Neighbourhood Noise: Even a New Floor Compliant with Standards Can Be Prohibited by the Leasehold Agreement

Imagine: you have just had a beautiful floating floor laid in your flat, brand new, compliant with standards, with acoustic certification. You are proud of the result. But your downstairs neighbour takes you to court, claiming they can now hear every step you take. You reply that everything is above board, that the sound insulation complies with regulatory values. Yet the court rules against you. How is this possible?

This is exactly what happened to a leaseholder, whom we will call Mr X, owner of a flat in a leasehold in Autun. After replacing the original carpet with laminate flooring, his downstairs neighbours complained of noise nuisance. The management company sent a formal notice, then took him to court. The Court of Appeal held that Mr X had failed in his duty to ensure the peace of the building, as required by the leasehold agreement, despite compliance with the standards. The French Supreme Court upheld this reasoning in 2003.

This decision, often overlooked, is nevertheless essential for any owner or tenant in a leasehold. It reminds us that the leasehold agreement may impose stricter requirements than the technical regulations. In short, even if your floor is 'up to standard', you can be condemned if you impair your neighbours' comfort.

The Facts: A Story That Happens Every Day

Mr X owns a first-floor flat in an old building in Autun. The leasehold agreement, dating from 1970, stipulates that 'each leaseholder must ensure that the peace of the building is not disturbed at any time by his actions and that no noise likely to disturb his neighbours is produced'. For years, the original thick carpet absorbed footsteps. But in 1999, Mr X decided to modernise his home: he replaced the carpet with engineered wood flooring, which is more aesthetic and easier to maintain.

A few weeks after the work, his downstairs neighbours, a retired couple, complained of amplified footsteps, bangs and creaks. They contacted the management company, which sent a formal notice to Mr X to remedy the nuisance. Mr X refused, arguing that his new floor complied with the sound insulation standards in force (order of 30 June 1999). He even produced a certificate of conformity. The management company, supported by the neighbours, sued him in the High Court of Chalon-sur-Saône.

At first instance, the court ruled in favour of Mr X: compliance with the standards excludes any abnormal neighbourhood disturbance. But the neighbours appealed. The Dijon Court of Appeal overturned the judgment: it found that the sound insulation of the new floor, although compliant with regulations, was inferior to that of the old carpet. However, the leasehold agreement requires not to 'produce any noise likely to disturb the neighbours'. The standard is irrelevant: the agreement is more demanding. Mr X was ordered to reinstall equivalent carpeting or to carry out enhanced sound insulation, under a daily penalty of €100 for each day of delay.

Mr X appealed to the Supreme Court. He argued that compliance with technical standards should protect him. But the Supreme Court dismissed his appeal on 15 January 2003, upholding the appeal judgment. The high court specified that the lower courts had sovereignly assessed that the new covering, even if standard-compliant, was of lower acoustic quality and violated the leasehold agreement.

The Reasoning of the Court — Analysed

The Supreme Court relied on two pillars: the leasehold agreement (which has binding force between leaseholders) and the obligation not to cause an abnormal neighbourhood disturbance, based on Article 1240 of the Civil Code (formerly 1382). It recalled that these two sources of obligations are independent of technical standards.

In this case, the leasehold agreement prohibited any disturbing noise. However, the Court of Appeal found that the new floor coverings 'even if compliant with regulatory values, were of lower sound insulation quality than the originals'. Therefore, the mere act of installing them constituted a breach of the agreement. The Supreme Court validated this reasoning: the lower courts had legally justified their decision by relying on the agreement and not on the standard.

This decision marked a turning point: it affirms that regulatory compliance is not an absolute shield. If the leasehold agreement imposes a higher level of comfort, it takes precedence over minimum standards. Thus, a leaseholder cannot hide behind a certificate of conformity to justify a degradation of acoustic comfort.

Mr X's arguments were seemingly solid: he invoked the principle that 'no one is bound to do what the law has not prohibited' and the regulatory nature of the standards. But the Supreme Court considered that the leasehold agreement, a contract between leaseholders, could go beyond the law. This is a classic application of contractual freedom, but one that often surprises owners.

