Is building/buying a house feasible?

Well, I calculated that 20k will be withheld. That can come in handy, especially if additional risks need to be considered during this time. Maybe something goes wrong with the handover of the [ETW] or the money comes in too late. Or the construction is delayed. I wouldn’t start building a house with 5000 euros in the checking account. If then 150k is contributed, 455k needs to be financed. The bank sees a value of 561k in return. That amounts to an 81% financing.

The house is currently not yet online. The final plans with the developer are still in progress, so the sale will probably start in September. A complete construction phase will be developed. A total of 62 houses and 30 condominiums in multi-family houses.

The first construction phase will be occupied this year. The houses in the 2nd construction phase are similar to those in the first. Therefore, it is already known what they will look like. The prices are above those of the 1st construction phase. However, the values from my initial post are already quite accurate.

Currently, the monthly repayment for the apartment is 226 euros. Our interest rate is still over 4%. The fixed interest period (10 years) is currently expiring, so we have to consider whether to continue financing and stay living there or switch and sell.

Why sell then? I assume you could easily ask for €1000+ rent for an 80m² apartment in your area? Then put €300 into repaying the apartment, €600 into the house, and €100 as reserves for renovation work.

why sell then? I assume that for an 80m² apartment in your area you could easily ask for 1000€+ as rent? Then put 300€ into repaying the apartment, 600€ into the house, and 100€ as reserves for renovation work.

and where does the equity come from then?

why sell then? I assume you could easily ask for 1000€+ rent for an 80m² apartment in your area? Then put 300€ into paying off the apartment, 600€ into the house, and 100€ as reserves for renovation work.

We would probably rent out the apartment for 900 cold including parking space. But then we would have to pay taxes on that, so the "profit" that could be used for the house or similar would be less again.

And I am missing about 120,000 euros in equity, which means the loan amount would be higher.

and where does the equity come from then?

The apartment still counts as equity, but only with the portion that has already been financed.
Of course, the loan amount for the house will then be higher, but so will the repayment rate.

We would probably rent the apartment out for 900 cold including parking space. But then we would have to pay taxes on that, so the "profit" that can be used for the house or similar would be less again.

With a value of 220,000 you already have 4,400€ tax allowance through depreciation + other possibilities to deduct something. There shouldn’t be that much tax coming out of it.