Standard Door Sizes: The Complete Guide

There are many different standard door sizes available in the UK and understanding the measurements can often become quite confusing.  JB Kind Doors offer a core selection of the most common door sizes from stock and if you have a non-standard size requirement, bespoke internal doors can be ordered for many of our doors.

Quick answer: The most common UK internal door size is 1981 x 762mm (6’6″ x 2’6″) in England and Wales. In Scotland, the metric equivalent 2040 x 726mm is most widely used.

Standard UK Door Sizes

Standard UK internal doors follow imperial measurements based on traditional British sizing. These are the most widely stocked sizes and the ones you’re most likely to encounter in homes built before the 1990s.

• 1981 x 457/533 x 35mm – door sizes tend to be most popular for use as cupboard or wardrobe doors.
• 1981 x 610/686 x 35mm – door sizes are used where the wall space may be restricted and a smaller door is required.
• 1981 x 762 x 35mm – often referred to as a 2’6” door is the most common internal door size in England and Wales.
• 1981 x 838 x 35mm – in most circumstances provides the required opening width for wheelchair access under the Part ‘M’ mobility requirements.  You may also hear this door size being referred to as a 2’9”.

If your opening doesn’t match a standard size, bespoke internal doors can be ordered to your exact measurements.

View our internal doors

Standard Door Width

Standard door width in England and Wales is 762mm (2’6″). This is the single most common width across UK housing stock.

Other standard widths include 686mm, 610mm, 838mm, and 915mm – each suited to different room types and accessibility requirements. The 838mm width (2’9″) is particularly important for wheelchair access compliance under Part M of the Building Regulations.

When measuring for a replacement door, always measure the width of the frame opening at the top, middle, and bottom. Take the widest measurement – frames are rarely perfectly square.

Standard Door Height

Standard door height in England and Wales is 1981mm (6’6″). This applies to the vast majority of homes built to UK standard dimensions.

Older properties – particularly Victorian and Edwardian homes – may have non-standard heights. Always measure your existing frame rather than assuming a standard size applies. In Scotland and newer builds following European standards, the metric height of 2040mm is increasingly common.

Metric Standard Door Sizes

Metric doors are standard in Scotland and increasingly common in new-build properties across the UK. They differ from imperial sizes in two key ways: a taller door height of 2040mm and an increased thickness of 40mm.

• 2040 x 526mm x 40mm
• 2040 x 626mm x 40mm
• 2040 x 726mm x 40mm – most common in Scotland
• 2040 x 826mm x 40mm
• 2040 x 926mm x 40mm

Fire Door Standard Sizes

All standard UK and metric door sizes are available as fire door equivalents. The only dimensional difference is an increased thickness of 45mm – necessary to accommodate the extra core materials required to achieve the fire rating. When fitting a fire door, remember to check that your frames, intumescent seals and ironmongery all comply with the door’s fire certification. A fire door is only as effective as the installation around it.

 See our Fire Door Fitting page for more information.

Find out more about our fire doors

Door Size Conversion Chart

Use this chart to convert between metric (mm) and imperial measurements. If you know your door size in feet and inches, find the metric equivalent in the left column.

Door Size FAQs

What is the standard height of a UK internal door?

The standard internal door height in England and Wales is 1981mm (6’6″). In Scotland and newer properties, the metric equivalent of 2040mm is most commonly used. If you’re replacing a door in an older property, always measure the actual frame opening – particularly in Victorian or period homes where openings vary significantly.

What is the standard width of a UK internal door?

The average width of an internal door within England and Wales us 762mm (2’6”). In Scotland, the metric equivalent of 726mm is most commonly used. For doorways that need to accommodate wheelchairs, the recommended minimum width is 838mm (2’9″) to meet Part M of the Building Regulations.

How do I measure for a replacement internal door?

Measure inside the door frame across the width at the top, middle and bottom, taking the widest measurement. Do the same for height, measuring up the vertical sides of the frame and taking the longest measurement. These are your opening dimensions – your door leaf will be cut slightly smaller (typically 2–3mm each side) for fitting clearance.

For more details, see How to measure for a new door

What is the difference between imperial and metric door sizes?

Imperial door sizes use 1981mm height and 35mm thickness. Metric door sizes use a taller 2040mm height and a thicker 40mm door leaf. Fire door equivalents of both types use a 45mm thickness. Metric widths increase in 100mm increments (526, 626, 726, 826, 926mm); imperial widths increment in larger, less uniform steps.

How do I measure for a double door?

Start by measuring the opening size and divide the width by two to give an approximate width for each door.  If the frame is not already fitted, you need to allow for this (most common frame width is 30mm both sides), as well as some tolerance for fitting (approximately 2-3mm each side).

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

Compare the Single door width with the sizes available in your chosen design to determine whether a standard option will work or if you require bespoke made to measure doors.

When fitting double doors, you also need to consider how you would like the doors to meet in the middle. E.g. square or rebated meeting stiles. See How to Create a Door Pair for more information.

Fitting double doors is not straight forward and we would always advise using a professional Joiner to help you achieve the perfect fit.

What are standard door dimensions in mm?

The most common standard door dimensions in the UK (in mm) are:

• 1981 x 762 x 35mm – most common imperial size (England & Wales)
• 2040 x 726 x 40mm – most common metric size (Scotland/new builds)
• 1981 x 838 x 35mm – wheelchair accessible width
• 1981 x 762 x 45mm – fire door equivalent of the most common size

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