​A Guide to Barn Door Measurements

Posted by The Barn Door Hardware Store on May 3rd 2024

Barn doors offer more than their rustic aesthetic – they’re functional solutions for your door needs!

Whether you’re interested in exploring the new farmhouse chic look, or simply want to make your space easier to use, barn doors can be a great addition to your home.

These doors offer the perfect combination of privacy and comfortability, with their sliding mechanism and lived-in look.

If you’ve decided to install a barn door in your home, you’ll want to fully understand how to measure correctly.

So, in this guide, we’ll be showing you how to measure your barn door, from selecting the right tools to executing the measuring process.

It doesn’t matter if you’re a seasoned contractor or a DIY home improvement hobbyist, barn door measurements can be a bit tricky without a roadmap to reference.

Let’s begin!

Gathering Your Tools

Getting the measurements of your barn door right is critical for an easy and quick installation process.

To begin, gather some essential tools: tape measure, level, pencil, and screwdriver.

Although these tools are quite basic, they will make your installation process more accurate in the long run.

Tape Measure

When measuring your barn door, you’ll need to determine its width and height relative to the space it will occupy.

For this task, the tape measure will guide you toward accuracy like no other tool. Tape measures are used for precisely measuring the dimensions of the space where your bard door will be installed.

There are many different kinds of tape measures, some of which can be found at this webpage.


Barn doors differ from traditional doors because they hang (and sometimes swing) in order to function.

Therefore, a level is very important for ensuring that your barn door hangs straight downward and does not sway.

Barn doors can swing open or close by accident, so having a level door will give you more control over how it's used.


Next, pencils allow you to mark your measurements as you go without doing permanent damage to the surrounding walls.

With that said, still maintain light pressure with the pencil to remove the marks after you’re finished with the measuring and installation process.

If your measurements are easily visible as you’re picking out and installing your barn door, the whole process will go a lot smoother.


The remaining essential tool is a screwdriver.

Screwdrivers are necessary for attaching hardware (brackets, rails, etc.) to your barn door. In the same vein, having a power drill may offer benefits that cannot be seen with a typical screwdriver.

You can customize how the drill functions by interchanging bits and modifying its speed.

Needless to say, some barn doors may be more involved than others, so it's always a good idea to have a screwdriver or drill on hand to fasten components to the door.

Laser Level

For more advanced barn door settings, you may want to consider using a laser level.

This tool emits a straight, level line of light across a surface, which can fine-tune your measurements to a greater extent.

Laser levels are more reliable than traditional bubble levels and can be useful when measuring a considerable length.

Step-by-Step Guide

Do you have all of your tools? Great! Now, we can move on to discussing the process of measuring for your barn door.

1. Measure the opening

To begin the measuring process, measure the height and width of the opening where you want to install the barn door.

For this measurement (and each going forward), be sure to specify if you’re measuring in inches or centimeters.

Depending on where you live, one measurement type may be easier to use than another, especially if you need to present these measurements to a hardware store or contractor.

2. Choose the hardware

Now it’s time to choose hardware for your barn door.

Typically, with barn doors, the types of hardware that are chosen are track systems, roller hangers, handles, floor guides, and stoppers.

You can install further modifications with soft-close hardware mechanisms, but those five hardware types are the most important and will be easier to find at your local hardware store or national brand.

Also, before installing any hardware (or even choosing it), measure the length of the track to ensure that it fits your opening.

A track that is too short will leave a gap between the door and the wall, and a track that is too long won’t fit in the space you’ve designated for the barn door.

3. Determine the door size

Determining door size is pretty straightforward, but there are some rule-of-thumb actions to take when measuring.

First, add 2-4 inches to the width of the opening to determine the width of the barn door.

Next, add 1 inch of height to the opening that you’ve chosen for your barn door to determine the height of the barn door.

In essence, your barn door cannot be the exact size of the opening, or it won’t fit right.

4. Check for obstructions

If you have all of your measurements, hardware, and door ready, be sure to check for any obstructions that may interfere with the installation of the barn door.

This can include other pieces of furniture, other doors, and more. Also, make sure that there is enough space for the door to slide open and closed.


You’ve reached the end of this guide to barn door measurements – nice work!

Hopefully, you feel more empowered to tackle your barn door project now that you have a framework to follow.

If you have remaining questions, it is advisable to consult a technician or contractor that has a lot of experience with barn doors.

Installing your barn door right the first time avoids needing to replace parts or the entire contraption down the line. Wishing you the best of luck on your upcoming barn door endeavor!