Floor plan design single-family house with around 150 m²

... maybe one could make a second entrance to the utility room? maybe nearby or with an adjoining garage or parking space?

Yes, I had also already thought about planning an exit directly to the laundry area and a laundry chute.

Upstairs we actually planned 11.5 cm sand-lime brick walls (for soundproofing), but the architect advised against it because of cracking and recommended a drywall double-layered with 60 mm insulation. He will still send us the soundproofing values. I think it comes out about the same since you don’t need plaster. Why do you ask?

Because of cracking, a sand-lime brick wall becomes a drywall? Is there any truth to that? Or is it more about the cracking in the wallet?

Das SH 142 XXL von Scanhaus Marlow Marlow könnte auch gut auf das Grundstück passen:

I would probably have chosen a floor plan like that as well if the plot were better shaped. I don't find the living room in the northwest so ideal, since there is a tall house to the west that blocks the light and is not something you necessarily want to see all the time. Therefore, having the living room in the southwest is better, as it tends to have a view to the south.

Another variant without tapering of the kitchen, which in my opinion offers more spaciousness and room. Access to the utility room through the kitchen has the advantage of also being able to serve as storage at the same time. Laundry chute in the bathroom is conceivable. Children's room increased to 15m² without significant losses in other rooms. Chimney almost optimally located in front of the roof ridge.

I would not set the fireplace back, so that it breaks up the wall. Personally, I like fireplaces where you still have a little bench in front of them that protrudes separately. The cat could lie there wonderfully.

Interesting idea! There are still many more possibilities after all.
I actually wanted to avoid access to the utility room through the kitchen.

The fireplace is also not set back, only the chimney. The fireplace is in any case 50 cm in front of the chimney (since it is double-sided) and the aforementioned bench could also be placed there.

I would probably have chosen a floor plan like that as well if the plot were better shaped.

Are the 11.65m already on both sides at the building line?

Because of cracking, a masonry aerated concrete wall becomes a drywall? Is there any truth to that? Or is it more about the cracking in the wallet?

No, there is enough money. I didn’t choose the supplier because of the low price, but because the seller knew his stuff and good materials, windows, etc. are being installed. If it had been more expensive with an even better seller, that would have been no problem either. But we didn’t find one. And everyone only builds with stones, so why should I spend more? Therefore, I place more value on the interior fittings, fireplace, shutters, etc. And about the cracks... yes, the drywall only because of that. The aerated concrete wall isn’t that much more expensive either. I also don’t want to keep filling and painting constantly.