Single-family house 130-140 m² floor plan planning

...lead the stairs up to the attic and set up a small office there. The attic could be finished with own work to keep the budget lower. Additional storage space could be created under the stairs on the ground floor.

I would also find the roof as a development option in EL for the office good.
Here is the 35° variant with 1.50m cut out:
[ATTACH alt="950DG.jpg" type="full"]40170[/ATTACH]
[ATTACH alt="950Ansicht.jpg" type="full"]40169[/ATTACH]

Let's take a look at the budget in the questionnaire ... ah, not filled out.

I deliberately did not fill in the budget because then everyone would start yelling that it won’t work anyway. It is set at 255k EUR including incidental construction costs. I found a better floor plan. The requirement is that the stairs fit within 2x2 meters

I recently saw a floor plan with 950x950 that I quite liked.

Finally, something reasonable: most Ersatzvillen Model edge length 950 shy away from area-appropriate stair shapes like the devil shuns holy water.

There is no office there, though.

There is never an office there - only a leftover space that is relatively often called "office" or "guest." Bismarck is said to have remarked that it is good that people do not know exactly how sausages and laws are made - this can quite well be applied to urban villa floor plans as well: 1. you take an area (90 sqm) and extract the root > 2. you get the edge length (950) > 3. then you place the garden side at the top of the plan, aligning the living room with it, and the street side at the bottom > 4. now - because the common Ballermann tourist equates aesthetics with symmetry - you put a straight, single-flight staircase in the middle > 5. the leftover space is called either office or guest room > 6. you put the model in a "3D" drawing on an infinite meadow, and a popular company car model next to it; further decoration is a pretty young wife admiring the proud builder. DONE!

I found a better floor plan.

In my opinion, you do not need just the floor plan for your procedural model. It seems to me that you imagine looking for a shell contractor with a floor plan stolen somewhere from the internet, which you then tack on to the building application. But that does not work like that, because for a build with largely avoided complications, the builder and a design he has presented many times are a bundle that cannot be unraveled so easily. So, your motto "the design must cost nothing" includes first making a selection - and in my view most recommendably among a maximum of half a dozen solid builders from your or an adjacent district.

I found a better floor plan. Provided the staircase fits within 2x2 meters

You are aware that your living area hardly gets any sun all year round? With a northeast orientation, you might sometimes catch a hint of the sun rising in the east, but that’s not possible if there is a garage in between.

If the garage stays there (but also if it could be moved), I would at least rotate the floor plan 90 degrees counterclockwise, so that the front door ends up next to the garage door. Then both children's rooms would get more sun. They live in there and need daylight. Children’s rooms with a north-facing orientation should be avoided if at all possible. The kitchen would also get a lot more daylight with southwest-facing windows.

If it were possible—I don’t know the development and view of the neighboring properties—I would even rotate the ground floor 180 degrees toward the sun, but that would require redesigning the entrance situation and thus at least the adjacent rooms as well.

Please address the questions, suggestions, and ideas that are now spread over 5 pages here. Some people are stuck because they are waiting for your response. You have to answer if you want to take something from this discussion... [Discussion... where is it?].

Please address the questions, suggestions, and ideas that have now been spread out over 5 pages here.
Some people are stuck because they are waiting for your response.
You have to stand up and answer if you want to take something from this discussion... (discussion... where is it?)

I have already addressed this and have now made a draft with a winding staircase. There, as someone wrote, I also have more space for the wardrobe and for receiving guests.

Personally, I would prefer to orient my living spaces toward the sun. Northeast is rather unfavorable. Are there reasons why you did not do this, e.g., view or visibility?

I understand the problem with sun orientation as well. The reason we have currently chosen it this way is because there is a main road running past the garage side. The house and the garage should shield the noise from the garden and the living rooms, which are then located between the kitchen and garage. Although we will install a ventilation system and will generally keep the windows closed.
See Lage.png

In my opinion, for your procedural model you need not only the floor plan. It seems to me you imagine that you can find a shell contractor somewhere on the internet with a floor plan you have copied, and have him tack this floor plan onto the building application. But it does not work like that, because for a building with largely avoided complications, the contractor and a design he has already built many times are a bundle that cannot easily be untangled.
So to your motto "the design must cost nothing" belongs first to make the selection – in my view, most recommended between a maximum of a handful of solid builders from your or an adjacent district.

That is also not my expectation. However, the architect’s effort is reduced insofar as he does not have to start with a blank sheet of paper.
I am still surveying, but currently I have an offer for €4,500 gross for service phases 1 to 4.
For cost reasons, I am moving away from a general contractor. The shell house is not worthwhile due to the high prices. With our requirements, I am at €180k for shell construction, roof, and windows. No one offers without windows and doors here, although I would prefer to have these installed by my brother-in-law. By acquiring the doors and windows myself, I also expect savings.

I already see savings in the building services that I will do myself because I trained in this profession. There alone the savings on material costs are 50% if I buy the components online. (Panasonic LW heat pump: €2,500)

Please note that we are building in Saarland, where everything is somewhat cheaper anyway.

The other proposals unfortunately did not meet the requirements for the number of rooms.