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How to Measure a Door

Tuesday October 22nd, 2019

How to Measure a Door

Doors are one of the most important  parts of your home if they’re installed correctly. A door of any style  can be a great focal piece in any room, and create the perfect  transitioning point from room to room or even from inside to outside.  But, if a door is installed incorrectly because you measured wrong, it  can quickly turn into a clunky, money-wasting eyesore, as improperly  installed doors are typically hard to open and difficult to close.
Make sure you avoid the problems of  getting the wrong size door for your next project and learn how to best  measure for all different types of doors. Here are a few tips and tricks  about how to get quick and accurate measurements for any type of door  you’re looking to install.

Tools You Need to Measure for a Door

Before you get started, you need to  make sure you have the tools needed to get the job done. The tools  you’re going to need to measure for a door are:
an installing cassette roller blinds on windows
  • An accurate measuring tape with a minimum length of at least 90 inches.  Most doors have an average height of 80 inches, but your door might be  slightly larger or shorter depending on the age and style of your home.  Whether you have a door you need to replace or just need to measure the  door space for a totally new type or style of door, having a long,  bendable measuring tape can be helpful.
  •  A hammer and pry bar. In some cases, you will need to remove decorative molding or other  objects to get the most accurate measurement for your door. Be cautious  when doing this and try to avoid causing damage, as you will hopefully  be able to reinstall the molding once your new door is installed.  Sometimes using a pry bar to remove the interior door trim is too much,  so you may try something a bit gentler like a putty knife. 
  • Paper. Always write down your  measurements. No matter how great your memory might be, it is always  safer to write down your measurements for easy access.

How to Measure for a Storm Door

Two little boy, wearing same clothes looking through big glass
A storm door is generally installed  in front of an existing exterior door and helps to protect the exterior  door from extreme weather while still allowing for ventilation.  Typically, a storm door has a glass panel as part of its design.
If you want to know how to measure  for a storm door, first measure the length of your existing door three  separate times. You’ll want to measure on the left edge, then in the  center, and again on the right edge.
While you don’t necessarily need all  three measurements, measuring three times helps to make sure that your  measurements are consistent and enables you to catch any potential  errors.
Follow this step by taking  measurements of the width. Again, try to take the measurements in three  different locations (top, middle, and bottom) to make sure your  measurements are accurate.
Each measurement should be the same.  If the measurements are not the same, take your time and try again. Keep  in mind that if your measuring tape is not perfectly straight, it can  throw off your measurements.

How to Measure for a Prehung Door

Installation of a lock on the entrance door hand s man with screwdriver installs door knob
With a prehung door, rather than  worrying about assembling the door hinges to the door and the frame  yourself, you purchase a door that has already been installed on a  frame. While these take away some of the guesswork when installing,  learning how to measure for a prehung door takes more than just a tape  measure.
The  first thing you need to do is get access to the structural frame of the  doorway that you are going to be using. For any unfinished areas, this  step can be skipped because you are able to directly access your frame.  If you have any interior door trim, you will have to strip it away. To  do this, a pry bar or putty knife can be used to gently remove the trim.
After  you are done removing the trim, remove any old insulation that is  covering the door frame. Once you are able to see the edge of the frame  surrounding the door, it is time to measure. Measure three times for  both lengths (left, center, and right) and width (top, middle, and  bottom).
When  you measure the length, keep into consideration any flooring with which  the frame is in contact. It’s not the best idea to rip up flooring just  to make sure that your frame is accurately measured. Instead, use your  putty knife to determine the length of the frame that is being covered  by flooring.

How to Measure for a Screen Door

Front screen door of a house in Wellfleet, MA
The biggest difference between a  screen door and a storm door is the material in the window openings in  the door. How to measure for a screen door is exactly the same as you  would measure for a storm door.
Measure  the screen door you are replacing or the exterior door you will be  covering with the new screen door. Take three measurements lengthwise  and then three measurements widthwise. Write these numbers down and make  sure that they are consistent.
If  your door measurements are consistent and do not match a standard size,  you might need to consider having a custom door made. While these can  be slightly more expensive, it is better to get a door that fits your  home than to have one that does not fit.

How to Measure for a Sliding Barn Door

Sliding barn door bedroom with white interior
A sliding barn door can work with a variety of styles and forms depending on which type of door and hardware you choose to use. No matter the door style that you’re planning on using, measuring for your door is the same.
Learning how to measure a sliding barn door is a bit more complicated in some ways than other doors. Because the  barn door does not have to fit inside the threshold like a traditional  door, the measurements of a barn door are directly influenced by your  personal style and the style of the room.
At a minimum, a sliding barn door  should cover the door opening with a little bit of overlap, so it is  important to measure the door space to see how large the door needs to  be in order to cover the opening. It can always be larger depending on  the style you choose to go with for the room.
For a door opening that has no trim,  measure the width of the door opening from the inside of the finished  doorjamb three times for both the length (left, center, and right) and  width (top, middle, and bottom). Then, add to those dimensions the  amount of overlap you want for privacy or style.
For a door opening that has trim,  measure from the inside of the finished doorjamb for both the length and  width. Once you are finished with that, measure the width of the trim.  Add the trim twice to the width, and once to the height of the overall  size. This will take into account the trim on the left, right, and top  of the door. In addition, add to those combined dimensions of both the  door size and trim size, any additional inches of overlap that you want  for privacy.
If you do choose to go with a sliding  barn door, Artisan Hardware can help you with selecting your door style  and mounting hardware. Contact Artisan Hardware today for help with  your new sliding barn down and we’ll figure out what options will work  best for you! 
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