A homeowner looking to sell their house within six months and an heir who needs to declare an asset to the tax authorities do not require the same valuation. The former seeks a realistic market price, while the latter needs a value that can be contested before the administration. Confusing the two means either paying for nothing or ending up with an unusable figure when it really counts.
DVF and Patrim databases: what you can really extract to estimate your house
Before contacting anyone, start with public data. The Demand for Land Values (DVF) service lists actual sale prices from notarial deeds over the past five years. It includes the price, transaction date, property type, number of rooms, and area.
Patrim, accessible from the personal space on impots.gouv.fr, provides similar information with a finer geographical filter. These two tools use the same sources as notaries, giving them a raw reliability that private estimators lack.
Where it gets tricky: these databases do not provide any information about the interior condition of the sold property or any potential renovations made before the transaction. A median price per square meter calculated from five nearby sales can mask considerable discrepancies if one of the houses was renovated and the other was in ruins. You can estimate your house with Verita Press to better understand how to cross-reference this raw data with the specific characteristics of your property.
In practice, DVF serves as a starting point: you identify comparable transactions within a reasonable radius, calculate a median price per square meter, and then adjust. Without this adjustment, the figure remains a range, not a sale price.
Free estimation by a real estate agency: the real hidden cost
An agency offering a free estimation is not philanthropic. It invests time in visits, writing, and comparisons to secure a sales mandate. This mechanism does not invalidate the quality of the estimation, but it is important to be aware of the bias: the agent has an interest in giving you an attractive price to sign the mandate, even if it means adjusting it downwards later.
To limit this bias, systematically cross-reference two or three opinions from different agencies. A discrepancy of a few percent between estimates is normal. A significant gap indicates either an overly optimistic agent or one who is underpricing to sell quickly.
Regulation of cold calling since August 2026
Since August 11, 2026, a professional can no longer call an individual to offer an estimation without prior consent. Solicitations are limited to four within thirty days, only from Monday to Friday between 10 AM and 1 PM and then between 2 PM and 8 PM. If an agency contacts you outside of this framework, it is a warning sign regarding its seriousness.
This tightening has an unexpectedly positive effect: agencies that comply with these rules document their approach better, with clearer contractual follow-up. This can be used as a selection filter.
DPE and energy audit: their real weight in property estimation
Competitors mention the DPE as an adjustment criterion, but few detail the recent obligations that significantly change the situation for homeowners.
Since 2025, houses rated E in the energy performance diagnosis are subject to a mandatory energy audit before being put up for sale. This obligation previously only applied to properties rated F and G. In practice, this means that a property rated E without an audit cannot be legally put on the market.
The impact on estimation is direct. A buyer who consults the audit sees in black and white the estimated cost of energy renovation works. If this cost is high, they negotiate downwards. You can no longer estimate a house rated E as if the DPE did not exist.
Expanded risk assessment for wildfires
Another new requirement since January 1, 2025: in areas exposed to wildfires, the seller must indicate in the state of risks and pollution (ERP) whether the legal obligation for clearing brush is being respected. An uncleared plot in a risk area can significantly lower the perceived value of the property, even if the house itself is in good condition.
- Check the current DPE rating and anticipate the cost of a potential energy audit before setting a price
- Consult the ERP to identify declared risks (flooding, wildfires, soil pollution) that influence negotiation
- Incorporate the cost of compliance works into the calculation of the net value for the buyer
Paid expertise: when it is justified and when it can be skipped
A real estate expertise conducted by a certified expert produces a detailed report with a substantiated market value. This document has legal weight: it can be presented in the context of an inheritance, divorce, or tax dispute.
For a standard sale between individuals, this expense is rarely necessary. Paid expertise is only justified if the value needs to be contestable before a judge, notary, or tax administration. In all other cases, cross-referencing DVF with agency opinions provides a sufficient result to set a market price.
- Inheritance or donation: the administration can contest an undervaluation, an expert report protects against this
- Contentious divorce: each party can appoint their own expert to avoid disagreements over the property’s value
- Tax audit on a capital gain: a report prior to the sale constitutes a solid supporting document
- Amicable sale without legal stakes: a cross-referenced estimate (DVF, Patrim, two agencies) is generally sufficient
Feedback varies on the value for money of online estimation tools, whose margin of error remains significant compared to a physical visit. These tools provide a first indication, but they do not replace the local agent’s field knowledge or the methodological rigor of a certified expert. The best estimate remains the one that exactly meets the need: a market price for selling, a contestable value for protection.
