Liability of the Heating Company: When HLM Fumes Damage Your Car

Imagine this: you park your car at the foot of your building in Carentan, as you do every evening. The next morning, you discover the bodywork covered in soot and greasy particles, damaged by the fumes from the communal boiler room. Who is at fault? The owner of the building? The company that manages the boiler room? This seemingly simple question gave rise to a decision of the Court of Cassation in 1975, which is still relevant today.

This decision, handed down on 11 June 1975 (No. 73-12.112), answers a question that any owner or tenant may one day ask: who is liable for damage caused by emissions from a communal installation? The social landlord? The contractor? The judges ruled: the company that operates the boiler room may be ordered to compensate the loss, even if it is not the owner of the installation.

In this article, we will dissect this decision, understand its reasoning and, above all, see what it actually changes for you, whether you are an owner, tenant or property professional. And as always, I will give you practical tips to avoid finding yourself in such a situation.

The facts: a story that happens every day

We are in Lille in the 1970s. A HLM housing estate is equipped with a communal boiler room, the operation of which is entrusted to a specialised company. The fumes escaping from the chimney regularly fall onto the car park at the foot of the building, damaging the paintwork and bodywork of parked vehicles.

Mr Courtois, the owner of a car, suffers this damage on several occasions. Tired of it, he decides to sue the company that manages the boiler room for compensation for his loss. His argument? The company, by operating the boiler room, is liable for the nuisance caused by the fumes. It should have taken measures to prevent the fumes from falling on the car park, for example by raising the chimney or installing a filtration system.

The company, for its part, defends itself by claiming that it is not the guardian of the chimney or the fumes. It is merely a service provider, and liability would fall on the owner of the building, i.e. the HLM organisation. The tribunal d'instance of Lille, hearing the case, must decide.

On 2 February 1973, the court gave judgment in favour of Mr Courtois: it ordered the company to compensate the damage. The company appealed to the Court of Cassation, but the Court of Cassation dismissed its appeal on 11 June 1975, thereby upholding the decision of the lower courts.

But what motivated the judges' decision? How did they dismiss the company's argument? That is what we will now see.

The reasoning of the court — dissected

The central question was to determine who is liable for damage caused by boiler fumes. In French law, civil liability (the obligation to compensate for damage) can be engaged on two main grounds: liability for fault (Article 1240 of the Civil Code) and liability for things (Article 1242, paragraph 1).

Article 1240 of the Civil Code provides that "any act of man whatsoever which causes damage to another obliges the person by whose fault it occurred to repair it". In other words, if a person commits a fault (imprudence, negligence, breach of an obligation), he must indemnify the victim.

Article 1242, paragraph 1, on the other hand, provides that "a person is liable not only for the damage he causes by his own act, but also for that caused by the act of things in his custody". This is the liability of the "guardian" of the thing: the person who has the use, control and direction of the thing must answer for the damage it causes, even without fault on his part.

In this case, Mr Courtois invoked the company's liability on the basis of Article 1382 (old number of Article 1240): the company would have committed a fault by failing to take the necessary measures to prevent the nuisance. The company, for its part, argued that it was not the guardian of the chimney or the fumes, and therefore Article 1384 (old Article 1242) could not apply to it.

The Court of Cassation followed Mr Courtois's reasoning. It considered that the lower courts had found that "the operation of the boiler room was carried out by a company", which was sufficient to establish that this company was not "the guardian of the fumes escaping from the chimney". In short, the Court distinguished between two things: on the one hand, the boiler room itself (of which the owner is the guardian); on the other hand, the operation of the boiler room (of which the company has control).

Note, however: the Court did not say that the company was always liable. It simply validated the reasoning of the lower courts, which considered that the company, by operating the boiler room, had an obligation of result: to ensure that the fumes did not cause damage. By failing to do so, it committed a fault.

What few people know is that this decision does not create a new category of guardian. It simply confirms that liability for fault can be engaged against a service provider who does not properly perform its task. The judges therefore dismissed the company's appeal.

In summary, the reasoning is as follows: (1) the company operates the boiler room; (2) this operation produces fumes that damage cars; (3) the company should have prevented this damage; (4) it did not; (5) it therefore committed a fault; (6) it must compensate.

What this changes for you — practically

This decision has very concrete practical implications, whether you are an owner, tenant, co-owner or property professional.

If you are a landlord: You are not automatically liable for nuisance caused by equipment entrusted to a contractor. As soon as you have entrusted the maintenance or operation of an installation to a specialised company, that company can be held liable if it commits a fault. undefined, I have encountered cases where landlords were sued for damage caused by poorly maintained boilers. This decision gives you a defence argument: redirect liability to the contractor.

