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How to Measure a Door

By August 17, 2023Home Maintenance
Double doors on a house that might need replacing.

Replacing a door in your home can be an exciting project that freshens up the appearance and functionality of your space. However, before you rush into purchasing a new door, it’s essential to know how to measure it correctly. Wondering how to measure a door? There are a few steps you need to take depending on the type of door you are replacing or installing.

Let’s take a look.

Tools That You Will Need

In order to do this project, there are a few tools that you will need.

However, if you have an iPhone, you can download the Measure app if you don’t have a measuring tape. This app can detect a rectangle measurement and also you can take a manual measurement. Take a look at this link on the Apple website for more information.

Replacing the Door

If you are only replacing the door itself, follow these steps to ensure a proper fit:

  1. Start by measuring the width of the frame where the door is installed. Use a tape measure to measure the distance from one side of the frame to the other at the widest point.
  2. Next, measure the height of the door frame from the top to the bottom along the side where the hinges are located.
  3. Take note of any additional measurements required, such as the thickness of the door or the location of the handle.

Replacing the Door System

When replacing the entire door system, including the frame and hardware, you need to consider some additional measurements:

  1. Measure the rough opening of the doorway, which includes the width, height, and depth of the space where the door system will be installed.
  2. Ensure that the rough opening is plumb, square, and level to avoid any installation issues.
  3. Note down any specific requirements or preferences you have regarding the door style, material, or hardware options.
Door with sidelights.

Front Door With Sidelights

Sidelights are popular additions to front doors that bring more natural light into your entryway. Here’s how to measure for a front door with sidelights:

  1. Measure the width and height of the door frame, just as you would for a regular door replacement.
  2. Determine the width of the sidelights by measuring the space from the edge of the doorframe to the start of the sidelights.
  3. Measure the height of the sidelights, starting from the bottom of the doorframe to the top of the sidelights.
Double doors on a house.

Double Doors

Double doors can add elegance to your home’s entrance, but accurate measurements are crucial for a proper fit. Follow these steps:

  1. Measure the width of each door frame individually, taking note of any variations between the two.
  2. Measure the height of each door frame separately, as they might differ due to factors like flooring or settling.
  3. Consider the necessary clearance space between the two doors for smooth operation.

Double Doors With Sidelights

If you’re considering double doors with sidelights, follow these combined measurements:

  1. Measure the width and height of each door frame, just as you would for individual double doors.
  2. Determine the width of the sidelights by measuring from the edge of one doorframe to the start of the sidelights, then repeat for the other side.
  3. Measure the height of the sidelights, starting from the bottom of the doorframe to the top of the sidelights.

Front Door Replacement Options

When replacing your front door, consider various options to enhance your home’s curb appeal and security. Additionally, you can choose from a wide range of materials, styles, finishes, and hardware options. From traditional wooden doors to sleek and modern fiberglass options, there is a perfect door for every homeowner’s taste and budget.

Other Recommended Maintenance

Now that you know how to measure for a door, let’s take a look at a few other areas for maintenance. One of those is the pros and cons of hollow core doors. These are often seen inside a home as they are usually made of laminate and not very sturdy. However, they give you privacy for a low price and there are various styles to choose from.

Another area is replacing interior doors. Choosing interior doors that are more modern and stylish can add value to your home. Also, this is an easy way to give your home a new look as well.

Lastly, if you find you have a warped door, you can fix it or replace it. This involves removing the door, cutting it, removing the warped areas, or using weights to flatten the door out.

When Do I Call a Professional?

While measuring a door can be a straightforward task for many homeowners, some situations may require professional assistance. If you’re unsure about any aspect of the measurement process or lack the necessary tools.

Also, when dealing with complex door systems, such as custom-made or non-standard sizes you may need a professional. Lastly, if you’re considering structural changes that may affect the door installation, such as widening or raising the doorway.


Properly measuring a door is essential for a successful replacement project. By following the steps out you’ll be well-equipped to measure a door when replacing just the door, replacing the entire system, or adding sidelights or double doors.

Remember that accuracy is key to ensuring a perfect fit and achieving the desired look for your home. While you are doing this, it might be a good time for a home inspection. Reach out to Atkinson Inspection Services for an inspection of your doors in the Orlando, Clermont, and Villages areas and a full home inspection.