Online valuation tools have proliferated in recent years — property websites, bank simulators, dedicated platforms. Their appeal is clear: instant, free, accessible at any time. Their limitation is equally clear: they cannot provide an accurate valuation of a property.
How automated valuation tools work
These tools are based on statistical algorithms that process large volumes of transaction data: price per square metre by area, comparison with recent sales of similar properties, correction coefficients for size, floor or year of construction. The result is a price range derived from averages — which is, by definition, the negation of what makes a character property valuable.
What they cannot take into account
An algorithm cannot assess: the quality of the stonework, the height of the ceilings, the orientation and quality of the view, the acoustic quality of the environment, the density and age of the garden, the coherence of the renovation, the history of the place. All these factors, which can represent 20 to 40% of the value of a character property, are simply invisible to a statistical tool.
The specific case of rare properties
For rare properties — listed properties, isolated estates, exceptional bastides — automated valuation is structurally impossible: there are not enough comparable transactions to calibrate the algorithm. The result is either an absurd figure or a prudent refusal to provide a valuation.
The value of a professional assessment
A rigorous property valuation by a professional familiar with the local market and the qualitative specificities of character properties integrates all these dimensions. It is not a simple market average — it is a reasoned judgment, informed by real knowledge of the place and the market.