Reference decision: cc • No. 92-21.494 • 1994-11-09 • View the decision →
Imagine: you own a flat in Saint-Paul-lès-Dax, in a recent residence. Every winter month, the collective heating bill seems disproportionate to your actual consumption. You check your distribution: it is based on your shares (your proportion of the common parts), not on the heated area. You wonder: is this legal? Hundreds of co-owners ask themselves this question every year.
The decision of the French Supreme Court of 9 November 1994 (No. 92-21.494) provides a nuanced answer. It validates the distribution of heating costs according to the shares of common parts, provided that thermal solidarity (the interdependence of homes for heat) and the absence of increased volume are established. In other words, if your flat receives heat from neighbours or if the heated areas have not been altered, the co-ownership regulations may provide for a flat-rate distribution.
But what exactly does this change for you? Let us delve into the facts, the judges' reasoning, and the practical implications for owners and tenants in the region.
The facts: an everyday story
Mr X, an owner in Capbreton, had purchased a unit in a recent co-ownership. The co-ownership regulations provided that heating costs were distributed according to the shares of common parts, not according to the heated area. Unhappy with his bill, Mr X sued the co-owners' association to challenge this distribution. He argued that the distribution key was unfair because it did not take into account individual consumption.
The tribunal de grande instance (first instance court) ruled in his favour, ordering a new distribution based on heated areas. But the association appealed (second level of jurisdiction). The court of appeal then examined the building's characteristics in detail: insulation, heating system, volumes. It noted that the homes were thermally interdependent (heat travelling through partitions) and that the heated areas had not increased. The court therefore held that the distribution according to shares was consistent with objective utility, a criterion imposed by Article 10 of the Law of 10 July 1965 (which provides that costs must be distributed according to the utility for each unit).
Mr X appealed to the Court of Cassation (final appeal). But the Court of Cassation dismissed his appeal: it held that the court of appeal had sovereignly assessed the facts and that its decision was legally justified. Thus, the flat-rate distribution was upheld.
What few people know is that this case lasted several years. Mr X spent legal and expert fees, with no final gain. A lesson for all: before challenging, it is better to understand the objective criteria of your building.
The reasoning of the court — dissected
The heart of the dispute concerned the interpretation of Article 10, first paragraph, of the Law of 10 July 1965 on co-ownership. This text requires that heating costs be distributed "according to the objective utility that these services present for each unit". In clear terms, it is not about whether you consume or not, but whether the service (collective heating) objectively benefits each unit, regardless of its actual use.
The judges of the court of appeal followed a three-stage reasoning. First, they verified thermal solidarity: in a modern, well-insulated building, heat spreads from one flat to another. An unheated home may remain at 18°C thanks to neighbours. Next, they examined whether the volumes and heated areas had been altered: if they are stable, the flat-rate distribution is justified because each unit benefits from the same heat potential. Finally, they noted that the heating surfaces (radiators, etc.) had not been altered.
The Court of Cassation upheld this reasoning by recalling that: "the court of appeal, which takes into account thermal solidarity and construction criteria and notes the absence of increase in volume and heated area, as well as any modification of the heating surfaces, sovereignly holds that the distribution of heating costs according to the shares of common parts complies with the criterion of objective utility". In other words, it is a decision of fact, not law: each building must be examined case by case.
However, note: this decision does not mean that any flat-rate distribution is valid. If your building is poorly insulated, with real consumption differences, the distribution according to shares could be successfully challenged. undefined, I have come across cases where co-owners succeeded by proving the absence of thermal solidarity.
What this changes for you — concretely
For landlords: if you rent out a flat in a co-ownership where heating costs are distributed according to shares, you cannot demand a refund based on your tenant's actual consumption. The case law validates this distribution if thermal solidarity is established. Check the co-ownership regulations before buying.
For tenants: you can challenge a flat-rate distribution if your home is particularly poorly insulated or if you have made energy savings (lowering heating, absences). But the burden of proof is on you: you will need a thermal assessment. Concrete example: in Saint-Paul-lès-Dax, a tenant in a 1980s residence obtained a 30% reduction on his bill after proving that his home lost heat through the walls.
For buyers: before buying in a co-ownership, ask to see the co-ownership regulations and the cost breakdowns. If the distribution is flat-rate, ask the managing agent about the criteria for thermal solidarity. If the building is recent and well-insulated, it is likely legal. Otherwise, negotiate a price reduction or insist on a modification of the regulations.
Numerical example: in Capbreton, a co-ownership of 20 units adopted a flat-rate distribution. An owner whose 50 m² unit had a share of 5% paid €1,200 per year, while a neighbour with 100 m² and 10% paid €2,400, even if the first consumed less. The 1994 decision validates this difference if thermal solidarity exists.
Four tips to avoid this type of dispute
- Check the co-ownership regulations upon signing the sale deed. Identify the clause on distribution of heating costs. If it is flat-rate (based on shares), ask the notary or managing agent whether a thermal study has been carried out to justify thermal solidarity.
- Have a thermal audit carried out if you suspect inequality. For around €300 to €500, a consultancy can measure heat transfers between units. If the audit shows an absence of solidarity, you can challenge the distribution with solid evidence.
- Propose a modification of the regulations at the general meeting. If you are a co-owner, you can put a new distribution key based on heated areas on the agenda. A two-thirds majority is required (Article 26 of the 1965 Law).
- Keep your bills and individual consumption records. In case of a dispute, these documents will demonstrate the gap between your actual usage and the flat-rate distribution. But remember: the law favours objective utility, not actual consumption.
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Further reading: related case law and developments
The 1994 decision is part of a consistent line: the Court of Cassation regularly validates flat-rate distributions based on shares when thermal solidarity is established. For example, in a judgment of 15 January 1992 (No. 89-21.123), it had already held that "the distribution of heating costs according to shares of common parts is not contrary to Article 10 of the Law of 10 July 1965 provided that the building has thermal unity". This case law has been confirmed subsequently.
Conversely, if thermal solidarity is lacking (old building, individual insulation), the courts annul the flat-rate clause. For example, a judgment of the Paris Court of Appeal of 12 March 2002 imposed a distribution based on heated areas for a 1960s building without insulation. The recent trend is to require precise technical justification: a simple visual inspection is no longer enough. Judges require expert reports.
For the future, with the rise of individual meters and thermal regulations (RT 2012, RE 2020), thermal solidarity tends to decrease. Recent constructions are better insulated and each home can be heated independently. Courts may therefore be stricter on the validity of flat-rate distributions. So be careful if you buy in a recent building: check that the co-ownership regulations have been updated.
Frequently asked questions
Can I challenge my heating bill if it is based on shares? Yes, but only if you prove the absence of thermal solidarity or a change in heated areas. Without an expert assessment, you risk losing and having to pay legal costs.
What if my neighbour does not heat and my bill increases? Thermal solidarity works both ways: you benefit from your neighbours' heat, and vice versa. If your neighbour does not heat, this may reduce your consumption, but the flat-rate distribution does not change. You cannot demand a reduction.
What are the time limits for legal action? The limitation period is 5 years from the date of knowledge of the facts (Article 2224 of the Civil Code). But it is advisable to act quickly, as judges are sensitive to the stability of charges.
Can a tenant challenge the distribution of charges? Yes, he can bring the matter before the tribunal judiciaire to obtain a refund if the clause is unfair. But he must prove that the distribution does not correspond to objective utility. In a recent building, this is rarely successful.
How much does a challenge cost? Budget between €1,500 and €3,000 for a thermal assessment, plus legal fees (often €1,000 to €2,000). If you win, the association may be ordered to pay these costs.
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 →
