How to Measure Sliding Glass Door

Do you need to replace your sliding glass door, or are you looking to purchase a new one? To ensure a proper fit, it is important to accurately measure the door before purchasing. Sliding glass doors can be a great addition to your home, but it’s important to ensure they are installed correctly. When it comes to home renovations, one of the most common tasks is to measure a sliding glass door.

This type of door can be large and cumbersome, making it difficult to install without proper measurements. If the door is too big or too small, it can throw off the entire look and function of the room. In this blog post, we will teach you how to measure sliding glass door so that you can easily complete your renovation project. Keep reading for more helpful tips!

How to Measure Sliding Glass Door

What is Sliding Glass Door?

Before we dive into how to measure a sliding glass door, let’s first define what it is. A sliding glass door is a type of door made up of one or more panels that slide along a track, allowing for easy access to the outside without taking up precious interior space.

They are often used as entryways to patios or decks but can also be used as an alternative to traditional doors in a room. Sliding glass doors come in various sizes and shapes, with some being quite large and others smaller in size.

Why Should You Measure Before Install Your Sliding Glass Door?

  • Accurate measurements ensure that the sliding glass door fits properly in its frame and operates smoothly.
  • Incorrect measurements can lead to costly mistakes, such as having to order a new door or hiring professionals for adjustments.
  • Measuring also allows you to purchase the necessary hardware and materials beforehand, saving time and potential future expenses.
  • Another important factor to consider is the clearance needed for the door to open and close without obstruction.

Tools and Materials You Will Need

  • Tape measure
  • Pencil or pen
  • Notepad
  • Ladder (Optional)

With these simple tools, you will be able to measure your sliding glass door like a pro!

10 Easy Steps on How to Measure Sliding Glass Door

Step 1: Determine the Number of Panels

The first step to measuring your sliding glass door is determining the number of panels. This will affect how you measure and what measurements you will need to take note of.

To do this, simply count the number of sections that make up the door. Each section slides along the track, so there should be a visible separation between them.

Count the Number of Sections

Step 2: Measure the Overall Width

When measuring the overall width, start from one end of the door frame and extend your tape measure all the way across to the other side. Write down this measurement in inches.

If your sliding glass door has multiple panels, repeat this step for each panel and add up all of the measurements to get the total width.

Step 3: Measure Overall Height

Next, measure the overall height of the door by starting at the top of the frame and extending your tape measure down to the bottom. Just like with width, if there are multiple panels, be sure to repeat this step for each panel and add up all of the measurements.

Step 4: Measure the Width Between Tracks

This measurement is important as it will determine the space available for the door to slide open and closed. To do this, start at one end of a track and extend your tape measure across to the other end. Write down this measurement in inches.

Repeat this step for any additional tracks on your sliding glass door.

Step 5: Measure the Opening Height

In order to properly install the door, you will need to know how much clearance is available for it to slide open.

Start at the top of the opening and extend your tape measure down until it reaches the bottom. This measurement should not include any obstructions such as flooring or baseboards.

Step 6: Measure the Opening Width

Like measuring the height, start at one end of the opening and extend your tape measure across to the other. Write down this measurement in inches.

Ensure that this measurement does not include any obstructions that may prevent the door from sliding smoothly.

Extend Your Tape Measure

Step 7: Measure Distance From Top To Bottom Track

This measurement is crucial for properly installing hardware on the door. Start at the top track and extend your tape measure down to the bottom track. Write down this measurement in inches. Repeat this step if needed.

Step 8: Measure Distance From Left to Right Track

Following the same method as above, start at the left track and measure the distance to the right track. Write down this measurement as well.

Step 9: Check for Squareness

To ensure that your door operates smoothly, it is important to check for squareness. To do this, measure the distance from the top left corner to the bottom right corner and compare it to the distance from the top right corner to the bottom left corner.

If these two measurements are not equal, adjustments may need to be made before installation.

Step 10: Double Check Your Measurements

Before ordering or purchasing materials, double check all of your measurements and make sure they are accurate. It is always better to err on the side of caution than regret any mistakes in the future.

And there you have it! You are now ready to measure your sliding glass door like a pro properly. Happy measuring!

Double Check All Of Your Measurements

5 Additional Tips and Tricks

  1. Measure the height and width of both panels separately.
  2. Be sure to measure from the inside edge of the frame to the inside edge of the opposite frame.
  3. Pay attention to any obstructions, such as handles or locks, that may affect your measurements.
  4. Consider any installation adjustments, such as allowing space for the door to slide or swing open.
  5. Consider the thickness of the glass when determining your final measurements. This may affect how the door fits in its frame, as well as the overall appearance and style of the door.

I hope these tips help make measuring your sliding glass door seamless! Happy measuring.

5 Precautions You Can Take While Measuring Sliding Glass Doors

  1. Make sure the sliding glass door is in the closed position before measuring.
  2. Use a metal tape measure, as it will provide the most accurate measurements.
  3. Double-check your measurements for accuracy.
  4. Write down all measurements in a notebook or on a smartphone so you have them on hand for reference.
  5. Take into account any hardware or handles that may add width to the door frame when considering your measurements for ordering a replacement sliding glass door.

Taking precautions while measuring your sliding glass door can ensure that you order the correct size and avoid any costly mistakes. Consult a professional if you have any concerns or doubts about the process.

Can You Replace Sliding Glass Doors Without Replacing the Frame?

It is possible to replace the glass panel in a sliding door without replacing the entire frame, but it is not recommended. The frame may be damaged or worn and not able to support the new glass panel properly. Consult with a professional for the best solution for your particular situation.

Remember to measure carefully and consult with experts when replacing any part of your sliding glass door. This will help ensure a successful installation and proper function of the door in the long run.

Measure Carefully and Consult With Experts

Where Should You Set a Sliding Glass Door?

When deciding the placement of a sliding glass door, consider factors such as natural sunlight, views, and accessibility. Ultimately, it is up to personal preference where the door is set, but taking these elements into account can create a more enjoyable space.

Additionally, be sure to keep any furniture or decor away from the path of the sliding door to prevent obstructions and potential damage. Properly placed and maintained sliding glass doors can enhance the overall atmosphere and functionality of a room or outdoor space.


There you have it, a few different ways how to measure sliding glass door. Just remember to factor in additional space for trim and hardware when measuring! And if you’re still having trouble after that, there’s no shame in asking for help from professionals.

All in all, measuring a sliding glass door is not as daunting of a task as one might think. By following the few simple steps laid out above, you can easily and accurately measure a sliding glass door in no time. And though it may seem like a lot of tedious work, taking the time to measure your doors correctly will save you both time and money in the long run.

So next time you need to install or replace a sliding glass door, put down the tape measure and give these steps a try! Thanks for reading!

Jennifer Branett
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