If you’re in the market for new external or internal doors, one of the most important things to ensure is that they’ll fit perfectly. Expert installation by professionals is obviously a big part of that, but before you get there, you need to understand standard UK door sizes and which options will suit you.
Are All Doors the Same Size in the UK?
There is no one standardised size for doors in the UK. Both internal and external doors differ in their dimensions in various ways and for myriad reasons.
At the most obvious level, you can get either single or double doors which are clearly very different in size. However, what you might consider standard single doors still don’t have a set height, width, or thickness.
So, let’s take a look at some of the most common door sizes for internal and external doors in the UK.
What Are Standard Internal Door Sizes in the UK?
In England and Wales, internal doors, whether they’re for rooms, cupboards, or other uses, are typically 1981mm or 6’6” in height. The same types of doors in Scotland, meanwhile, are usually a little taller at 2040mm or 6’8”.
The thickness of internal doors is also fairly standard. In general, English and Welsh internal doors measure 35mm thick and Scottish alternatives are 40mm. The exception, however, is internal fire doors. Their thickness depends on their fire protection rating, which is how long they can last in a fire. FD30 fire doors are generally 44mm thick and FD60 doors are typically 54mm thick.
It’s the width of internal doors in the UK where there’s the widest range of different sizes. That range of available widths generally begins at 457mm (18”) and extends all the way up to 838mm (33”).
The varying widths correspond with the most common uses of each door:
- Wardrobe or cupboard doors – Typically 1981mm tall, 457mm or 533mm wide, and 35mm thick.
- Room doors where space is restricted – 1981mm tall, 610mm or 686mm wide, and 35mm thick.
- Standard room doors – 1981mm tall, 762mm wide, and 35mm thick.
- Doors for wheelchair access – 1981mm tall, 838mm wide, and 35mm thick.
What Are Standard External Door Sizes in the UK?
The situation is slightly different when it comes to external doors. In this case, considerations like security and weather resistance require differing sizes of doors to be available.
Heights of standard UK external doors are often the same as internal ones, standing at 1981mm in England and Wales, and 2040mm in Scotland. External doors, however, tend to be thicker, with the most common thickness being 44mm. External fire doors, though, will often be thicker still.
Older front doors in the UK typically measure 762mm in width. Today, however, a width of 838mm is more common in order to improve the accessibility of properties to those with disabilities.
Standard UK Door Sizes Metric to Imperial Conversion Chart
As you’ve probably noticed, the standard sizes of doors in the UK are often measured in a mixture of metric and imperial units. To make things simpler for you, the following table lists some of the most common UK door sizes in both metric and imperial:
| Type of Door | Metric Measurements (H x W x D) | Imperial Measurements (H x W x D) |
|---|---|---|
| Wardrobe or cupboard door (England & Wales) | 1981mm x 457mm or 533mm x 35mm | 6’6” x 1’6” or 1’9” x 1.375” |
| Wardrobe or cupboard door (Scotland) | 2040mm x 457mm or 533mm x 40mm | 6’8” x 1’6” or 1’9” x 1.575” |
| Room door with limited space (England & Wales) | 1981mm x 610mm or 686mm x 35mm | 6’6” x 2’ or 2’3” x 1.375” |
| Room door with limited space (Scotland) | 2040mm x 610mm or 686mm x 40mm | 6’8” x 2’ or 2’3” x 1.575” |
| Standard room door (England & Wales) | 1981mm x 762mm x 35mm | 6’6” x 2’6” x 1.375” |
| Standard room door (Scotland) | 2040mm x 762mm x 40mm | 6’8” x 2’6” x 1.575” |
| Wheelchair access room door (England & Wales) | 1981mm x 838mm x 35mm | 6’6” x 2’9” x 1.375” |
| Wheelchair access room door (Scotland) | 2040mm x 838mm x 40mm | 6’8” x 2’9” x 1.575” |
| Older front doors (England & Wales) | 1981mm x 762mm x 44mm | 6’6” x 2’6” x 1.875” |
| Older front doors (Scotland) | 2040mm x 762mm x 44mm | 6’8” x 2’6” x 1.875” |
| More modern front doors (England & Wales) | 1981mm x 838mm x 44mm | 6’6” x 2’9” x 1.875” |
| More modern front doors (Scotland) | 2040mm x 838mm x 44mm | 6’8” x 2’9” x 1.875” |
So, What’s the Most Common Door Size in the UK?
If that’s a bit of information overload, then here’s the bottom line. There’s no such thing as a standard door size in the UK, but some doors are more common than others.
In England and Wales, the most common sizes for doors are:
- Internal – 1981mm x 762mm x 35mm
- External – 1981mm x 838mm x 44mm
In Scotland, the most common sizes for doors are:
- Internal – 2040mm x 762mm x 40mm
- External – 2040mm x 838mm x 44mm
Looking for the Perfect Standard or Made-to-Measure Doors?
Whichever size of doors you need, Door Warehouse can help. We’ve got a wide range of both internal and external options, and if the door openings at your property are non-standard, we provide a made-to-measure door service, too. Reach out today or head to our Deeside showroom and we’ll help you find the perfect doors for your project.
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