Abnormal Neighbourhood Disturbance: Can a Soft and Regular Noise Be Condemned?

Imagine: you have just bought a house in Vitré, in a quiet street, to finally enjoy the silence. But every morning, a dull hum rises from the neighbour's cellar. This noise, though regular, prevents you from sleeping. You hear it day and night, like an insistent murmur. What can you do? Does the law protect you against this kind of nuisance? The French Supreme Court ruled on a similar case in 1986, and its decision is still a reference today for all neighbourhood disputes.

In this case, a couple living in Rennes sued their neighbour because of noise and odour nuisances from a compressor installed in his cellar. The trial judges ordered the owner to insulate the compressor and install a protective cover. But the Supreme Court quashed this judgment: the judges had failed to draw the consequences of their own findings. Indeed, they had described the noise as "soft and regular", which contradicted the concept of abnormal disturbance. This decision recalls an essential principle: to be condemned, the disturbance must be abnormal, i.e., exceed the ordinary inconveniences of neighbourhood.

So, can a soft and regular noise constitute an abnormal disturbance? The answer is nuanced. It all depends on its intensity, duration, the time at which it occurs, and the sensitivity of the person suffering it. Let us decipher this landmark decision together and see what it changes for you, whether you are an owner, tenant or property professional.

The facts: a story like any other

Mr X, owner of a building in Rennes, had installed a compressor in his cellar for his professional activity. This compressor produced a continuous noise, which the neighbours, Mr and Mrs Y, considered unbearable. In addition, unpleasant odours escaped from the cellar. Tired of it, Mr and Mrs Y sued Mr X before the Tribunal de grande instance of Rennes, seeking soundproofing of the compressor and installation of a cover, as well as damages.

The court ruled in favour of Mr and Mrs Y, ordering the insulation works. Mr X appealed, but the Court of Appeal upheld the judgment, even adding that the owner had already insulated another compressor, which in its view proved the necessity of doing so for this one. Mr X then appealed to the Supreme Court.

Before the Supreme Court, the debate centred on the characterisation of the disturbance. The trial judges had found that the noise was "soft and regular". But paradoxically, they had ordered insulation measures. The question was: can a soft and regular noise be abnormal? For the Court, the answer is no, unless there are special circumstances. In the absence of detail on the exact intensity of the noise, the judges should not have condemned.

The reasoning of the court — dissected

The Supreme Court relies on the general principle of civil liability, now codified in Article 1240 of the Civil Code (former Article 1382). This text provides that "any act whatever of man which causes damage to another obliges the person by whose fault it occurred to make reparation." In matters of neighbourhood disturbances, case law has specified that the fault lies in exceeding the normal inconveniences of neighbourhood.

Here, the trial judges had noted that the noise was "soft and regular". However, for the Supreme Court, this characterisation in itself excludes the abnormal nature of the disturbance. By nevertheless ordering works, the judges violated the aforementioned principle. The Court therefore quashes the appeal judgment for lack of legal basis: the judges did not deduce the legal consequences from their own findings.

This is not a reversal, but a confirmation of consistent case law. As early as 1971, the Supreme Court had ruled that "no one must cause an abnormal neighbourhood disturbance to another." The 1986 decision specifies that the abnormality must be assessed objectively, and not according to the victim's sole sensitivity. The arguments of Mr and Mrs Y (personal discomfort, insomnia) were not accepted because the objective noise was soft.

For property professionals, this decision is a safeguard: an owner cannot be condemned for a noise which, objectively, remains within the limits of social tolerance. But beware: if the noise becomes louder, irregular or nocturnal, the balance may tip in favour of the victim.

What this changes for you — concretely

For the landlord: if your tenant complains about noise from a common equipment (boiler, heat pump), you are not automatically liable. The noise must be objectively abnormal. Example: in Rennes, an owner was ordered to insulate his mechanical ventilation system because the noise exceeded 35 dB at night. Below this threshold, case law is more lenient.

For the tenant: if you suffer regular noise, do not just say it bothers you. Have its intensity measured by an acoustic expert. A noise of 30 dB (whisper) will not be considered abnormal, unless it is continuous 24/7. Conversely, a jerky or nocturnal noise may be upheld.

For the buyer: before buying a property, inquire about the technical equipment of neighbours. If a heat pump is adjacent to your future bedroom, negotiate a clause providing for its insulation at the seller's expense. The 1986 decision protects you: if the seller did not inform you, you can act for latent defect.

For the co-owner: in a co-ownership, noise nuisances are often governed by the regulations. But even without a clause, the principle of abnormal disturbance applies. If a co-owner installs a compressor in the common parts, the management company may be held liable.

Four tips to avoid this type of dispute

• Have the noise measured objectively: before any legal action, call in an acoustician. In Rennes, the cost of an acoustic expert report is around €800 to €1,500, but it may save you much higher court costs. If the noise is below 30 dB during the day or 25 dB at night, it will be difficult to prove abnormality.
• Prioritise dialogue with the neighbour: in 80% of cases, a courteous exchange allows a solution to be found. Offer to share the insulation costs. This will save you from proceedings that can last an average of 18 months at the Rennes court.
• Keep evidence: audio recordings, testimonies from other neighbours, bailiff's report. Without evidence, the judge will not be able to assess the abnormality. A bailiff's report costs around €200, but it is often reimbursed if you win.
• Consult a solicitor before suing: an initial 30-minute consultation can guide you on the strength of your case. In Vitré as in Rennes, solicitors specialising in property law are numerous. Do not rush in: a poorly initiated action may backfire.

Further reading: related case law and developments

The 1986 decision is part of a consistent line. In 1971, the Supreme Court had already laid down the principle in the "Caisse régionale d'assurance mutuelle agricole du Cantal" case: no one must cause an abnormal neighbourhood disturbance to another. Since then, case law has clarified the contours of abnormality. For example, in 2014, the Court ruled that cigarette smoke odours constitute an abnormal disturbance if they are repeated and unpleasant (Civ. 3e, 30 September 2014, No. 13-20.913).

The current trend is towards objectifying the disturbance: judges increasingly rely on measurable criteria (decibels, frequency, duration) rather than the mere subjectivity of the victim. This protects owners against abusive complaints, but requires victims to provide technical evidence.

For the future, the question arises with new technologies: drones, heat pumps, wind turbines. These devices produce continuous noises, sometimes described as "soft" by their designers. Case law will have to decide on a case-by-case basis, but the 1986 principle remains: an objectively low noise does not constitute an abnormal disturbance, except in special circumstances (immediate proximity, night, cumulation with other nuisances).

Key points to remember

FAQ:

• Can a soft and regular noise be condemned? No, unless it exceeds the normal inconveniences of neighbourhood. The 1986 decision reminds us: objective abnormality is required.
• What to do if my neighbour installs a noisy heat pump? Have the noise measured. If it exceeds 35 dB at night, you can act on the basis of abnormal disturbance. Otherwise, prioritise negotiation.
• Can I obtain damages? Yes, if you prove harm (sleep disturbances, loss of enjoyment). But the amount is often modest: €1,000 to €5,000 for prolonged noise nuisances.
• What is the time limit to act? You have 5 years from the manifestation of the disturbance (general limitation period). But act quickly: the longer you wait, the harder it will be to prove the continuity of the disturbance.
• Do I have to go through a solicitor? Yes, for court proceedings. But a prior conciliation (free of charge) may be attempted before the local judge.

Are you in a similar situation? An initial 30-minute consultation with Maître Zakine (€45) may save you months of proceedings — and often much more. Book an appointment →