Hello Slintrebla,
I would like to add to @Voki in this case. First of all, it needs to be checked whether the setback areas of the building structure as it currently stands still remain on the property. Among other things, the following must be examined ...
1. ... to what extent the neighboring property has been altered compared to the original terrain
2. ... whether any change (excavation/filling) was done only partially or over the entire property
3. ... what framework the development plan sets regarding the height
No lawyer is needed for this at first, but ...
1. Neighbor’s building application – check this regarding the heights of the original terrain! Possibly compare with heights from older sources (canal and road planning, soil survey).
2. Neighbor’s building approval
3. Updated calculation of setback areas or how the fine was explicitly justified, which violations were explicitly documented – pay attention to whether there were partial fillings on the site at the common boundary or if these are provable – if yes, they trigger their own setback area (!) and this then directly affects your property. It is therefore interesting whether and how the terrain relief was changed contrary to the specifications of the development plan.
Review by your architect; regarding the documents, you have a legitimate interest, i.e., at least the right to inspect the files.
Basic solutions here:
- raise your own terrain, if possible within the development plan (often 1m standard in development plans without additional building application) – this will incur additional construction costs, but then there is no disadvantage afterward
- if 1m or the height change allowed without approval in the development plan is not sufficient, represent the desired raising of the terrain in the building application and have it approved (possibly with the justification that the neighbor has demonstrably built too high)
I am very skeptical, like @Voki, about shifting additional costs such as terrain raising, retaining walls, etc., onto the city or the neighbor (partially), but changing the terrain surface offers plenty of approaches that can be examined because fundamental errors often occur at this point in many building applications, in later expansions, and also during approval.
So ... I would not write off the issue completely yet and initially it will not be expensive.
Best regards Dirk Grafe