Floor plan design single-family house with around 150 m²

But first finish the floor plan decision, we'll clarify such details better at the construction drawing level.

What does the decision about the wall material have to do with the floor plan? Isn't it more of a gut feeling? Is it actually problematic or much more time-consuming to install a sand-lime brick wall, or is that also common in single-family home construction? You hear that many solid house providers do drywall on the ground floor, I thought that might be because of the high labor effort for sand-lime bricks...?

What does the decision about the wall material have to do with the floor plan?

Only when you know where which wall runs can you say: "in the section from x to y we use a different material (/construct it differently etc.)." The execution planning always comes only after the design planning is finalized.

Isn't it more of a gut feeling?

Absolutely. The two and a half decibel difference according to some datasheets you either don’t hear in practice or you even perceive it the other way around. That’s why it’s always a gut feeling whether you trust the stone more than the stud wall.
Objectively, neither of the two is dramatically better than the other; the bigger difference is made by your "feeling." Ideally, the variant you tend towards is the same one the contractor has more routine with.

Is it actually problematic or much more time-consuming to install a sand-lime brick wall or is that also common in single-family home construction?

There is a general trend to build the non-load-bearing interior walls only after the exterior and load-bearing interior walls. Time is wage; the material price is (relatively) ignored; quick processing counts. In small residential construction KS is more frequent, in large residential construction gypsum boards are more common, and in commercial construction as much as possible is built lightweight.

One hears that many solid house providers do drywall in the ground floor; I thought that might be due to the high labor effort for KS...?

This is done more frequently on the upper floor and the attic. On the upper floor it is easier for the statics if the walls there do not stand above those of the ground floor. In the attic, the trend towards lightweight construction comes from roof insulation: in the past, the interior walls "stepped" into the rafter level; today the interior wall is supposed to end at the top in a straight inclined line. That is less laborious to fabricate with stud walls. Additionally, drywall does not require a master craftsman license, which makes subcontracting considerably easier.

What does the choice of wall material have to do with the layout? .....

for KS...?

I also wonder what this question has to do with this topic "layout planning". You are questioning your own question in your own thread [emoji23]

Hi, if your concern is purely about the noises or their transmission, I can reassure you regarding the drywall. We have boarded it with gypsum + OSB and the bathroom is directly next to the bedroom. All the pipes were insulated and insulation was placed in the wall, and except for a very faint noise, you don’t hear anything. And compared to a KS wall (at my mother’s, the guest room is also next to the bathroom), I find it significantly quieter in our case. Best regards, Tina

Hi, if your concern is purely about the noises or their transmission, I can reassure you regarding the drywall. We have boarded with gypsum + OSB and the bathroom is directly next to the bedroom. All the pipes are insulated and there is insulation in the wall, and except for a very faint noise, you don’t hear anything. And compared to a sand-lime brick wall (at my mom’s, the guest room is also next to the bathroom), I find it significantly quieter in our case. Best regards, Tina

Thank you for your opinion, it probably always depends on the workmanship of the drywall how much you hear. And also on how many sockets or other openings there are in the wall to the other room, because that naturally transmits the sound even better. We are currently leaning towards drywall. If the price is okay, maybe with better panels, which would allow even more insulation.

I have another question about our guest bathroom on the ground floor: the size is about 3 x 1.4 m, and the associated window faces the north side. Currently, the window is planned like the hallway window at 1 x 0.76 m, and we are wondering whether that is a bit too small for the bathroom. On the north side of the house, there is another window measuring 1.13 x 1.38 m; for example, one could enlarge the window to 1 x 1.38 or 1.13 x 1.38 to remain symmetrical. I would also like a double casement window (e.g., 1.51 x 1), but then there would be a new window size on that side, and it would probably look very busy. We made the window narrow (and tall) for the reason that we did not want viewers from the street. But of course, having the bathroom too dark is also bad...