DIN standard for work with the compactor - cracks after the compactor.

Good day,

at our house (newly purchased), the water connection from the municipal utilities was replaced from the outside up to the meter.

In the process, a hole was dug in the exterior wall and the pipe was replaced using a rocket (according to the worker's statement). During the compaction of the soil, a tamper was used directly next to the exterior wall.

The municipal utilities commissioned a construction company for this, and the work was completed shortly before Christmas.

We only noticed later (mid-January), when we were back in the basement to prepare a few things for further renovation, that there were severe cracks in the wall—exactly in the two rooms where the tamper was used.

After reporting this to the municipal utilities and the person responsible, they came out to inspect it. Of course, they want to deny everything and claim that these are settlement cracks. (I then told them that we had a handover of the house with the real estate agent, and they can confirm that there were no cracks in these rooms before) but that is not the main issue now.

My question is, is there perhaps some DIN standard or recommendation from the construction industry that tampers may not be used directly next to the exterior walls of single-family houses, or something similar?

A few pictures for the curious:


Best regards

That is already quite intense... But I cannot imagine that there is such a standard. To avoid external settlements of the ground, it must be compacted right up to the house wall.