Door Size Guide

Friday, 1 October 2021  |  Admin

Door Size Guide

Choosing a new door can be a little confusing - especially since doors in the UK don't have to be a specific size nor has the industry decided whether to fully move from imperial to metric sizes. Our door size guide below will let you convert all the common UK door sizes from imperial to metric and vice versa. Underneath each chart you can also find information regarding the thicknesses of each door type. Please note: not all doors are available in every size.

Don't know your required door size yet? Check out our handy guide on how to measure for a new door.

Important: when choosing a door size select the size closest to your required size and measurements. Most doors can usually be trimmed down by a few millimetres however this does not apply to certain types of doors. If in doubt, feel free to contact us for advice.

 

Internal Door Sizes

Imperial (inches)
Imperial (feet & inches)
Metric (mm)
78" x 15" 6'6" x 1'3" 1981 x 381
78" x 18" 6'6" x 1'6" 1981 x 457

78" x 21"

6'6" x 1'9" 1981 x 533
78" x 24" 6'6" x 2'0" 1981 x 610
78" x 27" 6'6" x 2'3" 1981 x 686
78" x 28" 6'6" x 2'4" 1981 x 711
78" x 30" 6'6" x 2'6" 1981 x 762
80" x 32" 6'6" x 2'8" 2032 x 813
78" x 33" 6'6" x 2'9" 1981 x 838
78" x 34" 6'6" x 2'10" 1981 x 864
78" x 36" 6'6" x 3'10" 1981 x 915
80 1/4" x 20 11/16" 6'8 1/4" x 1'8 11/16" 2040 x 526*
80 1/4" x 24 5/8" 6'8 1/4" x 2'0 5/8" 2040 x 626*
80 1/4" x 28 5/8" 6'8 1/4" x 2'4 5/8" 2040 x 726*
80 1/4" x 32 1/2" 6'8 1/4" x 2'8 1/2" 2040 x 826*
80 1/4" x 36 7/16" 6'8 1/4" x 3'0 7/16" 2040 x 926*

Internal Door Thicknesses: Most internal doors are available in 35mm thickness.
Internal fire doors are typically either 44mm (FD30) or 54mm (FD60) in thickness.

*Doors with '2040mm x' measurements are commonly referred to as metric doors and come with a thickness of 40mm.

 

External Door Sizes

Imperial (inches)
Imperial (feet & inches)
Metric (mm)
78" x 27" 6'6" x 2'3" 1981 x 686
78" x 30" 6'6" x 2'6" 1981 x 762
80" x 32" 6'8" x 2'8" 2032 x 813
78" x 33" 6'6" x 2'9" 1981 x 838
82" x 34" 6'10" x 2'10" 2083 x 864
78" x 36" 6'6" x 3'10" 1981 x 915
84" x 36" 7'0" x 3'0" 2134 x 915

External Door Thicknesses: Standard External Doors are usually 44mm or 54mm thick.

 

Internal Door Pair Sizes

Imperial (inches)
Imperial (feet & inches)
Metric (mm)
78" x 36" 6'6" x 3' 1981 x 915
78" x 42" 6'6" x 3'6" 1981 x 1067
78" x 46" 6'6" x 3'10" 1981 x 1168
78" x 48" 6'6" x 4'0" 1981 x 1220
78" x 54" 6'6" x 4'6" 1981 x 1372
78" x 60" 6'6" x 5'0" 1981 x 1524

Internal Door Pair Thicknesses: Like Standard Internal Doors, Door Pairs usually range from 35mm to 40mm in thickness.

 

Can't find the size you’re looking for?

A lot of doors are available in bespoke sizes to fit your specific needs. Please contact us if you are considering ordering a bespoke door. 
Please note: bespoke doors come on an extended lead time.


If you are unsure about which size to get, please contact us for advice