Floor plan with setback - yes or no?!

The financing would be the first step. So not the financing itself, but a bank meeting to find out what kind of house you can afford.
Where do the 350,000 come from? Is that just pulled out of thin air?
The plot of land already exists.
Let’s take the 350,000 (with a lot of equity),
then subtract 30,000 for ancillary building costs, leaving 320,000.
At 2,000€/sqm you can build 150 sqm... let’s just keep 20,000 for the kitchen and so on.
Even if equity flows in... let’s just take the rough figure. Or, if you prefer, 160 sqm... garage and garden materials cost as well.

That explains a house with a ground floor and upper floor, whether single or two-story. No basement, no elaborate garage, no balconies, no converted attic.

Now distribute your room program over 160 sqm. This will not be created with a sketch, but through a list of what is needed:
Living room: 20 sqm
Living kitchen: 25 sqm
3 children’s rooms: 45 sqm
etc.

Only then will it make sense. You don’t need to submit anything else. Maybe include the attic as an estimate, but with a question mark whether it will be built.

Just to guess here, without looking at the budget issue:

You can’t simply make a room bigger without the upper floor “growing” along.

It can’t be seen like that. If you basically plan a house to later split it into two residential units and the ground floor unit remains for old age and then has about 80 sqm, then you should plan a guest WC in terms of separation, which leaves enough space for old age. An additional guest WC would then be silly regarding its use and in relation to the size of the apartment.

Your fallback (by the way, I know other similar U-shaped floor plans) is your least problem.

Wrong order
1. Financial framework
2. Floor plan

The financial framework determines what is possible and not the wishes

You stated 350,000, Ypg estimated 600,000 and she already considered a lot of personal contribution. If you were to build move-in ready it would be 600,000 + basement + garage + attic + incidental building costs which are high here due to the hillside location + outdoor area

If a child stays, for example, the TV area can be separated and converted into a bedroom
Without children you don’t need that much space

Split-level my parents-in-law have a real split-level house and curse it every day. They immediately said we shouldn’t build like this.
Your child is becoming mobile now. Do you want to watch for the next 2 years that it doesn’t accidentally fall down the stairs
With 30 the broken leg, later rheumatism, various age complaints

If I look at the side view, you are filling up quite a bit. How does it really run
I can’t read the height details properly

Floor plan you must definitely draw the right furniture in all rooms to scale

Expand later. You pay off debts, maintain the house, 3 kids, the money won’t increase

Regarding the floor plan
Basement entrance and cloakroom too small
What do you use the basement for

Ground floor
Pantry looks very narrow
Why a bathroom + another toilet
As Ypg pointed out where is the dining table

Upper floor
Stairs not on top of each other. Then you should try a different location
Again 1.5 bathrooms here
I would plan a normal sleeping floor with 2 children’s rooms and 1 parents’ room

Attic not to be expanded at all
You have rooms on every floor that you don’t use

We have two steps on the ground floor between the kitchen/dining area and the living room. I find it quite annoying and I’m already looking forward to not having that in the next house. It mainly bothers me when vacuuming/cleaning. I would reconsider whether the house should really be planned as a multi-family house. There is way too much uncertainty in that. Who knows what will happen in 20-25 years, where work or studies will take the children, whether they even want that, or whether you still want to live there. I think it’s not worth it.

Our two brothers, aged 25 and 30, still live at home, maybe that's more common in the countryside :eek

Can it be explained in a way that even a piefke can understand? It seems to me that the building structure turned out highly concentrated and multifaceted, similar to model railway houses where some details are exaggerated in scale or appear slightly overloaded in variety and density. And I share the concerns that the unrest (the floor plans do not seem to belong to the same house and the like) will actually require some financial input that you won't be able to see in the residential value afterwards. The design seems to me as if one had oriented oneself on three-hundred-year-old "grown" buildings from (also Swiss) alpine regions. A bit harshly said: almost like what the common ugly German tourist imagines the original native would live like. It only lacks that a wolpertinger comes out of the cuckoo clock

Do they end up on "Schwiegertochter gesucht"? At this age, you don't take such men as life partners anymore.... but that would be a topic for another forum Sorry for the off-topic... but with THAT perfect setup ... hehe