When you decide to sell a property in France, questions around the diagnostic immobilier obligatoire vente – the mandatory property reports for a sale – are often among the first to arise: which reports you really need to provide and in which order. The rules around each diagnostic can feel technical and stressful, especially when the risk is a delayed or even cancelled sale. In reality, a clear plan for your mandatory property diagnostics is one of the best ways to protect yourself and reassure buyers. In this guide, you will find every compulsory report, how long each one is valid, and how to avoid classic pitfalls so you can sell with complete peace of mind, from the first estimate right through to the signing at the notary.
Diagnostic immobilier obligatoire vente : la checklist complète des diagnostics immobiliers obligatoires pour une vente
Reading time: ~11 min
- Table of contents
- What is included in a mandatory property survey file
- The three diagnostics that always apply
- Your mandatory diagnostics checklist
- Specific rules for individual houses and apartments
- How to organise your diagnostics step by step
- To do and not to do with your diagnostics
- How an exclusive mandate simplifies your sale and diagnostics
- FAQ about mandatory diagnostics
What is included in a mandatory property survey file
Overview of the Dossier de Diagnostic Technique (DDT)
In France, all compulsory surveys for a sale are grouped in one file called the Dossier de Diagnostic Technique (DDT). This file gathers every diagnostic that applies to your property and must be attached first to the preliminary sales agreement and then to the final deed signed at the notary.
If one mandatory diagnostic is missing or out of date, the buyer can renegotiate the price, delay the signature or, in some cases, cancel the sale. The seller can also be held legally responsible if a hidden risk is revealed later. The DDT is meant to inform the buyer, not necessarily to oblige renovation works. Some reports only describe the condition of the property, while others can trigger obligations, such as upgrading a septic tank within a defined period.
The three diagnostics that always apply
Energy performance certificate (DPE)
The DPE evaluates the energy consumption and climate impact of the property and assigns a rating from A to G. This rating must appear in every sales advertisement. The DPE is generally valid for ten years, but reports made before July 2021 lose validity in 2025. A poor rating can influence negotiations, while a good one is a strong selling point.
Risk and pollution report (ERP)
The ERP informs buyers about natural and technological risks such as floods, seismic areas, radon exposure or nearby industrial sites. It must be dated less than six months before the preliminary agreement. If the deadline passes, an updated report is required.
Carrez surface for co-owned property
For apartments and any lot in co-ownership, the seller must provide the official Carrez surface. The certificate has no expiry date unless the interior layout changes, in which case a new measurement is recommended.
Your mandatory diagnostics checklist
How to read and use this checklist
| Diagnostic | Properties concerned | Validity | Possible consequences if missing |
|---|---|---|---|
| Asbestos | Permit before July 1997 | Unlimited (none found) / 3 years (asbestos present) | May require management or removal of dangerous materials |
| Lead exposure (CREP) | Residential buildings before 1949 | 1 year (lead present) / Unlimited (none found) | Seller liability if lead risk causes harm |
| Electricity installation | Systems older than 15 years | 3 years | Sale can be blocked; seller liable in case of accident |
| Gas installation | Systems older than 15 years | 3 years | Similar to electricity—legal issues if incident occurs |
| Non-collective sanitation | Houses with private systems (septic tank) | 3 years | Buyer must upgrade within 1 year if non-compliant |
| Termites | Properties in zones defined by prefectural decree | 6 months | High dispute risk if infestation is undisclosed |
You will not always need every diagnostic. A recent apartment with collective sanitation may avoid lead or septic tank reports, while an older rural house with a septic tank in a termite zone will require almost the full list. Discuss your specific situation early with a professional and ensure your notary receives all reports well before signing.
Specific rules for individual houses and apartments
Individual houses
A detached or semi-detached house always needs a DPE. Houses rated E, F or G require an additional energy audit that proposes renovation scenarios and estimates the potential rating gain; from early 2025, this also applies to E-rated homes. Age-related diagnostics (asbestos, lead, electricity, gas) apply according to construction date and installations. If the house is not on mains drainage, a non-collective sanitation report is mandatory. In some areas, a termite inspection with a short validity period is also required.
