Abnormal Neighbourhood Disturbances: When Lawful Construction Becomes a Source of Litigation

Picture the scene: you live quietly in your house in Landerneau, with an open view over the valley. One morning, a crane appears. Your neighbour, owner of the adjacent plot, has obtained planning permission for a two-storey house. Nothing illegal. But as the walls rise, your living room is plunged into shadow for a good part of the day. You lose the sunlight, and with it, part of your comfort. You may be tempted to give up: 'He has the right, it's legal, I can't do anything.' Yet the law recognises that even a perfectly authorised construction may cause abnormal neighbourhood disturbances (nuisances exceeding what one must normally tolerate between neighbours). The question every owner asks is therefore: how much inconvenience from a neighbouring construction must one endure? The answer lies in a landmark judgment of the Court of Cassation of 27 June 1973, which lays down a rule that is simple in appearance but has very concrete practical consequences.

This decision, often cited by the courts, including at the Brest tribunal, distinguishes normal inconveniences (those which every neighbour must accept) from abnormal disturbances (those exceeding ordinary limits). And it clarifies that the lawful nature of the construction is no excuse. In plain terms, your neighbour cannot hide behind his planning permission to impose excessive nuisances on you. But then, where is the limit between what is normal and what is abnormal? And how does one obtain compensation? That is what we will examine in detail, with concrete examples from my practice in Brest, Landerneau and Guipavas.

In this article, I will tell you the facts of this case, dissect the judges' reasoning (the intellectual process that led them to their decision), and above all give you keys to know when and how to act. Whether you are an owner, tenant or property professional, this case law concerns you. So, how to react?

The facts: a story like those that happen every day

We are in the 1970s. A société civile (a group of persons, often family-owned, holding property) builds a 20-metre high building on a plot for which it has obtained all administrative authorisations. The building complies with the local development plan (the document setting construction rules in the municipality). Everything is in order. But the neighbours, owners of individual houses nearby, find their daily life disturbed: the building casts a shadow over them, reduces their sunlight, and in their view, devalues their property. They sue the société civile for damages (a sum of money in compensation for the harm suffered).

Before the tribunal de grande instance (now tribunal judiciaire), the neighbours lose: the judges consider that since the construction was lawful, the inconveniences must be endured. But the neighbours do not give up and appeal (they ask a higher court to re-hear the case). The court of appeal rules in their favour: it orders the société civile to pay damages, on the ground that the exceptional height of the building (20 metres) creates an abnormal neighbourhood disturbance. The société civile appeals to the Court of Cassation (it challenges the interpretation of the law made by the court of appeal).

The Court of Cassation (the highest French judicial court) must decide: can a lawful construction be a source of abnormal disturbances? The answer is yes. It dismisses the société civile's appeal and upholds the court of appeal's decision. In other words, even if you have complied with all the rules, if your construction causes excessive nuisances to your neighbour, you may be ordered to compensate them. This decision has become a reference for all neighbourhood disputes.

The reasoning of the court — explained

The heart of the ruling lies in one sentence: 'If the neighbour of someone who has lawfully built on his land is required to bear the normal inconveniences of neighbourhood arising from the new construction, he is entitled, on the other hand, to demand compensation as soon as these inconveniences exceed that limit.' In other words, there is a threshold of tolerance, and beyond that threshold, even an authorised activity becomes wrongful within the meaning of Article 1240 of the Civil Code (former Article 1382), which obliges one to repair the damage caused by one's fault. The 'fault' here is not the unlawfulness of the construction, but the exceeding of the limit of normal inconveniences.

The judges of the Court of Cassation criticised the court of appeal for not having sufficiently characterised the abnormal nature of the disturbances. Indeed, the court of appeal had merely stated that the height of 20 metres was exceptional without explaining how this created excessive nuisances compared to the previous situation. But the Court of Cassation nevertheless upheld the decision, considering that the trial judges (the judges of the court of appeal) had sovereignly assessed (definitively evaluated) the existence of an abnormal disturbance. What is interesting is that the Court of Cassation does not itself decide on the normal or abnormal character: it merely checks that the judges gave sufficient reasons. This is what is called control of reasoning (verification that the decision is justified).

