Although the ImmoWertV prescribes the basic methodological framework, it deliberately leaves room for professional judgment regarding individual, property-specific characteristics, which may be weighted differently depending on the valuer.
The selection and interpretation of comparable data, such as which sold properties are considered genuinely comparable, can also vary between two experienced valuers.
However, larger deviations of more than ten to fifteen percent often indicate methodological errors or insufficient knowledge of the property on the part of one of the valuers involved and should be questioned.
Differing valuation dates, for instance when two appraisal reports are prepared with only a short interval between them, can also lead to notable differences in value during volatile market phases.
In the case of larger discrepancies, it is always worthwhile to compare the respective comparable properties used and the methods applied in order to objectively trace the cause of the deviation.
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