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Mandatory Property Diagnostics in France: List and Validity

When selling or renting out a property in France, transparency is key to securing the transaction and protecting both parties. The Dossier de Diagnostic Technique (DDT - Technical Diagnostic File), effectively a health record for the property, compiles all the technical inspections made mandatory by French law. Whether you are a landlord, a seller, or a foreign resident navigating the subtleties of French real estate law, mastering these diagnostics is essential to avoid financial disputes and legal penalties. This comprehensive guide presents the exhaustive list of mandatory diagnostics, their validity periods, average costs, and the key steps to successfully complete your procedures in full compliance.

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The Dossier de Diagnostic Technique (DDT): Legal Framework and Stakes

The Dossier de Diagnostic Technique (DDT) is governed by Article L. 271-4 of the Code de la construction et de l'habitation (Construction and Housing Code) for sales, and by Article 3-3 of Law No. 89-462 of 6 July 1989 for rentals. This file must be appended to the promesse de vente (preliminary sales agreement) or the acte authentique (final deed of sale), or to the contrat de bail (tenancy agreement).

The objective of this regulation is threefold:

Protect the buyer or tenant by informing them about the actual condition of the property (presence of hazardous materials, safety of installations, energy performance).
Protect the seller or landlord by exempting them from the warranty against vices cachés (hidden defects) for the elements inspected.
Guarantee public health and environmental safety on a national scale.

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Detailed List of Mandatory Property Diagnostics

Not all properties are subject to the same obligations. The required diagnostics depend on the building's year of construction, its geographical location, and the age of its installations.

1. The Diagnostic de Performance Énergétique (DPE)

What is it? The Diagnostic de Performance Énergétique (DPE - Energy Performance Certificate) assesses a property's energy consumption and greenhouse gas emissions, assigning it a rating from A (highly energy-efficient) to G (highly energy-consuming).
When is it mandatory? For all sales and rentals of heated properties.
Validity period: 10 years. Please note: DPEs carried out between 1 January 2013 and 31 December 2017 are no longer valid as of 1 January 2023. Those carried out between 1 January 2018 and 30 June 2021 are valid until 31 December 2024.
Legal framework: Article L. 126-26 of the Code de la construction et de l'habitation.

2. The Constat de Risque d'Exposition au Plomb (CREP)

What is it? The Constat de Risque d'Exposition au Plomb (CREP - Lead Exposure Risk Assessment) measures the concentration of lead in paint and coatings to prevent lead poisoning.
When is it mandatory? For all properties (sale and rental) built before 1 January 1949.
Validity period: Unlimited if lead is absent or if the concentration is below 1 mg/cm². If lead is detected above this threshold: 1 year for a sale, 6 years for a rental.

3. The Asbestos Report (État d'amiante)

What is it? It checks for the presence of materials containing asbestos, which is highly toxic to the respiratory system.
When is it mandatory? For the sale of all properties for which the building permit was issued before 1 July 1997. For rentals, the landlord must be able to make it available to the tenant upon request (except for detached houses).
Validity period: Unlimited if the diagnostic is negative and was carried out after 1 January 2013. If asbestos is detected, periodic inspections (every 3 years) or removal work may be required.

4. The Electrical Installation Report (État de l'installation intérieure d'électricité)

What is it? It assesses the safety of electrical installations to prevent electrical shocks and fire hazards.
When is it mandatory? For sales and rentals of properties where the electrical installation is more than 15 years old.
Validity period: 3 years for a sale, 6 years for a rental.

5. The Gas Installation Report (État de l'installation intérieure de gaz)

What is it? It checks the compliance and safety of gas installations (boiler, piping, ventilation) to prevent leaks and carbon monoxide poisoning.
When is it mandatory? For sales and rentals of properties where the gas installation is more than 15 years old, or if the last certificate of compliance is more than 15 years old.
Validity period: 3 years for a sale, 6 years for a rental.

6. The Termite Report (État relatif à la présence de termites)

What is it? It reports the presence of wood-boring insects that degrade wood and threaten the building's structure.
When is it mandatory? Only for sales, if the property is located in an area declared infested by an arrêté préfectoral (prefectural decree).
Validity period: 6 months maximum (due to the speed at which these insects spread).

