Windows are an integral part of any home, serving both functional and aesthetic purposes. However, not all windows are created equal, and their size and design can vary greatly depending on the room they're installed in. Every room has a specified standard window size because of the different uses of different spaces in a home. When buying windows, it is important to consider not only the material but also the room in which the window will be installed to pick the correct window size for a particular space. In this article, we'll explore the most common standard window sizes for different rooms, including basement egress windows, bedroom windows, bathroom windows, and kitchen windows. We'll also discuss the differences between standard and custom window sizes and how to read window sizes.

 Hot Sale Size(in")
Width Height Size
24 24, 36, 48, 60, 72 24x24, 24x36, 24x48, 24x60, 24x72
30 30 30x30
32 36, 48 32x36, 32x48
35 35 35x35
36 24, 36, 48, 60, 72 36x24, 36x36, 36x48, 36x60, 36x72
40 60 40x60
48 36, 48, 60, 72 48x36, 48x48, 48x60, 48x72
60 36, 60 60x36, 60x60
72 36, 72 72x36, 72x72

Basement Egress Window Sizes

Basement egress windows are a legal requirement by the International Building Code for finished basements that serve as living spaces. These windows serve as an emergency exit in case of fire or other hazards. Although egress window size requirements vary by state and municipality, the minimum size requirement for egress windows is 5.7 square feet, with a minimum width of 20 inches and a minimum height of 24 inches. However, if the window is situated at the grade floor or below it, an exception permits for 5.0 square feet. These dimensions are the bare minimum and should be considered a starting point. For practical purposes, it's recommended to install larger egress windows to allow more natural light into the basement and to make the space feel less like a dungeon.

The size of the window well outside should also be considered when establishing the dimensions of the basement windows. The window well needs to have enough clearance to allow for escape in the event of a fire or other emergency.

When building basement egress windows, it is essential to verify the local codes in your area as they vary depending on the locality.

Standard Bedroom Window Sizes

Bedroom windows are typically smaller than those in other areas of the home, but their size can vary depending on the room's location and the building's construction. Bedrooms on higher floors of your home might follow the same rules that apply to basements. At least one window in the bedroom ought to be big enough to escape through in case of emergency unless the bedroom has a door that leads outside. In general, standard bedroom window sizes range from 24 inches by 24 inches to 36 inches by 36 inches. These dimensions provide adequate natural light and ventilation while still maintaining privacy but be sure to verify the state-specific code for your area. For larger bedrooms, it's common to install multiple windows or to install windows with a larger height-to-width ratio to create a more open feel.

Bathroom Window Sizes

Bathrooms require windows that offer both natural light and privacy. The standard size for a bathroom window is typically 24 inches by 36 inches and can be opened halfway otherwise your bathroom may require a mechanical ventilation system. Although this size allows for privacy, it is important to note that bathroom windows should always be frosted or obscured to prevent anyone from seeing inside.

Kitchen Window Sizes

Kitchens windows should provide ample natural light and ventilation because of activities like cooking and doing dishes, while still offering privacy and security. Although there are no specific codes that apply to kitchen windows, the standard size for kitchen windows is typically 30 inches by 36 inches, but larger windows may be installed to provide more light and a better view of the outside. It's also common to install bay windows or garden windows in kitchens to create a more open feel and to provide additional shelf space for plants or other decorative items. For kitchen window sizes, we advise deciding on a typical size after determining the kind of window you want.

Standard vs. Custom Window Sizes

Most home improvement stores have pre-made standard window sizes that are easily accessible. Since they are the most prevalent and provide convenience and cost, most homeowners like these sizes. While standard window sizes are the most common, they may not always be suitable for every room in a home. In some cases, custom window sizes may be required to fit unique or non-standard spaces. Custom windows are made to order and can be manufactured in a variety of designs, sizes, and shapes to fit any space. Custom windows can be more expensive than standard sizes, but they offer more flexibility in terms of design and can enhance a room's overall aesthetic appeal.

How do you Read Window Sizes? 

Window sizes are typically written in two numbers, representing the width and height of the window in inches. For example, a window size of 24 inches by 36 inches would be written as "24x36." The width is always listed first, followed by the height. In some cases, a third number may be included to represent the window's depth or thickness.

A four-digit notation may also be used by window manufacturers to describe window sizes. The window's width and height are represented by the first two values, respectively. A window with the number 2436, for instance, is 2 feet 4 inches wide and 3 feet 6 inches tall. The window size remark may also refer to the proposed window's framed or rough opening. When reading window sizes, make sure to check and see if the size refers to the opening or the precise size of the window.


Understanding standard window sizes by room is essential when planning a home renovation or construction project. Standard sizes are the most common, but custom sizes may be required to fit unique or non-standard spaces. It's important to work with a reputable window installer and specialist to ensure that the windows you choose are the right size and style for your home's needs. By taking the time to carefully assess your options and needs, you can enjoy the benefits of beautiful, functional windows that enhance your home's value and appeal for years to come.

May 10, 2023 — YanJoanne