Mandatory Property Diagnosis: Complete 2026 List
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Certyneo
Writer — Certyneo · About Certyneo
Selling a property in France requires the seller to provide a Technical Diagnostic Report (DDT) to the buyer, attached to the sales promise or authentic deed. In 2026, regulations are strengthening, particularly on energy efficiency with progressive prohibition of renting thermal inefficient properties. Understanding the exhaustive list of mandatory diagnostics is essential to legally secure the transaction and avoid post-sale disputes. This article provides complete information on required diagnostics in 2026 according to property type, location and age.
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