MEASURING YOUR DOORS AND SIZE GUIDE

When purchasing new doors customers are often surprised to find that doors come in quite a range of sizes. It is important when purchasing doors that you measure every door in your house as quite often there will be different size doors required even if all your doors look the same size. 

The easiest thing to do is measure your existing doors if they fit reasonably well. If you can’t measure the existing doors or they don't fit well, you will need to measure the opening of the door frame. You need the height, width and thickness.

Take three measurements at the top, middle and bottom in width
- See diagram Arrow's A

Take two measurements of the height at 2 different points
- See diagram Arrow's B

Use the larger of both sets of measurements as the size you require for the height and width.

Finally measure the thickness of the existing door or depth of the rebate - See diagram Arrow C

Choose carefully the closest match to your measurements in sizes available for the door you've chosen.
Remember doors can be trimmed down usually by up to 12mm overall in width and a little more in height.

The chart below shows a full range of door sizes that are produced by manufacturers. Its shows the measurements in metric and imperial (millimetres, feet and inches or just inches).
Please note not all sizes will be available in every door style. Generally, the more popular doors or doors that have been produced for a long time will have a larger range of available sizes.
Please see the "Available Sizes" drop down menu on the product page for available sizes of the door you are thinking of purchasing.
The most popular sizes in the UK ar highlighted in orange.

 
INTERNAL DOOR SIZES
Metric
(height x width)
Imperial
(height x width)
Imperial
(height x width)
Thickness - Standard Door
Thickness - Fire Door
(mm)
(feet & inches)
(inches)
(mm)
(mm)
981 x 305
6ft 6" x 1ft
78" x 12"
35mm
44mm
1981 x 381
6ft 6" x 1ft 3"
78" x 15"
35mm
44mm
1981 x 457
6ft 6" x 1ft 6"
78" x 18"
35mm
44mm
1981 x 533
6ft 6" x 1ft 9"
78" x 21"
35mm
44mm
1981 x 610
6ft 6" x 2ft
78" x 24"
35mm
44mm
1981 x 686
6ft 6" x 2ft 3"
78" x 27"
35mm
44mm
1981 x 711
6ft 6" x 2ft 4"
78" x 28"
35mm
44mm
1981 x 762
6ft 6" x 2ft 6"
78" x 30"
35mm
44mm
2032 x 813
6ft 8" x 2ft 8"
80" x 32"
35mm
44mm
1981 x 838
6ft 6" x 2ft 9"
78" x 33"
35mm
44mm
1981 x 864
6ft 6" x 2ft 10"
78" x 34"
35mm
44mm
1981 x 913
6ft 6" x 2ft 11.9"
78" x 35.9"
35mm
44mm
2040 x 526
6ft 8.3" x 1ft 8.7"
80.3" x 20.7"
40mm
44mm
2040 x 626
6ft 8.3" x 2ft 0.6"
80.3" x 24.6"
40mm
44mm
2040 x 726
6ft 8.3" x 2ft 4.6"
80.3" x 28.6"
40mm
44mm
2040 x 826
6ft 8.3" x 2ft 8.5"
80.3" x 32.5"
40mm
44mm
2040 x 926
6ft 8.3" x 3ft 0.5"
80.3" x 36.5
40mm
44mm
EXTERNAL DOOR SIZES
Metric
(height x width)
Imperial
(height x width)
Imperial
(height x width)
Thickness - Standard External
(mm)
(feet & inches)
(inches)
(mm)
1981 x 686
6ft 6" x 2ft 3"
78" x 27"
44mm
1981 x 762
6ft 6" x 2ft 6"
78" x 30"
44mm
1981 x 838
6ft 6" x 2ft 9"
78" x 33"
44mm
1981 x 915
6ft 6" x 3ft
78" x 36"
44mm
2032 x 813
6ft 8" x 2ft 8"
80" x 32"
44mm
2040 x 726
6ft 8.3" x 2ft 4.6"
80.3" x 28.6"
44mm
2040 x 826
6ft 8.3" x 2ft 8.5"
80.3" x 32.5"
44mm
2040 x 926
6ft 8.3" x 3ft 0.5"
80.3" x 36.5"
44mm
2083 x 864
6ft 10" x 2ft 10"
82" x 34"
44mm
2134 x 915
7ft x 3ft
84" x 36"
44mm