renewal by Anderson, Champion, Simonton, Pella, Castle, Marvin, Milgard, Home Depot, Jeld Wen
  • Where to Install Awning Windows: living room, bedroom, sunroom

Skylight Windows

Skylight windows are a bit tricky to install because you also have to take into consideration the slope of the roof. In addition, there are both dome skylights and rectangular skylights. Some will be fixed, and others will be vented. There are a few standard sizes available, but many of these have to be custom ordered.

Skylight Standard Window Sizes

Dome skylights come in 4, 6, 8, 10, 12, or 14-inch sizes. Rectangular or fixed skylights come in sizes from 14-72 inches in width and 16-96 inches in length. Some commercial manufacturers will make large skylights that can be ordered customarily or larger. Energy efficiency in a skylight is a very important feature to consider.

  • SkylightWindow Brands: Velux, Sun-Tek, US Sunlight, Solar, Skyview, Fakro
  • Where to Install Skylight Windows: kitchen, bedrooms, living rooms, dining rooms

Custom Window Sizing

If our guide detailing all of the window sizes available still does not create a solution for your home, then a custom window size is worth considering. These custom window sizes can be as large or small as you would like as long as they are structurally sound and something that a company has the facilities to manufacture.

Expect custom windows to be a bit more expensive than standard. In addition, be ready to do a bit more work when it comes to framing, trim, and final details when installing a nonstandard-size window.

How to Measure What Size Window You Need

Correctly measuring the size of your window can make or break your window replacement project. If you know you have standard windows, this process becomes quite a bit easier. The window’s width and height need to be measured carefully before ordering.


With a tape measure, you will measure the inside of the jamb from one side to another. It is imperative to repeat this measurement on the bottom, middle, and top of the window. When you have these three measurements recorded, you will have to go with your shortest measurement to ensure the new window will fit. Many times the shortest width is the middle width.


The height of the window is measured from the head of the window to the windowsill. The head is the top fixed frame piece, and the bottom is the fixed frame piece or the windowsill. You will again need three measurements here the left side, the right side, and the middle. The smallest measurement is the one to write down and record.

Final Thoughts

With modern technology, homeowners do not need to be limited by standard window sizes. You can choose various sizes that work for your home and have them custom ordered to your needs. However, it’s important to remember that costs will be significantly lower when dealing with standard window sizes as opposed to custom. When measuring for replacement windows, chances are you have a good amount of standard windows in your home, so measure twice if you find something that doesn’t seem right.

Frequently Asked Questions

What is a standard bedroom window size?

Standard bedroom window sizes are 24” x 36”.

Can I customize my window size?

Window sizes can be customized within reason. Many window manufacturers offer both standard and nonstandard options, and the nonstandard is considered custom.

What is the average window size?

The average window size is 24” x 36”; this is a typical size for double-hung or single-hung windows.

Are replacement and new construction windows the same?

Replacement windows can sometimes be placed in place of existing windows without framing or construction around the windows. However, new construction windows need all of the outside framings to be put into place. Sometimes replacement windows that have rotted frames will also need this done, and that is a much bigger project.

How do I know what size window I need?

If you like a DIY project, you can measure a window yourself, but sometimes you can have a representative from a window company come to your home and check the sizing of the windows you need.

Editorial Contributors
Britt Olizarowicz

Britt Olizarowicz

Britt Olizarowicz is a former real estate agent and landscaping business owner. She has a wide range of experience across several industries and was also a professional golfer. With her experience in investing, renovating, and improving properties Britt loves to share in all of the latest and greatest technologies, systems, and strategies to keep your home and garden looking great.

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Lora Novak

Senior Editor

Lora Novak meticulously proofreads and edits all commercial content for Today’s Homeowner to guarantee that it contains the most up-to-date information. Lora brings over 12 years of writing, editing, and digital marketing expertise. She’s worked on thousands of articles related to heating, air conditioning, ventilation, roofing, plumbing, lawn/garden, pest control, insurance, and other general homeownership topics.

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