Financing without equity - Repayment / Interest

We are 5 people. (2 adults, 3 children). We have a minimum income of €6500. Minimum because my husband works in shifts and sometimes brings in more. It varies up to 1-2 thousand more. This is the lowest salary set. On average, calculated over the year, it is about €700 more per month. We have calculated expenses of about €6000. This already includes a house financing (925€ + all other expenses one typically has, which are quite high due to the old building) because we bought an existing property 6 years ago which we want to get rid of. We would prefer to build in another location where you don't need a car for everything. There is still potential because I am currently on parental leave and want to work again afterwards. That would be at least another €400. Equity is not available for this reason because it always flowed into the house. The last €7000 are going into a small renovation that is necessary now in September. Hope it is easier to say something now.

P.S. We have new furniture and a kitchen, and all additional costs would be included. We requested a Schufa score, which is nearly 98% for my husband and nearly 99% for me.

Do you have to pay a [Vorfälligkeitsentschädigung]?

Difficult situation. Especially because the difference amount, which remains from the sale, is missing. The best way would probably be: sell the house, live in a rental apartment in the meantime, and then build in peace. That also brings equity and that is necessary anyway. Building now and possibly making a loss on the house sale would not be an option for me despite a high income. Especially with the responsibility for 3 children.

Schufa score doesn't interest anyone..99% surely all have it here. This silly score is completely overrated..with Schufa there is only negative (3%) or positive (99%) ;)

And a Schufa score of 98% is not good. But I am repeating this here for the tenth time now.

In the context of a construction loan, it is probably negligible as long as we stay below 80% LTV. Beyond that, it becomes interesting, but probably not impossible.