A seller who stays silent about a violent or dangerous neighbour can be made to compensate the buyer for the resulting loss in a property’s value, as France’s highest court has just confirmed, upholding an award of more than €100,000 against sellers who concealed an aggressive neighbour they had themselves repeatedly reported to police.
The case, decided by the Cour de cassation at the end of May, concerned a Paris apartment. Its owners had bought it, with a parking space, for €615,000 in 2011 and sold it on for €710,000 in 2016. What they did not tell the buyers was that they had been targeted by the occupant of a neighbouring flat, a man whose behaviour was described in court as abnormal and extremely aggressive, and against whom they had lodged complaints with the police.
After moving in, the new owners ran into the same problem, filing their own reports over the following years. In 2020 the situation turned frightening, when the neighbour rang at their door and held a loaded pistol to the wife’s head before her husband forced him away, leaving both hospitalised in shock. The couple took the former owners to court, arguing that the sellers had deliberately hidden a situation no buyer could reasonably have overlooked.
What the court decided
The buyers did not ask for the sale to be cancelled; they chose to keep the apartment and claim damages instead. A Paris court found in their favour in 2021, the Paris Court of Appeal confirmed the decision in July 2024, and on 28th May 2026 the Cour de cassation rejected the sellers’ final appeal. The sellers were ordered to pay €106,500 — 15% of the sale price — to reflect how much less the flat was worth because of the neighbour.
Crucially, the court rejected the sellers’ argument that the buyers had lost only the chance to negotiate a lower price, which would have limited the payout. Instead it treated the harm as the full gap between the price paid and the property’s real value, and awarded the entire amount.
Silence can be deceit
The ruling, published in the court’s official bulletin and so setting a benchmark for future cases, is a reminder that under French law a seller’s silence can itself amount to fraud, known as ‘réticence dolosive’. A seller must disclose anything likely to weigh materially on a property’s value. A merely irritating neighbour would not meet that test, but concealing serious, abnormal disturbances does — and, as this case shows, a buyer who later uncovers the truth can keep the property and still recover what they overpaid.