Data sources
Where the numbers on BienCheck actually come from
Everything you see on BienCheck comes from official French public datasets. Here's the full list, with direct links.
DVF (Etalab geo-dvf)
Official French property-sales database (notarial deeds). We pull the per-commune CSV files Etalab publishes on data.gouv.fr.
Géorisques (BRGM, MTE)
Flooding, clay shrink-swell, seismic, radon, industrial sites, underground cavities, plus the commune's natural-disaster (CatNat) order history.
ADEME — EPC/DPE
National database of energy performance certificates. We use it for the local EPC mix and energy-bill order of magnitude.
PLU / GPU (IGN)
Géoportail de l'Urbanisme: the plot's official zoning (U, AU, A, N) and building rules. Used to spot land potential or restrictions to confirm at the town hall.
OpenStreetMap
Daily life around the property (schools, shops, pharmacies, transport, parks) and nearby noise sources (motorway, railway, industrial zone).
BAN — National Address Database
Address geocoding and normalisation (IGN). Used to attach each property to the right INSEE commune.
INSEE
Official register of towns, departments, regions and populations. The backbone of our local-page network.
Refresh cadence
DVF is published twice a year (April and October). Géorisques updates continuously, hazard by hazard. ADEME publishes new EPCs every month. We reprocess our aggregates in rolling batches to stay aligned.
Traceability
Every page names the source and the year of the data. If a figure looks off, you can trace it back to the original dataset in two clicks.
What we don't use
We don't use listing sites (SeLoger, Leboncoin, etc.). We don't buy third-party non-auditable databases. We don't use any generative model for figures or images: just aggregation.
Links to the official portals
Here are the official portals where you can browse the source data yourself.
- data.gouv.fr/datasets/demandes-de-valeurs-foncieres-geolocalisees
- georisques.gouv.fr (hazards + CatNat orders / Gaspar)
- data.ademe.fr — existing-dwellings EPC database
- geoportail-urbanisme.gouv.fr — PLU / PLUi / CCB (IGN apicarto)
- openstreetmap.org — POIs and infrastructure (via Overpass)
- adresse.data.gouv.fr
- insee.fr — Code Officiel Géographique