New construction of a solid house on an existing cellar

So Streif definitely builds on an existing basement. They demolished their house in Mannheim. The basement will remain as it looks and then a new one will be built on top.

And in general, this is a common method that is partially used here as well.

But tell me why the Streif Haus has to go? As far as I know, Streif does not belong to the very cheap segment, it should last easily 100 years as mentioned. Maybe contact Streif, perhaps they even have documents if you don’t have any.

We are currently facing a very similar project. In the first step, a structural engineer will now go through the house. After that, it will be decided whether we can build solidly or have to use timber frame construction. The latter is done by some house providers, but just as many do not. We have already checked out several. It's quite interesting how the statements range from "no problem if the static calculations fit" to "you can forget about it, it won't work."

We are currently facing a very similar project.

Did I clean my glasses poorly? - I just didn't see it in your thread history.

In the first step, a structural engineer will now go through the house. Afterwards, it will be decided whether we can build solidly or have to use timber frame construction.

That timber frame construction (real timber post construction is offered by none of the big names at least) being significantly lighter or having to be so is a popular belief that I (at least soberly) do not share. Some ideas, I suspect, can really only be developed at regulars' tables. We already had a thread on the topic, which I mentioned here in post #6: Also concerning the basement of the OP here, I see no reason to doubt the suitability for a modern house of any construction type.

Did I clean my glasses poorly? - I just didn't see it in your thread history.

The glasses work perfectly. There is no thread yet because there is nothing to report besides this statement.

That woodframe construction (real woodpost construction is not offered by any of the big names at least) being significantly lighter or having to be lighter is a popular belief that I (at least soberly) do not share.

Really? I've heard that a few times now, but only from prefabricated house providers from a professional perspective. Although they probably can't be neutral.

There is no thread yet because apart from this statement there is nothing else to report.

Showing your factual basis for the basement would alone be enough to report to dispel uncertainties.

I have heard that a few times now, but from a professional side only from prefab house providers. However, they probably cannot be neutral.

Hmm, whether they are even a "professional side" – they don’t necessarily know much about the other side of the comparison. And at this point, they live off folklore (and probably think “rightly so, it stays in the family” – after all, it is the same regulars’ table that so gladly calls their products cardboard houses).

@All Thank you all for the lively discussion participation.

First, the answer to the question asked, why the existing house has to go, even if it is an unsatisfactory one:
There are several reasons, which are more emotional in nature and therefore may not be understandable to some. For example, we are not willing to invest a six-figure sum in renovation. The house "feels" like it is made of cardboard. Everything creaks, you hear every step, the walls are thin. Additionally, we want to leave something behind for our family, which we have created, and thus enable a life with ONE less worry. I am aware of the naivety in this statement, but we will leave no stone unturned. In our opinion, financial independence begins with home ownership, that is what we want to create, and we are not convinced that the existing structure will still be "habitable" or meet our lofty goal in 30/40 years.

To make it short and also to cut off further off-topic discussion: The decision is final, as irrational as it may sound to some.

Thank you for the link. I will look at it right away. And yes – I should see that as the provider’s self-disqualification. Good approach! :D
Thanks for the hint. I hadn’t thought of Streif Haus itself yet, although we actually want to build solidly – again, such a subjective feeling matter. But that seems to be a real option :-)

@all Are there maybe any other ideas for companies in/around Berlin that you yourselves know do such things or where experience has shown that the provider also takes on "unconventional" projects, even if "unconventional" is probably a matter of interpretation!?

Best regards and many thanks for your commitment <3