how to measure doorway width

How to Measure Doorway Width: A Step-by-Step Guide

By Christopher MooreJanuary 2, 2026

Measuring doorway width is a crucial step in ensuring a smooth and safe passage through any given space. Whether you're installing a new door, hanging artwork, or simply want to ensure your current doorway meets standard measurements, this guide will walk you through the process in a simple, step-by-step manner.

Before we dive into the specifics, let's briefly discuss why measuring doorway width is important. Doorways that are too narrow can cause inconvenience, while those that are too wide can compromise the structural integrity of your walls. Moreover, standard doorway widths are often required when selling or renting properties, as they ensure accessibility and safety for all inhabitants.

Understanding Doorway Width

Doorway width typically refers to the distance between the two sides of the door frame, excluding the thickness of the door itself. Standard doorway widths vary depending on your location and the type of door, but they generally fall within a range of 24 to 36 inches.

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For instance, in the United States, the International Residential Code (IRC) recommends a minimum clear width of 32 inches for interior doors and 36 inches for exterior doors. However, these measurements can vary, so it's always a good idea to check local building codes or consult with a professional.

Measuring Existing Doorways

If you're measuring an existing doorway, the process is straightforward. You'll need a measuring tape, a pencil, and a notepad. Start by locating the two sides of the door frame. These are usually the vertical pieces of wood or metal that enclose the doorway.

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Using your measuring tape, measure the distance between these two sides. Make sure to measure from the inner edge of one side to the inner edge of the other. This will give you the clear width of the doorway, excluding the thickness of the door itself.

Measuring for New Doorways

If you're measuring for a new doorway, the process is slightly different. You'll need to decide where you want the doorway to be, then measure the width of the space you want the doorway to occupy. Again, make sure to measure from the inner edges of where the door frame will be installed.

It's also important to consider the thickness of the door you plan to install. For example, a standard interior door is typically around 1.375 inches thick, while an exterior door can be up to 1.75 inches thick. You'll need to subtract this thickness from your measurement to ensure a proper fit.

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Common Doorway Widths

As mentioned earlier, standard doorway widths can vary. However, some of the most common doorway widths include:

24 inches: This is a common width for closets and small rooms.
28 inches: This width is often used for interior doors leading to bedrooms, bathrooms, and other living spaces.
30 inches: This is a common width for exterior doors, as it allows for easy passage with large items like furniture or appliances.
32 inches: This is the minimum clear width recommended by the IRC for interior doors, providing ample space for most users.
36 inches: This is the minimum clear width recommended by the IRC for exterior doors, ensuring accessibility for people with disabilities.

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Adjusting Doorway Width

If your doorway is too narrow, you may be able to widen it by removing a section of the wall. However, this process can be complex and may require professional help. It's important to ensure that the wall you're working with is not load-bearing, as removing a section of a load-bearing wall can compromise the structural integrity of your home.

If your doorway is too wide, you may be able to install a wider door or a door with a smaller clear width. However, this can also be complex, as it may require adjusting the door frame or the door itself.

In any case, it's always a good idea to consult with a professional if you're unsure about how to proceed. A professional can provide guidance based on your specific situation and local building codes.

Measuring doorway width may seem like a simple task, but it's one that can have a significant impact on the functionality and safety of your space. By understanding the process and taking the time to measure accurately, you can ensure that your doorways are safe, accessible, and perfectly suited to your needs.