7. The Environmental Risks and Pollution Report (État des Risques et Pollutions - ERP)

What is it? The État des Risques et Pollutions (ERP) provides information on natural hazards (floods, earthquakes), mining, technological risks, as well as coastline erosion and soil pollution.
When is it mandatory? For all sales and rentals located in areas covered by a risk prevention plan or in seismic zones.
Validity period: 6 months maximum (must be updated if the municipality's situation changes before signing).

8. The Noise Diagnostic (ENSA)

What is it? The État des Nuisances Sonores Aériennes (ENSA - Airport Noise Exposure Report) provides information on exposure to airport noise.
When is it mandatory? For sales and rentals located in a noise zone defined by a plan d'exposition au bruit (PEB - noise exposure plan).
Validity period: 6 months maximum.

9. The Non-Collective Sanitation Diagnostic (Diagnostic assainissement non collectif)

What is it? It checks the proper functioning of autonomous wastewater treatment installations (septic tanks).
When is it mandatory? Only for the sale of detached houses or properties not connected to the public sewage network (tout-à-l'égout).
Validity period: 3 years. In the event of non-compliance, the buyer must carry out compliance work within one year of the sale.

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Summary Table: Validity and Obligations

| :--- | :---: | :---: | :--- | :--- |

| DPE | Yes | Yes | 10 years (see exceptions) | All heated properties |

| Gas | Yes | Yes | 3 years (sale) / 6 years (rental) | Installation older than 15 years |

| ERP | Yes | Yes | 6 months | Risk zone (prefectural decree) |

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Practical Steps: Carrying Out Your Diagnostics Step-by-Step

Getting diagnostics done is not something to be improvised. Here is the step-by-step process to secure your transaction:

1. Identify the required diagnostics: Analyze your property's construction date, the age of its gas and electricity installations, and consult the town hall (mairie) or prefecture to find out about any prefectural decrees (termites, ERP).

2. Select a certified surveyor: You must hire an independent and impartial professional surveyor (diagnostiqueur). This surveyor must hold certifications issued by a body accredited by the COFRAC (Comité français d'accréditation) and have professional indemnity insurance (assurance responsabilité civile professionnelle - RCP). You can verify their credentials on the official directory of the Ministry of Ecological Transition.

3. Prepare for the professional's visit: To facilitate their work and obtain accurate results (especially for the DPE), gather useful documents: invoices for energy-related works, previous diagnostics, property plans, heating consumption bills (if applicable), and technical equipment descriptions.

4. Receive and analyze the reports: Once the diagnostics are completed, read the conclusions carefully. If anomalies are detected (for example, a dangerous electrical installation or accessible lead), evaluate whether it is appropriate to carry out corrective work before selling or renting out the property.

5. Include the DDT in the legal documents: Send the complete DDT to your notary (notaire) for a sale, or append it directly to the tenancy agreement for a rental.

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Costs and Budget Examples

The rates for property diagnostics are not regulated by the state; they are set freely by professionals. Prices vary according to the size of the property, its geographical location, and the number of diagnostics to be carried out. It is highly recommended to order a "pack" grouping all the necessary diagnostics, which significantly reduces the overall bill.

On average, the rates observed on the French market are as follows:

Single DPE: Between 100 € and 250 €.
Complete pack (sale of a 2-bedroom apartment built in 1980): Between 300 € and 500 €.
Complete pack (sale of an old detached house with a septic tank): Between 500 € and 800 €.

Practical Example 1: Marie rents out an apartment in Paris

Marie is renting out a 1-bedroom apartment of 45 m² located in Paris, built in 1965. The electrical installation was completely redone 8 years ago.

Mandatory diagnostics: DPE (mandatory for all), ERP (Paris is in seismic zone level 1 and subject to other risks), and the CREP is not mandatory because the building was constructed after 1949. The electrical report is not required because the installation is less than 15 years old.
Estimated cost of the diagnostic pack: Around 180 €.
The stakes: If Marie fails to provide the DPE in her rental listing, she faces an administrative fine of up to 3,000 €.

