Floor plan of a small bungalow with a wooden facade

The goal of the planning was, among other things, to minimize traffic routes. Therefore, there are practically no corridors.

This is a typical lay planner goal, unfortunately it leads into a trap (the traffic area paradox): the areas actually consumed for traffic routes even increase when trying to save on "corridors".

Is it impractical to want to use the HAR as a cloakroom? The children are under 10 years old. I have never been able to try that out in everyday life.

Yes, it is impractical - where does your current main residence everyday life take place, if you don't know that yet?

I would first of all question the targeted 280,000, with the garage built into the hangar never. It alone consumes a fortune. Or a lot of personal effort....

Thank you for the numerous feedback, it helps me a lot!

Well, you won’t find any space at all, because the technology has to go in there, it’s already quite small for that. I don’t see any multi-use there.

The planning of the room is still outstanding. The controlled residential ventilation + heat pump should take up < 1m². Water and electricity meters are outside the building. I therefore assumed that a small wardrobe and washing machine could be accommodated. I will take this point to the planner.

I find it not easy to appropriately comment on this floor plan. You currently live in the house with children, and this new, smaller house is ultimately supposed to be for old age but also for children. The two of you could live much more openly and would only have to reflect your both needs and peculiarities. As it is, it has to work as a holiday home and then for teenagers or young adults, of whom you don’t know how they will be or how your life with them will be at all.
I could rather imagine a solution where the youth rooms or guest rooms even have direct outside access and I don’t have to share my private space with my wife in old age on even smaller space than before and have to endure their justified peculiarities. A home in old age should fit me and my partner and maybe can also have space for visitors (children, acquaintances....).
In my opinion this floor plan has to cover too many needs and already gets problems with simple things like, for example, a wardrobe, perhaps a more generous utility room or similar.

You exactly address the crux that kept us from building for years. It is a conflict of goals that currently cannot be resolved. An alternative would be to build later. Whether you still want to do that then and can and want to finance it is another question.
Currently, we live in a large city in an apartment of a similar size. Therefore, I have no concerns about privacy. Initially, I wanted to plan with 3 rooms. This was strongly advised against because it would be very disadvantageous for a possible resale (worst case).

Have you already furnished the open-plan room? A square room is hard to zone into a TV area and dining area.
I would probably spontaneously rotate the house. Otherwise, I think that the lower symmetry in the plan and the lack of privacy for the parents do not do the design any good.

The symmetry is probably the second layman’s error. This results from the design with the central dormer in the gable roof, which first enables the open living space. The problem of furnishing has already caught my attention. What do you understand by the parents’ privacy?
Why would you rotate the house? I intended to look from the living room into the large garden to the east. Also, this would result in an east-west orientation of the roof surfaces for photovoltaics.

This is a typical layman’s planning goal, unfortunately it leads into a trap (of the traffic area paradox): the effective area used for circulation paths even increases when one tries to save "corridors."

Yes, it is impractical – where does your current main residence daily life take place if you don’t know that yet?

I am open to counterproposals. Would a niche for a built-in wardrobe make sense?

Attached are two designs that we have now discarded. Maybe there is more potential than expected.

I would first question the targeted 280,000, a garage built into the slope never. Alone that devours a fortune. Or very much own work....

The garage will not be included in the budget and must come later. But since this is essential for access, property layout etc., I have mentioned it here. Because I am also happy to hear feedback on this. For the house alone with foundation slab, the budget so far fits quite well.

The budget so far fits quite well for the house alone with the foundation slab.

I'm just wondering, usually it's always preached like a mantra that nothing works below 3,000/sqm, everyone is completely silent. If I think about the earthworks alone, 3 m height difference, connections to SW/RW, and you're at around 2,500 all-in. Or is all that on top?

The controlled residential ventilation + heat pump should take up < 1m².

Who says that? Surely technology today is not that big anymore, but you still need pipes that must be accessible between device and wall. A craftsman also moves around it, a water storage tank is also bulky, etc.

Water and electricity meters are outside the building.

And that needs to be explained to us, i.e. to the forum. From where is the water and electricity supposed to be led into the house? The pipes must be frost-free from where to the house?

Currently we live in a big city in an apartment of similar size. I therefore have no concerns about privacy.

What do you understand by the parents’ privacy?

If he stays in bed because of diarrhea and she has visitors. Then you run past those visitors if you want to go to the toilet. Or you have visitors to watch football. The wife wants to do wellness in the meantime and walks into your party area. Such planning is avoided, you zone the space, for that a hallway is helpful. Or a visual separation. You want it to be better than in an apartment.

Why would you rotate the house?

Because a transverse wing crushes the plot and divides it into two parts.

I am open to alternative proposals. Would a niche for a built-in closet be useful?

Write down what the house needs and then plan accordingly.

So far the budget fits quite well for the house alone with the foundation slab.

I have to confess that I suspect a misunderstanding there. Already back in 2021 you came with expensive providers and mentioned something about turnkey for €250,000.
Schwörerhaus and Bien-Zenker do not offer including a foundation slab, the latter also likes to come with development stages.
In any case, someone claiming that all technology fits in one square meter seems suspicious to me.

I’m just surprised, otherwise here it is always pounded like a mantra that nothing works below €3,000/sqm,

Too hidden or not taken seriously.

Initially, I wanted to plan with 3 rooms. This was strictly advised against, as it is very disadvantageous for a possible resale (worst case).

I will only address this point. With the floor plan – access to the bedroom and children's room through the living room as well as access to the bathroom (from the bedroom) through the living and entrance area (great if you want to quickly go to the toilet at night) – you are probably excluding 90% or more of all interested parties. For a resale, truly catastrophic. Nobody wants to buy their home expensively like that. Maybe you want to live like that, but you are an absolute exception.