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How to measure a door for replacement?

how to measure a door

Is there a proper way to measure a door the right way?

If you are looking to replace your internal doors, it is important to know how to measure them so new doors can be ordered correctly. As openings are not always perfectly plumb and square, a door is fitted to the frame. If you know how to use a tape measure, you can calculate your door accurately. The only tricky part is knowing where to take the measurements.

Measurement guidelines

  • DO NOT measure the existing door. You must always measure your frame and base your measurements on the frame only. This is because the existing door could have been fitted poorly and may not be a true reflection of the size required. 
  • Door height- Measure the inside of each vertical side of the existing frame. The longest length determines the height required. Remember to take the existing floor covering into account too.
  • Door width- Take 3 measurements inside the door frame, at the top, middle and bottom of the door. The widest measurement determines the width of the door.
  • Door thickness. There are 3 standard thicknesses for internal doors- 35mm most common, 40 and 44mm. Measure the frame rebate where the door will sit when closed.

Ready to go shopping?

Once you have your door measurements, you are ready to take that information and start shopping for a new door. Before ordering or purchasing your new door, its still a good idea to have a professional measure the door so there are no issues on installation day. This will give you more insight and should you wish to make significant changes (changing sliding doors to French doors for example) then they will be able to provide you with more information and confirm any hidden issues or sizing requirements.

We invite you to browse our website for more advice and inspiration. Enjoy!

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