Housing estate: the regulations bind your co-ownership (Cass. 1988)

Can a building in co-ownership free itself from the rules of the housing estate in which it stands? This question, seemingly technical, affects thousands of owners in France, particularly in the Paris region, where residential estates and co-ownerships coexist. On 26 October 1988, the Court of Cassation delivered a fundamental decision, still little known to the public, which establishes a clear hierarchy: the estate regulations take precedence over the freedoms of the co-ownership.

Imagine: you have just bought a flat in a quiet neighbourhood of Paris, convinced that the professional activity you plan is permitted by the co-ownership regulations. But a neighbour confronts you with an older document, the estate regulations, which prohibit any commercial activity. Do you have the right to ignore it? The Court of Cassation answers in the negative.

This landmark ruling illustrates a recurring tension between two regulatory layers. Far from being a theoretical debate, it determines the use you can make of your property, and sometimes even its market value. Let us dissect this decision and its practical consequences together.

The facts: a story that happens every day

The case originates in a co-ownership building located within a housing estate, probably in the Chambéry area—the court of appeal seized was that of Chambéry. The company Cogel, a developer or promoter, had acquired one or more units in this building. Confronted with the estate regulations, it challenged the restrictions imposed on its project.

The co-ownership regulations of the building stipulated, as permitted by article 8 of the Law of 10 July 1965 on co-ownership, that only restrictions justified by the building's designated use could be imposed on co-owners. In other words, if a use was consistent with the “designated use of the building” (i.e., the overall purpose of the structure: residential, mixed, commercial, etc.), the co-ownership regulations could not prohibit it. However, the estate regulations, for their part, prohibited certain uses.

The company Cogel then took legal action, arguing that the estate regulations disregarded the freedom of co-owners guaranteed by the 1965 Law. The high court (tribunal de grande instance) and then the Chambéry Court of Appeal in its judgment of 27 January 1987 agreed. For the lower courts, the designated use of the co-ownership building should prevail over the clauses of an estate regulation that was not a town planning document binding on co-owners. A victory at first instance, but one that was to be short-lived. For the Court of Cassation, on appeal, was abruptly to reverse the logic.

The court's reasoning—dissected

The Court of Cassation quashes the appeal decision, with reference to article 8 of the Law of 10 July 1965 and article 1142 of the Civil Code (now replaced by other provisions on the binding force of contracts). It sets out a simple principle: “the designated use given to a built property, even in co-ownership, within the perimeter of a housing estate must comply with the provisions of that estate's regulations”.

How do the judges reach this conclusion? They first recall that the estate regulations are a contract binding all estate members (owners of plots in the estate). Unlike a simple town planning document, it has a contractual nature and is binding on all who acquire a plot, whether or not they were original parties to the estate. It can therefore restrict the use of properties, including when they are built and divided into co-ownership.

The Court rejects the argument that article 8 of the 1965 Law limits such restrictions. This provision, which lays down the principle of freedom of use in co-ownerships subject to the building's designated use, does not prevent an estate regulation from specifying or restricting that use. In other words, the designated use of the building cannot be determined independently of its overall legal environment. If the estate imposes an exclusively residential use, the co-ownership cannot substitute a mixed use, even with the unanimous agreement of its members.

Rarely has a decision so clearly established the hierarchy of private norms in property law. The Court enshrines the primacy of the estate regulation over the co-ownership regulation, removing any ambiguity. It also implicitly recalls that knowledge of the estate regulation is presumed in every purchaser, as it generally appears in the sale documents and at the Land Registry.

What this changes for you—in practical terms

For the owner of a unit located within a housing estate, this case law has very concrete effects. If you are considering changing the use of your property—converting a commercial space into a dwelling, exercising a profession from home, letting it as tourist accommodation via Airbnb—you must check not only the co-ownership regulations but also, and above all, the estate regulations.

Let us take a numerical example. A couple buys an 80 m² flat in the 15th arrondissement of Paris, within an older co-ownership integrated into a 1930s housing estate. The estate regulations prohibit any “noisy or commercial” activity. They plan to open a physiotherapy practice there, which the co-ownership regulations allow. After receiving formal notice from the estate association, they must give up, losing €15,000 in preparatory work. Had they analysed both regulations before purchasing, this dispute and loss would have been avoided.

If you are in this situation, you must immediately check the estate regulations at the Land Registry or with the seller. If they conflict with your project, there are two options: either amend the estate regulations, which requires unanimity of the estate members (thus nearly impossible), or abandon the idea. Consulting a lawyer specialising in property law, at a modest cost (an initial consultation around €150 to €200), can prevent lengthy and expensive proceedings.

As for tenants, they should know that their use is limited by these rules, and that the landlord may take action against them if a breach is found. A tenant who, unbeknownst to the owner, converts their dwelling into a business premises risks termination of the lease for breach of the contractual use.

Four tips to avoid this type of dispute

• Systematically check the estate regulations before any purchase or project. This document is public; ask the seller for it or order it from the Land Registry. In suburban areas, it is often decisive. For example, in Paris, many residential neighbourhoods like La Mouzaïa are governed by estate covenants still in force.
• Do not rely on appearances alone. Even if you see that a neighbour is peacefully carrying on a commercial activity, this does not mean the regulations permit it. It may be a tolerance that will not apply to you. A tacit waiver by the estate members is never established.
• Anticipate legislative changes. Since the ALUR Act of 2014, estate regulations not amended for more than 10 years may be lapsed in certain circumstances. Check the date of last amendment. But the rule set by the 1988 ruling remains: if the regulation is in force, it is binding.
• If in doubt, have the conflict resolved before you act. Applying to the judge in chambers for an interpretation or an expert measure costs a few hundred euros and will save you from abortive investment. A lawyer can assess your chances of success in an hour-long consultation.

Further reading: related case law and developments

The ruling of 26 October 1988 does not stand alone. It forms part of a consistent line of case law. As early as 1973, the Court of Cassation had affirmed that an estate regulation constitutes a contractual servitude enforceable against all. More recently, a ruling of 19 January 2011 (appeal no. 09-71.234) recalled that the estate regulation takes precedence over town planning documents when it is more restrictive, and that it cannot be repealed by the mere vote of a co-ownership general meeting.

Conversely, the Court has sometimes accepted that clauses that are too old or contrary to public policy (for example, discriminatory prohibitions) may be set aside. But the tendency of the courts is to preserve the stability of estates and to enforce the will of the original estate members, subject to evolving urban needs. For the future, the proliferation of serviced residences and tourist lets may reignite tensions between co-ownerships and estates, particularly in major cities like Paris where land is scarce.

Key takeaways

In summary, here are the five essential points to remember:

• Primacy of the estate regulation: it binds all plots, even buildings in co-ownership.
• The building's designated use must be assessed globally: it cannot ignore the estate's constraints.
• Before any project changing the use, check both regulations. The notary must provide them to you upon purchase.
• Remedies are limited: only a unanimous amendment or proven lapse can release you from the estate regulation's grip.
• A specialist lawyer is essential to assess the strength of the clause before taking action.

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