Technical diagnostic file (DDT)
The compulsory bundle of property diagnostics that a seller must provide to the buyer before signing the preliminary contract. It includes the DPE, asbestos survey, lead assessment (CREP), electrical and gas checks, natural and technological risk statement (ERP), termite survey, and Carrez measurement. Its exact content depends on the property's age, location, and type.
Key points
- Groups DPE, asbestos, lead (CREP), electricity, gas, ERP, termites, and Carrez measurement.
- Content varies by property age, location, and intended use.
- Missing a required diagnostic can lead to sale nullity or warranty claims.
- The broker uses the DDT to identify potential risks affecting property value.
Frequently asked questions
Who bears the cost of the property surveys in the DDT?
In principle, the cost of DDT diagnostics is borne by the seller, who must have them carried out by a certified diagnostician before listing the property. This cost is not legally capped and varies by number of required diagnostics, property size, and region. In practice it typically ranges from €200 to €800 for a standard flat.
What risk does a seller face if they hand over an incomplete DDT?
An incomplete or inaccurate DDT creates seller liability. The buyer may request a price reduction or even contract rescission in the most serious cases, especially when missing information related to a substantial risk (asbestos, lead, termites). The notary checks the DDT's completeness before proceeding to the authentic deed.
What distinguishes the natural and technological risk statement (ERP) from other DDT diagnostics?
The ERP is not carried out by a certified diagnostician but by the seller themselves, based on publicly available information on the government website. It lists natural risks (flooding, ground movement, earthquake), technological risks (hazardous industries), mining risks, and soil pollution to which the property is exposed. Its validity is six months.
In practice
During the signing of a preliminary contract for a 1950s flat, the notary notes that the lead survey (CREP) is missing from the DDT. The signing is suspended until the seller provides the document, as the sale could otherwise be voided.
Official sources
- Property diagnostics required when selling · Service-Public.gouv.fr
- Sale agreement and loan condition precedent · Service-Public.gouv.fr
- Housing and financing information · ANIL