House and property €284,000 financeable?

1100€ loan installment + 400€ additional costs = 1500€ monthly housing costs * 12 months = 18000€ annual housing costs And with your initial figures and no equity, I doubt that you can manage with a 1100€ monthly loan installment. If you yourselves cannot raise such an amount without rent, then forget it!

Not even without rent? You would definitely end up around break-even if you build.

I’m surprised anyway that although the equity is in the garage, it was inherited. Even if you care for and maintain it, no 1000€ per month goes into the hobby.
In this respect, you should basically consider where your money is going or whether you even want to spend the money that a house costs monthly.
Often you have to choose between a hobby and your own home.
For you, a fixed garage is also a must. ...

The desire for a home is not an ad hoc decision

Well, if you read correctly, then the car was restored. And I don’t know how much you know about it, but that doesn’t matter!

And as I said, you don’t sell something like that!
Sorry, then I’d rather forgo the home beforehand!

Bien-Zenker has several expansion stages. The "ready for finishing" stage still requires a lot of work and money. You can view the expansion stages on their homepage (Menu > Construction method > Expansion stages).
Regards

Actually, I'm surprised that so far I haven't found a prefabricated house offer without a roof and exterior wall.

And as I said, you don't sell something like that! Sorry, then I'll give up the house beforehand!

Sentimental pile of junk. Get rid of it.

Basically, your initial question has not yet been answered. Your question was whether financing is possible under these conditions.

Even if everyone says that it is generally not a good idea, if I were you, I would get financing proposals from financial advisors in order to decide for yourself (and now comes the very important "with common sense") whether it works financially. But please have the calculations done using the figures presented here in the forum/in the post and not the fantasy numbers from the developer.

Because the financial advisor will always tell you that everything is no problem in order to collect the commission.

284,000€
+ 8.5% purchase incidental costs (25K)
+ 40K finishing costs (there's a lot missing in the finishing stage) and some special requests
+ 40K additional construction costs
+ 10-15K garage
+ 10K outdoor facilities
+ 10K buffer
===
That brings us to 424,000 which the bank would definitely finance.

Of that, 35K would have to be financed through something like Hanseatic at 5.99%.

Just the 390,000 will cost you 1,700€ per month (2.35% interest for 15 years with 3% repayment). Anything else would be reckless; so starting repayment at 1.5% with more than 100% would be risky.

On top of that, there are approximately 300 EUR for the subordinated loan.

Then there are things like furniture, lamps, kitchen, moving, etc. (another 15-20K) which should be paid out of your own pocket.

But feel free to go to Bien Zienker. Just to get a feel for such a conversation and the whole thing in general.

Also, I would recommend going to the house bank or a financial broker as suggested.