How much house can I get for my budget?

Is the question actually serious? Today is April 1st after all????

I don't think anyone here wants to ruin your dream. Only the construction prices have partly increased due to the low interest rates. I had also underestimated that, not to your extent, but still by several thousand. Thanks to some tips from the forum, I then planned a larger buffer for the financing. Nothing is worse than a dream turning into a nightmare.

I don't know where you got the numbers from, but question everything. I don't believe the foundation slab is included there. Nor the other things that Manu1976 listed.

Now seriously,...

...why don’t you just read a bit in the forum.
Your topic is discussed here in all its facets: how expensive this is, how expensive that is. What can/must I do without...

We can’t start with Adam and Eve every day. Somehow I expect that at least one knows what distinguishes woman from man if one wants to explain something... and then very quickly the thought arises that the questioner is not serious.

Is the question actually serious? Today is April 1st after all????

The question was asked yesterday

My estimate is of course without basement

OK, now for an attempt at another serious answer (there have already been some serious answers before).

1) First of all, the question is whether the plot is developed or what still needs to be done (you can easily spend 20k on that). The soil can also make a huge difference.
2) For the sake of logic (actually just a minor point): Why a utility room if a basement is planned?
3) I consider the personal contribution to be overestimated. Doing electrical and plumbing work yourself is only very limitedly possible (assuming you are not an electrician and plumber yourself). Installing windows definitely not. There will never be a warranty on the house and it will disrupt the schedule.
4) A house with the budget is possible. The question is WHAT kind of house:
If you omit the basement, the external staircase, the guest room and the walk-in closet, it starts to become realistic. Of course, then it’s not a custom-designed house, but pretty much the simplest off-the-shelf model there is, with few extra wishes, in the 100+ square meter range. Why have a basement anyway? You build a basement when you need the space or can afford it (and the extra cost due to sloping terrain or necessary foundation depth is low). You might be able to use the attic as storage or, if money is available (which I don’t see), build a garage later.
Have a look around for offers on simple shell houses. There you will also see what personal contribution is possible and what savings potential there might be. But you also have to calculate the costs and time realistically. With all the interior finishing, you will be occupied full-time for months.

OK, now I have read through your other posts. Now I think I have a better overall picture. You are still very young and not yet established professionally. If you are still in the middle of your studies, I would not commit to one location yet. You don’t know where your career will take you and how secure it will be. At that age, so much still changes in life. I don’t know your reasons why you absolutely want to build now. But if it’s only the low interest rates, that is no reason to build at the moment. My recommendation would really be to save or alternatively buy a condominium suitable to your current income. Ideally in a place where property prices are not falling and at a later time, when you are established professionally and with your family, possibly sell the apartment and use it as equity. This is just a tip, if you still want to go headfirst into it, no one here can help you anymore.