I was going to ask a direct question on this subject. But I took a shufty at B&Q web site and see that they have doors that are 610mm wide. B&Q stock code 0000003164488
If 2 x 10mm door jambs are deducted then it would appear that a door opening can be as narrow as 59cm or 23.25"
I'm not quite sure what you're setting out to achieve!
Do you want a doorway which:
is as narrow as can possibly be achieved?
is as narrow as is legally permitted (if, indeed there is a limit)?
takes up as little wall space as possible?
As far as I know, 24" (about 610mm) is the narrowest standard room door you can buy. With such a door, the useable opening is *less* than you say because, when open, the edge of the hinge side of the door projects into the doorway by more than the thickness of the doorstop. I have a 24" door on a walk-in cupboard, and the useable opening is only about 22 1/2".
If this is for a bedroom, a narrow door could seriously limit your ability to get bedroom furniture (wardrobes, chests, etc.) in and out - even if you take the door off to maximise the opening.
Sorry. My question is misleading in terms of my objective. The door frame in question has a narrow width on the face where it would meet a skirting board. So I will be glueing and nailing 2 x 10mm battens to effectively reduce the doors width. Or I may just run the planer over the new skirting board until it matches the narrow part of the frame.
Making a doorway artificially narrow to suit a skirting board seems to display an extraordinary mental priority system! (If you don't mind me saying so!)
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