Transparency

How we work, what we measure, and what we don't.

Guiding principle

NextToYourPlace is not an affiliate comparator nor a data reseller. It is an analysis platform based on official public databases, computed using documented and auditable methods. The customer pays for expert reading, never for sponsored recommendations.

Data sources

All displayed data comes from official public sources. Each value indicates its source and extraction date:

  • Géorisques (Ministry for the Ecological Transition) — Seveso/ICPE sites, PPRn/PPRt, BASIAS/BASOL, clay hazard, cavities, radon.
  • BRGM — seismicity, clay shrink-swell, aquifers, cavities database.
  • SISE-Eaux (Ministry of Health) — tap water quality (PFAS, hardness, pesticides, nitrates).
  • ADEME / DPE — energy performance diagnoses aggregated at commune level.
  • ANIL / OLAP — observed market rents.
  • DGFiP — DVF — property transaction values over five years.
  • INSEE — population, median income (Filosofi), age structure, poverty index.
  • ARCEP — fibre and mobile coverage.
  • DREES — APL indicator (access to general practitioners).
  • DEPP / IPS — school social position index.
  • OpenStreetMap (ODbL) — shops, services, transport, nightlife.
  • Météo-France — climate, humidity, precipitation.
  • SNCF Réseau, Cerema, DGAC — railway/highway noise, airport noise exposure plans.
  • RPG / Agence Bio / BNV-D — agricultural plots, organic farms, pesticide pressure.
  • SDES / criminalité — recorded crime against property and persons.

Refresh: most sources are refreshed monthly to quarterly, depending on the producer's publication cadence. The date shown next to each value is the extraction date, not the publication date.

Computation methodology

Address analysis proceeds in five steps:

  1. Geolocation of the address (lat, lon) via the French National Address Database (BAN).
  2. H3 indexing at resolution 10 (~66 m radius) for precise per-address reading, with neighborhood aggregation (7-cell ring).
  3. Anomaly detection per dimension: comparing local value to regional and national medians, identifying threshold breaches (WHO for water, INSEE for income, DREES for medicine, etc.).
  4. Negotiation margin computation arguable from detected anomalies, capped at 25 % cumulative under the anti-bias rule (see below).
  5. Restitution: absolute national 0-100 score (comparable across addresses), sourced and dated anomaly list, explanatory narratives with links to public databases.

Anti-bias rule

Indicator computation and negotiation margin are strictly independent from any affiliate or monetization opportunity. No data signal is weighted to favor a commercial partner. Discount coefficients are documented cell-by-cell (22 public rules with Cairn, INSEE, Géorisques sources) and capped at 25 % cumulative maximum.

Concretely: should NextToYourPlace one day offer partnerships (insurance, moving, services), they would appear in isolated, clearly labeled slots ("proposed by"), never integrated into scoring or narratives.

What we do not measure

For intellectual honesty, here are the acknowledged blind spots of NextToYourPlace V1:

  • Real-time air quality (PM2.5, NO₂). DGAC PEB layer is partial, being extended.
  • Ultra-local retail density. Our minimum mesh is the 7-cell H3 ring (~500 m).
  • Environment subjectivity (view, perceived noise, vibrancy). No subjective indicator replaces an on-site visit.
  • Overseas departments data — V1 covers metropolitan France only.

Verifiability

Each displayed value is verifiable: pages indicate the source name, extraction date and a direct link to the public source database when it offers a citizen consultation interface.

For methodological questions or factual disputes, write to contact@nexttoyourplace.fr with the page reference and disputed value. We publish a correction within 72 business hours.