So I can roughly expect around €10,000 in costs for the architect for a house with 170-180 m²?
And now think about how many hours of your precious free time you have to put into tenders, etc. Then set a realistic price for an hour of your free time (what else could you be doing with your wife/girlfriend/family). Multiply that by the hours... and then grab the Yellow Pages and find a contractor who will do it for you [emoji6] a bit ironic, but think about it.
And the architect is not a notary: it can always be cheaper, a maximum price is defined.
Sure, it will take me a lot of time and probably nerves as well. But honestly? I also enjoy it. I can occupy myself for hours and days even with the smallest purchase.
For me, that somehow belongs to it. I want to be able to say, this is my house, I built it. Simply having a turnkey house put up would never be an option for us.
There will certainly be days and possibly weeks when we are stressed and annoyed, but I gladly accept that.