Reliability of an energy calculation for KFW55, too high?

ok... but 25% more is not exactly little, is it? Where could such strong deviations come from, if you are only insulating to just reach 55 anyway.

Primary energy is subject to strong calculation factors: https://de.wikipedia.org/wiki/Primärenergiebedarf The building geometry also matters - our comparison value was, for example, 57.15 kWh/m²a. So, comparing these values across the board only works to a limited extent.

I am not familiar with the details. It was explicitly mentioned to us that the whole thing was calculated with the software "Hottgenroth Energieberater 18599".

All data see attachment.

Do you have the entire calculation available? What you posted is more or less just the result needed for the KfW. The entire calculation can already be 20-40 pages, where everything is listed, wall construction, roof construction etc.

23.4 kWh/m²a (?) - he has 31.6 kWh/m²a, that’s not that far off..

I find the difference quite significant per sqm. The differences can’t actually be that big. 25% more energy demand basically means you wouldn’t even get Kfw70 anymore (if that still existed). Probably a decimal point is misplaced somewhere. What I find sad about this is that the creator of these documents SHOULD IMMEDIATELY notice the 25% discrepancy compared to the normal Kfw55 calculation. You pay thousands of euros and the guy doesn’t even do a plausibility check. That such sloppy laziness cannot be stopped...

And now I come around the corner with 48 kWh/m²a and still have KFW55.

And now?

I am always missing the reference building here.