Who is responsible for the planning: -Do-it-Yourself [...]
I created the floor plan myself based on model houses.
To get a professional opinion, I have already been in talks with a construction company.
The planner drew up a plan for me, which I did not like. At the next appointment, I showed him my proposal, which he also quite liked. We discussed some corrections and thus the first draft was found. [ / ]
I will collect some offers. They will probably bring me back down to earth, and then compromises will have to be made.
It is immediately obvious that this is an amateur plan. My spontaneous first impression was: someone is planning who doesn't care whether the figure is "Schilling" or "Dollar". If, on top of that, model houses are thrown into the blender, the result will be even more off in terms of size and therefore price. Add a roof from the ladies' menu, and the ground of reality needs to be whipped up as fluffy as possible. "Professional opinions" from construction companies are limited to encouragement for everything the customer can afford. And the draftsmen gladly elicit counterproposals from the customers – so far, no surprise.
The planner drew it like this; I just adopted it. I think he did not draw the basement in detail because it is a prefabricated building company and I only requested the ground floor. [...] The roof is only like this in my draft. The planner had drawn a shed roof although we would like a gable roof.
Especially if the basement is not even supposed to be part of his assignment, the "planner" naturally doesn’t put any love into it, but is only interested in it to the necessary extent. Whoever is forced to have a basement by a hillside location should also use it (unless, of course, money is no object). For example, I also consider the second office suitable to be accommodated there in this basement (which, thanks to the cellar, does not have to spare space from the terrace). I would probably suggest a gable roof or a staggered shed roof here, which – also in the manner of a pergola – covers the terrace. What I find least understandable is why only the garden-side view is being used here, but not the valley view. (Did) I miss a north arrow?