Smart Assessor: Keep Calm and Manage Your Data Quality
Marco Kuijper RO, Ruud Kathmann, Luc Hermans
It is obvious that data has a great influence on the quality of the outcome of the valuation
process, the assessed values. Data of poor quality will automatically lead to poor quality
valuations. Keeping the data quality up-to-date is not that simple. For instance because of the
fact that geographical information (most information used for valuations is geographical
information) tends to change frequently.
A second reason why it can be difficult to adequately manage the quality of data is caused by
the fact that real estate markets are continuously changing. In changing markets, other
characteristics can become more or less important. If, for instance, sustainability measures,
such as solar panels, are becoming more important it is the duty of the assessor to detect this
when he performs the market analysis. Subsequently it is his responsibility to find ways to
systematically collect this data and to include it in the valuation model. In addition, when all
this is done, it is the assessors' job to keep the data up-to-date.
In the Netherlands we have a decentralized system where all (355) municipalities are
responsible for the annual assessment of more than 9 million real estate properties. The
Netherlands Council for Real Estate Assessment (NCREA) is the oversight agency that is
responsible for the quality control. At this moment, we consider it as one of our main tasks to
make municipalities aware of the fact that they have to keep their data up-to-date. In other
words, they have to manage the accuracy, completeness and timeliness of the registered object
characteristics and they have to make sure that the right characteristics are registered.
Event: FIG e-Working Week 2021
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