This decision confirms earlier case law which tends to protect the neighbour against the excesses of his neighbour, even in the absence of intentional fault. It marks an important step in the theory of abnormal neighbourhood disturbances, which is now a key concept in property law. For owners in Guipavas or elsewhere, this means that mere administrative compliance does not shield you from legal action.

What this means for you — practically

Concretely, this decision has implications for several profiles:

• Landlord owner: if you build a rental property, you must anticipate potential nuisances for neighbours. For example, if your 15-metre high building casts a shadow over the neighbouring house, you could be ordered to compensate the neighbouring owner. undefined, I came across a case where an owner in Guipavas had to pay €10,000 in damages for loss of sunlight, even though his planning permission was perfectly valid.
• Buyer: before buying a property, check neighbouring construction projects. If planning permission has been granted for a tall building, know that you will have remedies if the disturbances exceed normal limits. But beware: the time limits for action are short (5 years from completion of the works for abnormal disturbances).
• Co-owner: if works in the co-ownership (such as raising the height of a building) create nuisances for neighbours, the co-owners' association may be held liable. Ensure that impact studies are carried out in advance.
• Tenant: you can also act if the disturbances affect your peaceful enjoyment of the dwelling. For example, if a neighbouring construction site deprives you of a view or light, you may claim a rent reduction or damages.

If you are in this situation, you must: gather evidence (photos, bailiff's reports, witness statements), consult a lawyer to assess the abnormal nature of the disturbance, and act within the limitation periods (5 years from the manifestation of the disturbance). The amounts awarded vary: from a few hundred euros for partial loss of view to several tens of thousands of euros for total loss of sunlight or property devaluation.

Four tips to avoid this type of dispute

• Before building, carry out an impact study on the neighbourhood: analyse sunlight, views, cast shadows. If the project risks creating nuisances, consider modifications (setback, reduced height). This can avoid years of litigation.
• Talk to your neighbours in advance: present your project, listen to their concerns. An amicable agreement (for example, planting trees to mask the view) can avoid a trial. I have seen cases settled for €1,500 in legal fees, where a trial would have cost €10,000.
• Keep all evidence of the previous state: photos, videos, statements. In case of a dispute, you will need to demonstrate the evolution of nuisances. A bailiff's report before the start of works is an investment of a few hundred euros that can make a difference.
• Check your legal protection insurance: it may cover part of the legal costs. Home insurance policies often include this option for a modest cost (€30 to €60 per year).

Further analysis: related case law and developments

The 1973 decision is part of a line of judgments that have gradually refined the concept of abnormal disturbance. For example, a judgment of the Court of Cassation of 4 July 1990 (No. 88-16.200) held that a building overlooking the neighbouring garden constitutes an abnormal disturbance, even if the construction complies with planning permission. Conversely, a judgment of 5 May 2004 (No. 02-15.372) considered that the mere loss of sunlight for a few hours a day is not necessarily abnormal in a dense city centre.

The current trend of the courts, including at the Brest tribunal judiciaire, is increasingly protective of neighbours. Judges do not hesitate to order demolition of a construction if the disturbances are serious and disproportionate, even if the planning permission was valid. What few people know is that the time limit for seeking demolition is shorter (2 years from completion of the works) than for damages. So be careful not to delay.

For the future, case law is evolving towards an increasingly concrete assessment of disturbances: judges take into account the configuration of the site, urban density, local habits. In Landerneau, for example, a loss of sunlight will be judged more severely than in a narrow street in Brest. It is all a matter of context.

Summary and next steps

• Before this decision: the administrative legality of a construction was often considered a shield against neighbours' actions.
• After this decision: mere compliance with planning permission is not enough; one must also respect the limit of normal neighbourhood inconveniences.

What to do if you suffer a disturbance:

1. Document the disturbance (photos, videos, sunlight readings).
2. Contact your neighbour amicably (registered letter with acknowledgement of receipt).
3. Consult a lawyer specialising in property law to assess your chances.
4. If no amicable solution, initiate legal proceedings within the time limits (5 years for damages, 2 years for demolition).

Do you find yourself in a similar situation? A first 30-minute consultation with Maître Zakine (€45) may save you months of litigation — and often much more. Book an appointment →