Construction financing: sensible or nonsense?

Exactly about 275k pure house costs including paving and terrace

about 345k with garden (lawn) lamps, furniture (dining/living new), kitchen, ... simply everything that is now in and around the house!

I would structure the financing so that it is largely paid off after 20 years. This is achieved through a correspondingly high repayment rate.

Loan amount: €310,000.00
Disbursement date: 29.11.2018
Frequency of installment payments: monthly
Duration of fixed interest rate period: 20 years
Fixed nominal interest rate: 2.00% per year
Initial repayment rate: 2.65%
Amount repaid at the end of the fixed interest rate period: €201,444.60
Outstanding balance at the end of the fixed interest rate period: €108,555.40
Total interest payments made: €86,572.39

For me, the outstanding balance of €108,555.40 would be a reason to increase the repayment rate:
Initial repayment rate: 4.00%
Installment amount: €1,550.00
Amount repaid at the end of the fixed interest rate period: €304,623.38
Outstanding balance at the end of the fixed interest rate period: €5,376.62
Total interest payments made: €67,393.61

If you can afford the installment of around €1,500, this would be my favorite.

1500€/sqm including or excluding ancillary building costs?

excluding ancillary building costs

If you can afford the rate of about 1500 €, this would be my favorite [/B]

You read that the two only have 3700 euros net? 1500 + additional costs "about 2.5€ per m2" are monthly expenses of about 350 euros, nobody has eaten yet, let alone paid for a car, no bank would go along with that.

I have read that. But this is meant to illustrate that including the building savings contract is rather the lesser evil.

If the outstanding debt at the end of the fixed interest period is €108,555.40 and we assume that the interest rates might only increase by 1 percent, the following picture emerges:

Loan amount: €108,000.00
Duration of fixed interest period: 10 years
Fixed nominal interest rate: 3.00 % per year
Initial repayment rate: 10.33 %
Amount of the installment: €1,200.00
Amount repaid at the end of the fixed interest period: €108,000.00

Total interest payments made
- from this loan: €14,510.14
- from the first loan: €86,572.39
Total €101,082.53

The calculation of the desired installment of €1,000 only makes the situation worse:

Loan amount: €310,000.00
Duration of fixed interest period: 20 years
Fixed nominal interest rate: 2.00 % per year
Initial repayment rate: 1.87 %
Amount of the installment: €1,000.00
Amount repaid at the end of the fixed interest period: €142,485.13
Outstanding debt at the end of the fixed interest period: €167,514.87
Total interest payments made: €97,531.86

Have you ever looked at HVB, they also offer 30-year fixed interest rates quite affordably.