How much additional cost according to the structural engineer's calculation?

If you want to stick to the contract, I would really make sure to get someone on board who knows what they're doing.

And under no circumstances waive my special right of termination.

With such business practices, I cannot consider the construction company to be reputable.

So, I honestly don’t understand the concept of the company HDH. There is also a very old post from 2009 in this forum if you google for experiences.

Usually there’s a reason why they seem cheaper than Heinz von Heiden or Massa Haus.

That’s true. Massa Haus and Heinz von Heiden are already among the cheapest in the nationwide turnkey segment. Much is only on the builder’s side in the construction service description. Meaning: not included in the price, the builder must still pay for it or commission it themselves.

Then the house suddenly becomes more expensive after the static calculation. Why?

No, it’s the black tank.

I think the basement is an extra item in the house offer, ? How much does the basement cost in the offer?

The basement costs 50,000 euros.

Best regards

The cellar costs 50,000 euros.

lg

How is it sealed according to the contract and is it made of concrete? Is a plan part of the contract?

No, it is the black tub.

I understood the OP to mean that they once had a buffer that goes towards the black tub, and the site manager now said that after the static calculation, another ominous surcharge is supposed to come.

I understood the OP to mean that they once had a buffer that would cover the black bathtub, and that the site manager has now said that after the static calculations, a mysterious additional charge will come.

You may be right with that.

The basement costs 50000 euros. Regards

For how many square meters? A proper storage basement or for residential use?