Door Size Guide

One of the most important things to check when buying a new door is that it is the right size for the opening. While this may seem obvious, the large variety of standard sizes available and the differences between metric and imperial measurements can make it confusing to tell which size you need.

That’s why we’ve put together this handy guide to save you time and money by ensuring you get the right size door the first time.

Simply use the buttons below to jump to the relevant door type and check the table of standard door sizes. We’ve included both imperial and metric to help you convert measurements as needed. 

Can’t see the size you need? Try our bespoke door service to get an internal door built to your specifications.

If you need help measuring your current door to work out which size you need, click the link below to check out our useful guide.

How To Measure A Door

Standard UK Door Sizes

Internal Door Standard UK Sizes Chart

Metric (mm)

 Imperial (feet & inches) Imperial (inches)
1981 x 305 6ft 6" x 1ft 78" x 12"
1981 x 381 6ft 6" x 1ft 3" 78" x 15"
1981 x 457 6ft 6" x 1ft 6" 78" x 18"
1981 x 533 6ft 6" x 1ft 9" 78" x 21"
1981 x 610 6ft 6" x 2ft 78" x 24"
1981 x 686 6ft 6" x 2ft 3" 78" x 27"
1981 x 711 6ft 6" x 2ft 4" 78" x 28"
1981 x 762 6ft 6" x 2ft 6" 78" x 30"
2032 x 813 6ft 8" x 2ft 8" 80" x 32"
1981 x 838 6ft 6" x 2ft 9" 78" x 33"
1981 x 864 6ft 6" x 2ft 10" 78" x 34"
1981 x 913 6ft 6" x 2ft 11.9" 78" x 35.9"
2040 x 526 6ft 8.3" x 1ft 8.7" 80.3" x 20.7"
2040 x 626 6ft 8.3" x 2ft 0.6" 80.3" x 24.6"
2040 x 726 6ft 8.3" x 2ft 4.6" 80.3" x 28.6"
2040 x 826 6ft 8.3" x 2ft 8.5" 80.3" x 32.5"
2040 x 926 6ft 8.3" x 3ft 0.5" 80.3" x 36.5"

 

What are the most common internal door sizes?

To give you a general idea of the sizes available, we’ve listed some of the most common standard UK door sizes below. As with the doors on our website, we’ve listed them as height x width x thickness.

  • 1981 x 457/533 x 35mm – This door size is often used for cupboard or wardrobe doors.
  • 1981 x 610/686 x 35mm – A popular door size for restricted spaces where a smaller door is needed.
  • 1981 x 762 x 35mm - Also called a 2’6” door, this is the most common internal door size in England and Wales.
  • 1981 x 838 x 35mm – Also known as a 2’9” door, this is the best size for mobility and wheelchair acces

Which internal door thicknesses are available?

Our internal doors are available in various thicknesses, from the standard 35mm internal doors to 54mm FD60-rated fire doors. Thickness is always clearly listed on each product’s page at the end of the size. For a guideline of interior door thicknesses, you can use the following as a general rule of thumb:

  • Internal Doors: 35mm - 40mm thick.
  • Internal Fire Doors: 35mm - 54mm thick.

What’s the average width of a UK internal door?

Door widths vary across the UK. On average, England and Wales have a standard internal door width of 762mm, while Scotland’s is slightly smaller, at around 726mm.

Internal doors at Leader Online

Here at Leader Online, we have internal doors available in a range of standard sizes to suit specifications across the UK. Shop now to find the perfect match for your interiors.

External Door Standard UK Sizes Chart

Metric (mm)

 Imperial (feet & inches) Imperial (inches)
1981 x 686 6ft 6" x 2ft 3" 78" x 27"
1981 x 762 6ft 6" x 2ft 6" 78" x 30"
1981 x 838 6ft 6" x 2ft 9" 78" x 33"
1981 x 915 6ft 6" x 3ft 78" x 36"
2032 x 813 6ft 8" x 2ft 8" 80" x 32"
2040 x 726 6ft 8.3" x 2ft 4.6" 80.3" x 28.6"
2040 x 826 6ft 8.3" x 2ft 8.5" 80.3" x 32.5"
2040 x 926 6ft 8.3" x 3ft 0.5" 80.3" x 36.5"
2083 x 864 6ft 10" x 2ft 10" 82" x 34"

2134 x 915

 7ft x 3ft 84" x 36"

 

Which external door thicknesses are available?

