What internal doors sizes are available in the UK?
Doors typically come in a range of popular standard sizes and can often be trimmed a little to get an exact fit. This is true for kitchen doors, bathroom doors, bedroom doors, and all doors found in most homes. Custom doors are available which can be made to measure for doorways which do not match the standard sizes, but these will be more expensive and typically have a lead time of around 16 weeks.
Internal door leaves have typical thicknesses of 35mm (1 3/8") for imperial sizes or 40mm (1 2/3") for metric sizes. You can also get 44mm (1 3/4") and 54mm (2 1/8") doors - these thicker ones are usually fire-rated doors. Below are common standard door leaf sizes; individual manufacturers may not carry all these sizes and some might have a larger range of standard sizes.
Internal door sizes
These sizes are for the door leaf, allowances need to be taken if you need to install a frame into a rough opening
Popular internal door heights
Metric (mm)
Imperial (inches)
Standard imperial internal door heights
1981mm
78"
2032mm
80'"
Standard metric internal door height
2040mm
80 1/4"
Popular imperial internal door widths
Metric (mm)
Imperial (inches)
457mm
18"
533mm
21"
610mm
24"
686mm
27"
762mm
30"
813mm
32"
838mm
33"
864mm
34"
Popular metric internal door widths
Metric (mm)
Imperial (inches)
526mm
20 3/4"
626mm
24 5/8"
726mm
28 5/8"
826mm
32 1/2"
926mm
36 1/2"
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