Property
Check the seller's file before you buy
dossier de diagnostic technique (DDT) et documents de copropriété
What is it
The bundle the seller has to hand you: the technical diagnostics grouped in a dossier de diagnostic technique, plus the copropriété paperwork when you are buying a flat.
Do I need it
Yes for any purchase. For a flat it also sets the clock: the 10-day withdrawal period only starts the day after you have received the copropriété documents.
When
Before or with the avant-contrat. The DDT is attached to the promesse de vente or to the acte de vente.
Where · mixed
From the seller, through the estate agent or the notaire. The diagnostics themselves are done by a certified diagnostiqueur.
Documents
DPE, and an énergie audit for a house rated E, F or G
Lead (CREP) for anything built before 1 January 1949, and asbestos where the building permit predates 1 July 1997
Electrical and gas installation reports where the installation is over 15 years old
Termites in designated zones, the état des risques, and the noise exposure statement near airports
For a flat: règlement de copropriété and état descriptif de division, the last 3 years of assemblée générale minutes, the carnet d'entretien, the charges and fonds de travaux figures, the état daté and the loi Carrez surface
What happens next
Diagnostics required when selling a home →
- Read the DDT before you commit — it is the seller's statement of what the property is.
- For a flat, your 10-day withdrawal period runs from the day after you receive the copropriété documents.
- The avant-contrat must also say whether the property sits in a mérule zone declared by prefectural order.
SOURCE: SERVICE-PUBLIC.GOUV.FR
CHECKED 18.09.2026