When taking out a home loan, the standard security value of a home is 75 % of its value. For remaining part (10 % at maximum or 20 % at maximum for first-time home buyers) you can take out an OwnGuarantee, for example. In addition, you will need your own savings or other security for the remainder.

If you, as the borrower, cannot repay your housing loan and the selling price of the home pledged as security does not suffice to cover the remaining housing loan, an insurance company will pay the bank compensation amounting, at most, to the size of the OwnGuarantee purchased. 

The insurance company, however, has the right to collect the compensation it has paid to the bank from the borrower.