The Secrets.RealEstate Property Price Calculator estimates any French home's value from 18.6 million notarised sale prices — free, in seconds. Here is what that data taught us about what really moves a price, and why we show you a range instead of one seductive number.
What is a French home really worth? The Secrets.RealEstate Property Price Calculator answers from evidence: 18.6 million notarised sale prices (DVF) set the local baseline for any address in France, overseas departments included. On top of that baseline sit factors measured from the market: a sea view adds about 18% to an apartment's value and 15% to a house's, calibrated on a 2026 snapshot of 26,000 French listings. A parking spot is priced by neighbourhood from 386,000 standalone parking sales in the same DVF records — up to €33,000 per spot around the bay of Nice, €25,000 in central Nice, €12,000 in the cheapest tenth of the country. The swing between "just renovated" and "needs renovation" is worth about 13% on an apartment. The result is a realistic range with a stated confidence level, not one seductive number.
Why sold prices and not asking prices? Because asking prices are opinions and sold prices are facts. A notarised DVF record is what a buyer actually paid, registered by the French state — the only ground truth a serious estimate can stand on. Portals that estimate from their own listings inherit every seller's optimism; a model trained on closed transactions does not.
Honesty is the feature we are proudest of. Every estimate states how sure it is: a confidence level and a realistic range, wider where the local data is thin, tighter where thousands of nearby sales agree. And the calculator only prices what it can see — the condition you declare is taken at your word, which is exactly why the range exists.
Using it takes a minute:
- Type an address anywhere in France — overseas departments included.
- Add the few details that move the price: surface, type, condition, floor, view, parking.
- Read the range, the confidence level, and what pushed the estimate up or down.
Free, no account needed, available in six languages. Try it on your own address: https://secrets.realestate/property-price-calculator
