1.5 meters below the road edge

What do you mean by that? Heavy rain can also cause trouble with the basement - unless you build your basement completely waterproof, but then including appropriate windows, etc. However, the fun is not exactly cheap.

What do you mean by that?

Hello K1300S You are right. I hadn’t read properly. I was thinking that it had to be filled up. But still: a basement is suitable here and is not much more expensive than filling it up. Steven

Well, "not much more expensive" depends on the equipment of the cellar, but at least one would have saved other expenses that can be offset against it. However, if I really want to make the cellar waterproof including [Fenster], then it will be expensive expensive expensive.

You still have to backfill additionally with basement! In my opinion, the costs are significantly higher...

Why so biting right away?

Not "right away," but only since it has become fashionable that municipalities ...

There is no birthright to an optimal plot of land.

... interpret it in such a way as to surround the building plot with raised streets; people who think they must have home ownership should then first properly pay for the earth to be filled in. That is antisocial and therefore diametrically opposed to how a municipality should behave.

If the municipality did the filling, they would add it to the plot price.

The municipality is precisely filling in instead of burying the sewer pipes as they properly should. And they do so—antisocially for a municipality—according to the Sankt Florian principle. Unfortunately, it takes (simply because the plot areas are larger than the development areas) a multiple amount of material to "go along" with this unnecessary elevation on the plots. So in the end, it is not only a shifting of public costs (which, due to the land readjustment, have to be prepaid anyway) to private households, but a multiplication of the costs. This violates every budgetary saving requirement and, in my opinion, will only persist as long as no one legally challenges it administratively. As a resident, in the case of a raised development, I pay for every cubic meter of excavation saved under the street a whole dozen cubic meters of filling on my plot. Mind you, I would have also paid for the excavation cubic meter under the street, practically in full, in the case of a residents' street. So the municipality only saves itself a prefinancing but multiplies the costs for the residents, which is simply in bad faith under municipal law. They will only get away with this until someone gives them a judicial slap. The purpose of a balanced municipal budget does not justify all means without measure. Even mayors have to put their heads together and find new ways, otherwise they should call themselves citizen apprentices.

You still have to backfill additionally with a basement!
In my opinion, the costs are significantly higher...

Hardly any backfilling... the basement won’t be 1.50 m deep anyway.
So whatever excavation is left there will later be covered again all around.

Of course, there are costs for the basement. But since there are pro arguments for a basement due to the backfilling, etc., the original poster should weigh this for themselves. (No garage for storage, house technology in the basement, ...).
However, there are also plenty of reasons to build without a basement (like me...).