Calculation of property value in new construction

Here is a first report from the banking front.

Yesterday we were at the Sächsische Aufbaubank (SAB).
There, 20% equity is mandatory.
However, they summed up all costs except for financing costs and then compared the equity against that.
So the 20% was of course easily achievable.

Different results were obtained from the intermediary. Depending on the bank/insurance company, certain costs were apparently not included in the property value.