Unilateral Modification of the Employment Contract: When Relocation of the Head Office Becomes Wrongful Dismissal

Imagine: you live in the centre of Propriano, a stone's throw from the port, and your employer announces one fine morning that you must now work in Grosseto-Prugna, at the other end of the island. The daily commute goes from 20 minutes to 1 hour, with two bus changes. Would you accept without complaint? This is exactly the question the Court of Cassation decided in 1977, in a case that is still authoritative today.

Every owner, tenant or property professional asks themselves one day: "Can I modify an essential term of the contract without the other party's consent?" The answer is no. And this principle applies equally to employment contracts, commercial leases and residential tenancies.

This decision, handed down by the Social Chamber of the Court of Cassation on 5 October 1977, holds that the unilateral modification of an essential term of the contract (here, the place of work) by the employer, and the employee's subsequent refusal, results in a termination attributable to the employer. In plain terms, the employer is responsible and must pay compensation. Let us examine the facts, the judges' reasoning and what this means for you.

The Facts: An Everyday Story

Mrs Leroy worked as a switchboard operator in Paris since 1946. Her employer, a company, decided to transfer its services from central Paris to Saint-Ouen, a suburb. It informed her that she would now have to perform her duties in this new location. For Mrs Leroy, the commute went from 45 minutes to 1 hour 30 minutes, with more changes of transport.

Mrs Leroy refused this change and was dismissed. She brought a claim before the employment tribunal, then the Court of Appeal, which found in her favour. The employer appealed to the Court of Cassation, arguing that it had the right to reorganise its business as it saw fit, and that the change of location did not constitute a substantial modification of the contract.

But the Court of Cassation dismissed the appeal. It held that the commute going from 45 minutes to 1 hour 30 minutes, with more changes, constituted a unilateral modification of an essential term of the employment contract. Mrs Leroy's refusal was therefore legitimate, and the termination was attributable to the employer.

Imagine for a moment: if this had happened in Propriano, with a relocation to Grosseto-Prugna, the reasoning would have been the same. The judge would have examined the increase in travel time, the additional constraints, and the possibility for the employer to maintain the post at the old location.

The Reasoning of the Court — Explained

The Court of Cassation relied on Article 1134 of the Civil Code (now Articles 1103 and 1104), which provides that agreements lawfully formed take the place of law for those who have made them, and that they may be revoked only by mutual consent. In employment law, the employment contract is an agreement, and the place of work is an essential term, unless a mobility clause is provided.

The lower courts (the Court of Appeal) had found two key elements: on the one hand, the significant increase in travel time (from 45 minutes to 1 hour 30 minutes) and increased complexity (multiple changes); on the other hand, that the employer still had services in Paris where it could employ Mrs Leroy, and was therefore not compelled to relocate her. The Court of Cassation validated this reasoning: even if the employer has the right to reorganise its business, it cannot impose a substantial change without the employee's consent.

This decision is a confirmation of previous case law: the judge examines whether the change is "substantial" (essential) in light of the circumstances. It is not a reversal. It reminds that the employer's freedom has limits: it cannot undermine the economy of the contract.

The employer argued that the reorganisation was necessary, that the new premises were more advantageous (hours, holidays). But the Court held that these advantages did not compensate for the increased commuting constraint. In short, the judge assesses the overall balance of the contract.

What This Means for You — Practically

For employees: if your employer imposes a change of workplace that increases your commute by more than 30% or makes it significantly more burdensome, you can refuse. This refusal does not constitute a resignation, but a termination attributable to the employer, giving rise to redundancy pay, notice pay, and compensation. For example, if your commute goes from 20 minutes to 1 hour 10 minutes (like from Propriano to Grosseto-Prugna), it is likely abusive.

For employers: before relocating an employee, check whether there is a mobility clause in the contract. If not, the change must be accepted by the employee. If the refusal leads to dismissal, you risk paying compensation. Tip: offer compensations (travel allowance, flexible hours) to obtain written consent.

For owners and landlords: this principle also applies to leases. If you unilaterally modify an essential term (rent, service charges, permitted use), the tenant can refuse and demand termination of the lease at your fault. For example, if you increase the rent by 20% without a review clause, it is abusive.

For co-owners: a modification of the co-ownership rules (for example, banning short-term rentals) imposed without a vote at the general meeting can be challenged. The judge will assess whether the term is essential.

Concrete example: a recent client, a landlord in Grosseto-Prugna, tried to impose a change of use of the premises (from commercial to residential) on his tenant. The tenant refused, and the court ruled in the tenant's favour, ordering the landlord to pay €8,000 in damages.

Four Tips to Avoid This Type of Dispute

• Insert a mobility clause in your employment contracts or leases: draft it precisely, indicating the geographical area (department, region) and the conditions of implementation (notice period, compensation). It allows you to change the location without consent.
• Negotiate before imposing: if you need to change the workplace or rent, offer compensation (bonus, rent reduction, travel expenses) and have an amendment signed. Written consent is your best protection.
• Document the constraints: in case of a dispute, prove that the change is not substantial. Keep evidence of the commute (times, distances), written exchanges, and reorganisation decisions.
• Consult a lawyer before any unilateral modification: a 30-minute consultation can save you months of proceedings. Maître Zakine can analyse your situation and advise on the steps to take.

Besoin d'un conseil personnalisé ? Contactez Maître Zakine — première consultation 30 min à 45€.

Further Reading: Related Case Law and Developments

The 1977 decision fits into a consistent line of authority. For example, the "Société des Hôtels Réunis" case (Cass. soc., 14 October 2009, No. 08-40.915) held that a change of workplace, even without a mobility clause, can be imposed if it remains within the same geographical area and does not substantially modify the contract. But as soon as the commute doubles or constraints increase significantly, the case law is strict.

More recently, the Court of Cassation (Cass. soc., 16 September 2015, No. 14-12.647) reiterated that the judge must assess in concreto (according to the circumstances) the substantial nature of the change. Thus, a commute going from 30 minutes to 1 hour may be deemed acceptable if the employee had accepted a broad mobility clause. Without a clause, it is riskier.

The trend is towards protecting the employee (or tenant) against imposed modifications. Courts check whether the employer could reasonably have maintained the previous conditions. If so, the modification is abusive.

Checklist Before Acting

1. Have I checked for a mobility or review clause in my contract? If yes, comply with its conditions (notice period, compensation). If not, you must obtain the other party's written consent.
2. Is the change substantial? Assess the increase in commute (time, distance, complexity), the impact on personal life, and the possibility of maintaining the previous situation.
3. Have I offered compensation? A travel allowance, rent reduction, or flexible hours can facilitate agreement.
4. Have I documented the constraints? Keep evidence (maps, photos, GPS logs) and written exchanges.
5. Have I consulted a lawyer? Before making an irreversible decision, a quick consultation may save you much higher costs.

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