Determining the value of a property now takes just a few minutes. The statistical models used by management firms and property portals produce an instant, free, and sufficiently reliable figure to frame the discussion. Their limitation is that they never produce a single price, only a range — and it is precisely the gap between those two bounds that determines whether a transaction happens.
These tools are based on comparison. The property is matched with recent transactions with similar characteristics — floor area, number of rooms, location, year of construction — and its value is inferred from that sample. The more active the local market, the larger the sample and the tighter the estimate.
The logic works well for standard properties in dense areas. It begins to lose traction as soon as the asset moves away from the average, and even more so for income-producing properties, where value depends on rental flows the model does not account for. That is why management firms distinguish between two levels of service. Galland & Cie, for instance, offers a real estate valuation in Lausanne online, free and instantaneous, complemented by an on-site appraisal when the file warrants it.
A model does not visit the property. It cannot assess the true condition of the finishes, the quality of the insulation, exposure and views, neighbourhood nuisances, or the orientation of the main rooms. Two apartments that look identical on paper, located in the same building two floors apart, will not sell for the same price, and no cadastral data can anticipate that.
It also overlooks the legal and accounting side of the file, which is often decisive: a right of way, a building right, the state of the renovation fund in a condominium, works approved but not yet started, an ongoing dispute between co-owners. None of these elements appear in any comparison database, yet they can shift value by several tens of thousands of francs.
On the Lake Geneva arc, the breadth of transactions makes these gaps all the more visible. Recent sales published by Vaud-based management firms range from a three-and-a-half-room apartment at CHF 1 million to an investment building worth several million, with valuation logics that have nothing in common.
For wealth planning purposes, a range is enough. It makes it possible to determine whether an arbitrage deserves to be examined, to position a portfolio, and to open a family discussion.
It is no longer enough once a figure carries real consequences. A listing set too high ties up the property, and the discount that follows a prolonged time on the market often outweighs the expected upside. An inheritance split or a buyout of heirs’ shares is negotiated on a single value, not on an interval. A bank financing file requires a contradictory appraisal.
The real question, then, is not whether automated valuation is reliable — within its own scope, it is. It is knowing at what stage of the project precision stops being a comfort and becomes the condition for making a decision.
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