The question is whether and to what extent you can still opt out or involve another planner. Is it a freelance architect or the so-called draftsman of a construction company? We had a general contractor (GU) who did everything himself, and if he couldn't manage it with his planning software, then it simply didn't work; a complete chaos, unstructured, unreliable, and mostly casual in dealings. In the end, it still resulted in a nice house but with a lot of unnecessary hassle. For you, it doesn't have to be an absolute drama, but you should clearly assess the situation and not let yourselves be lulled. If necessary, it might cost some money, but that's less bad than living in botched work for decades. I really believe that you could also start here with a solid basis and, with the knowledge from the forum, arrive at a good plan that the house building company then implements for you. In fact, we probably made hundreds of detailed drawings ourselves to prevent the botched work of our GU as best as possible. The question would really be whether the "drafts" presented here are actually to be accepted as such as named in the contract, since even amateurs can clearly see fundamental planning errors here, for which you don’t need an expert to uncover them. He or a second architect knows that if you address it that clearly. Troubles usually arise during construction – don’t be discouraged, even if sometimes it feels like nothing is moving forward. Your requirements have not disappeared, and perhaps you will still let go of the mandatory staircase shape; it should be a nice staircase, but there are many possibilities for that. We also absolutely wanted a straight one and much else, but fortunately were eventually freed from such rigid specifications. Perhaps a serious conversation with the managing director or similar is also possible to achieve a change of the "architect."