Is the construction project affordable? 570 k€ loan with a 5300 € salary

I find the rate of 1800 EUR too high and it does not match the income. If there is 1 child, and at the latest with 2, it will be a very tight situation (my experience). Therefore, I would keep the rate as flexible as possible (agree on a repayment change) and initially pay significantly less monthly.

From my point of view, the maintenance reserves are also very low. It is difficult to say, but every visit to the hardware store already costs 150 euros alone. If you then have to pay a craftsman as well, a few thousand are quickly gone.

Exactly that. But having a child doesn’t only mean "expenses." Being a parent is something completely new for oneself, for the relationship, and depending on the character of the little one (fingers crossed that they are healthy) a real challenge for 1-3 years. That’s when you see how people can harmonize with each other under sleep deprivation & stress (in the worst case). Children are not robots that "function" as planned. I don’t understand why this is always dismissed so "casually." But I don’t care. I find the loan amount crazy either way. Everyone builds their own hell, I always tell myself :-D.

This is not being dismissed casually, but it’s not the topic here when the original poster is asking about financing. The topic is getting out of hand here because the OP is not taking care of it and answering the questions. That’s really annoying! :confused:

Of course, you always manage, but there is a difference between "managing" and "being happy"

That's true. But it usually doesn't depend on money.

Paying off a property and working until retirement seems to be the end goal.

That sounds absurd in this simplification. Starting each day content in your own four walls, being grateful to play with the children in the garden, moving around in a stable, good, and clear neighborhood, having the good feeling of having your own retreat available... A lot happens while you are financing the property. The right home for your own life can contribute a lot to quality of life – whatever that may be at the moment. You write about six-figure wishes. Why only six figures? Why not eight? Why not two? Once you reach a basic level that many of us have, it’s pretty much irrelevant for a happier life. If it’s possible, it’s possible; if not, it doesn’t matter. You can always have wishes. That’s a good thing. If I were to buy a vineyard with an olive grove in Italy, I would be happy. If I don’t find one, I’m not one bit unhappier. I don’t make my happiness dependent on luxury standards. And about retirement – as if that were the fixed big turning point. From that point on, there is money (however much or little) without having to work in exchange. If work has long since cost quality of life, the question of a turning point should sensibly arise earlier. (Always under the premise: Lack of money in the sense that it’s no longer enough for food and housing is a tyrant that makes you unhappy. Perceived setbacks in lifestyle only make you unhappy if you cannot let go of standards. Having a lot of money is pleasant and very welcome but not important for a content life.)

Most things have already been said. We are currently building with a baby/toddler, so I can say that we both underestimated: 1) the desire to no longer work full-time and spend time with our child 2) childcare costs

I imagine it would be very unpleasant if this were no longer feasible within a comfortable range because of a construction loan (for everyone). Therefore, I would plan and calculate very conservatively here. What if one income is lower for longer than planned? (For example, the child is sick and/or should not be cared for outside the home too early).

I am therefore quite glad that we planned with a child, otherwise we would have overestimated ourselves.
With two part-time salaries, we are roughly at your €5300 and are comfortably financing €290,000. And this relaxed feeling is already worth a lot, I must say. We don’t both have to work full-time to service the loan.

Most things have already been said. We are currently building with a baby/toddler, so I can say that we both underestimated:
1) the desire to no longer work full-time and spend time with our child
2) childcare costs

I imagine it would be very unpleasant if, because of a construction loan, this would no longer be feasible in a comfortable range (for everyone). Therefore, I would plan and calculate very conservatively here. What if an income is lower for longer than planned? (Child, for example, is sick and/or should not be cared for by others too early).
I'm quite glad that we planned with a child, otherwise we would have overextended ourselves.
With two part-time salaries, we are roughly at your €5300 and comfortably finance €290,000. And I must say, this relaxed feeling is worth a lot. We don’t both have to work full-time to service the loan.

But then you are full-time in a COMPLETELY DIFFERENT league than the OP, you’re rather at 8-9k. Not really comparable, because: The OP now has €5300 with 2 full-time salaries. If you earn €2650 in part-time (fairly divided by 2), you are certainly in a completely different place than the OP.

Then you are full-time in a COMPLETELY DIFFERENT league than the OP, you are rather around 8-9k. Not really comparable, because: The OP simply has 5300 with 2 full-time salaries. If you earn 2650 euros part-time (fairly divided by 2), then you are certainly somewhere completely different than the OP.

Correct, that is why even more the advice to sharpen the pencil properly here as the OP :-)