Soil survey report for house construction

Hello everyone,
no soil survey has been carried out on my property yet. However, there is a survey from the opposite property and one a little further away using test pits. My neighbor from the opposite property was kind enough to give me the survey.
It mainly concerns moraine clay. The question is to what extent I can rely on the survey and whether it might be better to commission one myself. Can soil conditions change that drastically? What do you think?

I assume that you already own the property and want to build on it. Then you are about to spend a lot of money. Therefore, take about €1000 in hand and have a soil survey conducted. This will give you some planning security. You can give the soil survey to the civil engineers and will then receive relatively concrete offers. If you don't have a soil survey, the civil engineers will only give you estimated prices later, with which you as a layperson can't do anything and also can't calculate what the whole thing will ultimately cost you. If things go badly, it will unexpectedly become so expensive that you have to finance it additionally, and your €1000 will have been saved in the wrong place.

A soil survey involves 2-4 drillings at the corners of the house. You get a certain certainty about what lies beneath your lawn. Perhaps a previous owner disposed of garbage here, there might be large stones in the way, or depending on the location of the properties the groundwater level may be different. Surely 4 drillings are not exact statements, but they give indications.

In our case, the soil survey indicated that we had to replace about 1.30m of soil with gravel because the existing soil was not load-bearing. Without the soil survey, the following amount of additional costs would have badly surprised us.

Saving on the soil survey is saving in the wrong place... my opinion

Hello,
I am currently asking myself a similar question.
I have had a plot of land reserved and am now wondering whether I should have a soil survey done before the purchase.
Do you have any advice on this?

If you don't do any, you buy the cat in the bag....

but if I don't yet know exactly where the single-family house is supposed to be located, then getting an appraisal is difficult, isn't it, or are there alternatives? It was said that the groundwater level is quite high, so a white tank is required for the basement. No statement was made about the condition of the soil.

Hello,

our house building company considered a soil survey mandatory because they don’t want to have problems with us as customers later on if the slab is planned incorrectly. It was strongly recommended to us since the groundwater level is supposed to be very high in our area. Yes, it is 70cm below ground. Since we are building without a basement, the costs remain within limits, but the slab will be thicker, made waterproof, and twice the amount of steel reinforcement will be added. The house will also be built slightly higher for safety since the plot slopes about 30-40cm towards the house. The whole thing costs us about 4000 euros more. Soil survey before purchasing the property: I would first ask several immediate neighbors what kind of ground was found. Unless it’s a peat/marsh area or there are meter-deep rocks somewhere, I would buy the property. Blasting rocks or too much soil replacement could be expensive. If I were building with a basement, I would make sure the groundwater is not at 70cm like it is for us. That would be too much for me despite the waterproof concrete shell. It is after all only concrete and cracks could appear someday.