A Guide to UK Standard Door Sizes

There is a wide variety of standard door sizes available in the UK. Oftentimes comparing and trying to make sense of them can be hard-going. Different manufacturers will offer various sizes of doors, and some homes require bespoke non-standard door sizes to be made.

We have provided a ‘core range’ list of the most prolific door sizes available to help you find the right size door for your home. 

Standard Door Sizes

Example of a Latham's Steel Front Door

There is no single standard door size used in the UK. There are, however, a few door sizes you will see that are common across homes and door manufacturers. These are generally displayed as width x height x depth, usually listed in millimeters:

457 x 1981 x 35mm or 533 x 1981 x 35mmOften used for wardrobe or cupboard door use
610 x 1981 x 35mm or 686 x 1981 x 35mmUsed where there may be limited wall space and a smaller door is required
762 x 1981 x 35mmOften referred to as a 2’6” door. The most typical internal door sizing in England & Wales
838 x 1981 x 35mmOften referred to as a 2’9” door. In most circumstances this provides the required opening width for wheelchair access under the Part ‘M’ mobility requirements of the Building Regulations 2010

The most common standard size door in width is:

762mm (metric) – 30 inches – 2’6” (imperial) in England and Wales (in Scotland, it is a little smaller, usually measuring 726mm – 28.5 inches).

The most common standard size door in height is:

1981mm (metric) – 78 inches – 6’6” (imperial) in England and Wales (in Scotland, it is a little taller at 2040mm – 80 inches).

Door Size Conversion Chart (Metric to Imperial)

The following chart shows internal and external door sizes available in the UK from a variety of manufacturers. If you measure in feet and inches (imperial), these charts will help you work out the metric equivalent, and vice-versa.

Not all manufacturers stock these sizes as standard. Some will offer bespoke made-to-measure services that will custom-build any size door to your own specifications. (Internal door sizes are listed in black. External door sizes are listed in red. Latham’s high security front door sizes are listed in blue).

Dimensions are shown as Height x Width

METRIC (mm)IMPERIAL (inches)IMPERIAL (feet & inches)
305 x 1981 12” x 78””1’ 0” x 6’ 6”
381 x 1981 15” x 78” 1’ 3” x 6’ 6”
457 x 1981 18” x 78” 1’ 6” x 6’ 6”
533 x 1981 21” x 78” 1’ 9” x 6’ 6”
610 x 1981 24” x 78” 2’ 0” x 6’ 6”
686 x 1981 27” x 78” 2’ 3” x 6’ 6”
711 x 1981 28” x 78” 2’ 4” x 6’ 6”
762 x 1981 30” x 78” 2’ 6” x 6’ 6”
838 x 1981 33” x 78” 2’ 9” x 6’ 6”
864 x 1981 34” x 78” 2’ 10” x 6’ 6”
915 x 198136” x 78” 3’ 0” x 6’ 6” 
1067 x 1981 42” x 78” 3’ 6” x 6’ 6”
1168 x 1981 46” x 78” 3’ 10” x 6’ 6”
1220 x 1981 48” x 78” 4’ 0” x 6’ 6”
1372 x 1981 54” x 78”4’ 6” x 6’ 6”
1524 x 1981 60” x 78” 5’ 0” x 6’ 6”
695 x 2020 27” x 80” 2’ 3” x 6’ 7”
795 x 2020 31” x 80” 2’ 7” x 6’ 7”
845 x 202033” x 80” 2’ 9” x 6’ 7”
895 x 202035” x 80” 2’ 11” x 6’ 7”
995 x 2020 39” x 80” 3’ 3” x 6’ 7”
1095 x 2020 43” x 80” 3’ 7” x 6’ 7”
1195 x 2020 47” x 80” 3’ 11” x 6’ 7”
813 x 2032 32” x 80” 2’ 8” x 6’ 8”
526 x 2040 20.7” x 80.3”1’ 8.7” x 6’ 8.3”
626 x 2040 24.6” x 80.3” 2’ 0.6” x 6’ 8.3” 
726 x 2040 28.6” x 80.3” 2’ 4.6” x 6’ 8.3”
826 x 2040 32.5” x 80.3” 2’ 8.5” x 6’ 8.3”
926 x 2040 36.5” x 80.3” 3’ 0.5” x 6’ 8.3”
864 x 2083 34” x 82” 2’ 10” x 6’ 10”
915 x 2134 36” x 84” 3’ 0” x 7’ 0”
Cottage style front door in chartwell green

We understand when choosing a new front door, style can be just as important as security. Take a look at our range of High Security Front Doors, available in a variety of sizes, personalisation options and 19-point locking mechanisms with a number of security options

Standard Door Thicknesses

Internal and external doors are available in various degrees of thickness, depending on the specific use. Thickness is displayed as the depth measurement on the product page, e.g. 762 x 1981 x 35mm.

