"Hi. I am an interior design student in UK and I would like to know what are the standard sizes of internal sinlge doors? I have searched in several books, but I got confused with the plethora of data."

Our answer:

The width of a door is determined by its use and the room into which leads. According to the book architect's Data by Ernst and Peter Neufert, the minimun inside width of a door opening is 55cm. In residential spaces the standard door opening widths are as follows:

Single-panel-door from main room (bedrooms, living room etc) = approximately 80cm wide
Single-panel door for auxiliary rooms (bathroom) = approximately 70cm wide.

The standard sizes of internal doors in UK are as shown in the illustrations and tables below both in metric and imperial systems. The building standard size of wall apertures for doors are whole number multiples of 100mm (according to british standards).

Door sizes UK standards, door measurements, door dimensions

Door leaf	Structural Opening
526 x 2040mm	600 x 2100mm
626 x 2040mm	700 x 2100mm
726 x 2040mm	800 x 2100mm
826 x 2040mm	900 x 2100mm
926 x 2040mm	1000 x 2100mm
1026 x 2040mm	1100 x 2100mm
metric system

However the majority of UK doors are manufactured in imperial dimensions

Door leaf (feet)	Door leaf (iches)	Door leaf (mm)
1' 6" x 6' 6"	18' x 78'	457 x 1981mm
1' 9" x 6' 6"	21' x 78'	533 x 1981mm
2' x 6' 6"	24' x 78'	610 x 1981mm
2' 3" x 6' 6"	27' x 78'	686 x 1981mm
2' 6" x 6' 6"	30' x 78'	762 x 1981mm
2' 9" x 6' 6"	33' x 78'	838 x 1981mm
2' 10" x 6' 6"	34' x 78'	864 x 1981mm
imperial system

References

Kershaws doors (internal doors, common sizes Imperial & Metric)
BS 4787 (Internal and external wood doorsets, door leaves and frames. Specification for dimensional requirements)
Ernst Neufert, 2002. Neufert Architects' Data, Third Edition. 3rd Edition. Wiley-Blackwell.
David Littlefield, 2012. Metric Handbook: Planning and Design Data. 4 Edition. Routledge.

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