which energy standard is being built

Same with us, as maybe [KFW55] will be reached. Our architect, paid by me, received checkpoints from the energy consultant which he (anyway) must pay attention to. Then there is the confirmation at the end. But that also applied before with 55 or better.

I hope I am now in the right topic

we were at a lecture about "energetisches Bauen" yesterday I was told yesterday that now for Kfw 70 as well as KFW 55 an energy companion must supervise the construction and also finally approve it. That was apparently different until now.

I hope I am now in the right topic

We were at a lecture about "energy-efficient building" yesterday. I was told yesterday that now even for KFW 70 and KFW 55, an energy consultant must supervise the construction and also do the final acceptance. Apparently, this was different until now.

I believe this was clarified exactly like this here.

I am commenting on the question posed at the beginning of the thread:

We built extensively in 2014 and chose the KfW70 standard. The effort for this was relatively low; further measures would never have been cost-effective for us in relation to the savings (energy/interest rates). So now we have a well-insulated house at a reasonable price.
As a heating system, we decided against the much-hyped air-to-water heat pump* and installed a conventional gas heating system. In addition, we have vacuum tube collectors on the roof as the primary energy source for heating and hot water; they are so effective that even in winter with overcast skies they almost manage to heat the water on their own.
All in all, we therefore chose what I consider the best price-performance ratio. Let’s see what costs we will have after the first full year.

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*All the reasons against it would be beyond the scope here, and it is not the topic anyway.

I think this was clarified exactly like that here.

ok then I wasn't completely wrong

ok then I wasn’t completely wrong

No, on the contrary. Your info was correct.