Groundwater cost consequences experiences?

please fill out the questionnaire, we really have too little information now to be able to help

Which questionnaire do you mean?

at 1.3m groundwater I would not build with a basement, the water can also be higher in wet years,

I have to spontaneously think of the house in the water by Glatthaar.

Which questionnaire do you mean?

The questionnaire that is pinned at the beginning of the floor plan thread, I can't link it, can you please help me

the questionnaire that is pinned at the beginning of the floor plan thread,
I can't link it,
can you please help me

I'm not ypg, but I'll gladly help you anyway;)

https://www.hausbau-forum.de/threads/grundriss-planung-unbedingt-vor-beitrag-erstellung-lesen.11714/

Hi,
here is my opinion on the additional effort

Groundwater control for the construction period:
- Depending on how deep it needs to be lowered (at least 0.5 m below the excavation base)
- Only possible with vacuum pumps (must be planned by an office), which have to be operated weeks in advance. Discharge of the water into the sewer. (Of course, the whole thing must be applied for with the municipality)
- Depending on where construction takes place, documentation of neighboring buildings in case of settlement damage caused by water lowering.
- Since, in my assessment, sandy soil is present, the slopes must be laid out with < 45°. Depending on the excavation depth, the construction pits quickly become quite large. An alternative is shoring. In water/sand preferably with sheet pile walls, since no water can run in from the sides. Beam-and-board shoring probably works as well.

At the end, the basement sealing as a “[Graue Wanne]” is added.

It all depends on how deep you want to go with the basement... In any case, a basement will not be cheap.

Water at 1.3m below ground level is already very unfavorable. Depending on the soil conditions and the distances to the neighboring buildings, this can actually become uneconomical very quickly.

I carried out the groundwater lowering on our construction project myself, including all necessary calculations and applications. It was not a walk in the park, I can tell you that. But we initially had water at 2.5m below ground level and the luck that the soil was very gravelly.

Do you have a soil report available? What exactly does it say about construction water retention? I’m afraid you might need sheet piles as well. Due to the sheet piling, in a construction project here on our street, the neighboring house completely got out of alignment. Then the sheet piles were too short, had to be pulled again and repositioned, even more trouble, etc. etc. Now 200K wouldn’t cover the costs of the work + damages to the neighboring house (4 residential units).

Personally, with the water level like yours, I would definitely have given up on building a basement. Believe me, you won’t be happy about it. You can’t imagine how much water accumulates in a very short time. We lowered about 1m and had 2 pumps running almost continuously. You can read through my posts on the subject if you want.