You don’t understand at all what we want to say. Someone has drilled into you that your house measuring 16.80m x 9.50m costs sum X. You hold on so tightly to that that you completely lose sight of which rooms you need in what size, where they are conveniently located, how everyday life works, whether you have an inviting entrance area, and so on. Everything is subordinated to the dimensions just to keep sum X.
(A) builder laughs his head off because the amounts involved are comparatively tiny when you “fall out of the mold.” It is completely disproportionate to limit yourself so much when, for example, you could simply build a porch and include the guest WC and a nice wardrobe there instead of these contortions. It’s “not worth it,” do you understand? It doesn’t matter whether the house costs 300K or 303K if an enormous gain in quality of life results from it.
Of course, I don’t know the offer. Was it Town & Country? Did he say that the dimensions are crucial to keep the price? Why? What exactly is so crucial about that?
You also have to understand us. We see how you struggle and don’t know the reason for it. In the end, someone is ripping you off big time by telling you stories about additional costs that are completely unrealistic.