You may use the following as a general rule of thumb:

Internal Doors

Personnel Doors: 35-40mm thick
Fire Doors: 35-54mm thick

External Doors

Personnel & Fire Doors: 44-54mm thick
Garage Doors 44mm thick

Fire Door Sizes

Red Latham's Fire Exit Door

All UK standard door sizes are typically available in a fire door equivalent. Measurements listed in blue in our conversion chart above are some of the available fire door sizes you can purchase from Latham’s Steel Security Doorsets.

Elsewhere, you can usually find fire door sizes ranging from:

  • 686 & 762mm x 1981mm
  • 526, 626, 726, 826 & 926mm x 2040mm

The most common specification for fire doors is their FD rating. This is a certified indication of how fire-resistant the door is, or the length of time it takes for fire to burn through the door.

Extra components and changes in material are used in the core construction of the door to improve its fire rating, which results in an increased thickness of around 45mm. This also means it cannot be trimmed down, so finding a fire door that fits is extremely important.

Fire ratings are stated in minutes and prefixed by the letters “FD”:

  • FD30 (30 minutes)
  • FD60 (60 minutes – 1 hour)
  • FD120 (120 minutes – 2 hours)
  • FD180 (180 minutes – 3 hours)
  • FD240 (240 minutes – 4 hours)

Sometimes higher ratings are necessary to protect property and assets, as well as people. Fire doors should not be altered in size as this can affect the door’s fire rating and it may not meet fire safety regulations. If you require a custom-made fire door, you will need to speak to a specialist or supplier who will be able to help you.

Also note that the frames, intumescent seals and ironmongery must be verified to comply with the door’s fire certification.

Fire rated front door fitted to apartments

Our stock steel fire rated doors are certified for up to two hours of fire protection, meaning they will cover all FD30, FD60 & FD120 requirements and will help to slow the spread of fire in an emergency situation

Garage Door Sizes

Because garage doors differ from standard internal and external doors, we suggest that you look at garage door specialists and their set of standard door sizes to determine which size will best fit your garage entryway. Standard UK garage door sizes are as follows: 

Dimensions are show as Width x Height

METRIC (mm)IMPERIAL (inches)IMPERIAL (feet & inches)
1981 x 213478” x 84”6’ 6” x 7’ 0”
2134 x 213484” x 84”7’ 0” x 7’ 0”
Security garage and garage side doors

We provide steel double doors large enough to be used as security side hinged garage doors in frame sizes from 1295mm to 2195mm wide.

How to Measure Your Door

The starting point is to always measure the opening that you have to fill (the space where your current door and frame is). Most doors can be trimmed/planed down to suit the opening you have, but this threshold for adjusting down your doors depends on your manufacturer.

Step 1: Measure the Width

Take 3 measurements for the width at the top, middle and bottom of the door, by running a measuring tape along one side of the door frame from left to right. Note down the smallest measurement.

Step 2: Measure the Height

Take 3 measurements for the height from the top to the bottom of the door, by running a measuring tape in a straight line on the left, middle and right sides of the door frame. Note down the smallest measurement.

Please note:

Some older doors may not be perfectly rectangular, so you may need to repeat this step but at another point on the door. You should write down a few measurements, then use the smallest measurement as the door width or height.

Step 3: Measure the Thickness

Run a measuring tape from the edge on one side, to the edge of the other. Note down the measurement. Measure the door jamb on the frame to check that they are a similar size as you may need to know both.

Watch our explainer video for further advice – How Do I Measure My Door Structural Opening?

If you are unfamiliar with certain door terms, we have provided a guide on door part terminology on our blog

What Tools Do I Need?

If you followed the 3 steps listed above, you can guess that the only essential tool you will need is a measuring tape.

We provide measuring tapes at Latham’s Hardware. There are also apps such as Tape Measure and EasyMeasure from the Apple store, or AR Ruler App for Android from Google app stores if you don’t have a measuring tape readily available.

FAQs (Frequently Asked Questions)

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