Generally, most external doors are 44mm - 54mm thick. However, this will vary depending on the type of door. For example, fully double-glazed folding patio door sets can be up to 70mm thick. As with internal doors, thickness will be listed on each product page at the end of the size. As a general guideline:

  • External Doors: 44mm - 54mm thick.
  • External Fire Doors: 44mm - 54mm thick.
  • Garage Doors: 44mm thick.
  • French Patio, Folding & Sliding Doors: 44mm - 70mm thick.

External doors at Leader Online

We have a great selection available if you’re looking for a new front door or any other type of external door. Our external doors come in various sizes and are strong and durable enough to keep out both bad weather and potential intruders.

Pair Door & Double Door Standard UK Sizes Chart

Pair door measurements need to be exact so that there’s no overlapping or gapping when you fit them in a double door frame; otherwise, they won’t fit together.

Metric (mm)

 Imperial (feet & inches) Imperial (inches)
1981 x 915 6ft 6" x 3ft 78" x 36"
1981 x 1067 6ft 6" x 3ft 6" 78" x 42"
1981 x 1168 6ft 6" x 3ft 10" 78" x 46"
1981 x 1220 6ft 6" x 4ft 78" x 48"
1981 x 1372 6ft 6" x 4ft 6" 78" x 54"
1981 x 1512 6ft 6" x 4ft 11.5" 78" x 59.5"

 

Garage Door Standard Sizes 

Garage doors differ from standard external or internal doors, so you’ll need to look at a separate set of standard garage door sizes to determine which will be best for your garage entryway from the house.

Metric (mm)

 Imperial (feet & inches) Imperial (inches)
1981 x 2134 6ft 6" x 7ft 78" x 84"
2134 x 2134 7ft x 7ft 84" x 84"

 

Fire Door Standard Sizes 

Fire doors are slightly thicker than standard doors by around 45mm. Their construction involves using extra components in the core to improve their fire rating. This means they cannot be trimmed down, so finding a fire door that fits is extremely important.

Typical imperial fire door sizes are:

  •  27”x78”
  •  30”x78”
  •  22”x78”

They may also be available in smaller sizes of 24”x78”. 

Metric fire doors may also be available in standard sizes, including:

  • 626mm x 2040mm
  • 726mm x 2040mm
  • 926mm x 2040mm

All of our standard UK door sizes are typically available in a fire door equivalent. Shop the full range today, or read our guide to fire doors to learn more.

French Door Standard Sizes 

French doors are available in a wide range of sizes, though some manufacturers offer more size options than others. Typically, internal French doors are either 35mm or 40mm thick, while external French doors are 44mm thick and are available in sizes from:

  • 36”x78” - 42”x78”
  • 46”x78”
  • 48”78”
  • 54”78”
  • 60”78”

Consider fitting two single doors with a pair maker for larger French doors.

Can't Find Your Size? Go Bespoke

If you measure around the house and find that some of your frames and openings don't quite match any of our internal door sizes, just let us know! We can offer most of our internal oak and white primed doors in custom-made, bespoke sizes. If you have a bespoke requirement, please contact us, and we'll be happy to help. For more information on ordering bespoke-sized doors, please click here.

Find the Best Door for your space at Leader Online

We hope this guide has helped you find your perfect door size. If you want to replace a damaged door or renovate a home, we have many internal doors to choose from, including protective fire doors and our always-popular oak door collection.

Alternatively, if you’re looking to upgrade your external doors, we have a great selection available, all made from durable materials, such as hardwood.

If you have any questions about our sizes or need any help determining what size doors you require, please call our Door Experts on 01429 241 270. You can also speak to us anytime via the LiveChat at the bottom right of the screen or email using the button below. We'll aim to respond to all emails within 24 hours.

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