Is it permissible to move or modify a load-bearing wall without seeking any permits? Should it be reported in some way, and does it need to be inspected by someone?

We won't be doing it ourselves; a friend who has renovated and extended several houses will be doing it. I'm just a bit uncertain about the paperwork and want to do it correctly.

The structure in question is a bathroom wall on the upper floor. The wall, or a part of it, is to be moved about 30 cm.
 
Here is a floor plan if it helps. I have marked the wall in question and the idea is to move about 2m of it (in the middle) approximately 30 cm into the room.
 
  • Floor plan with several views of a house. A specific wall is marked in blue, indicating a proposed move of 2m section about 30cm into the room.
To make alterations to load-bearing structures, a building notification is required. Ask the municipality how it should look for a job like this. It is likely that they will want you to present some kind of control plan - but the municipality itself will not inspect.

But do you really have to tackle something load-bearing here? That's the supporting beam wall, right? Couldn't you move the wall in but let the actual support beams remain where they are?
 
Hmm, since I am not personally performing the procedure, you are speaking Greek to me ;-)

If it's as you say, the support beams can certainly remain. It's a section of about 2 meters in the middle of the wall that should be moved, not the whole wall.
 
Sure, the support beams run vertically between the ceiling joists of the attic and the top chord (the sloping part) of the roof truss. They are part of the roof truss and thus load-bearing. They can look slightly different - in our case, each support beam consists of two very thick planks nailed on either side of the beam and the top chord, but our house is probably a bit newer than yours.

The wall that separates the attic space (the area at the furthest end under the sloped roof) is often nailed to the support beams. That's why I call it a support beam wall, but constructions can vary - some houses lack certain support beams, and a while back we had a thread here where the entire wall consisted of thick planks and no obvious support beams could be distinguished.

So it can be a bit tricky. But if you bring in a carpenter/builder with some experience in old houses, they can probably see how it is set up.
 
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