Two-story single-family house without a basement with an outbuilding and driveway to the south

Hello! Happy New Year to you all!
My husband and I recently purchased a plot of land and are currently busy planning what our house should look like. I have already read some forum posts and was able to take away some tips - many thanks for that already!
We are currently in the process of obtaining the first offers to roughly estimate whether we are completely off with our current planning or whether it will stay within limits or if we might even be able to plan a bit more generously. We tried to design compactly but still allowed ourselves some luxury - at least on paper. We would appreciate feedback on our plan - both positive and negative criticism is expressly welcome.

Development plan/restrictions
Size of the plot: 1000m2
Slope - no, flat plot
Floor area ratio - no restrictions
Plot ratio - no restrictions
Building window, building line and boundary - street side 3-5m, left and right each 3m, rear building boundary after about 30m, so sufficient space
Edge development - what does that mean? Open construction method is mandatory, neighbors are at least 3m from the plot boundary
Number of parking spaces - 2 cars
Number of floors - no requirements, we want 2 above-ground floors but no basement (high groundwater level)
Roof shape - pitched roof mandatory, our idea is shown in the elevations (maximum roof area facing south for photovoltaics), whether this makes sense cost-wise will be shown by the offers. Otherwise, it will be a classic gable roof, ridge parallel to the street
Style - Bauhaus or modern country house style (combination of plaster/wood appeals to us)
Orientation - garden in the northeast, street in the southwest
Maximum heights/limits: maximum building height at the building line 7m, maximum ridge height 8.5m
Further requirements

Builders’ requirements
Style, roof shape, building type: modern country house style, pitched roof, 2-storey without basement
Basement, floors: no basement, 2 floors
Number of people, ages: 4 people, 37 y, 33 y, 4 y, 1 y
Space requirements on ground floor, upper floor: GF: living-dining-kitchen, home office/guest room, bathroom, technical room, wardrobe; UF: 3 bedrooms, bathroom, utility/storage room
Office: family use or home office?: home office twice a week, sleeping accommodation for parents-in-law
Overnight guests per year: 3-4 weeks per year
Open or closed architecture: living areas on the ground floor open but preferably with the option to install a sliding door later when the children are older and visitors are invited and some privacy is desired
Conservative or modern construction: open to both
Open kitchen, kitchen island: definitely open to the dining room, a kitchen island would be my wish but unfortunately requires a lot of space... will probably be more of a peninsula
Number of dining seats: 4 people, but there should be space for up to 15 people for celebrations such as Christmas, birthdays - it is sufficient if another large table is simply added in the living room then and the couch moved for the time being
Fireplace - YES
Music/stereo wall - not a must
Balcony, roof terrace - no
Garage, carport - yes, carport in the front building setback. Behind it a garage as a basement replacement room as well as a room for a sauna (alternatively, a sauna in the main building would also be fine but we were not able to plan that, the sauna should have minimum dimensions of 2m x 2m)
Utility garden, greenhouse - no greenhouse but a few fruit trees are already on the plot, we want to add native perennials and small vegetable beds which should be cultivated together with the children
Further wishes/special features/daily routine, gladly also reasons why this or that should or should not be: we wish at least one living room to have a view into the garden - i.e. north, therefore the living rooms are arranged in an L-shape. The other two living rooms should be oriented toward the street (south). This is a very little trafficked street and currently still a nice undeveloped view (cultivated by the farmer). The WC on the upper floor should be a separate room. As much afternoon sun in the living areas as possible would be desirable (a corresponding sun protection for the heat period is planned)

House design
Who planned it:
- Do-it-Yourself
What do you like most? Why? What I like best is our plot because it is so quiet and we are already looking forward to sleeping with open windows in summer. I like the large bathroom compared to our current one, where you (hopefully) can pass each other when brushing teeth and also still have space for a laundry hamper. The kitchen next to the dining area is also very important to us. We don’t have that at the moment, and it is sometimes a challenge with the children.
What do you dislike? Why? The entrance area, I am not sure if there will be enough space here for our clothes, also a direct access from the garage into the house might be practical... I also worry that the long corridor between the buildings will be too dark
Price estimate according to architect/planner: we are currently waiting for that
Personal price limit for the house, including equipment: €600,000, but we would rather land around €500,000
Preferred heating technology: geothermal (deep drilling or ring trench collector)

If you have to do without, which details/extensions
-you can do without: lift-and-slide door (a hinged door is also ok), straight staircase, kitchen island, staircase from living room to upper floor
-you cannot do without: guest room, garden view from one living room, bathroom on the ground floor, separate WC on the upper floor

Why is the design the way it is now?
We carried out a needs analysis and arranged the rooms according to the cardinal directions (lighting is an important topic for me, lighting will be a topic later) and after many pencil drawings and paper furniture rearrangements, this design finally emerged. It is the first one that was not completely redesigned by me again after just a few days. I am curious if it will stay that way :D

Welcome! Your draft is interesting but I have to ask you: Do you really want to run through the lounge area every time with coffee, cups, and plates to get to the terrace? The terrace + garden is the homeowner's living room in the summer. I understand your "light" dilemma due to the somewhat unfortunate northeast orientation. But maybe there is an even more elegant solution?

