Soil survey in the Hannover area. Costs? Providers?

That is - with all due respect - nonsense!

With the soil survey - without which no sensible person in Germany should build - the geologist provides a foundation recommendation. If the civil engineer follows this recommendation and it later turns out, contrary to expectations, that it was incorrect, the liability lies with the soil surveyor. Based on the foundation recommendations, any civil engineer can submit a fixed-price offer; if he cannot, I would look for another partner!

Source: my garden book

Rhineland greetings

Rarely have I read such an unrealistic nonsense; with 2 boreholes on 85m2, I certainly don’t have 100% certainty, despite the foundation recommendation. However, I come quite close and of course I also get a fixed price. But from a business perspective, everyone would calculate a safety surcharge, and that’s what I meant by "or else a way too high offer." Sometimes reading completely helps...
Billing by cubic meter and delivery note is the for everyone.

If I have pushed away 30 cm of topsoil, I still don’t know whether there is load-bearing soil underneath. Furthermore, I usually have to compensate for a height difference with the sand layer, so 30 cm of filling is wrong in almost all cases. But probably all our clients are simply exceptions...

Good evening,

Rarely have I read such a detached-from-reality nonsense,

I have thought for quite a while whether I should answer you or not ... my tolerance threshold for bad behavior is very low; now that I am ill, it tends toward zero. Then it occurred to me (again) that besides being a mod, I also have a real profession and recognize nonsense when I see/read it.

with 2 boreholes on 85m2 I certainly don’t have 100% safety, despite foundation recommendation.

You brought 2 boreholes into the discussion; not me.

From a business perspective, everyone would calculate a safety surcharge, and that’s what I meant by "or just a much too high offer." Sometimes reading fully helps... Billing by cubic meter and delivery note is standard for everyone.

There is a reason why you no longer work as a mason; right?

Every general contractor, every civil engineer for sure, can prepare an offer based on a soil report combined with a preliminary site plan (site plan including terrain elevations). Every reputable general contractor or civil engineer will tell their client in which range => +/- Euro <= to expect tolerances, because they primarily assume the worst-case scenario.

If I have pushed away 30cm of topsoil, I still do not know if there is load-bearing soil underneath. Furthermore, I usually have to compensate for a height difference with the sand slab, so 30cm filling is wrong in almost all cases.

I am sorry, but I cannot follow you ...

When I have a preliminary site plan, I know the terrain profile. If I also have access to a geological report, I know the soil condition. So where is the problem in creating a transparent offer for the client?

But probably all of our builders are just exceptions...

I can hardly comment on that as I don’t know what you mean by the job of a house seller. For my part, I always strive to generate long-term references from my projects.

Rhenish regards

I thought about for a while whether I should answer you or not ... my tolerance threshold for bad behavior is very low

Aha... A "You probably haven't been working in this profession for long" from you is normal tone, but when I say "rarely read such nonsense" then that is bad tone? Well, now you know the standard applied...

You brought 2 drillings into the discussion; not me.

How often do you drill then? The independent experts working nationwide that I know always handle it this way. From about 100m2 the 3rd drilling comes, and if it gets bigger, then even more. At least that's what I was told, I have never stood next to it.
If you drill more often, then please give a guideline where we can all look it up. I’ll tell them that they have been doing everything wrong for years.

There is a reason why you no longer work as a mason; right?

Yes, of course there is a reason, it’s called an accident at work. See first answer for the rest...

Every general contractor, every civil engineer for sure, can prepare an offer based on a soil report combined with a preliminary site plan (site plan including terrain elevations). Every reputable general contractor, civil engineer will tell their client in which range => +/- Euro <= tolerances are to be expected, because they primarily assume the worst case.

So what now? Fixed price or tolerances? According to my dictionary both cannot go together. Fixed price remains fixed price, whether the expected quantity is exceeded or undercut doesn’t matter, that’s why it’s done...
Of course, one can offer the worst case and if something is left over, the client is happy, or vice versa. But that has nothing to do with the mentioned FIXED PRICE.

The originally mentioned 30cm is stated in the offer long before the client decides on any company and it is always too little, that’s all I said.
Of course, later on (usually after buying the house) the costs can be estimated more precisely, but that does not help because the property has already been bought. Since the report is included in the price by many companies, very few will commission it themselves beforehand, even if it would be smarter for the overall calculation.
With a bit of luck the client was at least informed before, but more simply cannot be done at that point and other claims are off the market.
Why a billing based on delivery note and previously agreed (and compared) price per m3 is not transparent, I really don’t understand, there are no tolerances here. By the way, I never advised against the general report, it always makes sense.

I can hardly comment on that, since I don’t know what you understand by the job of the house seller. For my part, I always strive to generate long-term references from my jobs.

That has accidentally happened to me before too and that even without twisting facts....

Hello,

Aha... A "You probably haven't been working in this profession for long" from you is normal tone, but when I say "rarely read such nonsense," then that's bad manners? Now we immediately know the standard applied...

No, anyone who bowls should definitely know how to set up the pins You already caught my attention with your first appearance in this forum; for someone who enters a "living room" for the first time as a newcomer, you introduced yourself quite well.

That has accidentally happened to me before as well, and even without twisting any facts....

I don't like these nitpicking details, and certainly not the insinuation implied. That has nothing to do with good manners; even though I am aware that the internet reduces some inhibitions to a minimum.

My suggestion therefore: it may well be that we both had a bad start with each other. Let's end the discourse here and you do what you signed up for here: provide your knowledge to the questioning users. For that, it would of course be helpful for the users if you would tackle the topic of your profile

Rhenish regards

I don’t like these petty details, and even less the insinuation implied therein. That has nothing to do with good manners; even though I’m aware that the internet reduces some inhibitions to a minimum.

Rhenish greetings

I can return that about the insinuations, even though yours are admittedly more subtle. By the way, my "inhibition threshold" is the same everywhere...

Suggestion therefore: it could well be that we both had a bad start with each other. Let’s end the discourse here and you do what you registered here for: provide your knowledge to the questioning users. It would of course be helpful for the users if you would tackle the topic profile

Rhenish greetings

Fits from my point of view, with that the topic is closed for me as well. But I’ll stick to my opinion on the soil survey...