Error in financing?

Since I would not make any compromise with a significantly downsized house or property

I have to reply once again. No compromise on the house! But willing to make a compromise on the cost of living? Having to have a house at all costs because it is supposedly cheaper than renting? That does not add up.

Why should I miscalculate when I am now somewhat exaggerating the current situation so that it is finally understood:

Currently: rent 1,200
Loan repayments: 800 euros

Loans are in the last months or... almost half of the outstanding amount is already on the regular checking account, I could pay it off like that and then the issue will simply be resolved in the coming months, for EVERYTHING except BAföG.

House depending on the calculation of the additional costs, where I believe they are not that high due to kfw-55 and you certainly need fewer reserves with a new building than with an existing property, but never mind. Let's say a total of 2,000 euros... see above!

With the current expenses, we have over 1,000 euros left at the end of the month with an upscale lifestyle (from my perspective), i.e. eating out a lot, many purchases of "luxury goods," etc... Even if it all stays like this, then despite the house this amount is "left over" - for further desires, for special repayments, and so on...

I have the feeling that this point of view is simply overlooked?

And how irrelevant is the equity from another loan? That is simply part of the overall financing, goes through the same bank and is just a component? I look at everything as a whole, then I have my TOTAL interest costs and the whole thing is still much, much more attractive than it was 5 years ago for someone with 20% equity...

What am I overlooking?

You overlook self-reflection and willingness to compromise.

In my opinion, something like that is now present in some areas, but you simply have to react differently in certain areas.

If the house construction goes as smoothly as it does with us, in the end you will have to be treated for high blood pressure because of your behavior.

You are, if you want to!!!, on the right path, but still very far at the beginning of the path.

No one demands 50% equity from you, but you have already received enough hints about it. You always only see black and white. The shades of gray in between are overlooked (or deliberately ignored).

I can understand that you are irritated/annoyed. But honestly, your writing style does not have to be like that. I have written you my opinion on what you have described here. I overlook nothing and have understood everything. You just simply have a different opinion. But I also have no desire to go round in circles multiple times if you do not want to see for yourself where your arguments simply do not fit or are wrong. I am not saying that your plan necessarily has to fail, I just have serious concerns (see above).

I keep repeating myself over and over again,

you don’t need to do that! Instead, you should read carefully what we are writing here, you overlook the exact warnings or the questions posed to you, which you dismiss offhand as if those and further risks did not exist. You bury your head in the sand with certain questions and close your ears, under the motto: what I don’t know doesn’t exist.

I find it really shocking how EVERYONE here advises against building a house,

No one is doing that either, almost everyone here is just amazed by your rough calculations – and ultimately a construction project that is supposed to cost over €400,000, where there isn’t even a breakdown of the costs available. I assume that because YOU ONLY SEE YOUR PROJECT BUT DON’T EVEN GATHER INFORMATION IN OTHER THREADS ABOUT WHAT COSTS HOUSE BUILDING CAUSES (I can shout too) We are talking about -> namely €500,000 ...

All of that is included so far in the first calculation, in the 425k.

I think a detailed breakdown of these costs in a separate topic and a reality check would do you good. I don’t believe that’s enough.

Uwe is quite right!

Oh oh, warning: building a house is a compromise in 80% of cases! You can’t realize everything, either for financial reasons or simply because of regulations and development plans.

And again he is right!

Yes, maybe I'll do a breakdown sometime, but under a different nickname, otherwise I already know the answers beforehand.