Responsibility of the architect in case of KfW interest and further matters

You are calculating incorrectly. For a single-family house, fee zone 3 and the middle rate are chosen. A 5% flat rate for incidental costs is also common.

I have not seen a conversion surcharge.

But what is it about now? If the fee is too low, should one then expect not to be properly cared for? I don’t quite understand right now what this is all supposed to lead to.

I haven't seen a renovation surcharge. But what is it about now? If the fee is too low, should one then expect not to be properly looked after? I don't quite understand what this is all supposed to lead to.

That's exactly how it is. No one works at 100% if they only earn 50%.

But we didn’t negotiate or anything there. We said what we needed and then received the offer.

Well, maybe he wanted to do you a favor. Our architect made it clear that for the price we paid, we cannot expect all services according to [HOAI]. So within the respective service phase.

That was okay for us.

Yes, well, but that should have been communicated as well, shouldn't it? So you can't really say now that in the end anything goes because he isn't being paid sufficiently?