Passive house as a logical consequence? Are there counterarguments?

Price increases due to the Energy Saving Ordinance: a whopping 49%!!!

That is certainly severe. Interesting to hear a real calculation for once. Can you say something about what caused particularly high costs? Or were you just told the final number?
A somewhat older breakdown that I have now found had the largest additional item as planning that was €40k more expensive.

Could the different figures actually come from the difference between a stone house and a wooden house?

That could be.

We were only given the total amount, massive construction. Wood would also be possible. I didn’t follow up any further. To be honest, I was a bit shocked by the amount. I hadn’t imagined it to be that expensive.

We were told that such a house needs to be planned very carefully. Additional costs are not excluded. But we all already knew that.

I just found a construction blog where someone built a PH with Kampa. There was a surcharge of 100€/sqm. But it's not really comparable because Kampa already builds Kfw40 as standard. Unfortunately, most PH construction blogs do not list prices.

You should have an offer made for you on site. Only in this way will you get clarity about your costs.

For us, the topic is already settled anyway; for the OP, that certainly applies.

According to which standard do you build or have built? Or bought?