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How to Measure Storm Window – A Comprehensive Guide

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Are you thinking of replacing your window with a storm window? With similar energy savings and at one-third of the cost of complete window replacement, you can have a storm window for your home. 

Storm windows are not just a protective measure for your home. It also helps keep your home cool in the summer and warm in the winter. For this reason, knowing how to measure storm windows is essential to find the right window size for your home.

Storm windows are often used in regions that experience winter storms or high winds. They are also used for additional insulation and to reduce noise pollution because they help to block out heat and exterior noise with their thicker glass.

This article will discuss what you’ll need to measure a storm window to purchase the correct size.

How to measure storm windows?

Installing storm windows seems straightforward. Still, three steps in the procedure can easily trip up any contractor or homeowner, so it’s preferable to let the experts assist with this task. 

Taking the proper measurement to determine a window’s opening dimensions and understanding what sort of storm installation is suitable for your windows are these issues.

Step 1 – Measure The Width

Measure the width of your window three times – at the top, in the centre, and at the bottom on the inside. You should note down The smallest of the three measures. Next, measure the opening’s interior height from top to bottom on the left and right sides. 

Remember to record the smaller of the two measurements once again. 

Step 2 – Subtract The Width

Take the width measurement and subtract 1/8 of an inch from it if you want to install your storm window with the inside mount approach. You will order that unit tip to tip by writing your width and height on paper.

Step 3 – Balance The Width & Height

Take the width and height measures and increase them by one inch for the breadth and by 3/4 inch for the height for an outside mount installation. You should order your window in this manner, so make a note of those measurements.

What are the benefits of having a storm window?

A storm window is a type of window installed in areas with strong winds, and it can be installed on any window.

It is an affordable way to protect your home from the elements. They can be installed on any window and offer a great return on investment.

The simplest solution to reducing air leakage from your house without undergoing a replacement installation process is installing new storm windows or doors.

Investing in a storm window that can withstand storms and other natural disasters may be worth considering. Doing this will help you protect your family and your property from these destructive forces of nature.

Types of Storm Windows

Storm windows can be installed in any window, but it’s usually done for those with an opening at least 18 inches wide. This will allow for more natural light and ventilation in your home during cold weather.

When the time comes to choose, there are several different storm window types to consider. Storm windows may generally be categorised by various things:

1. Exterior Storm Window

The frames for exterior storm windows can be made of wood, metal, or vinyl and come in various layouts, standard window sizes, and materials. 

Aluminium storm windows are durable, light, and almost maintenance-free. Still, sometimes they may perform poorly as insulators because they heat up rapidly, according to Energy Saver, a consumer resource from the U.S. Department of Energy.

2. Interior Storm Window

Interior storm windows are lightweight plastic, acrylic, or glass inserts that are affordable, easy to install, and customised for different window sizes and shapes. A few are basic panels, while others are vinyl or fibreglass-framed pieces. 

Interior storm windows are installed to fit inside interior window frames, and their tight seal improves their insulating and sound-reduction properties. Because of their simplicity of installation, interior storm windows are ideal for multi-story houses and residences.

3. Temporary Storm Window

The use of temporary and disposable storm windows is most prevalent in the winter. Single acrylic panels designed to fit within windowpanes are available in disposable versions. 

Insulating films that connect to a window’s inner face using adhesive tape and are shrunk with a hair dryer to produce a snug fit can be used to make temporary storm windows.

Once you determine the type of storm window you would like to install, Next, choose the kind of sills that currently exist in your windows. All height measures must be taken from the highest point of the sill to the head if your sill is standard. Make careful to measure to the bottom of the drop sill while taking measurements.


Installing storm windows or purchasing your home with storms in mind may be an investment worth considering.

The last few years have seen a drastic increase in natural disasters. In many cases, the damage is so severe that rebuilding is impossible. This has led many people to consider building or purchasing their homes with storms in mind.

Measurements for storm windows vary depending on the window style and location in your home. For example, suppose you have a bay window, which is typically more comprehensive than other windows. In that case, you will need to measure both vertical and horizontal dimensions to determine the correct size.

Please consult your local hardware store or contractor for more information on measuring a storm window. Or You will get the measurement videos and more detailed guidance at DOE’s Building America Solution Center


1. What is the standard size of a storm window?

There are standard and customised sizes available for storm windows that can fit in types of windows. Generally, the most common storm windows size is between 3 to 6.5 feet high and 3.5 to 10.5 feet wide.

2. Can you replace the storm windows?

Yes, every storm window should be replaced in 2-3 years and cleaned after the stormy season.

3. Is it worth it to replace storm windows?

Storm windows are used for soundproofing, additional insulation that helps reduce energy costs and protect your existing windows from the stormy wind.

4. How do you replace old storm windows?

To replace the old storm window, you need to uninstall the storm window carefully and take measurements. Now you can upgrade your storm window with this same measure.

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