You are reading the DPE (Diagnostic de Performance Énergétique — France's Energy Performance Certificate, or EPC) of a flat you intend to buy, and one line catches your eye: a thirteen-character code at the top of the document, labelled "DPE number" or "ADEME number". This is no administrative footnote. It is the unique identifier proving the assessment was registered with ADEME's Observatory (ADEME — France's Environment and Energy Management Agency) — and therefore that it officially exists, is legally binding and verifiable. Without this number, a DPE has no legal value.
This number is also your first tool for spotting a dubious assessment. A DPE missing from the ADEME database, a number that does not match the address, or a document never submitted to the Observatory: all are signals that should stop you before you sign. Here is where to find this number, what it guarantees exactly, and how to use it to verify a DPE's authenticity in a few minutes.
13 characters — that is the exact length of the ADEME number identifying every DPE registered with the Observatory. An assessment without this number, or untraceable in the database, is not legally binding within the meaning of article L.271-4 of the French Construction and Housing Code (CCH).
What this article covers
Where to find the ADEME number on a DPE, what its thirteen characters mean, what registration with the Observatory guarantees legally (binding force, validity), how to verify an assessment's authenticity via the ADEME DPE Observatory and the QR code, and the concrete signals of an unregistered or inconsistent DPE to spot before you buy, sell or let.
The ADEME number: where to find it on the DPE
The ADEME number, sometimes called the "DPE number" or "registration number", is a thirteen-character identifier assigned automatically by ADEME's Observatory platform the moment the assessor files the certificate. Without this filing, no number is generated — and the printed document is merely a draft with no legal force.
On a DPE compliant with the regulatory template in force since the decree of 31 March 2021 (which defines the content and presentation of the DPE for the 3CL-DPE 2021 methodology — France's official EPC calculation method), the number is prominent: it is printed at the top of the first page, in the property identification banner, next to the assessment date and the validity date. Spot it first of all: it is the key that unlocks verification.
What the 13 characters correspond to
The number is a 13-character alphanumeric code assigned by ADEME when the assessment is registered. You do not need to decode its internal grammar: just remember that this code is unique, that it is assigned by the official database and not by the assessor, and that it therefore cannot be "invented" without giving itself away during the online check.
This number is not to be confused with the assessor's certification number, which identifies the professional rather than the assessment itself. Both appear on the DPE: the 13-character number designates this specific DPE, while the certification number attests that whoever carried it out was authorised. Where the same assessor has produced several DPEs for neighbouring units, each assessment keeps its own number: it is this uniqueness that lets you trace a document to a given home and date.
What to check on your DPE: does the 13-character number indeed appear on the first page? Are the assessment date and the validity end date filled in? Do the assessor's name and certification number appear? A missing element here is a first reason for vigilance.
ADEME number and QR code: two ways into the same record
Since 2025, DPEs carry a QR code that links directly to the assessment's official record on the Observatory. The 13-character number and the QR code are two entry points to the same registration: one is entered manually, the other scanned with a smartphone. A recent DPE bearing neither a legible number nor a working QR code should immediately arouse suspicion.
What registration with the Observatory guarantees
The ADEME number is not a mere reference: it embodies the fact that the assessment was submitted to and stored in ADEME's national database. This registration is what gives the DPE its legal value. Three guarantees flow from it.
First, binding force. Since 1 July 2021, the DPE is no longer a purely informative document: it is legally binding, meaning its information engages the seller's or landlord's liability (French Construction and Housing Code, article L.271-4). A buyer or tenant who finds a wrong label can act against the seller, the landlord or the assessor. This binding force assumes a properly established DPE — therefore registered and identified by its number.
Second, official existence and traceability. The number lets any third party — buyer, tenant, notaire, bank — retrieve the assessment in ADEME's database and verify its content without relying on the paper document handed over by the seller. This traceability is what makes documentary fraud detectable: a DPE forged on paper will not match the record registered online.
