Planned terraced house - contract structure/planning?

Hello everyone,

since my land search is still unsuccessful (I just received a rejection yesterday). Decision by the municipal council/local council, apparently it’s harder to get a chance from outside, I have now also been to a new construction project. The contract structure is the same as in one of my previous posts: owner from whom you buy the land, a planner you have to pay extra, and an FH provider who builds the house (network where everyone involved earns a bit extra). Basically, many things would fit: the development looks well planned. The location is great for me: infrastructure, proximity to the workplace, schools, etc. A total of between 6 and 10 terraced houses are planned, depending on size, and arranged at right angles with an inner courtyard (greened), which sounds good at first. Now there is one thing I’m puzzling over: the owner is building an underground garage with direct access to the basements (it is planned that each house practically has 2 parking spaces in the basement, meaning about half of the basement opens onto the garage. The garden is entirely above the underground garage. 60 cm of topsoil is planned. How does that work with plants and especially rainwater? How is the water supposed to drain? What makes me somewhat uncertain about the project: you basically buy the land including the basement and underground parking space from the owner (only this purchase contract is notarized). Then the house comes separately from the FH manufacturer (building obligation)... meaning I am the builder. What should one pay attention to here? If the rainwater drainage/sewer system is not fully arranged, then I’ll have puddles in the garden afterwards. It will probably also be difficult with plants, I think. It will come down to some perennials and otherwise lawn. Maybe a small fig tree or something. But maybe I could live with that. The plots are not big anyway and what do you really want to plant in a terraced house garden. A building plot would of course have been better. But you just don’t get those here anymore. By the way, cost point for the project: between 600 and 650k, depending on the size of the plot (between 200 and 250 sqm), but about 35 sqm of communal area must be deducted. Many thanks in advance for your opinion.

How is that supposed to drain there?.

Good drainage.

With plants it will probably also be difficult, I think. Will come down to a few perennials and otherwise lawn area. Maybe a small fig tree or something.

I find your concerns justified, although there are also other plants that are not deep-rooted but shallow-rooted. A classic garden is something else – here the concept apparently is a orderly lawn/terrace design only as a place of rest, but not for cultivation. That may be enough for some city dwellers; the focus here is the accommodation of the fleet. I would rather see it as a condominium – a single-family house with garden is something different. However, it is sufficient for many. Should everyone find their own house builder there or is one named?

Yes, that's true. Although the children currently mainly want lawn. No, that is a fixed RH provider ([G***Eigenkapital]). The houses themselves look quite nice.

Only if someone told you that the real estate transfer tax only applies to the land: I would be rather skeptical about that, and from my point of view, that would be significantly more important than the technical implementation of the garden on the [TG].

Yes. I can imagine that the tax office values it like a property developer project. But I don't know. I've heard different things. The notarized purchase contract only covers the land, cellar, and [TG].

..and as I said, what gives me a stomach ache is how this can be solved with surface water/rainwater drainage. Not that the area is constantly underwater.