Single-family house, approx. 140 m², 2 children's rooms - What do you think of the floor plan?

The most central place is the pantry.

Have there already been measurements for the property? And what does the Bu in the site plan mean?

And access does not go through the upper right corner?

I do not like the staircase solution at all. If the staircase is closed off, it will become very narrow (i.e., between the staircase ascent and descent). Otherwise, I also don't like the hallway situation, especially in the first proposal where you have to slalom around the wardrobe and then come to a width of 1.13m. I once had 1.20m and already found that rather tight, especially with oncoming traffic, and those are raw construction dimensions, right (so it will get even narrower)?

A kitchen-living room with a separate sitting room totaling 48 sqm is on the one hand unexpectedly generous for such a settler’s witch’s cottage, but on the other hand definitely worthy of further consideration for a more successful layout.

I don’t believe in the 11.5 cm interior wall. Where exactly does the 45 cm exterior wall thickness come from?

The design overall gives a considerably more harmonious impression – but: have you taken my "high" opinion of the builder to heart?

I have already expressed my opinion about the builder.
We like the layout as it is. At least we wouldn’t know what we should do significantly differently in terms of layout. We would like the living room to be separate from the kitchen/dining area.

What do you mean by the 11.5 cm interior wall and the 45 cm exterior wall thickness?

Are there already measurements for the plot? And what does the Bu on the site plan mean?
And the access road doesn’t go over the upper right corner?

Bu stands for the bungalow currently under construction there. Unfortunately, access via the upper right corner is not possible.
The plot is approximately 750 sqm in size.

The hallway on the ground floor would be too narrow for me. How much space is there? It looks very much like a corridor.

see below.

I really don’t like the solution of the stairs. If the stairs are closed off then it will become very corridor-like (i.e. between stair up- and down-ways). Otherwise, I don’t like the hallway situation either, especially in the first proposal where you slalom around the wardrobe and then there are 1.13 m widths. I once had 1.20 m and found that already rather tight, especially with two-way traffic – and those are rough construction measurements, right (so it will get even tighter)?

You are not wrong about the closed staircase. Would it help if we turn the stairs back and leave the area under the stairs open or something similar? Would that make the hallway overall significantly more spacious?
In our current apartment, we have a hallway of 1.25 meters, but all doors open towards the hallway, which is quite annoying. The 1.13 meters is really not much, but this is only over a length of about 1.50 meters, and the doors do not open towards the hallway either.

We currently have one more question for which we would also appreciate your assessments.

According to the builder, the heating boiler could also be installed in the attic, which would leave a bit more space in the utility room. Advantages and disadvantages?
We want to use the utility room, among other things, for hanging/drying laundry. Does a heating boiler possibly emit heat, making it more practical to keep it in the utility room for drying laundry?

What do you mean by the 11.5 cm partition wall and the 45 cm exterior wall thickness?

I would expect a load-bearing wall as a partition wall, for which walls of at least 17.5 cm are used. 45 cm is not a standard block size at all – 36.5, 49, or increasingly 42.5 cm are common – and thus indicates a multi-layer wall structure. In my opinion, it is worth asking what kind of wall structure this is supposed to be.

Should a door lead north from the utility room or is a window sufficient?

I would install the door and omit the eastern door of the storage room for that purpose.

Does a heating boiler possibly still radiate heat, so that it would be more sensible to keep it in the utility room for drying clothes?

A boiler not at all, and a full-sized furnace – as they say – not anymore nowadays either.

Bu stands for the bungalow still under construction there. Unfortunately, access via the upper right corner is not possible. The plot is about 750 m² in size.

Oh, so it is the upper plot. By dimensions, width and depth are actually meant, not the area.

I would still make the house accessible from the south and move the window fronts of the living area to the south and west. It is not pleasant to enter a house with a convoluted hallway.

Does a heating boiler possibly still emit heat, making it more sensible to leave it in the utility room for drying laundry?

Doesn’t matter. When there is heating technology in the room, lint laundry has no business being dried there.