Is a soil survey necessary when a geotechnical report is available?

2023-07-30 08:59:39

Attached to the development plan of our construction area is a comprehensive geotechnical report. This also includes foundation recommendations for buildings to be erected. I assume that a separate soil survey must still be conducted for our own property? Is it possible to make initial statements about the necessary foundation work based on the information provided?

2023-07-30 10:34:04

As I understand it, I need a main geotechnical investigation according to DIN EN 1997 and DIN 4020. Can preliminary assessments still be made?

2023-07-30 11:02:27

A soil survey is conducted on your property at the location where your house is to be built later. During development, the municipality takes soil samples at a few points somewhere in the construction area. Whether these can be applied to your property is unclear.

If I understand the report correctly, your main problem is that the basement may be below the groundwater level. This will be expensive and tricky to implement. The load-bearing capacity is apparently good and the usual gravel bed will suffice.

2023-07-30 11:14:58

Further below it says that the frost-free foundation should be 1 meter at your place, not 80 cm (as often recommended). A general expert report does not replace the personal one, that is correct.

2023-07-30 11:17:07

A soil survey is carried out on your property at the place where your house is to be built later. During the development, the municipality takes soil samples at a few points somewhere in the construction area. Whether these are transferable to your property is unclear.

If I understand the survey correctly, your main problem is that the basement can be below the groundwater level. That will be expensive and has pitfalls in implementation. Load-bearing capacity is probably good, and the usual gravel bed is sufficient.

Thank you very much. That the basement, if at all, has to be built as a white tank is explicitly stated in the development plan anyway. Therefore, we would refrain from it for cost reasons.

Can one roughly say how much a main soil investigation should cost per sqm or for a 650 sqm property?

2023-07-30 12:01:55

We paid around 800€ for our soil survey in 2021. There were 4 drilling points, one at each planned corner of the house. The site plan for the house was already available. The result of the drillings then led to a foundation recommendation, specifically for this location of the house. I think this is always done this way and not the entire property sampled.

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Is a soil survey necessary when a geotechnical report is available?

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