I will be installing a new interior door in a doorway that is 78cm wide and 205cm high and I'm a bit uncertain about these measurements and what applies.

Should I use 7x20 or 8x20 frames?
 
Answering a bit on my own question...
However, I haven't removed the old frame that's there now, but I hope there's enough space to fit an 8x21 or 8x20 according to Swedoor's list...
 
  • Table of door dimensions by Swedoor, listing sizes for different modules (7x21 to 15x21) including frame, opening, door leaf measurements, and thickness.
You need a door with a maximum frame outer dimension of 77cm. According to the list, an 8x21 door is 79cm so it won't work.
 
Let's hope they were generous with the width when setting up the studs... Otherwise, you'll have to reluctantly choose a 7x21 (or 20)...
 
There is a saw so you can saw off a cm on each side.

Protte
 
You can custom order a door. It's not a huge expense.
 
Protte, in the wall studs?
 
C
But if you have removed the frame, you can just measure between the studs exactly what it is, and then you'll know if it works or not?
 
B
can always make bigger holes
 
So, now the old frame is gone and between the studs it is 805mm. A bit tight, but it should be fine with 8?

I would rather not move the studs since it's a load-bearing wall.
 
C
It should go with 8 because 8 is meant to fit in a hole that is 800. :)
 
Exactly, it should work... :D

However, not much of an adjustment...
 
A doorframe that is 8*21

Typically it's 79*209cm to allow for adjustment. Your width is larger...

However, the height is a bit trickier.
 
The saw works there too.

Protte
 
The colleague messed up.
Framed a sunroom.
Measured and ordered a patio door.
The tinsmith put together a nice roof.
The expensive door arrived and turned out to be 5 cm too wide.
The colleague moved the framing and amused themselves with sheep...
 
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