I don’t understand one thing about this matter. The architect obtains bids and thus prices – the one that corresponds most closely is chosen => i.e. I have the price for heating, shell construction, etc. etc. here and there, some changes are clear. What I don’t get is – how can there even be such extreme deviations from the conveyed budget (unless the builder knowingly SUDDENLY wants much higher-quality floors, fittings, whatever, then it’s his own fault. But without this variable, it simply can’t be that a 350,000 estimate suddenly becomes 450,000, that is just incomprehensible to me. I also wouldn’t go into a tile store, get a price for one tile and then have the tile cost twice as much – no one would put up with that – somehow I always think architect = free rein :) The basement should be included in the house... the 11k are: Excavation for basement or slab 6,000.00 € Earth removal 5,000.00 € only excavation and removal, no basement itself I just can’t believe that it’s not possible to build a house within the budget... I get the impression that nothing under 500,000 works (purely the property) and I really can’t believe that... especially when I assume a meager 140m². I’m not talking about luxury but higher standard, sure I can install flooring for 300€/m² or for 80....