Feasibility Single-family house + land 400,000 €

To the point: With that budget you need very much own effort.

At least not if you are not able to provide a lot of own effort (and I’m not talking about the usual flooring and painting work here).

Maybe you could share your assessment/experiences once again?
By how much do you think one/the OP can reduce the price? 20k? 50k? 100k?

Filling, painting, flooring, landscaping is still obvious... what else do you think?

Maybe you could once again share your assessment/experiences? By how much do you think one/the OP can lower the price? 20k? 50k? 100k? Spackling, painting, floor coverings, outdoor area is still obvious... what else do you think?

It is never a good idea to build according to budget. That usually goes wrong.

I think 50k of own contribution is definitely achievable. If he really gets such an inexpensive plot of land, doesn't plan a luxury house, one could manage with around 400-450k.

How much do you think one/the OP can negotiate the price down? 20k? 50k? 100k? Filling, painting, floor coverings, exterior landscaping are still obvious... what else do you think?

You won't get far with that. You have to go for the jugular. The daughter of friends built a really decent house with her future husband after work and during vacations. The two did the entire interior finishing and electrical installation themselves. Dad helped with the electrical planning, checked and built the fuse box. A professional company did the plumbing and heating, a local construction contractor did the shell construction and brickwork. The two were able to negotiate good conditions at a local building materials supplier. Not for wimps, especially since neither had learned a construction trade. They really accomplished something and here people would have called it impossible. Surely it helped that Mom and Dad had built the same way. It wouldn't have been possible otherwise, as a hefty six-figure amount would have been missing. I would have lacked the will and discipline - but that doesn't make it impossible.

Nevertheless, it is an unpleasant situation to know that you spend a lot of money every month and get "nothing" in return.

Phew, that sounds very negative. Of course, you get a lot for that money, namely your apartment, and that without worries!
Anyone who thinks that you save money in the long term by building a self-used home and paying off a loan for 30 years is mistaken. In the first 3 years, all remaining money is invested in the outdoor area. After 6-10 years, renovation becomes necessary... 15 years after the house is built, possibly already replacement of the facade or technology. You are caught in the vortex of spending. Only freedom entices you to build a house.

There is a reason why not everyone can afford a home, maybe we just have to accept that.

It does not always have to be building a house: an existing or terraced house also has just as much value!

Your problem will be the low income.

I actually thought that with just under 3000 net, I don’t earn so badly by the German national average.

It is not that low either. Some users here have simply been lucky in their career choice.
Go to a financing advisor and familiarize yourself with existing or terraced houses.
Please do not undervalue anything there!

Maybe you could share your assessment/experiences once again? How much do you think one/the OP can negotiate the price down? 20k? 50k? 100k? Filling, painting, flooring, outdoor area is still obvious... what else do you think of?

If the thread creator does anything at all, it will be painting and floors. And that usually does not reduce the asking price, since these components are often not included. That reduces additional costs. Therefore, I estimate 0€.

The daughter of friends built a really decent house with her future husband after work and during vacation.

Fine and all, but extreme examples like doing the entire interior work including electrical yourself are completely off the table. The second child is on the way here. With a newborn, nothing happens on the construction site.