What Size is a Standard House Window – 2024 Guide

When you build or remodel a home, there are a lot of things you need to worry about. One of the main things that will make the house perfect is the windows. They are not there only to make the home pretty, but they also let the light in that helps with our well-being. When choosing the right window for your home, you can get confused and if you make a mistake on the structural building part, you may end up with units that are too big or too small for the hole.

There are a lot of different types of casements, but the great thing is, many fit the standard size for a house window. To help you out with the dimensions and to teach you everything you need to know about these units, we created this guide. Continue reading if you want to find out what your options are and how you can choose between the best casements on the market.


Source: Pinterest

One thing you should always remember is that the opening for the casement should always be about half an inch wider than the unit itself. The reason for this is that the unit can be easily placed in the opening, without doing any damage to the casement or the wall itself. If you are doing the home remodeling on your own, you should always have these calculations in your mind, and if you’ve hired a contractor, then they probably know about this.

Depending on the type of unit that you choose, your contractor will give you a number about the height and the width of the unit that can be put in that hole. That number is made usually of four digits and now we are going to tell you what they mean. If you are supposed to get a unit that has the 3438 numbers, then you are looking for a casement that has a width of 3’4” and a height of 3’8”. As we mentioned before, the unit needs to be half an inch smaller than the opening, so the product you are going to purchase will itself be smaller than the original dimensions.

Now we are going to talk about some of the standard casements you can find on the market and the dimensions for those types.


Source: Hampstead Windows & Doors

When we say classic, we mean the standard sash type that can be seen in most of the houses. These windows have been around for ages, and they are usually compared with the Victorian age. The original width of these units is about 4 feet, but when it comes to building modern houses, you can find them in smaller sizes as well.

When it comes to the width, you can usually choose between 36 and 84 inches, or 91 and 213 centimeters. You can usually get a sash type unit made, depending on the width, but you should also consider the height. The standard height dimensions vary between 24 and 60 inches or just about 61 and 152 centimeters. Talk to your contractor about the right sizes for your home.

Double Hung

Source: Pella Windows and Doors

This is another classic shape that we can notice in most of the houses nowadays. As the name suggests, these units are double in size and they are probably one of the most practical ones. You can play around with different hinges and features, but the sizes are pretty much standard.

Before choosing the final unit and size for your space, you need to find a manufacturer that will be able to provide the best quality. WDMA is a corporation that works closely together with a lot of manufacturers and factories to provide everything their clients need. When cooperating with a company like that, you will be able to choose the right casements for your house depending on your budget and your needs.

As we mentioned, the double-hung windows are one of the most popular options and they come in different standard sizes. The height usually ranges between 36 and 72 inches or 91 to 182 centimeters, and the width varies between 24 and 48 inches, or 60 and 121 centimeters.


Source: Pinterest

These are one of the most beautiful units you can put in your home, and they also have the name of picture casements. People love them because they offer the most natural sunlight, and you can also play around with the design and additional features.

These are one of the most versatile types of windows, so you are free to choose between a lot of different sizes. The width usually varies between 2 and 8 feet or 60 and 243 centimeters, and the height can range from 2 and 8 feet, or you can also get custom casements made that can go up to 62 inches or 157 centimeters.

Other more common types of casements include the hinged type that varies between 2 and 6 feet. These are usually smaller than the other types, but they are loved by many. You should also look into the sliding casements and they range between 36 and 84 inches for the width and 24 to 60 inches for the height.

To choose the right casement for your home, you first need to think about the room you are choosing the windows for. Depending on the room, you will narrow your choices down, and then you will only need to think about the preferred size and type. For example, for the bathroom, it is best to get something like the hinged or sliding units, and for the living room, you can choose the fixed units, bay, or sliding sash casements.

In case you are not sure what you should get and how it is going to look in your home, you can always ask for a 3D image of your home, and see which ones are the best windows for it. Talk to the manufacturer, and see what they have to offer. You can also hire an interior designer that will help you choose the best units in your home. The decision you are making now is going to affect every aspect of your future life, so choose casements that look good, are durable and that will look aesthetic compared to the rest of the space.