We did several tenders per trade. Not only through the architect but also on our own. Only: if you think a heating system plus installation costs €15,000 and then you receive offers all over €25,000, you stand there not knowing what’s going on. Then the architect says: the heating installer X is way too expensive because he checked and compared it and... We then sit down, study the offers and find that one heating installer has various positions included that another one doesn’t, etc. We share this with the architect and he says: true. I saw it the same way... :confused: We read and understand every tender as well as our knowledge allows, also read books about building, call craftsmen, etc. Even today I cannot say how high the construction costs will ultimately be. Simply because I have no idea how much some works cost. KfW house or not... which plaster and why? Then 4 or 5 tenders come back and their amounts partly do not differ significantly. Worse are even the costs nobody tells you: rent for the box for construction power, sewer, filling, departure, costs of the municipality for closures, surveying, energy certificate, etc. Things like that an architect must know if he constantly builds. Why doesn’t he say that? Still my question: where does the responsibility of the architect begin? Can he really write any arbitrary sum X in the building application and if the client can no longer shoulder it, then tough luck and life for the architect simply goes on? Hansi