Hammer blow and ladder rights are totally nonsense for this case
The property is in BW, the garden is fully landscaped, and it is not a new building plot but a very old one. About 3m from the boundary is also my garden shed, and I store wood, roof tiles, and paving stones here on concrete slabs. A few younger walnut tree saplings (about 5 years old) and possibly a cypress (about 10m high, certainly 20 years old) would also suffer from this.
I don't see why I should allow soil to be stored there free of charge and to my disadvantage, potentially affecting my property. On Monday, I will do an inspection with the contractor. If he is still interested in the storage, I will draw up a contract documenting the condition and specifying the condition after the storage. I will also charge for the storage – where do we think we are here? I had to pay for every service during the house construction, so why should I help a general contractor from Poland save money at my expense? It is obvious that this is purely a cost-saving measure for him. If a single-family house without an underground garage had been built 10m from my boundary, I might have been willing to provide storage space free of charge for the sake of future neighborhood goodwill. The best part is that the structural engineer does not want the rough builder to start without the neighbors' consent. Presumably, he is concerned that the excavation might have to be extended onto my property, which I would not allow.