The indices are calculated based on the net vendor transaction prices (excluding transfer duties, notary's fees and agency fees). The methodology for the calculation of these indices is based on hedonic models accounting for the price of a dwelling based on its characteristics.

Using these models, the value of a reference second-hand dwellings stock is estimated at the prices for the current period. An index is defined as the relationship between the current value of this stock and its value during the base period (since september 2018: Base = 100 on average in 2015).

See : Price index for second-hand dwellings stock: detailed methodology (in French only)