Land in sight, is house construction financially possible?

You will never find out all the actual costs in advance. Especially not from the general contractor (GU), since it is very city/municipality/plot-specific. But definitely everything related to the building structure. The GU can say what this or that additional service costs. Whether you build with A or B is just a guideline, but it influences the ancillary construction costs less, because nothing changes there. I also wonder if it really has to be a 30K kitchen? Show kitchen? Why wouldn't a 10K kitchen do as well?! I will probably never understand that... Cross out carport, small shed, and photovoltaics. Do those separately (have them done). I would be really interested to know what your house would cost at Town & Country or roughly based on yours there, or at Heinz von Heiden, to name two affordable builders...

That's not just the kitchen, but also all the lamps and probably a new dining table. And it's still a long way from being a show kitchen. Having the carport and shed done separately, I'm still not sure if that will end up really being cheaper. I haven't requested any quotes from the mentioned "budget providers" yet, but you're right, it would be interesting to know the price difference.

But let's assume all that could be 150,000 EUR cheaper through a cheaper provider, without a "show kitchen" and leaving out one thing or another and maybe doing it later (although I always get told: if you don't do it directly, you'll never do it). The plot should cost 122,000 EUR (which is almost 39,000 EUR more than in my calculation), then in total that's still 639,000 EUR. Let's generously round that down to 600,000 EUR to satisfy everyone who always claims that it doesn't cost that much (then the house completely costs 478,000 EUR). 135,000 EUR equity was mentioned, so there's still a financing requirement of 465,000 EUR. At currently about 4.1% interest for 15 years (one day a little less, the next day a little more) and a repayment rate of 2%, we're talking about a rate of 2,363 EUR. That's almost half of the inquirer's income.

Thank you all for your contributions. We are deciding against the property.. currently, there is quite a nice existing house for a little over 500,000, where we are trying to negotiate. Although the rate without the 190,000 kfw will probably not look much better either.

here are my examples:

Garden house Luzern (approx. 10.5 sqm) and double carport 6x5 both ordered from McGarden24, back then (2020) both around 1.5K each… meanwhile prices went extremely high, now back to an earlier level.
Kitchen is a Burger, SoftClose and automatic pull-out. At the back left, the corner cabinet at the bottom is a Le Mans. Only the cabinets including a row in the storage room. 5K. Ok, that's for an approx. 8 sqm kitchen. And I would say it’s nothing to be ashamed of. Furthermore, I can only give the tip to talk to the general contractor about whether you can directly add additional orders with the trades. Example: having the staircase finish done during the sampling would have cost around 800€. I contacted the staircase builder directly, booked the finish, metal instead of wooden rods, and a straight post for the top end of the staircase for 650€. Just the finish alone would have been about 300€, all gross prices.

What I want to say with this is, you can say "just do it" and pay the price, or you can research and organize yourself and definitely save money.

Thank you all for your contributions. We are deciding against the property.. currently there is a pretty decent existing house for a little over 500,000, where we are trying to negotiate. Although the rate without the 190,000 KfW probably won't look much better either.

Don't you earn too much for the KfW loan?

Aren't you earning too much for the KFW loan?

Due to my recently established practice, no. As far as I know, the penultimate and the year before that apply. Even in 2024, it would be quite possible since I had relatively little income in 2021 because of the medical licensing.

We are out for the NRW loan.
We are still struggling with the decision... but my calculation that we only need slightly more than 400k in loans after purchasing the land is already really tight.

here are my examples:

Garden house Luzern (approx. 10.5 sqm) and double carport 6x5 both ordered at McGarden24, back then (2020) both about 1.5K each... in between the prices went extremely high, now back to an earlier level.
The kitchen is a Burger, SoftClose and automatic pull-out. At the back left, the corner cabinet below is a Le Mans. Only the cabinets including a row in the storage room. 5K. Ok, that’s for a kitchen of about 8 sqm. And I dare say it is nothing you’d have to hide. Furthermore, I can only give the tip to talk to the general contractor if you can directly make additional orders with the trades. Example: having the staircase final treated during the sampling would have cost around 800€. I contacted the stair builder directly, booked the final treatment, metal instead of wooden rods, and a straight post for the top end of the staircase, for 650€. Just the final treatment alone would have been about 300€, all prices including tax.

What I want to say with this is, you can say "just do it" and pay the price for it, or you can research and organize yourself and quite well save money.

Well, the kitchen for example is ok... but nothing more... looks like a Poco showroom piece and definitely not really good without exaggerated things... not for nothing does almost everyone here spend at least 20k for a reasonably large and good kitchen... and by that I don’t mean the cheap extractor hood for 70€ and the oven by Beko with ceramic hob... do you need better things? No... but you can clearly see that money was saved here...