Tear down heart wall + side wall against outer wall - question about stability with outer wall
A constructor would probably respond best to that, considering it's difficult to see the house's construction based on a floor plan.
Those are quite significant alterations to the bearing wall(s?) so I would never dare to take a chance.
Those are quite significant alterations to the bearing wall(s?) so I would never dare to take a chance.
When was the house built?
I forgot to mention that it is a 1½-story brick villa built in 1957. According to a structural engineer I spoke with today, the demolished sidewall (not the heart wall) does not affect the stability of the exterior wall. So the small "stump" I wrote LEAVE BEHIND? on is not needed.
It is not a brick villa but a house with a wooden frame externally clad with facade bricks. Since it is a 1 1/2-story house, the heart wall is load-bearing and must be replaced by beams, possibly with an extra pillar for support over the long stretch to keep the height down. It is difficult to say more without a dimensioned drawing.
Correct as you point out, I am not a builder. It is a timber frame externally clad with facade bricks. But it wasn't the load-bearing wall that was the main question, rather if the outer wall needs support if you remove the side wall, see the red arrow in the attached image. According to the response from the structural engineer (see above), it is not needed, thus the matter is resolved.
In log houses, it is necessary to leave a piece to prevent the wall from tilting. But not in other houses. In the places where "stumpar" have been left, they contain the beam that supports the alternating beam replacing the load-bearing wall.
Thank you for your answers, I am satisfied with the info I received! 
The question is not quite so simple. Even long regular walls may need lateral stabilization. In this case, there are plenty of side walls on the other side of the house that fulfill that task. Houses located in wind-exposed areas may require extra reinforcement despite the presence of walls.
Thank you Justus. I have to trust the civil engineer's statement that in this case it is not needed, see above.