Purchase and financing of a semi-detached house - realistic and feasible?

I did not find the interest rate in % anywhere and please provide the effective rate including all fees for the [Bausparvertrag]. The question is, do you want/need 25 years of interest rate security? I would also not advise against using the 250k€.

Hello everyone and first of all thank you very much for the numerous responses!

We have also taken these into our considerations and are now moving away from the idea of taking out a 100% loan despite having equity. Currently, we have 3 financing offers available, between which we can decide in the coming days:

Offer 1: Loan amount of 550K€ through a combination of 3 annuity loans (terms/interest fixed periods in years: 25/25, 20/20, 25/10 KFW), interest rates averaged effective approx. 1.23%, monthly installments decreasing due to different terms from initially 2200€ to 1700€ in the last 5 years, total costs until full repayment in 25 years: 84K€

Offer 2: Loan amount of 500K€ through 1 annuity loan (term/interest fixed period in years: 25/25), effective interest 1.15%, monthly installment 1950€, total costs until full repayment in 25 years: 74K€

Offer 3: Loan amount of 500K€ through 1 annuity loan (term/interest fixed period in years: 28/15), effective interest 0.95%, monthly installment 1700€, total costs until full repayment in 28 years: 69K€ (could be reduced to 56K€ by special repayment to align with the installments of the two above-mentioned offers). Remaining debt after 15 years of fixed interest: 246K€, or 191K€ with the mentioned special repayment.

Special repayments as well as 2 changes of repayment rates are included in all offers.

Offer 1 would have the advantage of retaining more equity as security for possible additional costs or potentially investing it profitably. However, the interest rate fixed period of the KfW loan expires in 10 years and the additional capital is not necessarily required.

Offer 3 has the appeal of the low interest rate and the resulting lower costs. However, at the end of the fixed interest period in 15 years, a fairly high remaining debt is still outstanding, which would then have to be refinanced with interest <3% to actually make use of this advantage. What does your crystal ball say?

The current favorite is therefore offer 2 due to planning security through the interest rate fixed until full repayment at moderate costs. Additionally, we have offers from the same provider for credit protection (RLV, BU), which can be concluded via simplified application procedures and are significantly cheaper compared to other offers.

What would be your assessment?

Somehow everything is completely incomparable, I think. Not even the total is the same?!

There are still some other offers for comparable conditions (especially loan volume), which have already been ruled out due to worse terms (interest rates, fixed interest period, additional costs due to complex structures with home savings contracts, etc.). The three mentioned offers therefore each already represent the favorites on their own.

Well, okay, I probably just went about it differently. I first determined the loan amount, installment, and fixed interest period for myself and then looked for the best offer. Maybe I adjusted the loan amount by another 5k because of the loan-to-value ratio. Maybe I also increased the installment by 50€, but not 50k more loan and 500€ more installment.

For me, it feels like being asked, should I take a Golf for 30k or a Boxster for 80k?

But if offer 2 fits, then let's go.

I would personally choose offer 3 because it is the cheapest. Given your income and assets, I do not see the residual debt problem in 15 years. Offer 2 is also good, and if it helps you sleep better, it is the better option for you.