Floor plan single-family house ~165m² plus basement

That the general contractor does not offer the planning contract independently has, I put it simply, "trade law" reasons and thereby indicates that he would also commission a freelance architect just as you can do yourself (which in my opinion is also the royal road). I would only take the general contractor if your trust in him is shared by your architect. In case you haven’t read my Phase-5 mantra yet, I will gladly repeat it here once more: with the drawing attachments of the building application from service phase 4 one is only allowed to build the house, but one cannot yet do so. Waiving service phase 5 is bitterly regretted on the one hand with stigmas in the form of drywall cladding of all sorts of piping innards, and also with additional effort in service phase 8.

I do not "like" the cantilevering of the bay window at all: botched (as shown in the plan) you will have little joy with it, and if properly executed, you save – if at all – here only a few hundred compared to already designing the bay window in the basement. The apparently cheaper variant is more complex in this special case.

Where did the floor plan shown here at the front come from? (it is teeming with dimensions that indicate very special building materials or a non-masonry construction). The best buildings with what I would call a "planning-involved general contractor" (especially if you consider omitting service phases 6 and 7) are created with the smallest possible variation of one of their standard construction proposals; second best are then consistent individual plans; and almost guaranteed botched is to change a standard construction proposal of the general contractor significantly (and moreover dimensions): in such cases, the "We-always-do-it-this-way" method leads to the greatest deviations between target and actual.

The floor plan was created by a sales employee of a prefabricated house company. Therefore, it is not perfect

I had read "Der Hausbau-Fahrplan" by you. I never wanted to give up phase 5 of the services, at least not consciously. Thanks for the tip that the architect can be a freelance architect; I will try to check that.

Well, whether the stairwell window there is really that practical. You stand on the landing at about 1.65m.
Then there’s nothing left at that height. Or is the view just drawn incorrectly?
And in the bedroom, first try to draw in your bed and then a wardrobe.
Maybe then the gable window in that room will have to disappear.

Just my opinion

I just wanted to understand how this floor plan came to your mind and why it doesn’t have classic solid house dimensions. Qualitatively, it has a passable apprentice-level drawing quality, which is quite remarkable for a salesperson (last year some of them were still selling savings plans or aloe vera, but this one apparently has been dealing in houses for a while).

I’m glad you read it – by the way, the last part was published recently. My information offers have moved (to bauen-jetzt). The general contractors often have the “small plan submission authorization” as masons or master carpenters, which is not sufficient for all their construction projects. Having their own employed architect doesn’t pay off for them either, so there are often some permanent deals with architects on parental leave or retired. The service phases beyond the approval stamp typically focus on reinforcement plans for general contractors. The service phases build on each other like floors, so without detailed planning, ultimately even the construction management is partly built on sand.

Both stairwell windows. If the view is correct, all windows have the same top edge. If your clear height is 2.50 and the roller shutter box is assumed to be 25cm, the window would be OK at 2.25m. On the stair landing, after 8 risers, you stand at about 1.48m. With a parapet height sensibly at 90cm, you would be at 2.38m window bottom edge. You can see, that can’t fit. [...] However, if a loft ladder is planned in the upstairs hallway,

A general contractor had a finished standard floor plan that I liked very much, [...] Besides, I feel better taken care of by the local providers.