Third, validity over time. A DPE carried out under the methodology in force is valid for ten years (CCH, article D.126-19, created by decree no. 2021-872 of 30 June 2021). The record held by the Observatory displays the assessment date and the expiry date: the number therefore lets you check the assessment is not out of date. To decide when to renew a certificate that is nearing expiry, see our guide on the choice between redoing your EPC in 2026 or waiting until 2027.
| What the ADEME number guarantees | Detail | Reference |
|---|---|---|
| Registration with the Observatory | The DPE is filed and stored in ADEME's national database | Decree of 31 March 2021 (template and submission) |
| Binding force | The information engages the seller's / landlord's liability | CCH art. L.271-4 (since 1 July 2021) |
| 10-year validity | Assessment and expiry dates shown on the record | CCH art. D.126-19 |
| Calculation method | Assessment established under the 3CL-DPE 2021 method | Decree of 31 March 2021 |
How to verify a DPE's authenticity
Verifying that a DPE is authentic takes a few minutes and needs no account. The principle is simple: confront the paper document with the official record registered at ADEME's Observatory. If the two match, the assessment is real; if they diverge, or if the record is untraceable, you have an inconsistency to clear up.
Step 1 — Find the official record
Go to the ADEME DPE Observatory (observatoire-dpe-audit.ademe.fr). Two entry points are possible: enter the 13-character number shown on the document directly, or search by the property's address. The QR code printed on recent DPEs opens the same record with a single scan. If the number returns no result, that is the strongest signal a DPE was never registered.
Step 2 — Compare the record with the paper document
Once the record is displayed, check its consistency point by point with the document you were given. Does the address match exactly? Are the floor area and the property type (house, flat) identical? Above all: are the energy label (A to G) and the climate label shown online the same as on paper? A divergence on any of these points is a serious inconsistency — without prejudging its cause, it warrants a written request for explanation before proceeding.
What to do now: enter the 13-character number on the ADEME DPE Observatory, then compare the address, floor area, energy label and climate label of the official record with the paper document. Note any difference in writing: it is the basis for a possible dispute.
Step 3 — Verify the assessor
The record names the assessor and their certification body. You can cross-check this against the official directory of certified assessors to confirm the professional held a valid certification on the date of assessment. An assessor who cannot be found, or whose certification had expired, weakens the DPE's value. To go further on reading the document in detail, see our guide on reading an EPC page by page.
Step 4 — Cross-check the QR code and the number
On a recent DPE, the QR code and the 13-character number should both lead to the same record. This is a useful cross-check: scan the QR code, then enter the number manually; if both open an identical registration, the document is consistent with the database. If the QR code leads to a page different from the printed number — or to a site that is not ADEME's Observatory — treat the inconsistency as serious. A QR code is no guarantee in itself: all that matters is what it actually points to, namely the Observatory's official record.
Spotting an unregistered or inconsistent DPE
Most DPEs are perfectly regular. But a few situations should alert you, because they reveal either an absence of registration or an inconsistency between the paper and the official database. Here are the main signals to spot — without crying fraud, but demanding explanations.
The number is missing or untraceable
This is the clearest case. A document presented as a DPE but lacking a 13-character number, or whose number returns no record on the Observatory, is not a legally binding DPE. It may be a draft, an assessment never submitted, or a fabricated document. In every case, refuse to rely on it for a purchase, a sale or a rental, and demand the registered assessment.
The address or floor area does not match
If the online record shows a different address, floor area or property type from the home concerned, the number may point to the DPE of another property. This substitution — deliberate or not — makes the assessment unusable for your home. Check every field before concluding.
⚠️ Warning: a printed DPE can be altered (label, floor area, date) without the Observatory's official record changing. That is precisely why online verification by the 13-character number always takes precedence over the paper document handed over in person.
The label is physically improbable
Beyond administrative authenticity, some labels are inconsistent with the reality of the building. An A or B class on never-renovated old stock heated by direct electric heaters, or a label very different from comparable homes in the same building, are atypical signatures. They prove nothing on their own, but warrant a second look. To identify these situations, see our analysis of the signs of a sloppy or over-rated EPC.
Verify your DPE in seconds
Verify a DPE's authenticity and consistency
Paste the 13-character ADEME number: the OneDpe verification tool confronts the assessment with the Observatory record and with comparable homes, checks the validity and the label, and flags the inconsistencies that warrant a second opinion — before you commit to a purchase, a sale or a rental.
To go further: read an EPC page by page and spot the signs of a dubious EPC.
Conclusion
The 13-character ADEME number is the keystone of a DPE's reliability: it proves registration with the Observatory, conditions the binding force set out in article L.271-4 of the CCH, and lets anyone verify the assessment online. Before any purchase, sale or rental, the useful reflex comes down to three steps: spot the number, find the official record, compare line by line.
An untraceable number, a mismatched address or an improbable label are inconsistencies to clear up in writing before signing. The OneDpe EPC check automates this confrontation and flags the anomalies to clarify, so you can decide with full knowledge of the facts.
