Floor plan design for a 135 sqm single-family house - ideas and advice wanted

The storage room would be on the west and not on the south. So that should work?

Is the floor plan in any way NOT aligned to the north, i.e. not matching the site plan?

On the eaves side we would have windows that face the neighbor's side.

Do you mean the ones on the ground floor?

So we would be able to look out onto the neighbors and their garden or watch them if there is a barbecue party (exaggeratedly expressed).

Being able to do something and actually doing it are two different things in the neighborhood. Maybe for you only terraced houses are arranged "unproblematically"? Otherwise, one tends to prefer NOT being able to do it through skillful garden fencing ;) If you pay more attention to the exceptional case than to everyday life, you will not have lasting joy, because the house usually does not work in everyday life.

Is the floor plan in any way NOT oriented to north, that is, not matching the site plan?

Do you mean the one on the ground floor?

Ability and action are two different things in the neighborhood. Maybe only terraced houses are arranged "unproblematically" in your case? Otherwise, one tends to favor the inability to act through skillful garden fencing ;) If you give more concern to the individual case than to everyday life, then you will have no lasting joy because the house usually does not work in daily life.

Sorry for the confusion. The floor plan is not oriented to north. I would have to adjust that again. My mistake. According to the floor plan, the bedroom, storage room, and one child's room face west. And regarding windows on the eaves side, I didn’t mean on the ground floor, but on the upper floor / attic. Hence the statement that you could "observe" and hear the neighbors from the bedroom. That’s why the question whether the eaves side facing the neighboring house is the ideal orientation. But we probably have to discuss that ourselves (together with the architect).

Guest room later as a bedroom with double bed and wardrobe does not work.

Very simple:
Bunk bed and later with a hoist for the one sleeping on top...

To say it again, clearly and in German: 135sqm is a small house – just subtract the traffic areas, and then you see how few sqm remain for rooms... there is little room left for a wish concert; you can't make a usable 2-family house out of it either; and the 'big' kids with their own living unit... : seriously: how many years do you think that will be used like that? 3 - 5 at most! And then you want to squeeze yourself downstairs into an undersized bedroom without enough closet space with a mini shower bath? The children will still be using the house stairs...

I am also in favor of planning a house as flexibly as possible... but this house definitely does not allow that.

To say it again clearly in German: 135 sqm is a small house – just subtract the traffic areas, then you see how few sqm are left for rooms... there is little room for a wish list; you can't make a usable two-family house out of it; and the 'big' kids with their own living unit... seriously: how many years do you think that will be used like that? 3–5 at most! And then you want to squeeze yourselves downstairs into too small a bedroom without sufficient closet space with a mini shower bathroom? The kids will still be using the house stairs...

I am also in favor of planning a house as flexibly as possible... but this house definitely does not allow that.

Hello, 135 sqm refers to the actual living area. According to DIN it is about 150 sqm. Of course, it can always be bigger. It is also a question of the budget. I already wrote yesterday that we will relocate the shower bathroom so that the guest room on the ground floor gets a reasonable size (about 14 sqm). I think that should be sufficient for a bed and wardrobe / dresser. Thank you for your perspective.

I can understand your thought processes regarding current and future use very well. Try to incorporate the timeline of your thoughts into the planning. This way, you can design the house exactly as you need it now and prepare it to be adaptable for later needs (pipes, load-bearing walls, underfloor heating loops...). In this way, you create more space for now AND AT THE SAME TIME flexibility for later.

I find the idea of providing grill guests with a place to shower quite imaginative. At our barbecue gatherings, the guest contamination level is still manageable. Apparently, part of the barbecue folklore is unfamiliar to me. :D I think it’s good to integrate exactly such individual ideas into the planning.

The furnishing will be quite expensive because with standard furniture there will be some tight spots in your house. Additionally, it will be necessary that the furniture going to the upper floor is not too large because the transport is structurally limited. Box spring bed for the parents is already out... The positioning of the door in the bedroom makes placing a wardrobe in this room size unnecessarily complex.

I think it’s very good that the children will have plenty of space.

The arrangement of the utility room is – if you want to look at it positively – beneficial for fitness because the laundry logistics are linked to a middle-distance run.

I would omit the wall corner from the hallway to the kitchen and living room. Surely, this will make it a bit noisier on the upper floor and increase heating effort (partial solution through a windbreaker in front of the front door?), but this trick creates a hint of spatial generosity and at the same time shrinks the middle-distance run to the utility room into a short distance.