What is a DPE and why should I verify it?

A DPE (Diagnostic de Performance Énergétique) is a mandatory document in France rating a property's energy efficiency from A to G. Verification helps detect errors and fraud, which can impact your property's value and energy bills.

What is the 3CL method used in the DPE simulation?

The 3CL method (Calculation of Conventional Housing Consumption) is the official French calculation method since the 2021 DPE reform. It accounts for insulation, heating, ventilation and climate zone to determine real energy consumption.

What subsidies are available for energy renovation works?

Main subsidies include MaPrimeRénov' (government aid based on income), CEE certificates (energy saving certificates), Éco-PTZ (zero-interest loan up to €50,000), and reduced VAT at 5.5%. These can be combined, within a cap that depends on your income bracket.

Are these DPE tools free?

You can start for free, with no account needed to try the tools. OneDpe runs on a freemium model (Free, Premium, Pro): the basics are free, while advanced usage and higher limits depend on your plan. They use official ADEME data and the 3CL-2021 calculation method.

What are "passoire thermique" properties?

Properties rated F or G are called "thermal sieves" (passoires thermiques). G-rated properties have been banned from rental since January 2025, and F-rated ones will follow in 2028. Renovation is essential for landlords.

Free DPE toolkit

Understand, simulate and improve your DPE

7 tools powered by the ADEME database (14M+ diagnostics) and the official 3CL-2021 method. Free to start, no account needed to try.

Verify my DPE Simulate my label

14M+ ADEME diagnosticsOfficial 3CL-2021 methodFree to start

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DPE Verification

Check your diagnostic's reliability and automatically detect anomalies.

40+ technical checks
Reliability score /100
Fraud detection

Verify my DPE

Where does your home sit on the energy scale?

Analyze

Understand and validate an existing DPE

DPE Visit Checklist

3/mo

Gather the right documents before the assessor’s visit and avoid penalising default values.

Checklist by property typePersonalised by addressCondominium cross-reference

Prepare my visit

DPE Summer Comfort

Free

Test your home’s summer comfort indicator (annex 9): solar protections, roof, inertia, dual-aspect.

Verdict + A-G scoreLocal climate + 2030 projectionUseful works and subsidies

Test my summer comfort

Interactive DPE Map

Free

Explore diagnostics on a map and spot the thermal sieves in your neighborhood.

14M+ ADEME diagnosticsFilter by labelArea statistics

Explore the map

Find Property by DPE

Free trial

Find a listing's exact address using the ADEME database.

14M+ diagnosticsSearch by valuesGoogle Maps link

Find a property

Simulate

Project your energy label

DPE Simulation

3/mo

Estimate your home's energy label with the official 3CL-2021 method.

Official 3CL methodEnergy costs2026 coefficient

Simulate my DPE

My DPE in 2026

Free

See if your label changes with the new 1.9 electricity coefficient.

Coefficient 2.3 → 1.9850,000 homes reclassifiedInstant result

Simulate my DPE 2026

Act & add value

Fund your works and negotiate the price

Renovation Works

1/mo

Calculate your MaPrimeRénov' 2026, CEE and Éco-PTZ aids and label gain.

MaPrimeRénov' aidsCEE & Éco-PTZEstimated label gain

Calculate my aids

DPE Decote Calculator

Free trial

Estimate a property's price decote by its label (French Notaires 2024 study).

Notaires 2024 sourceDecote by property type10-year energy cost

Calculate decote

Estimate my property’s value

How much is your home worth? Get a free estimate based on real transactions, with the € impact of its DPE label — on our sister site Mon Simulateur Immobilier.

monsimulateurimmobilier.fr

Estimate my property

Find a property by its DPE

Find the exact address of a property seen in a listing from its DPE data, cross-referenced with the 14M+ ADEME database.

Open the tool

The 3CL EPC method explained simply

The 3CL-DPE 2021 method explained for everyone: a conventional calculation (not a measurement), the five uses, primary vs final energy, and why the EPC differs from your bills.

How to prepare for your DPE inspection: the document checklist

Insulation, glazing, heating, condominium: without proof, the assessor applies penalising default values. The full checklist of documents to gather before your DPE inspection.

EPC and summer comfort: why your C-rated home can be unbearable in a heatwave

The EPC label measures winter, not summer. 2021 indicator, "summer comfort letter" announced in 2026, 5.5% VAT on air con, at-risk homes, works and subsidies: what to check on your certificate.

Sources

ADEME database (14M+ diagnostics) · Official 3CL-2021 method · French Notaires 2024 study · 2026 official rates

Understand, simulate and improve your DPE

DPE Verification