Construction costs are currently skyrocketing

Good day, may I ask a question?

energetic quality of the building envelope ht

What values do your houses have there?

And how good or bad is:

0.34 - Construction according to [Energieeinsparverordnung] with 36.5cm aerated concrete from 2020.

Primary energy 12kWh, final energy 7kWh.

We have 48 kWh/m²/a.
36.5 thermal standard from Ytong, above the base slab "only" 8.5cm polystyrene WLG035 and towards the roof 20cm mineral wool WLG035, windows Ug 0.7.
Nothing special then. An upgrade to 42cm thermal standard or the better insulating brick Thermsuper in 36.5 would have brought us to 43 kWh/m²/a...

You are wrong there. But it is still quite a way from KfW55 or KfW40(+).

So the building envelope is rather poor or bad?

0.34 - Construction according to the Energy Saving Ordinance with 36.5 cm aerated concrete from 2020. Primary energy 12 kWh, final energy 7 kWh.

Comedy? 0.34 W/m²K and 12 kWh/m²/a do not match at all.

So the building envelope is rather bad or poor?

the question is: in relation to what?