Question about soil condition building plot, single-family house planned

Hello dear fellow builders,

are you sure about the soil survey? As I said: 7 meters west of the building window a drilling was carried out the year before last, as well as about 24 meters east of it. The soil survey recommends a dense basement and a slab foundation (at this point: What exactly does slab foundation mean? Thanks!) for construction, quote, "in this area" anyway. There is no suspicion of contaminated sites, I have also looked at photos and maps of the last 150 years: it was undeveloped. Unless someone buried an atomic bomb, it should be clean and the risk is in the range of general life risk. Flood risk is actually not present (H EXTREM of 0.2m, H 10-100 = =). Earthquake risk (0) is also known. The surveying company is now offering a quick survey based on the neighboring drilling (do you notice something? :)).

No architect or builder has said anything about the soil survey topic, except that it probably comes down to a white tank, which is okay for us. One architect said the soil corresponds to 80% of those in the area and he advises against a soil survey for now - you should look at the neighbor who starts earlier, and if bigger problems arise there, you could possibly do one.

The consumer advice center and the building owners' protection association recommend a soil survey just like you do, however all without knowing the municipality's soil survey.

Slowly I am really confused. No survey and rely on the municipal survey. Or have one done based on the drilling from two years ago? (Isn't that nonsense? I already have those data anyway). Or really reinvent the wheel again?

Again: without a soil survey and building recommendation from the expert, no one can give you a warranty on the house to be constructed. And that will be anchored somewhere in the small print of the contract. For example, we had a lot of stones in the ground, our neighbors next door did not! Are you afraid of the necessity or the action, before having to do one before the purchase?

So we would still do it after the purchase.

Well, we would still do it after the purchase.

must! ;)

The thing is: when plots of land are scarce, and you have found one, you take it even though undefined additional foundation costs play a role. However, it is important: to calculate a realistic amount. Unfortunately, neither here nor anyone who does not know the plot can say whether it will be 2 or 20 thousand euros in additional costs.

Let's put it this way: We'll just count on the white tank - if necessary, we might just build a basement for living (1m deep), another full floor, and a large attic - that should be enough. And you're right: the market situation is crazy and our plot, since it's from the municipality, is still at a fairly good price. Even if it then costs 20,000 more, it is still cheaper than everything else we've seen (where we also didn't know the ground conditions ;)). But thanks for your opinions and experiences!