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Door Sizes Guide

Door sizes

Door Sizes

In the UK there are a multitude of standard doors sizes and oftentimes knowing how to make sense of measurements can be hard-going and puzzling. At BSO we provide a core range of the most prolific door sizes from stock. On this page we explain the standard internal door height and standard internal door size door width.

Internal Standard Door Sizing UK

  • 1981 x 457/533 x 35mm – door sizing usually most popular for wardrobe or cupboard door use
  • 1981 x 610/686 x 35mm - door sizing used where there may be limited wall space and a small fitting door is needed.
  • 1981 x 762 x 35mm - often mentioned as a 2' 6" door is the most typical internal door sizing in England and Wales.
  • 1981 x 838 x 35mm - in most circumstances provides the necessary opening width for wheelchair access under the Part 'M' mobility specification. This door sizing is also known as a 2' 9".

Standard Metric Door Sizing

Internal metric sized doors are becoming progressively popular and are most prolifically used across much of Scotland and the continent. Sometimes odd size doors can be present in period properties.The main difference being a door height increase of 2040mm and door thickness of 40mm.

  • 2040 x 526/626/726/826/926 x 40mm

Standard Fire Door Sizing

All UK standard and metric door sizes are usually available as a comparable fire door the only additional feature being an increased door thickness of 45mm. To attain its fire rating, additional component materials are needed resulting in this 45mm thickness. Note that you will need to verify that your frames, ironmongery and intumescent seals also adhere to the doors fire certification.

Door Sizing Conversion Chart

Please find our useful door sizing conversion chart. If you are used to imperial measurements, the chart will help you with the metric equivalent door sizes. 


Metric (mm)

Imperial (inches)

Imperial (feet & inches)

1981 x 457

78″ x 18″

6′6″ x 1′6″

1981 x 533

78″ x 21″

6′6″ x 1′9″

1981 x 610

78″ x 24″

6′6″ x 2′0″

1981 x 686

78″ x 27″

6′6″ x 2′3″

1981 x 711

78″ x 28″

6′6″ x 2′4″

1981 x 762

78″ x 30″

6′6″ x 2′6″

1981 x 838

78″ x 33″

6′6″ x 2′9″

1981 x 915

78″ x 36″

6′6″ x 3′0″

1981 x 1067

78″ x 42″

6′6″ x 3′6″

1981 x 1168

78″ x 46″

6′6″ x 3′10″

1981 x 1220

78″ x 48″

6′6″ x 4′0″

1981 x 1372

78″ x 54″

6′6″ x 4′6″

1981 x 1524

78″ x 60″

6′6″ x 5′0″

2032 x 813

80″ x 32″

6′8″ x 2′8″

2134 x 915

84″ x 36″

7′0″ x 3′0″

2040 x 526

80 1⁄4″ x 20 11⁄16″

6′8 1⁄4″ x 1′8 11⁄16″

2040 x 626

80 1⁄4″ x 24 5⁄8″

6′8 1⁄4″ x 2′0 5⁄8″

2040 x 726

80 1⁄4″ x 28 5⁄8″

6′8 1⁄4″ x 2′4 5⁄8″

2040 x 826

80 1⁄4″ x 32 1⁄2″

6′8 1⁄4″ x 2′8 1⁄2″

2040 x 926

80 1⁄4″ x 36 7⁄16″

6′8 1⁄4″ x 3′0 7⁄16″

What's the standard door height of an internal door UK?

In England and Wales, the height of a standard door is 1981mm (6' 6").

Scotland typically uses a metric equivalent. The average door height in Scotland is slightly taller at 2040mm.

What's the standard door width of an internal door UK?

In England and Wales the average width of an internal door is 762mm (2' 6").

Scotland usually choose a metric equivalent that is a little smaller at 726mm.

How do I measure for a replacement internal door?

To measure for a replacement internal door you will need to take a measurement of the interior of the door frame, across the width, and then find the broadest measurement to decide the necessary door width.

To measure the height of the door, measure the interior of the vertical side of the frame and the longest length determines the necessary height.

How wide is a UK standard internal door frame?

The most typical door frame width in England & Wales is 762mm. In Scotland the most common door frame width is 726mm.

Door frames can be supplied pre-assembled or in component parts which can be cut to size, to fit all door sizes.

As the size of the frame you require will depend on the size of the opening, there is no standard UK door frame size. We would always suggest consulting with a professional joiner as door frame fitting is difficult and requires careful precision.

How do I measure for a double door?

To measure for a double door you will first need to measure the door opening size. Start by measuring the opening size and divide the width by two to give an approximate width for each door. If the frame isn't fitted, you will need to allow for this (usual frame width is 30mm either side), and tolerance for fitting (about 2-3mm each side).

Opening width - Frame width (e.g. 60mm) - Fitting adjustment (6mm) = Double door width / 2 = Single door width

When fitting double doors, you also need to take into account how you want the doors to come together in the middle.

Fitting double doors is not always plain sailing and we would always recommend using a knowledgeable joiner to help you get the perfect fit.

What is the average bedroom door sze?

The average bedroom door is similar to any internal door size. More often than not, you will find a bedroom door having a height of 1981mm or 6'6".