How to Measure Doors for Replacement

Swapping out an ailing set of doors for a sparkling new one is a great way to refresh an interior. With that said, if you’re going to make such an upgrade, you’ll need to be absolutely sure that your replacement door(s) are going to match up with the existing aperture. That’s where your trusty measuring tape comes in handy – with its help, you’ll be able to double-check that you have a match before you spend time (and money) sending back a door that doesn’t quite match up with your needs.

What Size Door Do I Need?

Fortunately for us, most doors come in pre-arranged sizes, making it difficult to make a mistake unless you’re replacing a door that’s custom-made. In England and Wales, the most common internal door size is 1981×762, and thus you’ll find that most double and bi-folding door sets fall into multiples of 762mm (or 2’6’’) wide. Exceptions occur most often when space is limited, or when wheelchair access is needed (or was needed in the past).

We’re missing out on one crucial dimension, here, and that’s depth. So, what is the thickness of an internal door? Generally speaking, doors tend to be 35mm wide. Again, it depends on where the door is! You might find that your kitchen doors are slightly thicker and heavier than the others in your property, as they’re often built to contain fires.

How to Measure and Order Doors

How are doors measured? We’re going to run through the process, step-by-step. Before we get started, however, let’s emphasise that you shouldn’t simply measure the existing door. Frames tend to deform over time, as the timber absorbs moisture unevenly, which in turn causes warping. As such, you’ll want to measure the aperture.

You’ll need just one tool to do your measuring, and that’s a tape measure. Let’s take a look at how to measure up for a new door!

  1. Start by measuring the width of your door. Take three measurements – one at the top, one at the middle, and one at the bottom. The narrowest of these measurements should indicate how wide your door should be. Remember that you’re going to be leaving a little bit of clearance. If there’s a significant discrepancy between the three distances, then you’ll need to adjust the frame.
  2. Next, we’re going to repeat the procedure in order to figure out the door’s height. You’ll be measuring the height of the door at the left, right and centre. Again, any significant discrepancy will indicate a door whose frame needs to be adjusted.

Should you find your door frame to be significantly outside of standard dimensions, then you’ll need to order a custom door, which will add significantly to your costs. With that said, you can easily plane down the edges of your solid-wood door to get it to the required proportions – just be sure that you’re within a few millimetres before getting started.