Financing with 2 building savings contracts 2.95% interest fixed for 30 years

Combo... which loan has which interest rate then?

Let's see if I understood you correctly:

Your bank suggested:
- to conclude a pre-financing loan amounting to 150,830 euros with a 10-year fixed interest rate, due at the end (only interest is payable)
- in addition, one or two building savings contracts (total building savings contract sum 150,830 euros) should be concluded, which are supposed to repay the above-mentioned loan after 10 years
- thereafter, the building savings loan should be repaid by you with a term of 20 years
- the installment should be about 750 euros per month over the entire 30 years

Alternatively, you have thought about it yourself and calculated an annuity loan. You assumed an interest rate of 2.95% fixed over 30 years. The total annuity is about 5.2% = 7,800 euros/year = about 650 euros/month. Under these assumptions, the loan would also be repaid after 30 years despite the lower installment.

You are wondering if this can be true since the bank gave you an "offer calculated especially for you"?

Without having recalculated now: assuming that the interest rate is actually 2.95% over the entire 30 years (I find that very ambitious), you would probably come out cheaper according to your calculation and information.

However, there is too little information available for a precise assessment of the building savings contract model. For example, I can hardly imagine that with a monthly installment of 750 euros the building savings loans would only be repaid after 20 years. Often, building savings contracts are saved up to 50% - i.e., the building savings loan is only 75,000 euros after 10 years -- with an installment of 750 euros/month = 9,000 euros/year the annuity would be 12% --> the interest rate cannot be so high that it would take 20 years to repay at 12% annuity.

I am not a fan of repayment through newly concluded building savings contracts. The interest yields are so low that the initial fee is hardly recovered in 10 years. In addition, with the annuity loan you have a compound interest effect, which reduces the interest burden and increases the repayment. With the pre-financing loan, the interest amount to be paid remains consistently the same.

Let's see if I understood correctly:

Your bank proposed:
- to conclude a pre-financing loan of 150,830 euros with a 10-year fixed interest period, payable at the end (only interest is paid)
- in addition, one or two building savings contracts (total building savings contract amount 150,830 euros) should be concluded, which after 10 years are supposed to repay the above-mentioned loan
- afterwards, the building savings contract loans are to be repaid by you with a term of 20 years
- the rate should be about 750 euros per month over the entire 30 years

Alternatively, you have considered and calculated an annuity loan yourself.
You assumed an interest rate of 2.95% fixed for 30 years.
The total annuity is about 5.2% = 7,800 euros/year = about 650 euros/month.
Under these assumptions, the loan would also be repaid after 30 years despite the lower rate.

You wonder if this can be true, since the bank offered you an "individually calculated offer"?

Without having recalculated now:
Assuming the interest rate actually remains at 2.95% for the entire 30 years (which I find very ambitious), you would probably come off cheaper according to your calculation and information.

However, there is too little information for an accurate assessment of the building savings contract model. I can hardly imagine that with a monthly rate of 750 euros the building savings contract loans would only be repaid after 20 years.
Often, building savings are accumulated to 50% - i.e. the building savings loan after 10 years is only 75,000 euros -- with a rate of 750 euros/month = 9,000 euros/year, the annuity at 12% would be --> the interest rate cannot be so high that you need 20 years to repay with a 12% annuity.

I am not a fan of repayment through newly concluded building savings contracts. The interest yields are so low that the acquisition fee is hardly recovered in 10 years. Also, with an annuity loan, there is a compound interest effect that lowers the interest burden and increases repayment. With the pre-financing loan, the payable interest amount remains consistently the same.

Hello, you pretty much got it right!!
I have now read up a bit on the topic. By absolute chance, I came across the Finanztip website. There they almost emphatically advised against financing with a building savings contract and also confirmed that financial advisors pocket hefty commissions from it.

One should always consider the individual case.

Taking out a bridging loan together with a new building savings contract is in my opinion not effective in most cases for the reasons mentioned above. However, there was once a request here in the forum for which I saw a building savings contract variant as the only sensible option (apart from saving more).

In my own case (according to current long-term planning), an existing building savings contract will also be included. With this, I want to repay my KFW loan in 10 years. If everything works out, I will probably only have to rely on the accumulated balance. However, if any kind of repair work on the building becomes necessary, this consideration would become obsolete, as the contract is primarily saved for the repair reserve. Then the KFW loan would have to be extended.

What I want to say is - there is not only black and white, but always different perspectives and approaches. Therefore, every financing is individual.