I quite like the arrangement and it fits with your considerations. Of course, the straight staircase takes up a lot of usable traffic area, which makes the construction somewhat more expensive in relation to the actually usable living space. The construction costs per sqm estimated in the forum will tell you more about this; I am not up to date on that, so this is just a general hint.

The hallway to the front door is naturally a bit darker. Too dark? Certainly not. When the sun is gone, a light simply shines. Maybe you can even go the other way and let a vine grow over it, then it becomes a sheltered entrance cave. I would be more concerned that the living rooms become too dark - I see no light on the long wall facing southeast. I would also allow myself some morning sun in the bedroom.

Do you really want to run every time with coffee, cups, and plates through the chill-out area to get to the terrace?

Yes, the other way is quite long - and if the children go to the northeast terrace, even much longer. I would counter this with another terrace in front of the kitchen. I am anyway a fan of many places to sit comfortably on the property.

Welcome! Your draft is interesting but I have to ask you: Do you really want to run through the chill-out corner every time with coffee, cups and plates to get to the terrace? The terrace + garden is the living room of the homeowner in summer. I understand your "light" dilemma because of the somewhat unfortunate northeast orientation. But maybe there is a more elegant solution?

Wow, thanks for the quick feedback! Yes, I completely agree with you, that will certainly annoy me... but unfortunately I haven't found a more elegant solution yet. Somehow the kitchen measurements never really fit well. We have it like this at the moment as well, so at least it won't be a deterioration :D at least I have a shorter way from the front door to the kitchen for groceries and the proximity to the bathroom because of the pipes. Ideally, we will have 2 terraces. A small one in the south where you might still be able to sit in the transitional season - I can then go directly out from the kitchen. But I'm open to suggestions, maybe I just handled it clumsily...

The bathroom on the upper floor is supposed to be a separate room

That's what I'm looking for right now. Do you mean the children's bathroom? By "separate WC" I understand that the toilet is separated. But okay.. The shower is more like a foot bath, that small?!

On the one hand, I think it's good that you also organize the front part of the property a bit. Also that the children's rooms get the sunny side. But now comes the but, and I'll start at the front: The different state building regulations are similar yet different. Still, I don't know of any state building code that allows more than 12 meters of boundary development on one side.

Boundary development - what is meant by that?

The question means how much boundary development is allowed where. Usually, it's 9 meters on one side, maximum 15. What you have drawn there is bigger than 12 meters. Also, I believe a sauna is considered a living room, and if not, it is not allowed to plan and build a room with a combustion appliance as boundary development. So at least the sauna is out there where it is. Storage probably too. Regarding the design: I consider the technical room too small. Since WC and technical room follow their position, I would arrange the technical room with a short line to the street, the WC towards the garden because of the sauna in the garden. You want a view, you want sun. Both rightfully so. But I completely agree with Katja: kitchen at the main terrace and vegetable garden. The vegetable garden wants half shade, so not south. Ask yourselves when in which months you use the living room or the sofa: during the dark season you only have the sun during the day on weekends. In summer you want the garden all day. Is the living room right where it is? With the divided living room: do you want to take away the use of the fireplace in the evening by locking him out? I'll just say: the staircase is wrongly placed for a household with children. The 80?s doors catch my eye (sorry! Everything a bit pixelated). They should be extended to 100. Guest WC and children's bathroom can stay. There is no wardrobe. As a reader of some threads, you should know the usefulness. 24sqm hallway only on the upper floor dries out the mouth. I can't deal with the roof at all. From the street it looks like half a house.

I like the idea with the entrance, also because with little effort you can find nice solutions to design this area; the adjoining extension with the sauna is successful, but this could also be placed somewhere else on the property without any real additional costs.
It is supposed to be a carport probably made of wood, and there are design options to allow more light, so that the entrance area does not become too dark.
I would carefully check the rather small technical room regarding the necessary equipment; I also find it sensible to store at least a few small items (tools etc.) in there.
The hallway is, partly because of the straight staircase, a long tunnel, which I mostly do not like, and I miss natural light there. The foyer certainly takes up space, but currently offers hardly any room for coats, shoes, etc.
Whether a fireplace makes sense alongside underfloor heating I see rather critically; in this respect, I would rather opt for a large window area; in fact, I find the window surfaces rather sparsely distributed, considering the specific requirement.
The living room only really begins after the beam; therefore, I find the planned area quite tight; I would also be interested in the specifically drawn and actual furnishing there.
I would actually question the shape of the staircase, which strongly influences the living rooms behind it, if not to say disadvantages them.
The stairwell/hallway could also be rather dark on the upper floor.