How To Measure Garage Door

When it comes to replacing or installing a new garage door, accurate measurements are crucial. A properly measured garage door ensures a perfect fit, enhances security, and improves the overall appearance of your home. However, measuring a garage door can be a daunting task, especially for those who have never done it before. In this guide, we will provide you with step-by-step instructions on how to measure your garage door accurately. So, let’s get started!

Why is Measuring Your Garage Door Important?

Before we dive into the measuring process, let’s understand the importance of accurate measurements for your garage door. Here are a few reasons why measuring your garage door is crucial:

1. Perfect Fit:

Proper measurements ensure that your new garage door fits perfectly into the available space. A well-fitting garage door not only enhances the aesthetics but also prevents any gaps that may compromise security and energy efficiency.

2. Safety:

An accurately measured garage door reduces the risk of accidents and injuries. If a garage door is too small or too large, it may not function properly, leading to potential safety hazards for you and your family.

3. Cost-Effective:

By measuring your garage door accurately, you prevent the need for rework or modifications, saving both time and money. Ordering the right size of the garage door initially eliminates the need for returns or expensive alterations later.

4. Easy Installation:

When you provide precise measurements to the garage door installer or manufacturer, the installation process becomes smoother and more efficient. This saves you from unnecessary delays and hassles.

Now that you understand the importance of measuring your garage door, let’s move on to the step-by-step process.

Step 1: Gather the Necessary Tools

Before you begin measuring your garage door, make sure you have the following tools handy:

– Tape measure:

A sturdy tape measure is essential for accurate measurements. Make sure it is long enough to measure the width and height of your garage door.

– Stepladder or stool:

You may need a stepladder or stool to reach the upper parts of the garage door, especially if it is a sectional or overhead door.

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– Pen and paper:

To record the measurements and avoid confusion, have a pen and paper ready to jot down the dimensions.

Step 2: Measure the Width

The width of your garage door is an important measurement that determines the size of the opening. Follow these steps to measure the width accurately:

1. Clear the Area:

Remove any objects or obstacles that may hinder your measurements. Make sure the garage door opening is completely clear.

2. Measure the Opening:

Start by measuring the width of the opening from one side to the other. Place the end of the tape measure against the inside edge of one of the vertical tracks and extend it horizontally to the opposite edge of the track on the other side. Note down the measurement in inches.

3. Take Multiple Measurements:

To ensure accuracy, take multiple measurements of the width at different points along the height of the opening. This helps identify any variations, as garage openings are not always perfectly square.

Step 3: Measure the Height

After measuring the width, it’s time to measure the height of your garage door opening. Here’s how you can do it:

1. Position the Tape Measure:

Stand on the stepladder or stool and position the tape measure vertically along the inside face of one of the vertical tracks. Extend the tape measure to the floor and note down the measurement in inches.

2. Take Multiple Measurements:

Similar to measuring the width, it’s important to take multiple measurements of the height at different points along the width of the opening. This helps identify any variations and ensures accuracy.

Step 4: Measure the Headroom and Sideroom

In addition to measuring the width and height, you need to determine the headroom and sideroom available for your garage door. The headroom is the distance between the top of the door opening and the ceiling, while the sideroom refers to the space on either side of the opening. Follow these steps to measure them:

1. Headroom Measurement:

To measure the headroom, start from the top of the door opening and extend the tape measure vertically to the ceiling. Ensure that the tape measure runs parallel to the door tracks. Note down the measurement in inches.

2. Sideroom Measurement:

The sideroom is measured on both sides of the opening. Position the tape measure horizontally against the side walls, starting from the inside face of the vertical tracks. Extend it to the nearest obstruction, such as a wall or column. Record the measurement in inches for each side.

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Step 5: Determine the Backroom

The backroom is the distance between the garage door opening and the rear wall of the garage. This measurement is essential, especially for sectional or overhead doors that require adequate space for tracks and movement. Follow these steps to determine the backroom:

1. Position the Tape Measure:

Stand inside the garage, facing the closed garage door. Place the end of the tape measure against the inside of the door opening and extend it horizontally to the rear wall. Note down the measurement in inches.

Step 6: Check for Uneven Floor or Ceiling

It’s important to note any unevenness in the floor or ceiling that may affect the installation of your garage door. Use a level or measuring tool to check for any slopes, bumps, or irregularities. If you notice any significant variations, it’s advisable to consult a professional for guidance or necessary adjustments.

FAQs (Frequently Asked Questions)

1. Can I install a garage door myself?

Installing a garage door requires specific skills and knowledge. While it is possible to install a garage door yourself, it’s recommended to hire a professional installer for accurate measurements, proper installation, and to ensure the door is balanced and functions correctly.

2. Do I need to measure the garage door for insulation?

Yes, accurate measurements are crucial when considering insulation for your garage door. Insulated doors require precise measurements to ensure a proper fit and optimum insulation performance.

3. What if my measurements are slightly off?

If your measurements are slightly off, it’s always best to consult with a professional. They can evaluate the measurements and suggest appropriate adjustments or modifications to ensure a perfect fit for your garage door.

4. Why should I hire a professional installer instead of doing it myself?

A professional installer has the experience and expertise to measure accurately and install the garage door correctly. They can handle any challenges that may arise during the installation process, ensuring a smooth and hassle-free experience.

5. Can I use my old garage door’s measurements for a new one?

Not necessarily. It’s essential to measure your new garage door, even if you are replacing an existing one. Changes in design, dimensions, or specific requirements may result in different measurements for your new door.


Accurate measurements are key when it comes to installing or replacing a garage door. Following the step-by-step instructions outlined in this guide will help you measure your garage door correctly. Remember to take multiple measurements and consult a professional if needed. By ensuring precise measurements, you can enjoy a perfectly fitted garage door that enhances both the aesthetics and functionality of your home.