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How to Measure a Home Window? – Standard Window Sizes 

When you go to the local home improvement store, you’ll see window sizes listed in whole number dimensions. Just because you see a window designed to fit a whole number size measurement doesn’t mean that the window has exact whole number size dimensions. 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.


Standard Window Size Rough Openings

It’s simple to order windows in custom dimensions, but it’s also quite expensive compared to the standard windows that you’ll find on the shelves. That’s because they aren’t produced in large quantities—and in some cases, they actually have to be crafted specifically for you.

  • If your home has standard rough openings, you can choose from a variety of pre-made windows that can be put right into those openings.

If you don’t have standard openings, you can adjust the dimensions of your existing openings to make them standard. Generally, it’s easiest to reduce the size of your opening by adding wood to the window frame, but the frame can also be expanded with new headers to meet any size that you want. If you’re tired of relying on custom windows, simply adjust the openings to a more standard size and start shopping the available standard window size options. If you choose to go this route, though, be aware that it’s best to have the help of a professional window installer.

Standard Double Hung Window Sizes

double hung windows

Double Hung Window Widths: From 24″ to 48″ 

Double Hung Window Heights: From 36″ to 72″

Double hung windows are the most popular type of standard window in the United States. They come in a wide variety of standard windows sizes to choose from, they are often found in the bedroom, kitchen, hallways, and all over the house. Here are the most common widths and heights:

Standard Picture Window Sizes


Standard Picture Window Widths: From 24: to 96″ 

Standard Picture Window Heights: From 12″ to 96″

Picture windows are designed for architectural appeal and for allowing more light into a home. Most of them don’t open, but they’re built in a wide variety of standard sizes and are often found in the living room, kitchen and more. If you’re considering picture windows, you have a lot of options. If you have an opening that fits one of these window dimensions, you can likely install picture windows without needing to custom order them.

Standard Sliding Window Sizes

sliding windows

Standard Sliding Window Widths: From 36″ to 84″ 

Standard Sliding Window Heights: From 24″ to 60″ 

Single sliding windows are less common, they can be found in the bedroom, bathroom, basement, kitchen, or other areas of the home.Slider windows are wider than they are tall. If your window dimensions fit into this range, you can pick up an off-the-shelf slider and have it installed without special ordering. They are offered by a wide variety of window manufacturers and come in standard sliding window sizes including:


Standard Bay Window Sizes

bay windowStandard Bay Window Width: From 3’6” to 10’6”

Standard Bay Window Height: From 3’ to 6’6” 

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 many windows, and for the right space it’s a worthy investment.

Standard Casement Window Sizes

casement windows

Standard Casement Window Width: From 1’2” to 2′ 11.5”

Standard Casement Window Height: From 1’5”  to 6’1”

Hinged windows that open from the side are known as 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.

Standard Awning Window Sizes

awning casement windowsStandard Awning Window Width: From 2′” to 5’5-7/8”

Standard Awning Window Height: From 1’8” to 3’6”

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.

Installing Standard Size Windows Quickly

When you are looking for custom window replacement contractors they have to be created or shipped from a specialized location. On the other hand, standard windows are already produced and sitting in warehouses and on shelves around the country. That’s why if you need to have your windows installed as quickly as possible—say you have a broken window that needs immediate replacement—standard windows are the way to go.

A contractor measures out the space for a skylight

Ordering Custom Window Sizes

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 type of windows you need, as well as what frame material and glass you want. 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 location or go and pick them up. You’ll be responsible for finding the professionals to install them for you unless it was included in your purchase agreement

  • Generally when you are purchasing windows for your home you’ll be looking at standard windows, especially when you are just getting standard replacement windows. Standard sizes are very common in new construction or homes built within the last 30 years.

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 offer you more feature options, so they’re tailored specifically for your home.

Standard Window Sizes – Charts

 – Standard Double Hung Window Size Chart:

standard double hung window measurements

 – Standard Picture Window Size Chart:

standard picture window measurements

 – Standard Sliding Window Size Chart:

sliding window standard measurements






Here are some other helpful pages to help you through your replacement window project.

Best Window Brands 

Cost for Window Replacement

Measuring Replacement Windows 

Types of Window Frames

When to Replace Windows 

Window Glass Repairs 

Window Rebates & Incentives 

Window Replacement Information

Window Replacement Contractors Near Me

Let us help you decide what type of replacement window you should choose for your window installation project below: 


Compare All Types of Windows 

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