Construction costs are currently skyrocketing

But then there's a WU reinforced concrete basement involved, right???
30 tons is quite a lot, that will be like a bunker :D

In a "normal" single-family house with a slab foundation, there's only max 5-8 tons of steel
With a WU basement, maybe the same amount again

one has to clearly distinguish here between price with labor and without. With processing, the m3 concrete quickly costs gross 170-200€ someone can write what the current prices are with the general contractor for ready-laid concrete. I suspect back then reinforcement steel cost 0.5€/kg net in purchase

Completely correct; unfortunately, it is not broken down differently. I would be interested in the current prices at the general contractor for ready-laid reinforcing steel

We were informed by phone yesterday of €3.20/kg. A year ago, we paid 57 euros for 60 kg of construction steel mats. Now we pay 96 euros for 30 kilos. Thank God it's only for a garage ceiling.

But with your smaller quantities, you also do not meet the prices for the single-family house