Real Estate · data.gouv.fr

Detect undervalued real estate properties

Our algorithm cross-references 5 public data sources — Cadastre, DPE, DVF, SIRENE and OpenStreetMap — to calculate an opportunity score from 0 to 100 per property. Free score, full report on request.

Free score Full report €49 · One-time payment, no subscription.

Free · result in seconds · cross-referencing Cadastre + DPE + DVF + SIRENE

By launching the diagnostic, you will receive your score by email. One-click unsubscribe · privacy policy.

From data to decision

The French real estate market generates millions of public data points every year. Most investors only leverage a fraction of this information. Property Score automates the cross-analysis of this data to surface opportunities the market hasn't yet spotted.

1

Data

Automatic retrieval from data.gouv.fr: Cadastre, DPE, DVF, SIRENE and OpenStreetMap.

2

Scoring

Weighted multi-criteria algorithm that computes a score from 0 to 100 for each transaction.

3

Opportunities

Identification of undervalued properties with a clear verdict (OPPORTUNITY, ATTENTION, NEUTRAL, PASSED).

4

Decision

Dashboard, interactive map, filters, exports and email alerts to take action.

Five data sources, one analysis

📊

Price undervaluation

Compares each transaction to its municipality's median price to detect properties sold below market.

⚡

Energy potential

Analyzes the DPE to identify properties with strong renovation potential — bonus if the property is better than the neighborhood average.

📍

Geographic proximity

6 OpenStreetMap layers: transport, shops, schools, healthcare, culture and green spaces. Weighted by POI type.

🏪

Local ecosystem

Business density and diversity (SIRENE): a vibrant neighborhood = better resale potential.

🗺️

Interactive dashboard

Opportunity map, property rankings, score radar by component, municipality comparison.

🔌

Documented REST API

FastAPI endpoints with filters (municipality, verdict, min score), automatic Swagger documentation.

How it works

  1. The pipeline automatically retrieves DVF, DPE, cadastral, SIRENE and OSM data for targeted municipalities.
  2. The scoring algorithm calculates a score from 0 to 100 per transaction across 5 weighted dimensions.
  3. You explore the results via the dashboard (interactive map, filters, rankings) — free of charge.
  4. The full report (detail of each dimension, sourced data, CSV export, email alerts) is €49 incl. VAT.

Open source code (MIT license), data from data.gouv.fr, cadastre.data.gouv.fr and OpenStreetMap.

Pricing

Free diagnostic, detailed report on demand

Run the diagnostic for free, no sign-up. The detailed report unlocks at the end, in a single payment — no subscription.

Free score

€0

No sign-up, in a few minutes.

  • Your opportunity score out of 100
  • The 5 dimensions (energy, price, surface, ecosystem, geography)
  • The ranking of the best opportunities
Start the free diagnostic →
Most complete

Full report

€49

One-time payment, no subscription.

Everything in the free score, plus:

  • The full detail of each dimension
  • The sourced data (Cadastre, DPE, DVF, SIRENE, OSM)
  • CSV export of opportunities
  • Email alerts on your criteria
Get the full report — €49 →

The report unlocks at the end of the free diagnostic.

Frequently asked questions

Property Score: your questions

Data sources, scoring algorithm, geographic coverage, free tier — the essentials before you get started.

What is the Property Score?

It's a tool that cross-references French public data — Cadastre, DPE (energy performance), DVF (property transactions), SIRENE (local economic fabric) and OpenStreetMap (proximity of services) — to calculate an opportunity score from 0 to 100 per property. It identifies properties undervalued relative to the local market.

What data do you use?

Five public data sources: the Cadastre (parcels and buildings), Energy Performance Diagnostics (ADEME), Property Value Requests (DVF, last 5 years), the SIRENE business register (INSEE) and OpenStreetMap for nearby points of interest (transport, shops, schools, healthcare, green spaces).

How is the score calculated?

The score (0–100) is a weighted average of five dimensions: energy potential (20%), price undervaluation (25%), surface-to-price ratio (10%), local economic ecosystem (15%) and geographic proximity (30%). A score ≥ 70 signals a strong OPPORTUNITY, ≥ 50 warrants attention.

Which municipalities are covered?

The tool covers French municipalities for which DVF, DPE and cadastral data are available. The initial launch covers Paris, Lyon and Marseille. We are gradually expanding coverage.

Is the score free?

Yes. The opportunity score and the 5 dimensions are free. The full report — detail of each dimension, sourced data, CSV export of opportunities and personalized email alerts — is €49 incl. VAT, one-time payment.

How is this different from a traditional property simulator?

Traditional simulators estimate the value of a property you've already identified. Property Score does the opposite: it scans all recent transactions to identify properties selling below the median price of their municipality, taking into account energy quality, surface area and neighborhood attractiveness. It's an opportunity detection tool, not an estimation tool.