Buying land without a soil survey?

Hello,
A few days ago, we finally found a suitable plot for us by chance. Location, price, development plan, etc. are all perfect for us. It is located in the 3rd phase of a new development area and is currently being developed. We were allowed to reserve it until the beginning of next week. However, due to the long waiting list, we have to decide promptly then.
How does it work with a soil survey now? We can't organize that quickly, can we?! Is it enough to ask the surrounding neighbors and to plan an additional 20,000 as a precaution for earthworks? We want to build without a basement, quite high up on the hill, but rather flat. It doesn’t seem to be wet either, at least there is no visible water/water plants, etc.
What could cause high costs?
I know, we are approaching the topic quite naively. But there are hardly any plots at the moment, and this one would be almost perfect...

Hello, We accidentally found a suitable plot for us a few days ago. Location, price, development plan, etc. are all perfect for us. It is in the 3rd section of a new development area and is currently being developed. We were allowed to reserve it until the beginning of next week. However, due to the long waiting list, we have to make a decision promptly then.

Deciding things in a hurry is usually a mistake. Now, since it is a new development area and there are probably already other houses, you might have the chance to briefly talk to other builders and ask what could go wrong.

Asking neighbors never hurts, but the building plot is not very interesting for a simple single-family house anyway; in the worst case, something has to be replaced, but it doesn't cost 20,000.

We only had our appraisal done more than a year after the purchase. Reason: the plots had already been sold long before development began.

Any unpleasant surprises? No! The only cost item we somewhat underestimated was the removal of the soil, due to the cellar.

Okay, thank you!

We had previously had one in another location in mind, where the construction company calculated additional foundation costs of 30,000 euros due to the necessary pile foundation. So yes, theoretically it can also get very expensive with a slab foundation...

But the neighbors surveyed in the current NBG had no problems with the development. We will ask again, though.

The rush is a bit of a problem... But actually, that's how it is here at the moment. Either you buy the well-located plots quickly, or they're just gone... only ugly or overpriced ones stay on the market for a long time.
The plots located in "our" NBG were all reserved within 3 hours. We were so lucky to get one at all.

The worst thing that can happen after the report is that you sell it. And the way you describe the situation, that should not be too big of a problem.