Whether it’s a corridor or not depends on the dimensions and circumstances. Three meters in the dining area don’t look corridor-like if there are patio doors on one wall. The cloakroom hallway is not difficult: 60 cm for the main coat closet, one meter for the passage. If that’s not the case, then you’re deceiving yourself and you should crumple up the paper. If you move away from the PC and don’t constantly work with programs that don’t take measurements, you obviously won’t see that. You don’t exactly get a feel for it just like that. A comfortable staircase should be at least one meter wide. Then the hallway has to be two meters. Plaster is also applied to the walls. And where does the railing go on a concrete staircase? What is the point of the concrete staircase here? The advantage of a wooden staircase is that it appears more transparent without risers, so you have more space. Concrete is massive, it’s a heavy lump. It would be more suitable for ’s proposal at the entrance, one-quarter turn. Or in completely different staircase layouts. You won’t get rid of this one anymore. One thing depends on the other. If you plan as a layperson, you should avoid bottlenecks. Three meters will rarely actually be three meters. This also applies to the garden, by the way. You don’t build so that you get stuck on all the corners and walls. For detailed plans, you should consult a professional. It’s also about feasibility – not least you can see which window front is from the layperson and which is from the professional (see your views in the original post and my attachment, where I fitted inexpensive 160 cm ones on your “Signus city villa”). And honestly: if you have the money to put a pool in your garden, you should also be able to shell out some cash for a professional.