Practical Example 2: Jean sells a house in Gironde

Jean is selling a 120 m² house built in 1930 in Gironde, equipped with a gas heating system dating from 2005 and a septic tank. Gironde is subject to a prefectural decree regarding termites.

Mandatory diagnostics: DPE, Asbestos (built before 1997), Lead (built before 1949), Gas (installation older than 15 years), Termites (risk zone), ERP, and Non-Collective Sanitation.
Estimated cost of the diagnostic pack: Around 650 €.
The stakes: If Jean does not provide the termite diagnostic and the buyer discovers an infestation after the sale, Jean will not be able to exempt himself from the warranty against hidden defects. He could be ordered to cover the entire cost of the treatment and roof timber repairs, which can sometimes amount to tens of thousands of euros.

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Mistakes to Avoid

Hiring an uncertified surveyor: Using the services of a friend or a professional without valid certifications or professional indemnity insurance makes the diagnostics legally null and void. In the event of a dispute, your civil and criminal liability will be engaged.
Using expired diagnostics: A diagnostic whose validity date has passed at the time of signing the preliminary sales agreement or the lease is considered non-existent. Check dates scrupulously, especially for the ERP and termites, which only last 6 months.
Neglecting the legally binding nature of the DPE: Since 1 July 2021, the DPE is legally binding (opposable) against the seller or landlord. This means that a tenant or buyer can hold you liable if the actual energy performance of the property does not match the displayed rating, and demand a reduction in rent or the sale price.
Failing to mention the DPE rating in the property listing: The law requires the energy rating (A to G) and climate rating to be displayed visibly as soon as the property listing is published (whether online or offline). Failure to comply with this obligation is punishable by a fine of 3,000 € for an individual.

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FAQ (Frequently Asked Questions)

Who has to pay for the property diagnostics?

In principle, the entire cost of preparing the Dossier de Diagnostic Technique (DDT) is borne exclusively by the seller or the landlord. The buyer or tenant does not have to pay anything for these checks. The only exception concerns the collective sanitation diagnostic, which can sometimes be covered by the municipality, or any counter-diagnostics requested by the buyer at their own expense.

What happens if a mandatory diagnostic is missing during a sale?

If the DDT is not complete at the time of signing the final deed of sale, the seller cannot exempt themselves from the warranty against hidden defects. If the buyer discovers a defect (presence of asbestos, dangerous electrical installation) that should have been mentioned in the missing diagnostic, they can take the matter to the Tribunal judiciaire (Judicial Court) to request a significant reduction in the sale price, or even the outright cancellation of the transaction.

Can a tenant demand repairs following the diagnostics?

For rentals, the property must meet the decency criteria defined by the decree of 30 January 2002. If the electricity or gas diagnostic reveals anomalies classified as dangerous, or if the CREP highlights degraded lead paint, the landlord is legally obliged to carry out compliance work before the tenant moves in, or during the lease if the problem arises during the tenancy.

Can a DPE ban a property from being rented out?

Yes, the "Climate and Resilience" law provides for the gradual exclusion of "thermal sieves" (passoires thermiques) from the rental market. Since 1 January 2023, a property can no longer be offered for rent if its final energy consumption exceeds 450 kWh/m²/year. Furthermore, properties rated G are banned from being rented out since 1 January 2025, properties rated F will be banned in 2028, and properties rated E in 2034.

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In Summary

The DDT is mandatory: It must be appended to any sales agreement or tenancy contract, under penalty of civil and financial sanctions.
Validity varies: Validity periods range from 6 months (termites, ERP, noise) to unlimited (lead and asbestos if negative).
The DPE is central: Now legally binding, the DPE determines the energy decency of a property and can ban it from being rented out if it is classified as a thermal sieve.
Certified professionals required: All diagnostics (except the ERP) must be carried out by a COFRAC-certified surveyor with valid professional indemnity insurance.
Owner's liability: The absence or inaccuracy of diagnostics exposes the owner to demands for price reductions, contract cancellation, or administrative fines.

Legal information for guidance only, not personalised legal advice. For your specific situation, ask your question free of charge on AvocatAI — answers based on French law, in your language.

Content reviewed by the AvocatAI legal editorial team

This article is provided for information only and is not legal advice. Consult a lawyer for advice tailored to your situation.