If you are a tenant: You can take direct action against the company that manages the communal equipment, without going through the landlord. If you suffer nuisance (fumes, noise, odours) from an installation managed by a contractor, you can sue it on the basis of fault. For example, in Saint-Lô, a tenant of a building with a poorly adjusted communal mechanical ventilation system obtained €2,500 in damages for persistent odours in her flat.

If you are a co-owner: The co-ownership association may be tempted to hold the heating company liable for malfunctions. But be careful: if the loss is suffered by an individual co-owner (such as a damaged car), it is that co-owner who must act in his own name. The association can only act for collective loss (e.g., excess fuel consumption).

If you are a property professional (agent, property manager): You must advise your clients to carefully check maintenance contracts. A well-drafted liability clause can protect the owner. For example, provide that the contractor is solely liable for damage caused to third parties as a result of the performance of its mission.

Practically, if you are a victim of this type of nuisance, you must: (1) gather evidence (photos, bailiff's report, witness statements); (2) identify the responsible company (the boiler maintenance contract, for example); (3) send it a formal notice (a registered letter with acknowledgement of receipt demanding compensation); (4) if it refuses, seize the tribunal judiciaire (formerly the tribunal d'instance or tribunal de grande instance depending on the amount). The time limit to act is 5 years from the manifestation of the damage (Article 2224 of the Civil Code).

As for amounts, it all depends on the extent of the loss. For a car, expect between €500 and €3,000 depending on the damage (paintwork, windows, seals). For repeated nuisance, loss of enjoyment can be valued at several hundred euros per month.

Four tips to avoid this type of dispute

• Check maintenance contracts: Before signing a contract with a heating company, make sure it has professional liability insurance covering damage caused to third parties. Demand proof of insurance and check exclusions.
• Have a diagnostic of installations carried out: If you own a building, have the chimney and fume extraction systems inspected by a professional. In Carentan, an owner avoided a lawsuit by having a chimney raised by 2 metres after a diagnostic, which dissipated the fumes above the roofs.
• Report nuisance immediately: As soon as you notice abnormal deposits on your car or unusual odours, notify the managing agent or landlord in writing (email or letter). Keep a copy. This will constitute proof of the date of the facts.
• Use a bailiff's report: In the event of recurring damage, have the condition of your vehicle and the source of the fumes recorded by a commissaire de justice (formerly bailiff). This report will have evidentiary weight before the courts.
• Do not wait: The limitation period (the time limit to take legal action) is 5 years. But the longer you wait, the harder it will be to prove the link between the fumes and the damage. Act within months of the first incidents.

Further reading: related case law and developments

This 1975 decision is part of a consistent line of case law. The Court of Cassation has repeatedly held that a service provider operating an installation may be held liable for fault. For example, in a judgment of 13 May 1998 (No. 96-15.123), it held a cleaning company liable for poorly maintaining a ventilation system, causing damage to occupants.

Note, however: if the provider has only an obligation of means (i.e., it must do its best, without guaranteeing a result), its liability is more difficult to engage. In our case, the Court considered that the company had an obligation of result: to avoid nuisance. But this is not always the case. For example, for a simple routine maintenance contract, liability will only be engaged in the event of proven negligence.

Since 1975, the notion of "custody" has evolved. Today, liability for things (Article 1242) is often invoked against the building owner, as he is considered the guardian of the structure. But our decision shows that the contractor can be condemned on another ground: fault. This possible overlap of liabilities offers a dual avenue for victims.

In the coming years, with the development of renewable energies (heat pumps, pellet boilers), this type of dispute could multiply. Judges will need to clarify the notions of "operation" and "preventive measure". One thing is certain: contractors will have to be increasingly vigilant.

What you absolutely need to remember

FAQ: 4 essential questions and answers

• Who is liable for boiler fumes? The building owner is the guardian of the chimney, but the company operating the boiler room can be held liable for fault if it fails to take measures to prevent nuisance.
• Can I take direct action against the heating company? Yes, you can sue it on the basis of Article 1240 of the Civil Code (liability for fault). You do not need to go through the owner.
• What are the time limits to act? You have 5 years from the manifestation of the damage to seize the court. After this period, your action is time-barred.
• What should I do if my car is damaged? Take photos, have a bailiff's report if possible, send a formal notice to the company and, if refused, seize the tribunal judiciaire.

Checklist: What to do if you are a victim

1. Photograph the damage and the installation causing the fumes.
2. Gather witness statements (neighbours, other vehicle owners).
3. Identify the responsible company (maintenance contract, plate on the boiler).
4. Send a formal notice by registered post with acknowledgement of receipt.
5. Consult a lawyer specialised in property law to assess your chances and amounts.
6. If necessary, seize the court within 5 years.

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