Small update:
In the meantime, an external appraiser has been commissioned by ING to examine the property value/construction costs. Tuesday was the scheduled decision date, then yesterday. Unfortunately, the appraisal is not yet available. Therefore, everything remains open. According to the Interhyp advisor, the appraisers usually confirm the value and thus the loan amount. Overall, the examination is now taking more than THREE weeks.
Unfortunately, I cannot submit the application to Sparkasse Brandenburg as long as ING refuses, because the KfW loan would also be blocked there. This cannot be done in parallel, and thus we are simply losing time. The current offer from Sparkasse expires on Monday.
At Sparkasse Berlin, I had several preliminary talks and had to submit quite a few documents. After initially being told that my wife's fixed-term contract was not a problem, I received a cancellation of the appointment one hour before the consultation because Sparkasse Berlin has generally not been granting loans to people with fixed-term contracts since January.