Apartments in co-ownership
The basic package for an apartment includes a DPE, ERP and Carrez measurement. Age-related diagnostics apply as for houses. The building may have a collective DPE and, if built before certain dates, a Dossier Technique Amiante (building-level asbestos file). The Carnet d’Information du Logement gathers technical information and past works, offering buyers extra reassurance.
How to organise your diagnostics step by step
Planning your diagnostic appointments
- Start with an assessment of your situation with your agent or a diagnostic company to confirm which reports apply.
- Group the operator’s site visits into one or two slots to collect all measurements efficiently.
- Schedule the ERP and, if applicable, the termite report close to the planned date of the preliminary agreement because of their short validity.
- Check each report immediately upon receipt—address, lot number, surface and validity dates—and request corrections right away if needed.
- Send the complete DDT to your notary and agent so it can be annexed to the preliminary contract without delays.
If you are working with Riviera King Real Estate, the team coordinates the entire sequence, reminds you of upcoming expiry dates and helps you explain the content transparently during visits.
To do and not to do with your diagnostics
How to use this good practices table
| To do | Not to do |
|---|---|
| Choose certified professionals with valid insurance | Order diagnostics at the last minute |
| Keep originals and digital copies in one folder | Hide negative information (e.g., asbestos, poor DPE) |
| Use results to prepare your selling argument | Assume old diagnostics are still valid without checking |
| Ask for clarification of technical terms you don’t understand | Promise works you are unsure you will complete |
Transparency is often your best protection. Buyers may accept a less favourable DPE or the presence of asbestos if everything is clearly explained and reflected in the price and conditions of the sale.
How an exclusive mandate simplifies your sale and diagnostics
Impact of an exclusive mandate on your diagnostics
Signing a single exclusive mandate with a trusted agency provides one dedicated contact, a clear strategy and stronger commitment from your agent. On the French Riviera, Riviera King Real Estate operates within MLS Côte d’Azur, giving your property broad exposure to more than 2,000 professionals while you keep one advisor coordinating visits and feedback. This accelerates the sale and ensures tight control of the information given to buyers, including diagnostics. To explore this option, request an exclusive valuation at sale estimate.
FAQ about mandatory diagnostics
Who pays for the diagnostics when selling a property?
In France, the seller orders and pays for all compulsory diagnostics, whether or not an intermediary is involved. The cost of the DDT is part of the selling expenses, similar to agency fees or minor works.
Do I have to carry out renovation works if a diagnostic is negative?
Most diagnostics are informative. A poor DPE rating or an electricity report noting anomalies does not automatically oblige you to do works, though these factors may influence negotiations and some banks increasingly consider energy performance. In specific cases—such as non-compliant individual sanitation—the law does impose upgrading within a fixed period after the sale.
Can a missing diagnostic really cancel a sale?
Yes. The absence of a mandatory diagnostic or an out-of-date report can justify delaying or cancelling the transaction, especially if significant risk information is missing. Buyers may also request a price reduction or additional conditions. Notaries therefore check the presence and validity of the DDT before signing.
How long in advance should I plan my diagnostics?
You can contact a diagnostic company as soon as you decide to sell. Most reports remain valid for several years, so you can anticipate them, except for the ERP and certain parasite diagnostics with shorter validity. Your agent can advise on ideal timing based on your schedule.
Conclusion: turning mandatory diagnostics into an asset for your sale
Preparing your mandatory diagnostics does not have to be a headache. With a clear understanding of the applicable reports, a realistic timetable and a trusted professional by your side, you can turn a legal constraint into a tool that secures your sale and reassures buyers. If you are selling on the French Riviera and would like personalised guidance, visit our seller services page.
