Change of Use of a Dwelling: When the Tenant Loses the Right to Remain in Possession

Imagine: you let a flat in Sainte-Foy-lès-Lyon, a charming suburban house with a view of the Saône. The tenant, a dynamic salesperson, promises to make it his home. But one day, you discover he has set up an office, receives clients, and the address serves as the registered office of his SARL. You ask him to stop, he replies that it is occasional, that you knew about it, that you turned a blind eye. Above all, he brandishes a letter: "You never gave me formal notice to comply with the lease, so you cannot evict me." Is he right? This is the question the Court of Cassation decided in 1968, and its answer is unequivocal.

When a tenant changes the use of the premises — for example, from residential to professional — he commits a breach of the lease. Even if he has not received a formal notice (written demand to comply with the contract), even if he ceased his activity after discovery, even if the landlord tolerated the situation for years: he remains in bad faith and can be evicted. Tolerance, however long, never creates a right. And belated cessation of the unlawful activity does not erase the breach.

This decision, handed down over half a century ago, remains highly relevant today. In Lyon as elsewhere, disputes over changes of use are soaring with the growth of teleworking and micro-enterprises. Landlord, you should know that your silence does not deprive you of your rights. Tenant, you must understand that converting a dwelling into an office without written consent is an eviction risk.

The facts: a story that happens every day

Mr Y..., owner of a building in Meudon (Hauts-de-Seine), had let a flat to Mr X... for exclusive use as a bourgeois dwelling. The lease was clear: no professional activity. But Mr X..., no doubt to supplement his income, carried on his occupation of... trader? craftsman? The archives do not specify, but he set up his activity on the premises.

For years, Mr Y... said nothing. Perhaps he did not notice, perhaps he hesitated to make a fuss. But one day, he decided to act: he sued Mr X... to have the lease violation established and to obtain his eviction. The tenant defended himself with several arguments: firstly, the landlord had never sent him a formal notice to cease the activity (yet, to terminate a lease, a formal notice is often required); secondly, he had finally ceased his activity before the judgment; thirdly, the landlord had tolerated the situation for years, which amounted to tacit consent.

The lower court judges (the Court of Appeal) ruled in favour of the landlord, ordering eviction. Mr X... appealed to the Court of Cassation. The case came before the Court of Cassation, Civil Chamber, on 30 May 1968. Verdict: appeal dismissed. The tenant loses.

This case, although over 50 years old, is a classic. Every year, hundreds of tenants in Lyon, Villeurbanne or Sainte-Foy-lès-Lyon believe they can convert their dwelling into a doctor's surgery, an estate agency or a workshop, and find themselves in court. The 1968 decision reminds them of an iron rule: the contractual purpose of the premises is sacred.

The reasoning of the court — dissected

The Court of Cassation had to answer a specific question: can a tenant who has breached the lease by changing the use of the premises rely on his good faith to avoid eviction? It answers no, for three reasons, set out in a famous paragraph ("attendu") of the decision.

First, the absence of a formal notice. The tenant argued that the landlord had not sent him a formal notice (registered letter with acknowledgement of receipt ordering him to cease the activity), which would be necessary to terminate the lease. The Court dismisses the argument: a formal notice is only required for termination of the lease itself (for example, for non-payment of rent). Here, it is not a question of terminating the lease, but of establishing that the tenant has committed a breach by changing the use. The breach is immediately established, without any prior formal notice.

Second, the belated cessation of the unlawful activity. The tenant had ceased his professional activity before the judgment. He hoped to "erase" the breach. The Court recalls that the breach is consummated at the moment it is committed. Ceasing afterwards does not remove it, just as a thief who returns the loot after being caught remains a thief. The judge must assess the situation at the time he rules, but the past breach justifies eviction.

Third, the alleged tolerance of the landlord. The tenant argued that the landlord had turned a blind eye for years, which would amount to tacit authorisation. The Court replies scathingly: "an alleged tolerance which, however long, cannot create a right." In other words, even if the landlord knew and did not act immediately, this creates no right for the tenant. The landlord may act whenever he wishes, even after years.

This reasoning is based on Article 1103 of the Civil Code (formerly Article 1134) which provides that agreements must be performed in good faith. And also on the concept of "contractual purpose": the lease specifies a particular use, and any deviation, even if tolerated, may be sanctioned.

