House purchase planned at the beginning of 2015 - No equity

Better conditions for rentals? Interesting approach... but better strike that idea again. Conditions in the commercial sector (V+V) are at best just as good as owner-occupied WoBau conditions. More likely worse, due to higher risk or higher equity requirements.

Theoretically, separate KFW funding can be applied for each residential unit. This could improve the overall conditions?

I haven’t been following everything here. BUT: I would never make my financing dependent on rental income. If you have it, you’re in a good position (can possibly make special repayments). But if rental payments fail, the whole house of cards shouldn’t collapse! Regardless of the fact that you can’t always rely 100 percent on relatives either, you should consider that there can always be unemployment, illness, or age-related problems. If I then have to bear the risk not only for myself but also for my tenants, the shot can quickly backfire.

And about equity: I always find it surprising how people without children in a small apartment with a good income cannot save equity – and suddenly, because of buying or building a house, it’s supposed to work? Can you suddenly change your lifestyle, finance children, build reserves...? If you now live in a two-room apartment in Frankfurt, then for the same money you can certainly get a three-room apartment in the countryside (where you want to buy cheaply). And then prove to yourself that you can build corresponding reserves. That will benefit you when buying a house and keep you on the safe side.

Quite amazing how everyone here talks about experience and dismisses various possibilities.
I am more than aware of the issue of rental income from relatives, just because I don't go into every little detail in this thread, it does not imply ignorance of certain problems.
The fact that someone else, still Mr. Know-it-all, thinks the loan won't pass the audit is getting more and more adventurous. If I am working strategically towards something, it also does not mean I am enforcing it with a hammer... really...

So far, I have always made my payments on time, I have always redeemed my loans early and both were only for the vehicle. This endless personal angle is slowly getting annoying. I don't have to prove anything to anyone when it comes to handling money, these constant accusations of naivety should really be done with.
I am quite aware that with our income we can finance a house even without equity, but that there are various risks that I don't like as well.

I think the situation is simply too complex for a forum, I was going to seek independent advice anyway - do you perhaps have any tips here?

Then don’t ask for opinions if you don’t want to hear them. A lot of well-meaning advice has been posted here by users who know the topic well enough. So far, it all seems to have been a waste of time, because you apparently only wanted to have your own approach confirmed here.

I’m not sure if that makes sense, I know these are relatively few details at first, but also because I’m certainly overwhelmed by the situation since it’s not my field.

Strange. And a few pages later you miraculously became an expert and don’t need any advice anymore. Interesting.

Well then. Be that as it may. I find it too tedious to continue wasting my time here. So I’m going to log out now.

Then you best ask someone who writes down the exact answers you want.

Good luck with the build, I'm out...

You may be aware that you can finance a house with your salary and without equity, yes. But either you lower your expectations; whether through size or location. Or increase your capital. That’s what they want to convey to you here.

I also once thought we would get our house and land for 460,000€. That has meanwhile become 590,000€. And if we hadn’t had corresponding capital, the topic would have either been postponed by years, much smaller, or most likely grounded.

Your salary may not be bad, but times have changed. My parents didn’t believe for a long time that the place costs that much, because they bought for 300,000 marks back then. In other parts of Germany we could almost get 2 houses for that money.

I’m also sure that no one here wants to talk you down. Why would they, I think no one here cares about your current or future life situations—whether financially stable or completely over-indebted. Every bank, by the way, doesn’t care either, they get their money—one way or another.

I also recommend keeping an eye on your finances and keeping records.
At the end subtract the cold rent and add all insurances plus reserves. Then you see what’s left.
Something like that quickly brings you back down to earth.

And statements like: “yes, this month I would have had to buy a new washing machine,” “yes, the month is not very representative either because the car was in the workshop,” “the last months I still had to pay another loan,” etc. My tip at this point: forget about calculating such costs, it brings zero, because looking at the past you quickly realize that for every single month you find an “excuse” why you didn’t put aside the 500€ but had to spend it. And that, everyone before me here is right, you don’t put away from one day to the next. In the future it will then be the costs for the child...

When I look at our calculations from 4 years ago (with our income at that time and without a child), I have to shake my head and say it would never have worked, had we “rushed” back then.

The signs for you simply don’t point to a pony farm with cotton candy, which doesn’t mean it can’t become that. Maybe in 5 years you will show us all the middle finger from the hammock in your garden.