On Wednesday we are looking for one of 10 plots - Sign?

Of course, in the event of insolvency, the services already performed on your property must also be paid for; the insolvency administrator will claim the consideration in such a case (simply put, if 70% of the house is completed, then 70% of the agreed sum must be paid). You essentially have the same situation as with the usual progress payments after construction milestones. If you were told otherwise, that is quite an outrage! Payment only upon handover of the keys merely provides a bit more motivation to deliver the house on time and without defects (non-essential defects (however that may be interpreted) that do not limit the usability of the house do not prevent the purchase price from becoming due and may be remedied after payment and move-in according to the contract terms).

The disadvantage is the full payment only upon handover of the keys, but on the other hand for the [Bereitstellungszinsen] of the bank, which must be paid on the entire loan amount if not completed on time. Furthermore, because of the late payment date, a long [bereitstellungszinsfreie Zeit] must be agreed upon from the outset, which means somewhat higher interest overall; you should keep that in mind as well.

So this is an important factor

I will have the purchase contract as well as the construction description checked by a lawyer or an expert? Or both? Do you have any experience?

I will have it reviewed.

I doubt that it has to be paid in the event of insolvency. Then their unique selling point (payment of the sum 100%) would only be void at the handover of the keys

You may certainly doubt that, but maybe you just trust the lawyer ;-) or alternatively ask someone who knows about insolvency law. You can't just assume to be allowed to keep 70% of the house without paying for it?

Ok thanks to you

I probably won't get around to having the matter checked anyway.

I'm probably well advised to consult a lawyer for the purchase contract and an expert for the construction description, right? Or does one person do both?

The range of the final amount is estimated; I will get the binding price in a few days. Including sampling without kitchen.

I already had a similar offer for 344,000 euros.
But the price is not relevant either. If the price is over 400,000, I won't build with them. Then they are simply too expensive.

You are welcome to doubt that, but maybe you just trust the lawyer ;-) or alternatively ask someone who knows about insolvency law. You can't just assume to keep 70% of the house without paying for it?

very good statement^^ many people think that with insolvency you don't have to do anything. The administrators are very aggressive when it comes to demanding money. and after all, a partial payment has also been made