Real sales recorded at the notary (French DVF open data) in the cadastral sections of the Île de Nantes district of Nantes — not asking prices, signed prices.
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Even within Île de Nantes, two streets can differ by 20%. PropHound gives you the DVF of the exact cadastral section of every listing you source — free to start.
We start from DVF (Demandes de valeurs foncières), the open dataset published by the French tax authority: every property sale recorded at the notary in France (excluding Alsace-Moselle), with price and surface. For the Île de Nantes district we sample the cadastral sections within a reduced radius (~700 m) around the heart of the district (IGN cadastre), then aggregate the apartment and house sales of the sections hit — so the sample stays local, unlike a whole-city median.
We publish the median (not the mean, which outliers distort) over the last three years of sales, after removing aberrant values (< €300/m² or > €40,000/m², surfaces < 9 m²). The P25–P75 range shows where the central half of transactions lands — your real negotiation margin in Île de Nantes. At district scale the sample is smaller than at city scale — the number of sales shown tells you how solid the median is.
Source: DVF — data.gouv.fr (Etalab open licence), IGN cadastre parcels. Aggregated by PropHound. Indicative data, not a property appraisal.