Construction cost payment schedules

Is it realistic to assume that I want to build a house (approx. 305,000 + 30,000 incidental building costs, etc.) and finance it, that if I have equity of 30,000 euros and take out a loan of 280,000 euros (50,000 KFW, 180,000 bank) and since the construction only begins in October, I can save the remaining 25,000 until March next year? Do you think a bank would agree to that or do they want everything settled so that you have to finance the entire amount minus the 30,000 you already have? I have no experience with building a house, but I have read that you only pay in installments anyway. And the 280,000 loan would be enough for a long time at first and by the time it is used up, we should easily have the rest saved. We just don’t want to take everything on credit and that also gives an incentive to save diligently throughout the year :)

We had a similar construct regarding the equity, which was largely held in a [Bausparer] and had to be "quickly overpaid" – the bank agreed to this and we do not have to use the equity first.

We had several inquiries with banks and all would have agreed to this.

The bank will require proof of the full amount of equity.

How you do that does not matter. Proving (still) non-existent equity will be difficult to impossible.

With Lex it is different, he had a bank statement of the building savings contract (where a part was still missing).

But you only have 5000 and 25000 are missing.

Yes great thanks, it is good to know that already! Then we will include that in the negotiations.

There are already 30,000. We can easily save 25,000 by next year. With the current low interest rates, we are now considering building.
House costs 275,000
Additional construction costs 30,000
Basement 30,000
Now we could leave out the basement, but I do want it.
The idea now is to pay the additional construction costs ourselves and save up for the basement.
We could finance everything, but they want about 450 euros to repay the two KFW loans over 20 years and then 1,000 euros to the bank, so that the 180,000 is paid off in about 15 years. Otherwise, it takes 3 years longer plus the interest, etc.
Well, then it gets more difficult, so a 90% financing, so that the 10% remains our risk, is 1 year a problem for the financing?

Are you sure that you can save €25,000 in one year? That’s €2,000 per month! And keep in mind that during this time the first interest payments and perhaps even repayments for the loans will already be due.