Average door sizes

"33 inch wide and 2.1m high AS a NORM for all doors."

"Usually 1:830X765
Unless personal preference is Authorised!!!"

"926 I believe and onwards
Depending on what you want personally"

"Standard height of the front and back doors

Front and back doors don't come in one standard size, they come in several. Standard height sizes for external doors begin at 80 inches (2.03m) and go up as high as 8ft (2.44m) tall. However, the most common standard size for a front door is 80 inches (2.03m) in height and 36 inches (0.91m) wide. Doors of this size will fit into an opening that is roughly 82 ½ inches (2.1m) high and 38 inches (0.96m) wide. The reason why the opening is slightly larger is to account for the jamb and the floor covering."

"There is no average size. Exterior door widths are generally 32inch. But you have to measure accurately.
Modern mass produced doors have little to plane down to fit. 10mm either side maximum.
Regards
Roger Camden"

"If in imperial and thing from 26inches to 38 inches or metric from 726, 826, 926 or 1026"

"There is no standard size for external doors .

The most common size for a front entrance door would be 2’9” x 6’6” ( 828 x 1981mm)

However, there are many other sizes to choose from especially if you are dealing with period properties

Best advice would be to measure your existing door

Internal doors are a little more standardised

2.0’ , 2’3””, 2’6”, and 2’9” all by 6’6” high are amongst the most common sizes available

The most used being 2’6” x 6’6”

The best policy , as before is to measure the existing door and get the nearest size to it
If it is not exactly the same always go to the larger size as it can be cut down to suit the opening

Hope this helps
Thanks Tony OBM"

"Usually the door leaf is 8250x2030 mm ( with x length )
and if you change the doors completely
(door leaf+ door frame) try to buy a proper set (properly frame dimension for door leaf dimension)"