This decision is neither a reversal nor an evolution: it confirms a constant line of authority. But it has the merit of clarity. It tells tenants: you cannot have it both ways. And landlords: do not let the situation become established, but know that even if you have delayed, your rights are preserved.

What this means for you — in practical terms

If you are a landlord: you can act at any time, even if you have tolerated a change of use for years. But caution: tolerance is not a blank cheque for the tenant, but it can complicate proof. It is better to send a formal notice as soon as you become aware of the breach, to prevent the tenant from arguing novation (variation of the contract by tacit agreement). In the 1968 case, the landlord won, but each case is unique. In Lyon, a landlord who discovers that his tenant is using the flat as a consulting office must act quickly: a registered letter with acknowledgement of receipt, then a court claim if necessary. The average duration of an eviction procedure for change of use is 6 to 12 months, at a cost of €2,000 to €5,000 in legal fees and court costs.

If you are a tenant: do not imagine that the landlord's silence protects you. Even if you have carried on a professional activity in your home for 10 years without any reaction from the landlord, you can be evicted overnight. If you wish to carry on an activity, ask for written permission, preferably by a lease amendment. Otherwise, you risk losing your home and having to pay damages to the landlord for interference with his quiet enjoyment. Example: in Sainte-Foy-lès-Lyon, a tenant who converted his garage into a hairdressing salon without authorisation was evicted and ordered to pay €8,000 in damages to the landlord.

If you are a buyer or co-owner: before buying a dwelling, check that the seller has not changed the use (for example, a former shop converted into a dwelling without planning permission). In a co-ownership, the regulations may prohibit certain professional activities. If a co-owner lets his unit to a professional, you can take action against him or against the tenant.

Four tips to avoid this type of dispute

• Insert an exclusive use clause in the lease: specify in black and white that the dwelling is for exclusive residential use, and that any professional activity, even partial, is prohibited without written consent. This clause will facilitate proof in the event of a dispute.
• Send a formal notice at the first suspicion: if you notice a professional activity, send a registered letter with acknowledgement of receipt reminding the tenant of the clause and giving him 8 days to cease. This creates a fixed date and demonstrates your opposition.
• Have the breach recorded by a bailiff (commissaire de justice): a bailiff's report is evidence that is hard to challenge. It can record professional nameplates, the comings and goings of clients, visible professional equipment. In Lyon, a bailiff's report costs between €150 and €300.
• Never accept rent for professional use without an amendment: if you tolerate the situation and collect a higher rent (since professional premises often let for more), you risk being deemed to have accepted the change. Sign an amendment modifying the use, with the tax and planning consequences.

Further reading: related case law and developments

The 1968 decision fits into a consistent line of authority. Earlier, the Court of Cassation had already held (Civ. 3e, 4 March 1965) that the landlord's tolerance does not amount to a waiver of the right to rely on the breach of the lease. Subsequently, it clarified that even verbal authorisation is not enough (Civ. 3e, 21 June 2000, No. 98-21.579). The trend is therefore towards contractual strictness.

Since the ALUR law of 2014, the change of use of residential premises is even more regulated in large cities (Lyon, Paris, etc.): administrative authorisation is required to convert a dwelling into professional premises. In Lyon, the town hall requires compensation (creation of social housing) for any conversion. The courts apply these rules strictly.

For the future, the increase in teleworking and self-employed workers might soften the case law? That is far from certain. The Court of Cassation remains attached to the letter of the lease. Only a contractual or legislative change could alter the situation.

Checklist before taking action

FAQ:

• Can I evict my tenant without a formal notice? Yes, if the breach is established (change of use). A formal notice is not a mandatory prerequisite for legal action, but it is recommended to prove your opposition.
• What if the tenant ceased his activity before the trial? You can still seek eviction, as the breach has already been committed. However, the judge may be more lenient if the activity has ceased and will not resume. It is up to you to demonstrate the risk of recurrence.
• Does tolerance for several years extinguish my right to take action? No, tolerance does not create a right. However, if you have expressly authorised the activity (in writing), you cannot go back.
• What are the time limits for taking action after discovery? There is no specific limitation period for this type of action (it is a personal action, subject to a 5-year limitation period). But act quickly to avoid the judge considering that you have tacitly accepted the situation.
• Can I claim damages in addition to eviction? Yes, you can claim damages for interference with quiet enjoyment and loss of rental value. In practice, courts award between €1,000 and €10,000 depending on the duration and nuisance.

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