Cost of a Swedish house on an undeveloped 2nd row plot

How much does a simple foundation slab including the earthworks cost approximately?

How much do four wheels for a car cost? Be honest? This doesn't make any sense. YOU have to take care of the costs... before you know it, the plots of land are gone... It is also up to you to inform yourself, call home builders, etc. The questions you don't answer for us are questions you should ask yourself.

The thing with the semi-detached house sounds dangerous. What exactly would that mean?

First of all, it only means that you have to build an extension. But since the neighboring house is already there, the neighbor has basically taken the decision about the basement away from you. If he doesn't have a basement, yours would be unaffordable given the tight budget, because you would also have to support the neighbor's house. If he has a basement, it depends on how it was structurally designed. If his basement wall was not planned for an adjacent slab foundation, significant additional costs would arise for you if you plan without a basement.

Would you then basically have to build like the neighbor?

No.

So dimensions, type of construction, etc.?

The semi-detached houses must be mutually compatible and coordinated. But this is already regulated by the development plan, since it allows very little leeway anyway.

True, it is developed

No, it is not.

I referred to the bridging to the house in the 2nd row, so the connections with extension, so to speak.

That was correct, too. How is the development supposed to be carried out and secured? Are the costs for it included in the land costs? According to the aerial photo, there is still a building next to the front house. Looks like a garage or a carport. If that is to be removed, where should the parking spaces go then (both your neighbor’s and yours)?

The thing with the semi-detached house sounds dangerous. What exactly would that mean? Would you basically have to build like the neighbor? Like size, type of construction, etc.?

No, it just means: if the neighbor decides on a semi-detached house, you have to do the same. If he chooses a detached house, you also have to follow suit (and then keep a distance from the boundary on both sides).

Overall, this seems to me to be an extremely strange development plan. I don't see any coherent access roads, and only some plots are designated as "GFW" areas (but not outlined). This development plan is obviously intended to regulate where each individual property owner can sell or lease a building plot "in their yard/garden," and apparently leaves it up to each individual to arrange the legal access to this building plot. In Sparta, they would probably have called this "conditions like in ancient Rome" *ROTFL, SCNR*

What does a simple foundation slab including the earthworks cost approximately?

To clarify this for beginners as well, as Yvonne did, no one knows. How flat is the land really? How load-bearing is the soil? Is the soil contaminated and does it have to be disposed of at high cost? How large will the foundation slab be and how thick? Earthquake zone? (In southern Germany often zone 1 or 2) To what extent does building in the second row increase costs, e.g. because only a small concrete pump and mixer can access it? These are all questions that depend on your specific plot and house. Very roughly, you can estimate around €20,000-25,000 for a foundation slab, without earthworks. However, this can also increase significantly.