Finally, the decision is in line with previous case law on neighbourhood disturbances: it reaffirms that abnormal disturbance is assessed in concreto, according to local circumstances, and not by reference to an abstract standard. Here, the abnormality stemmed from the loss of acoustic quality compared to the previous situation, combined with the terms of the agreement.

What This Changes for You — In Practice

For owners in leaseholds: you cannot change your flooring without checking the impact on sound insulation, even if the new product is 'up to standard'. If your building benefits from superior acoustic comfort (for example, thick carpet or a floating screed), you must maintain it or replace it with an equivalent product. If you do not, you risk being ordered to reinstate the old covering, pay damages (often between €1,000 and €5,000 depending on the duration of the nuisance) and a daily penalty.

For tenants: you are also bound by the leasehold agreement, even if you are not a signatory. Before changing a floor, obtain written consent from the landlord and check the agreement. Otherwise, you could be sued by the neighbour or the management company, and incur contractual liability. Concrete example: in Creusot, a tenant replaced tiles with laminate without warning. His neighbours obtained €2,000 in damages, and the tenant had to reinstall the tiles at his own expense.

For landlord leaseholders: be vigilant during renovations. If your tenant changes the floor without your consent, you can be held liable as the owner. Prefer clauses in the lease prohibiting any modification without written authorisation, and require proof of sound insulation.

If you are in this situation, you must act quickly: as soon as complaints arise, attempt mediation or conciliation. Court proceedings are lengthy (often 12 to 18 months at first instance), and legal and expert costs can exceed €3,000. Prevention is better than cure.

Four Tips to Avoid This Type of Dispute

• Consult the leasehold agreement before any floor change. It may contain specific clauses on coverings, sound insulation, or the obligation to maintain a certain level of comfort. There is no point choosing a 'standard-compliant' floor if the agreement requires better.
• Measure the sound insulation of your current floor. Hire an acoustic consultant or a control office to determine the impact sound insulation value (L'nT,w). Keep this record: it will serve as a reference.
• Choose a covering with at least equivalent insulation. If your current carpet offers an L'nT,w of 55 dB, do not choose a floor that drops to 62 dB (regulatory standard). Opt for a reinforced acoustic underlay or a floating screed.
• Inform your neighbours and the management company before the work. A preliminary declaration of work (if required) or a simple letter can defuse tensions. Offer an acoustic measurement after the work to prove compliance with the agreement.

Further Reading: Related Case Law and Developments

This 2003 decision is part of a consistent line. Already in 1998, the Supreme Court (Civ. 3e, 18 November 1998, No. 96-22.248) had held that the leasehold agreement can impose stricter obligations than the common law of nuisances. More recently, in 2019 (Civ. 3e, 10 October 2019, No. 18-21.417), the Court confirmed that mere compliance with standards is not enough to exclude a neighbourhood disturbance if the agreement is more demanding.

The trend is therefore towards strengthening the protection of leaseholders against degradation of acoustic comfort. Courts are increasingly attentive to the terms of agreements, even old ones. In the future, we can expect management companies to systematically require a sound insulation certificate for any change of covering, or even prior authorisation from the general meeting.

For owners, this means being wary of 'trendy' floors (parquet, imitation stone tiles) in old buildings, especially if the agreement is vague. It is better to consult a specialised lawyer before undertaking work.

In Practice: What to Do

FAQ

Can I change my carpet for floating parquet without authorisation? No, if the leasehold agreement requires maintaining a certain acoustic level. First check the agreement and, if in doubt, seek the consent of the management company.

What if my neighbour changes his floor and I hear more noise? First contact the management company, which will send a formal notice to the leaseholder. If that fails, take the case to the High Court (formerly TGI) for abnormal neighbourhood disturbance. You can claim damages and reinstatement.

What are the time limits for taking action? The action for neighbourhood disturbance is subject to a 5-year limitation period from the manifestation of the disturbance. But act quickly: the longer you wait, the harder it is to prove the previous state.

What is the average cost of proceedings? Expect between €2,000 and €5,000 in legal fees, plus acoustic expert fees (€1,500 to €3,000). Damages awarded vary from €500 to €10,000 depending on the duration and intensity of the nuisance.

Can a tenant be sued directly? Yes, the tenant is bound by the leasehold agreement as an occupant. He can be ordered to reinstate the premises and pay damages.

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