Another hipped roof city villa (240 sqm)

An aquarium fan - how nice! I am one too! Have 3, how many do you have? I have also prepared a spot in the living room for my future (not yet done) 200x60x60 tank. So far, there is only a 130 one.
Remember, no underfloor heating there, otherwise it will be crushed.

A floor plan might be a start, but for 750k it’s too flat and flawed. Especially the lighting in the hallway is a problem; it can’t stay like that with that kind of money.
I wouldn’t push for separating the floors either. You would expect the entrance to the living area exactly at the location of the tank.
Does the garage have to be attached to the house? Huge utility room, bedroom next to kids’ room – those are some little mistakes that don’t have to be. My predecessors already mentioned them.

With that kind of money, you could probably build a brilliant palace. Why don’t you get an architect?

Regarding the points:

2 apartments
Before everyone gets fixated on this: I did not design the floor plan with that in mind. Rather, at some point (when the floor plan already looked like this), I noticed that you could quite easily turn it into 2 apartments… I think that is a nice-to-have but NOT a must! The plan was also not to rent to strangers, but rather as a multi-generational house in case one of the sons can’t move away.

The goal is, of course, to find the perfect floor plan for a single-family house!

Budget
Yes, 750k is a lot, but it’s also for everything tutti completti! So not just the house, but the basement, driveway, terrace, garden, double garage, kitchen, furnishings, etc… I believe you all know better than I do what all that adds up to. And I’m definitely talking about golden faucets… Whoever builds me a palace here in the southern Munich area with that gets hired immediately! Everything here feels about 30% more expensive across the board.

Balcony
You are right: being so narrow is relatively useless. I definitely want a bay window, and a balcony just fits right above it. You could simply extend the balcony on the left side, which is not above the bay window, and then I would also have a nice covered terrace part underneath, like in google: Arge Haus Haus des Jahres. (You’re not allowed to link, right?)

Utility room too large
I (and especially my wife) don’t see it that way. Anyone with children knows how often the washing machine runs… Then the ironing board should be allowed to stand permanently without constantly needing to be folded up and put away. Then you need a clothes rack, etc. Given how much time she will spend in there, it is absolutely understandable that she wants it spacious!

That the utility room at that spot takes space away from the kitchen is an argument against the position of the utility room, but not against its size.

Gallery
Maybe the wall between the stairs and the gallery is misleading. It is supposed to be “open” there, i.e., only a glass railing or similar. Or would that still not be a gallery? I don’t know how else to call it…

Aquarium
Nice that there are also aquarists here! Then you at least appreciate a nice display tank. Currently, I only have an approx. 400L (130x60x50) tank.
I will keep the floor heating cutout and the statics in mind.

Architect
Yes, we will get one (at least for the designs). Mainly because of the slight slope. Whether entirely with an architect, we don’t know yet. Currently, we are tending more towards a solid construction general contractor with a design by an architect. (The architect will of course have free rein and I will not restrict him with my designs.)

Plot
I will upload the site plan later. Only then can the driveway and the location of the garage be discussed.

So the kitchen is not adjacent to the terrace?

No. The right side/east is planned as a slope so that the office and hobby room in the basement get windows.

Do you have direct garden access from the ground floor?

Despite a slight slope, it is planned that way, yes.

The dressing room has a few unnecessary corners.

The recesses are intended for cupboards. What else should be unnecessary, I cannot see.

that you could relatively easily make 2 apartments out of it… I find that a nice-to-have

But the simplicity is not there at all. Tip: either you want it or you don’t. This should be clearly defined at the beginning of the draft, and then the house is designed accordingly.

The goal is of course to find a perfect floor plan for a single-family house!

Then please delete this draft.

And I’m definitely talking about golden faucets

I definitely want a bay window

Why?

and a balcony just fits above it.

But that costs more than a flat roof, which is not a balcony.

Utility room too big
I (and especially my wife) don’t see it that way. Anyone with children knows how often the washing machine runs… Then the ironing board should be allowed to stay set up permanently without constantly having to be folded up and put away.

Considering how much time she spends in there, you can absolutely understand that she wants to have it generously sized!

The housewife gets a study. That is generous… Ok: if she wishes it, then she should get it. I or my husband prefer to iron in a more homely room, where Netflix and so on sweeten the ironing.

Or is it still not a gallery then? I don’t know how else to call it…

That is still an open space. Open spaces have the property of basically just being open space. A gallery is an open room connected to an open space.

Currently we are tending more towards a solid construction general contractor with a design from an architect.

Good decision. However, I wouldn’t build a general contractor build in this price range. Google here for user R.Hotzenplotz. He also built or is still building in this price range.

Personal price limit for the house, including equipment: 750,000€

Yes, 750k is a lot, but it’s for everything tutti completti! So not only the house, but basement, driveway, terrace, garden, double garage, kitchen, interior etc…

Oh, that contradicts itself. That only leaves 550,000 left. What about the incidental building costs? Do they also have to be paid from that?

Here’s a tip: you have a lot of floor area, but not really added value by that. Also the forced basement because of the slope.
I also see oversized size on the ground floor and basement because of the needed sqm on the upper floor.
I would probably, also to keep costs more manageable, consider:
In the basement parents’ area with large office, where ironing is also allowed and possibly with outside access.
Functional rooms effectively and no placeholder rooms that are basically unnecessary and will just be cluttered later.

Rethink the open space because of the echoing loud noises in favor of the children’s sleep or plan it completely differently. Maybe the children in the basement if you can’t do without gallery/open space? Depends on the slope… then parents/office in the upper floor…
But basically: do not build unnecessary corners within a rectangle. With you, impossible rooms, areas and accesses arise. Especially if you have dealt with Feng Shui, you know that they are rather negative.
(I wouldn’t know what an aquarium is doing in the middle of the house either )
You say it yourself: no run-of-the-mill… but the house itself doesn’t have to be reinvented.

No. The right side/east is planned as a slope so that the office and the hobby room in the basement get windows.

Despite some gradient, that is how it is planned, yes.

The recesses are intended for cabinets. What else should be unnecessary, I cannot see.

Built-in cupboards are planned in such a way that they do not stand out at the back or in the front. Everything should be flush so that you simply do not notice them. Here they are clumsily placed in a room without paying attention to the adjacent room(s).

Is the slope such that the living area should rather be placed in the basement?

And I am definitely talking about golden faucets

Of course, the word not is missing here.
Isn't that called a Freudian slip?