Building plan stipulates knee wall is inadmissible

Yes, I think I mean what you mean, basically building the house more in depth and then putting the knee wall on top.

I had the whole time the semi-detached house from Danwood Partner 132 in mind.. I’m still on the go, writing with my phone.. I’ll send the pictures I uploaded in a moment, if I’m allowed to here (they are links but directly to .png) otherwise via private message

With the house above that I had in my sights.. that's why I meant extending walls

You can only send PN here after 100 posts, but at the bottom left of the post window it says "Attach files".

I had had my eye on the semi-detached house from Danwood Partner 132 the whole time..

I still haven’t understood extending walls. However, the mentioned house model is already almost 13 m deep, but also not so easy to convert to a knee wall (or nothing) instead of a dwarf wall. Better choose a more closely related base model (or plan individually). Is the Danwood just inspiration for you or do you want to build with them?

The forum help leads you to a whole series of posts where I have presented my views on building a semi-detached house individually.

Well, not necessarily Danwood. They are just very transparent with the prices and also reasonable in terms of price, how it looks (changing the roof pitch by one degree costs 500, leaving out the knee wall – no idea yet, I'll get an offer in the next few days). By extending the wall I mean, for example, the walls at the bottom are 12 meters long.. so the exterior wall, then extending it to 13 meters so that in principle I get the same living space upstairs without a knee wall and with a dwarf wall as if the walls were only 12 meters long. I hope I have made myself somewhat understandable

By "mit abkoffern" you mean extending walls/roof,

No. Nothing is being extended.
Let's put it this way: the usual way, when you don't build with sand-lime bricks. Box in inside... build a wall... well...
The Danwood DH 132 is only suitable with dormers.
It's better to choose such a house from the start than to remodel something that's not designed for it.

Oh, so you want to increase the house depth or fully utilize it as suggested. Leaving out the knee wall is not a matter of price, but also means re-planning. A house depth of 13 m at the bottom and a roof pitch of 35° practically means a house depth of 10.20 m in the attic with a knee wall height of 1 m (knee wall height approximately equal to the parapet height of the dormer windows is the least complicated). And in the case of semi-detached houses, in my opinion, it should be planned together with the semi-detached partner.