Single-family house floor plan 11.5 x 8.5 on 475 sqm plot

I find the layout of the 2 bathrooms on the upper floor strange. For me, the shower bathroom lacks a sink, or do you not wash your hands after using the toilet? I would remove the shower from the ground floor, change the kitchen so that a small office is possible next to it. With the 2 tables and the desk, far too much space is simply wasted.

Does a double garage have to fit on the narrow plot? I think the house takes priority. Take a look at the show home Hanse Haus Variant 169 in Bad Vilbel. Slightly narrower, slightly longer. The upper floor would be okay like that, I think. The ground floor needs to be adjusted. On the ground floor WC, small study, eat-in kitchen, living room separate, wardrobe, less hallway. For that, I would place the entrance on the side.

First of all, thank you very much for the time you put into the feedback here.
I will try to answer the most important questions or remarks for us in order.

Budget: the 350,000 is intended as a loan solely for the house construction. The developed plot will be paid fully from equity (approx. 160,000 including notary, etc.)
The immediately available equity reserve is about 70,000 and is intended for the outdoor area, incidental construction costs, and new furniture. The planned rate of 1,200 has been easily put aside over the last few months (since my wife started working again after parental leave), plus the “bonus” of the saved cold rent.

Storage issue: The current living situation is such that we have about 100 sqm plus approx. 30 sqm of cellar. And even though we separate ourselves well from unnecessary things, it’s all full. And we somehow wanted to avoid finding out after moving in that winter shoes have to go into the children’s room and the water crates into the toilet.

2 dining tables: We adopted what we really liked in our current apartment over the last years. We definitely want a closed kitchen including dining area – we also value eating together very much. We have measured the space in the kitchen with 2m x 2m in our current kitchen so that one can sit comfortably in every seat, without the person in the back being squeezed or pathways being blocked.
: the space to the right of the table. You are right: if after moving in it turns out that there really is still space left there, then the table will move half a meter to the right and the pantry cupboard (which will be newly bought anyway) will be bigger.
@Ysop: what is drawn in is the existing line. Whether there will still be enough space for another cupboard will be clear when we know the dimensions exactly to the centimeter:

=> However, we will take a closer look at the kitchen to see if too much space is planned “for safety” or if, for example, the wall between kitchen and dining room could be shifted towards the kitchen.

The “dining table” in the dining room has proven itself with us and we don’t want to miss it. As a crafting table that doesn’t have to be tidied up for every dinner, for the “adult game night” that doesn’t have to take place in the kitchen, as a dining table for smaller family celebrations (when the table from the kitchen can easily be “attached” without me sitting on my mother-in-law’s lap), as a “hobby table” (we both love to do puzzles and it’s no fun in the kitchen).

Office: We thought about it extensively but repeatedly found that we don’t need it. Neither of us has a profession where one regularly prepares something at home (e.g. teacher) or “quickly does something for work” in the evening. This would remain so even if we changed jobs. During times of home office, no more than a laptop was needed and when the kids are at home, it doesn’t matter whether you have your own office or sit in the “dining room.”
I think if we rename the dining room to “mom+dad room” (analogous to the children’s room) or “parents’ leisure room” with hobby and play table, then it much more closely reflects our reality.

: We are four people. We do not have and do not want a dryer => therefore space for drying laundry in the utility room.

=> Cloakroom: we only have one in the very long hallway in our current apartment with similar dimensions and have arranged it quite nicely visually.
But yes – we are not completely happy with it in the current planning. As a spontaneous idea, I will try to spare a corner either in the utility room or the kitchen so that something can be improved without the utility room or kitchen ending up without a window. Or rather reconsider the necessity of the shower in the downstairs bathroom.

@matte: yes, I obviously forgot to draw the sink in the upstairs toilet – I wanted to do that depending on the position of the windows at first, but so we don’t forget it, I added it right away on the sketch.

The bathrooms upstairs: Since the rooms are very narrow, we intentionally separated them like this at first because in our opinion the whole thing would have looked very tunnel-like otherwise. But the bathroom on the ground floor was already drawn.
=> Thanks to the feedback, as said, we are considering whether the second shower on the ground floor is still necessary.

