UK standard door sizes and conversion chart

Help & Advice > Product Guides > Internal Doors

At Door Superstore, our customers often ask us:

What is the standard UK door size?

The short answer is that there is no single standard door size since doors in the UK don’t have to be a specific size.

Having said that, we should point out that there are a few commonly found options that are typically described as ‘standard door sizes’.

In a nutshell:

The standard door height for an internal door in England and Wales is 1981mm, while the standard door width is 762mm. This is also known as a 2’ by 6’ door. In Scotland, most internal doors are a bit higher at 2040mm and a bit narrower at 726mm.

But wait – that’s just the beginning! As a matter of fact, there are plenty of other standard door size options readily available on the market.

To help you get a clearer idea of the various door sizes in the UK and the units of measurement, we’ve prepared a handy conversion chart.

Table of contents:

• Understanding interior door sizes and door dimensions
• Standard door sizes in the UK
• Non-standard UK door sizes
• Final thoughts

Understanding interior door sizes and door dimensions

If you’re unsure what door size you need, take the time to measure up using our simple guide. The main dimensions you’re going to need are door width and door height.

Now:

Internal doors have to meet minimum width requirements due to Building Regulations. Approved Document M Volume 1: Access to and use of buildings (2015 edition incorporating 2016 amendments – for use in England) stipulates the minimum standard door width of internal doors in newly built visitable dwellings to provide sufficient disabled access.

Here’s the scoop:

To satisfy the requirement, the minimum doorway clear opening width should be 750mm when approached head-on from a corridor clear passageway that is 900mm wide. There are slightly different requirements depending on the width of the corridor and whether or not the approach is head-on, with 800mm being the largest minimum width.

Keep in mind that fire doors are subject to a separate set of regulations, the biggest variable being thickness. Whereas most standard internal doors are 35mm thick, fire doors are typically either 44mm thick or 54mm thick, depending on their fire rating. To find out more about fire door sizes, check out our dedicated guide.

Building Regulations aside, there’s nothing to dictate that all doors must be ‘x’ size. This can lead to some difficulty in finding a door that will fit, especially when you throw metric and imperial measurements into the mix.

The thing is:

The industry hasn’t widely decided which measurement is king yet. So, the metric to imperial door size conversion charts below should help you understand the standard door size in the UK.

Standard door sizes in the UK

The ‘non-standard UK door sizes’ below are available but less commonly wanted door sizes in the UK.

Still, these door dimensions are readily available in popular ranges of doors. If your door isn’t on this list, it’s worth giving us a call to see what we can do, even if that means we recommend bespoke internal door sizes to suit your needs best.

Non-standard UK door sizes

The ‘non-standard UK door sizes’ below are available but less commonly wanted door sizes in the UK. These door dimensions are readily available in popular ranges of doors. If your door isn’t on this list it’s worth giving us a call to see what we can do, even if that means we recommend custom doors to suit you best.

Final thoughts

Standard door sizes in the UK can be a bit confusing due to the different options and units of measurement used within the industry.

Hopefully, our conversion charts have given you a clearer idea of what you’re likely to come across in terms of door widths and door heights in both metric and imperial units.

Key takeaway:

The fact that there isn’t a single standard door size set in stone actually makes it easier to choose an internal or external door that suits your décor, budget and overall preferences best.