It doesn't work without equity - experience!

Saying that building without equity is too risky is, in my opinion, too simplistic. One should always consider all the surrounding conditions. We also did a full financing, including the kitchen and the remaining BAföG amount. So according to some opinions, highly objectionable.
There was no equity because both were studying. After graduation, the studies first had to be refinanced, 2 cars bought, the apartment furnished, and they got married. With the lower starting salary, there wasn’t much to put aside. We fixed the interest rates for our real estate financing for the most part (except for the KFW portion, which is only for 10 years) at 25 years. The residual debt after 25 years is negligible. The residual debt of the 10-year KFW portion is also manageable with a high interest rate increase since we still have enough reserves. Our rate is €1180 per month with a net income of €4500 and one child. Our region belongs to the lower end nationwide when it comes to living costs. In addition to the rate, we are currently still saving into an old building society savings contract that yields more interest than our financing costs. It will mature in 1.5 years with a balance of €15,000. With that, for example, we could reduce the KfW loan. I think there are significantly riskier financings.
And if the house alone suddenly becomes 40% more expensive than previously planned, either the planning was wrong beforehand or the wishes during the construction phase were handled roughly...

We have now solved it like this. 2 loans: 300k over 30 years, 50k over 10 years. After these 10 years, there is an outstanding debt of 28k, and refinancing this "small" amount is no problem, even at an interest rate of 8% or more. Our average interest rate is 2.3%, equity capital 80k...1150k repayment with a net income of 4000 and one child, soon 4500€. However, we were also told that it would have looked bad without equity capital.

As long as you find a bank that goes along, everything is no problem.

We are doing 150,000 with 10 years fixed interest rate via KfW and 210,000 over 20 years at another bank. The mixed interest rate should be around 2.3%. Not dream conditions compared to the above but we are glad that it works at all.

Do you have no concerns about the possibly significantly higher refinancing rate after 10 years with the 150,000 € through the KFW? Depending on what ultimately remains, of course. I also don't know what interest rate the KFW currently has. For me, that's one reason why I would rather exclude the KFW, but of course everyone sees that differently.

The monthly burden will certainly increase somewhat. I speculate that this will be offset by intermittent inflation/wage increases.

I speculate that this will be offset by interim inflation/wage increases.

toitoitoi