: Double garage: Two parking spaces are required (the garage driveway is explicitly (unfortunately) NOT counted according to the development plan).
If I’m already affording a house, I definitely don’t want to scrape windows in winter:
Therefore: the car definitely goes in the garage. This rules out carport/gravel parking space as the second parking space – I can’t put the stuff there that usually also goes into the garage.
However, we will ask the municipality again whether there is a “minimum width” for a parking space. Since we prefer a masonry garage, we would not be restricted to standard sizes and might be able to gain some width for the house this way.
As a house size, we would prefer 9x11 rather than 8.5x11.5 since we noticed the lack of width as a restriction during planning. It could also be that the plot is finally 18.6 m wide instead of 18.3 m. For now, we have planned so that the house definitely fits.

Thanks again so far – for some questions, it really makes sense to take another look. Nevertheless, we are also glad that the plan didn’t completely fail.

The general contractor will see our plan in 2 weeks

Definitely not!
He might still build that thing for you.

Whether there is space for another cupboard will become clear once we know the measurements down to the centimeter:

Good grief, you're already planning down to the centimeter?

And we somehow wanted to avoid finding out after moving in that the winter shoes have to go into the kids' room and the water crates into the toilet.

But that’s exactly how it will be.

Now let's be frank...
I don't know HOW you live or WHAT you do or are, but you have to look at the whole thing realistically:
A 1-meter hallway doesn't have an adequate wardrobe, nor space for a wardrobe cabinet 60cm deep for 4 people, mind you.
The kitchen furniture may be there and just about fit, but such a large kitchen is wasted if it doesn't result in a two-row layout in L-shape.
There is hardly any door that allows space behind it for a cupboard. Even the door to the living room has to open the wrong way, otherwise it becomes too tight.
Your dining table can't be extended with the kitchen table because then you can't sit down anymore due to the sideboard and desk.
Your living area is, if you look exactly, only 1.90 meters wide. That's it, unless you want to sit in line with the exit.
The shower bath is overcrowded but only has an emergency shower. The utility room isn't very big, as you say. It may be adequate, no more.
30cm on the right side of the bed is far too little. I (slim) could still stand there, but not move anymore.
Two bathrooms might seem sensible, but only if they are fully equipped. Not everyone is allowed in the toilet here.
Storage space is missing.
What’s good: there is space planned for a reasonable wardrobe.
At least 3 meters, I always say.
Where, for example, will your guests sleep? In the room where playing took place? And what about some peace for someone who uses the PC?
Where do you collect the laundry? Shower bath or utility room? Or sometimes here and sometimes there? And why do you even do laundry downstairs when the laundry is generated upstairs? Of course, you could just simply draw the washing machine upstairs, but is THAT planning? Or rather arbitrariness?
Why should one constantly walk back and forth in the kitchen when ergonomics suggest working more in a triangle?
And how do several teenagers watch TV when it’s around the corner?
I don’t even want to count the boxes, how long the hallway is. Double that, and it results in a rather wasteful hallway area without purpose.

The task of a general contractor is to create a plan.
It is not a task for laypeople.
You say what you want. He draws or picks a catalog house type that can be modified.
He can immediately tell you the price of a normal single-family house without frills in the standard of his construction service description by type and size of the house.

P.S. Some centimeters are always lost from drawn plans due to plaster. Then come the baseboards. Cupboards are sometimes placed up to 8cm away from the wall anyway. So plan these buffers in. Tiles come in the bathroom as well.

In one house we also had a kitchen-living room. However, the kitchen was an L shape and the dining table was in a corner with a corner bench. As I said, with the long row you waste space that is missing elsewhere. And the kitchen doesn't seem cozy to me either. You have to be able and willing to afford two dining tables right next to each other. My priority would lie elsewhere.

How many square meters do you have in total and roughly where is it supposed to be built? I would definitely calculate a buffer on top of the 350k.