FAQ

Where does the data come from?

Sale prices come from DVF (“Demandes de valeurs foncières”), the record of notarised property sales published as open data by the French tax authority (DGFiP) via Etalab. Address search uses the Base Adresse Nationale. Map tiles are OpenFreeMap / OpenStreetMap contributors. Neighbourhood signals (natural disasters, industrial sites, soil risk) come from Géorisques, published by the French Ministry of Ecology. None of this data is scraped or purchased — it's all official public data, refreshed directly from the source.

How is the price estimate calculated?

We compare the property you search to real notarised sales (from DVF) of similar properties sold nearby — taking into account property type, surface, location, and how recent each sale is. The more comparable sales available, and the more recent they are, the more reliable the estimate, which is why the search area and the number of sales considered vary from one address to another. The estimate shown is a range (low, median, high) computed from that comparable set. We don't publish the exact formula, to keep the methodology from simply being copied.

How should I read the verdict?

The verdict compares the asking price per m² to the estimated market median: Good deal (more than 5% below market), Fairly priced (within about 7% above market), Slightly above market (7–15% above), and Overpriced (more than 15% above). It's a relative signal, not a certificate — always read it alongside the sample size and radius shown under the estimate: a verdict based on 40 sales within 300 m is much sturdier than one based on 8 sales within 5 km.

Is the suggested offer the same as the market estimate?

No. The market estimate is a statistical range; the suggested offer is a genuine negotiation starting point, adjusted for how large the gap to asking price is, whether the local price trend is rising or falling, and how spread out comparable sales are. It's part of full access (see Pricing), specifically because it reflects judgment, not just arithmetic you could reconstruct from the free estimate.

Does the price include notary fees and taxes?

No — neither the historical sale prices nor our estimate and suggested offer include notary fees. DVF's recorded price is the value of the property itself, as declared in the deed. On top of whatever price you agree, French law requires the buyer to also pay notary fees and registration duties (mostly a tax collected on behalf of the State and the local département, not the notary's own fee) — typically around 7–8% of the price for an existing property and 2–3% for a new-build. The exact rate depends on your département and changes from time to time (a number of départements raised their rate in 2026), so always confirm the precise figure with your own notaire before budgeting your offer.

What other checks should I do before making an offer?

OffreJuste tells you whether the price is fair — it can't replace seeing the property. Before committing, you should still: visit in person (light, noise, layout, neighbours); review the mandatory technical diagnostics (DPE energy rating, asbestos, lead, gas and electrical safety, termites where relevant); for an apartment, check the co-ownership's finances, any planned major works, and outstanding charges; check local planning rules (PLU) and any easements; and have the sale agreement reviewed by a notaire. Confirming your financing (a mortgage broker or your bank) before you offer also strengthens your negotiating position.

Is this a formal valuation (avis de valeur)?

No. OffreJuste provides a statistical estimate based on past public sales — useful to negotiate with confidence, but it is not a professional appraisal, a legal opinion, or financial advice, and it doesn't account for condition, floor, view, exposure, or renovation quality, all of which move the real price.

Why does the sales history only go back to 2021?

The government's DVF file is a rolling window covering roughly the last 5 years — older vintages are removed from the official source as new ones are published. We're planning a one-time historical harvest from archived DVF releases to extend this back to 2014, which would also unlock a powerful negotiation fact: what the seller themselves paid for the property.

Why do some addresses show no data at all?

Alsace-Moselle (Bas-Rhin, Haut-Rhin, Moselle) and Mayotte use a separate land registry system and aren't covered by DVF in any year. If your search returns no sales, this is very likely why — it isn't a bug.

What are "neighbourhood signals"?

Official, dated indicators from Géorisques for the last 5 years: recognised natural disasters (floods, drought-related subsidence), nearby Seveso industrial sites, point-level clay shrink-swell exposure (a cause of cracking), and radon potential. These are the kind of facts a notaire discloses late in a sale — we surface them before you make an offer.

Why are some comparable sales locked?

The verdict, market estimate, price trend, and neighbourhood signals are free for every search. A handful of the closest comparable sales and one sale at the exact address are also shown free, as a sample. The complete list of comparable sales, the full sale history at the address, and the downloadable negotiation dossier are available with a one-time unlock for that property or a subscription — see Pricing.

Are my searches and data private?

We collect the minimum needed to run the service, and anonymous searches aren't linked to anyone. See our privacy policy for full details, including how to delete your account and data.

What features are still being built?

OffreJuste is under active development. Planned next: energy performance ratings (DPE) shown per address, a buyer-side mortgage broker connection, renovation quotes from independent contractors, the historical sales harvest back to 2014, and a browser extension that overlays a verdict directly on listing sites. None of these are live yet — if you'd like to be notified when they launch, use the sign-up prompts on the relevant sections, or get in touch.

Something else?

Use our contact form — we read every message and reply within 2 working days.