What are the costs of the different property diagnostics required by French legislation?
No official document can answer this question. The cost of a diagnostic is assessed by the diagnostician themselves based on their estimate of the time required to carry out the diagnostic. The newer a building is, the lower its cost. In the case of a sale, there are certain diagnostics that are only mandatory for houses built before 1949, for example, for lead diagnostics, or 1997 for asbestos diagnostics.
Nevertheless, it is possible to take an average of the prices for a property diagnostic: 3eHabitat shows here the latest estimates calculated based on an average of prices recorded in France, so you will find the average price of different diagnostics depending on whether it is an apartment, a house, and according to the number of rooms in the apartment. It is noted on the site that these diagnostics represent a “certain disparity in prices depending on the observed regions,” where the prices calculated in the Paris region “are significantly lower than the prices calculated in the provinces.”
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Although the prices of property diagnostics may be free, competition among diagnostic providers can limit abuses. However, the client must take the time to compare prices.
Moreover, the larger the surface area of the house, the longer the diagnostic takes, so it is normal for the price to be affected. Some diagnostics, such as gas diagnostics or the state of natural and technological risks, do not depend on the surface area, so their cost is constant regardless of the housing.
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Price of gas diagnostic: between 100 and 130 euros
Price of ERRT diagnostic: between 20 and 40 euros.
The most expensive of them seems to be the main diagnostic according to the archives of Mon-Diagnostic-Immobilier.com, which in some particular cases can go up to 220 euros or more (surface area, accessibility).
In the case where it is necessary to carry out all the mandatory property diagnostics of 8 (not counting disinfection diagnostics, which are mandatory in certain specific cases), the bill can range between 300 and 500 euros, depending on the surface area, of course, and the diagnostic methods you will use.