The construction company gave us the tip to arrange multiple financings. Their example:
50,000€ (or what you put into the installment) over 10 years (back then about 1% interest) in full repayment
50,000 KfW over 10 years in full repayment
Remaining amount over as long as possible (e.g., 20 years) with 0% repayment and interest only
After 10 years, then increase the long-term loan and start there
Advantages:
- KfW is off the table, no refinancing of the small amounts (usually about ~~~30,000 after 10 years)
- You have part of the financing at a super low interest rate off the table, without the short fixed interest period being relevant (basically it would be another "KfW financing")
Of course, this only works if you conclude everything with one bank. The construction company said that you could do it at Haspa Hamburg. We didn’t follow up because we forgot in the hustle and bustle. It is definitely a calculation idea!
If the 0% financing is not possible or only possible at a high cost, reduce the amount of the quick financing and set the large loan to 1% repayment. However, the actual effect is lost then. The more money in the small quick loan, the cheaper it ends up being (and the higher the installment).