Construction financing without equity as an option?

You probably mean to still receive the old conditions on Monday, right?

The rate really sounds doable, but I personally couldn't sleep somehow with almost 600K in debt.

Which area are we talking about here?

The 40k is already gone for the acquisition incidental costs. You won't be able to set any of it aside, and going into a renovation without a buffer ... well.

Ultimately, it would be that I would receive 570,000 EUR for 1.87% (with a fixed interest rate for 15 years)

So, the main loan is 1700 EUR

results in a repayment of 1.7% and a term of 39.5 years!!!
When do you want to pay off the house?

We are talking about at least 750,000€ total loan.

Example: mixed interest rate of around 2%, repayment 2.8% results in a rate of 3000€, term 27 years.

That's why I asked about the area … because then you could see the whole thing as "instead of rent"

You really have to question why at 35 and with such a great income you only have 45k in equity.

Are you happy with a 3k installment + incidental house costs during the first few years?

The belt will be tightened very much when it comes to purchases, vacations, etc.

You really have to question why, at 35 and with such a great income, you only have 45k in equity. Are you happy with a 3k installment + ancillary housing costs in the first few years? The belt will be tightened very much when it comes to purchases, vacations, etc.

The problem is rather that the milkmaid is at work here again. The 3k will probably not be enough, alone the 2.9% for the consumer loan for ancillary costs is absolutely unrealistic in the current environment. One should rather calculate with 5-6%. Furthermore, the 100k for the renovation will not be enough unless everything is done by oneself. However, I do not assume that the income comes from craftsmen. So sorry, but I see this as much too risky given the circumstances.