A portal that displays thousands of real estate listings does not guarantee their reliability. The real sorting begins with technical checks that most search interfaces do not facilitate, starting with the regulatory compliance of the displayed diagnostics.
Validity of the DPE in real estate listings: the filter that portals do not apply
Since January 1, 2025, DPEs completed before July 1, 2021, are invalid, even if their theoretical validity period has not expired. We still regularly observe listings that include an old diagnostic without an update. A property displayed with a DPE prior to this date should trigger an immediate verification reflex.
For the purchase of an apartment, the question does not stop at the individual DPE. Since January 1, 2026, collective DPE is mandatory for all residential condominiums, regardless of their size. Requesting this document allows for cross-referencing the data of the unit with the overall performance of the building and anticipating any works voted on in the general assembly.
In the rental segment, the constraint is even more direct. Properties classified as G are now subject to the rental ban provided by the Climate and Resilience Law. A rental listing displaying a DPE classified as G must undergo a verification of the legal status of the lease. If the owner proposes a new lease, the rental is generally blocked.
We recommend considering the DPE not just as a simple indicator of thermal comfort but as a filter for the reliability of the listing itself. A listing without a valid DPE or with an expired diagnostic signals, at the very least, a lack of rigor from the publisher.
Risk status and regulatory mentions: check what the listing omits
Real estate portals structure their filters around price, area, and location. Regulatory information on natural, mining, or technological risks often takes a back seat. For properties located in exposed areas, the listing must, however, include this mention.
It is possible to supplement or cross-check this control using the public tool ERRIAL, which allows obtaining a risk status based on the property’s address. This cross-referencing is particularly useful when the listing remains vague about the housing environment or when the seller does not spontaneously mention easements.
When comparing properties across multiple platforms, the presence or absence of this regulatory information is a reliable indicator of the seriousness of the listing. A portal that requires the entry of this data from its advertisers mechanically filters out some of the approximate offers. To access real estate on Mr Annonce, the process remains the same: systematically check the completeness of the displayed information before making contact.
Points to check before contacting an advertiser
- The date of the DPE: a diagnostic prior to July 1, 2021, is no longer valid since January 2025, regardless of what the listing indicates
- The mention of the energy class and climate class (GHG): their absence in a sale or rental listing constitutes a breach of legal obligations
- The risk status: verifiable independently via ERRIAL, it allows for the detection of voluntary or involuntary omissions
- The consistency between the announced area and the legal living area (Carrez law for a condominium unit)
Real estate listings between individuals: spotting scam signals
The market between individuals presents a specific risk. The absence of a professional intermediary removes a first level of verification. Rental scams remain common on generalist platforms, with recurring patterns: request for a transfer before the visit, identity theft of the owner, photos taken from other listings.
An effective reflex is to perform a reverse image search of the listing photos. If the same visuals appear on several sites with different locations or prices, the listing is fraudulent.
We observe that portals specializing in real estate generally apply stricter controls than general classified ad sites. The verification of the advertiser’s identity, the obligation to provide diagnostics, and content moderation vary greatly from one platform to another.
What distinguishes a reliable portal from a simple aggregator
A portal that requires the entry of the DPE number, displays regulatory mentions, and verifies the identity of the publisher offers a safer framework. Conversely, a site that publishes a listing without any diagnostic or legal mention exposes the user to potentially non-compliant or even fictitious offers.
The free publication is not an indicator of quality. What matters is the level of requirements imposed on the advertiser at the time of submission.
Cross-checking sources to enhance your real estate search
No portal centralizes the entirety of the market. Exclusive mandates only appear on the website of the mandating agency. Some properties are only advertised on regional platforms or specific networks.
The most effective strategy is to combine several types of sources:
- National portals with high traffic, which offer a large volume but variable listing quality
- Real estate agency websites, where listings are generally more complete and verified by a professional
- Specialized classified ad platforms, which position themselves between generalist and professional portals
This cross-checking allows for the identification of inconsistencies. A property listed at a price significantly lower than the local market on a single platform, without diagnostics and with low-quality photos, accumulates warning signals.
Checking the consistency of a listing across multiple sources remains the best anti-scam filter available to an individual. The time invested in this step avoids unnecessary trips and real financial risks, whether the project concerns a purchase, a rental investment, or a simple rental.
