Hello again. Yesterday the acknowledgment of receipt from the building authority arrived, now it can surely only be a matter of months until it continues... I have received a first offer from a structural engineer for the statics and reinforcement, and the non-binding proposal amounts to a hefty 3500 euros. Yes, the hillside location and the 2 openings also need to be calculated, but it seems a bit much to me. Or is that a fair price? Then already 7000 would be gone before even a single hand has been raised. Maybe I should give up on organizing everything myself and find a small developer who has the time and desire to do everything?