Floor plan 200m² single-family house, raised ground floor, existing plot, double garage

One question still came to my mind, which the architect did answer for me, but I no longer believe him. He draws load-bearing walls with 24cm and all others with 11cm. Allegedly, that is completely normal... But with 11cm between the children's rooms with hollow bricks, doesn't one hear everything and everyone? What would one have to plan here to make it reasonably quiet?

I suspect he failed at it and that's why he went for 2 full stories.

No, in my opinion, that is not the reason. The landing staircase would work. However, it takes up a bit more space, which is why everything seems a little tighter again. The reason is more likely the budget. Or who said:

...that he now took a 36.5 exterior wall, we have to save, otherwise the house will be too expensive.

What that has to do with the exterior wall is, however, beyond me.

For 750K, the 3rd floor should definitely be possible or at least comfortably the 200 sqm. Have you even asked alternative providers?

But with 11cm between the children's rooms using perforated bricks, don't you hear everything and everyone? What would need to be planned here to make it reasonably quiet?

One of the quietest stones is, as far as I know, sand-lime brick. However, it insulates poorly. Some therefore use this stone on the inside and something else on the outside. Whether and how that works, I have no experience with that.

No, in my opinion that is not the reason. The podium stairs would work. However, they take up a bit more space, which makes everything feel a bit tighter again.
The reason is probably the budget.
Or who said that:

What that has to do with the exterior wall, however, is beyond me.

The architect said that. Our construction manager and two general contractors said it is completely within the price range. But our artist disagrees.
Yes, we lose living space because of the thick bricks, he would have to make the house bigger and that costs too much for the non-existent benefit.

For 750K the third floor should definitely be feasible, or at least comfortably the 200 sqm. Have you even asked alternative providers?

The general contractor said we would come out at 650k.
Another said rather 600k, depending on the equipment.

One of the quietest stones is, to my knowledge, sand-lime brick. However, it has poor insulation. Some therefore use this stone inside and something else outside. Whether and how that works, I have no experience with.

Talk to the construction manager whether he offers that for the interior work. But 11.5 cm walls are normal, right?

that he now took a 36.5 exterior wall, we have to save, otherwise the house will be too expensive. He even managed to fit everything into two floors, we don't even need the attic and if that works for us now, he would finish it.

What that has to do with the exterior wall is beyond me, though.

The architect no longer smokes the chemtrails since he discovered them in liquid form. Now he chugs them as energy drinks.

Yes, we lose living space because of the thick bricks, he would have to make the house bigger and that costs too much for the non-existent benefit.

There must be other substances at work in Malmsheimer’s sense.
I currently lack the time and desire to scroll back – but I suspect somewhere I have at least hinted at doubts about this architect’s competence. What he’s concocting is somehow not of this world. Therefore, it’s hardly possible to engage with it on a factual-argumentative level.

One of the quietest stones is, as far as I know, sand-lime brick. However, it insulates poorly. Some therefore use this stone inside and something else outside. Whether and how that works, I have no experience with.

That works so well that the corporation owning the two supposedly competing market leaders for aerated concrete blocks and the market leader for sand-lime bricks has bought exactly this combination of companies. Customers love it and largely adhere to the religion that nothing insulates sound better than a highly dense = heavy stone. At the corners where the sand-lime brick walls meet the aerated concrete walls, expansion joints are recommended.

Talk to the construction manager about whether he offers that for interior finishing. But 11.5 cm walls are normal, right?

“Interior finishing” is something entirely different again. But non-load-bearing interior walls nowadays are a separate step, possibly performed by other people. 11.5 cm walls as a blanket solution are very popular among many planners – totally indifferent if they belong where they are drawn. What rather irritated me were the uniformly 24 cm thick load-bearing interior walls. Those are actually a hint at an older architect, but then he would also have the eight-meter module still in his blood. At this point, the system was identical whether socialist or imperialist. I can’t make sense of the guy. However, I am not available here for a consulting mandate and only replied today because apparently some notification must have interrupted my unsubscribing from this thread.

Switch to a competent architect (and browse through the threads here on interior wall sound insulation, it has all been extensively discussed).