Construction financing - Your assessment?

He 34 2800€ net, she 34 1000€ part-time 2 children 380€. Equity 60000€, and a building plot that will be sold in 2 years 100000-150000€. New build semi-detached house costs including land 450,000€.

1: Sparda-Bank loan 100,000.00 EUR, fixed for 10 years at nominal 0.97% -> Remaining debt after 10 years around 75,500.00 EUR, repayment possibly through land sale

2: Sparda-Kombi loan 100,000.00 EUR, fixed for 10 years at nominal 0.97% -> Follow-up financing through building savings loan around 57,700.00 EUR at 1.40% until full repayment (30.05.2035)

3: KFW 153 " 100,000.00 EUR, fixed for 10 years at nominal 0.90% -> Remaining debt after 10 years around 66,200.00 EUR, repayment possibly also through land sale

4: Riester loan total 100,000.00 EUR, at nominal 1.29% until allocation of Riester contracts -> Follow-up financing through Riester building savings loan at nominal 2.00% until full repayment (30.02.2047 or 30.07.2037)

Average rate 1200€

yes okay although that would be too many components for me. But they all have the same fixed interest period so you can combine them

I consider the building savings contract as absolutely unnecessary for protection given the expected capital inflow. Especially since the nominal interest rate of 2% (the effective rate is probably closer to 2.5%) is not a good condition for 28 years of interest rate security. You would currently get that with an annuity loan or even better conditions - maybe not at [Sparda] ;)

Therefore, I would also massively cut down on components.

If you want security, go to another bank and fix for 20 years.

I would also go towards 1x bank loan over 15 years + KFW. Especially Riester has its limitations.

If you include the money from the land sale into the special repayment, the loan should be almost paid off in ~18-19 years, or the remaining debt after the fixed interest period hardly plays a big role anymore.

If you can possibly push the repayment to around 3% in 2-3 years, you will be done in ~15 years.

10 years would not be okay for me.

Despite the sale of the property, there will still be a large remaining debt in 10 years. I would consider fixing part of it for 15 and 20 years instead. The risk that the proceeds from the sale of the property for the garden, garage, or other unaccounted additional costs will be used up is also mitigated by this.