Goal House Construction - Feedback Requested

The calculation is with regard to the banks and only considers my situation; if the training is not accepted, then I can justify the second calculation on my own...my partner can cover other costs in the background.

The main arguments for building currently are, of course, the interest rate and the land situation in Brandenburg near Berlin; if I wait a few years but the land prices rise at the same rate (currently €10-20 per m² per year), then I will face the same situation in a few years...I will have equity by then, but the financing requirement will also increase.

If I also take aspects such as inflation into account (a €1300 or €1500 installment is a higher burden today than in 10 or 15 years).

Conversely asked...

So why are you putting yourselves under stress now and insist on completing a tight financing, when you could approach it much more relaxed in a few years (then also with significantly more equity)?

What would a relaxed financing look like?

Relaxed, in my opinion, is e.g. our financing. Although we are financing TEUR 335, we have also contributed nearly TEUR 300 as equity to the house construction. Countable income (after company car, etc.) is about EUR 4,500 for a 5-person household.

There are, of course, significant differences in risk tolerance. For me, it would be important to keep the risk of something going wrong as low as possible.

That means: secured income on both sides and of course a correspondingly high income so that the installments and appropriate savings can be covered without problems. For me, it also means that at least temporary unemployment/illness... and correspondingly reduced income can be bridged. Preferably, the child is there so that you really know what costs that causes (e.g. childcare costs can sometimes be around 500 €). I would also save more equity so that in case you really have to sell the house, you at least come out of the whole thing without debt. The ideal case is of course (but not possible for everyone) that the installments can be covered with one income.

To summarize:
1. Equity (in my opinion at least 20% > by the way, if you calculate and really save 1,700 € per month, you would be at 130-140 k € equity after 5 years with your current equity, which would already be a good foundation)
2. For the financing amount, a higher income, preferably both working
3. Family planning completed or at least the costs of one child should be generously planned for.

Our case is certainly very relaxed as well:

My husband is under 30, I am just over; 4-person household, family planning completed; equity ratio 30%; financing ends in a maximum of 25 years (realistically in about 20 years); the house could also be maintained and paid off by both of us alone