Payment plan with 35% after the shell construction, okay?

Thank you for your responses. I will then try to have a conversation with the GU. I hope something can be done about it. The company actually has a very good reputation in our area and also builds several houses per year.

Thanks for your answers. I will try to have a conversation with the general contractor. I hope something can be done. The company actually has a very good reputation around here and builds several houses each year.

That means nothing! He can, for example, delay the costs, practically paying for the completion of an old construction site with your money, etc. Just be reasonable, because you are spending a lot of money.

So for the shell construction, our general contractor wanted a little less, but the final installment would have been only 1%. 3% is average, 5% great, more I consider unrealistic.

The rate for the shell construction is, as already explained, much too high. I just don't understand the discussions about the final payment.. 1%, 3%, 5% completely irrelevant if it is not specified which services correspond to it.

At the final acceptance, defects that have not yet been discovered will most likely not be discovered either.
Much better is an inspection with an expert at relevant intermediate steps (e.g. base slab before pouring, roof structure, etc...) Here defects can already be indicated and withholdings made if necessary.
This is at least as important as a balanced payment plan.

We already had a similar thread here. Check the Building Code, everything is clearly stated there and regulated under the term "Werkvertrag." Basically, the BU may charge as much as the increase in value of the construction project. Your figures are definitely well beyond that. Unfortunately, in reality, it often looks different, and there is usually little room for negotiation. I would just recommend caution and rather change the developer again...