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Window Size for Bedroom (Complete Guide)

Windows do more than just let in light – they improve the aesthetic of a bedroom too. But it’s crucial to find the right window size for your bedroom, as not any would just do. You don’t want a huge frame, while the opposite would also look weird. 

On the bright side (pun intended), you can find all sizing related information on windows here. 

Window Size For Bedroom:

The size and shape of a window vary from type to type. In general, the standard size of a window in a bedroom is 24” x 36” inches. Most manufacturers have these measurements in range and can install it for you. However, the standard size also depends on the bedroom dimensions.

Depending on the kind of window that would suit your room the best, the type and size of the frames will be considered “standard” for your bedroom. And the type of window frame will determine the standard size. 

Hung Windows:

You can go for either single or double hung windows. They usually come in a standard size range of 24 to 48 inches. This window is also available in 24” x 36”. 

But the height and width of the windows can be altered according to the size of your room, the brand of window and which manufacturer you’re going with.  

Most standard bedrooms look the best with this type of windows, as they don’t take up too much horizontal space. Hung windows are ideal for bedrooms on the smaller side. 

Picture Windows:

If your bedroom is on the larger side, and you would like an abundance of light and view, then picture windows are for you. These frames are usually available in a size of 24” x 96”, which is actually huge! 

Such windows allow you to have a clear view of the outside, and also let in tons of light. However, you can also tweak the sizing to your likings if you custom make them.

But note that picture windows are not made for opening, as they are just installed for aesthetic benefits. 

Casement Windows: 

Old homes typically house casement windows for bedrooms, as the sizing is moderate and convenient for the dimensions. 

Double casement windows have a standard size of 24” x 48”, but can also be 36” x 72”. Depending on the measurements of the bedroom, you can opt for either frame sizes. Note that casement windows need to be installed side by side horizontally.

So they are not ideal for bedrooms with narrow walls, as you need quite some space to install them. 

Bay Windows:

Such windows fall on the larger end of the spectrum, as their standard sizing is 42” x 36”. You can find them for even larger sizes too, but that is only if you choose to custom make the windows. 

These windows are perfect for spacious bedrooms, with wide walls. Similar to picture windows, bay windows let in enough light to keep your room highly illuminated throughout the day. 

This allows you to enjoy as much sunshine from the comfort of your bedroom. If you want more area coverage, you can go all the way up to 72” x 120”. 

Sliding Windows: 

The standard measurements of these windows are 24” x 36” too, similar to hung windows. They are perfect for bedrooms as they’re wider and take up less vertical space. 

If you are someone who does not want excessive light to pass through your bedroom window, this type of window is perfect for you. And, because of their standard size, they don’t take up too much area on your walls either. 

Awning Windows:

Ideal for smaller bedrooms with narrow walls, awning windows have a standard size of 20” x 24”. They open from the top and can be retracted again from below, making them a great choice if you want minimum lighting. 

Due to their small size, awning windows can be installed directly next to your bed frame, giving you a better view of the outside. You can also include other types of windows in your room, to pair with this type of frame. 

Type of Bedroom WindowStandard Height (in)Standard Width (in)
Hung Windows36 to 60 inches24 to 48 inches
Bay Windows36 to 60 inches36 to 120 inches 
Casement Windows24 to 60 inches 12 to 24 inches
Picture Windows12 to 96 inches 24 to 96 inches
Sliding Windows24 to 60 inches36 to 84 inches
Awning Windows12 to 84 inches24 to 36 inches

Do Bedroom Windows Have To Be A Minimum Size?

In short, no. There is no minimum size “requirement” to window for bedrooms, as you can even custom make it

However, there is a minimum “range” of size, which still ends at 24” x 36”. But homeowners can tweak the height and width of the frame as they like. As a result, you can go higher and wider according to your aesthetic preferences. 

For many years, buyers have had a misconception to choose windows that were a minimum size only. However, over the last few decades, home buyers have become more interested in windows that allow them to make the most of their space without being cramped. 

Some of the newer windows, such as bay windows and awning windows, have smaller window dimensions than traditional windows, allowing homeowners to make the most of their space without sacrificing their views or their privacy.

Bedroom Window Size Code Requirements:

Most people do not realize this, but in the United States, builders must meet stringent window size and sill height requirements when designing bedrooms. 

These rules are designed to ensure that bedrooms are comfortable and safe for people to sleep in, but they also make it much easier for builders to meet minimum insulation requirements.

The minimum size requirements for bedroom windows in the United States vary by state, California, for example, requires that bedroom windows be at least 42 inches wide

In Washington D.C., however, window size requirements are slightly smaller, at 40 inches in width. But in most states, the requirement is much lower, at 24” x 20” only. 

If you’re planning on building a new home, it’s important to know exactly what the code requirements are for your area so you can plan your renovation accordingly.

How To Determine Window Size For A Bedroom?

Choosing the right window size will determine the amount of light and ventilation that enters the bedroom. This will also impact the atmosphere of the room and how comfortable it feels. You can determine the size in a few ways –

Room Dimensions:

The first thing you need to consider is the space you have to work with. Are you able to change the dimensions of the room? If so, you may want to increase the size of the window. 

However, if you are unable to change the dimensions of the room, you may want to keep the window dimensions the same, or go even smaller (but that’s not too wise). 

Room dimensions are the measurements of space, and knowing the right ones for your space will help you choose the right window sizes for your bedroom. Measure the length, width, and height of your room to determine the correct dimensions for your window sizes.


If your bedroom is small and cramped, with no source of natural lighting, a larger than traditional window can make the room seem bigger. In that instance, experts recommend opting for a 36” x 48” sized frame, set possibly on the East side. 

In some cases, the windows in your bedroom can make or break a design. For example, if your window is too small, it will make it difficult to cool your bedroom during warm months. 

On the other hand, if your window is too big, it will let too much heat into your bedroom during the colder months.

Consult Manufacturers:

Manufacturers set different size ranges for their supplied windows. As a result, no two windows of different brands will have the same measurements. When decorating your bedroom, consult with your chosen manufacturer and seek information on custom making windows. 

Type Of Window:

The type of window you choose also has specific measurements that need to be considered. For example, picture windows can be as huge as 72 inches in both ways! 

However, double hung windows come at a decent size of 24” x 48”, which is slightly larger than the standard size mentioned above. Depending on the style and type of window, it might be better to choose a different size, which can affect the look of the room. 

Final thoughts

The standard size of windows for bedrooms is generally 24” x 36”. But other factors such as room dimensions, ventilation requirements, and also window type can also play a role. Do check out the bedroom window size code in your state before opting for a certain window size.