Renewal of a commercial lease: the applicable law is that in force on the day of renewal

Imagine the scene: a commercial premises leased in the Marais district of Paris. The lease is coming to an end, and the parties have agreed on a renewal, but when it comes to setting the rent, disagreement breaks out. The landlord waves a brand-new decree, published two years after the renewal date, to justify a significant increase. The tenant opposes it, arguing that this text cannot apply to a situation already settled. Who is right?

This question, at the crossroads of transitional law and the commercial lease regime, is not merely an academic exercise. It arises regularly, particularly in high-pressure areas like Paris where every square metre is an economic asset. The Cour de cassation, in a decision of 17 December 1974, ruled with clarity: the rules applicable to the rent of a renewed lease are those in force at the effective date of renewal. A judgment whose teachings still resonate today, as legislation on commercial leases continues to evolve.

What this decision tells us is that legal certainty requires avoiding retroactive application of new rules when the situation is already crystallised. A principle that seems simple, but in practice gives rise to plenty of tensions. Let us examine together the facts, the reasoning of the judges and, above all, the concrete consequences for any landlord or tenant of commercial premises.

The facts: a story as it happens every day

The case originates from a Parisian building, where a certain Veysandaz was the tenant of commercial premises. Opposite him, the landlords were the co-owners (i.e. the joint owners) of a property likely located within the jurisdiction of the Paris Court of Appeal. The commercial lease binding them came to an end in the late 1960s.

The parties decided to renew the contract: a new lease took effect on 1 July 1970. So far, nothing unusual. But very soon, the fixing of the annual rent for the renewed lease became a point of friction. Indeed, less than two years later, on 3 July 1972, a decree came to modify the conditions for renewal of commercial leases, notably the methods for calculating the rent. This text introduced criteria more favourable to the landlord, potentially allowing for a higher upwards revision.

The landlords, considering that this new decree should play in their favour, relied on it to obtain an increased rent. The tenant resisted, arguing that the applicable law was that at the date of renewal, i.e. 1 July 1970. The dispute was brought before the court, then before the Paris Court of Appeal. In a judgment of 17 January 1973, the second-instance judges partially upheld the landlords’ claim: they applied the decree of 3 July 1972 and set the rent “property tax to be deducted”, without however justifying the increase retained with sufficient reasoning.

The tenant did not see it that way. He appealed to the Cour de cassation, complaining that the Court of Appeal had retroactively applied a text that was not in force at the time of renewal. This is where the Supreme Court was to recall a fundamental principle.

The court’s reasoning — unravelled

The Cour de cassation ruled on the basis of a simple rule, but one that deserves explanation for the uninitiated: Article 2 of the Civil Code (which provides that “the law provides only for the future; it has no retroactive effect”). This text, a pillar of our law, forbids revisiting legal situations already established by a new rule, except where expressly provided otherwise. In this case, the decree of 3 July 1972 made no provision for application to leases renewed before that date.

The High Court first noted a procedural particularity: the Court of Appeal had given judgment before the publication of the law of 31 December 1973 (that law came to validate or specify certain aspects of the decree, but did not change the date of entry into force). However, it is not this point of chronology that determines the decision. What matters is that the lease had been renewed on 1 July 1970, well before the decree came into effect. Consequently, the rules for fixing the rent applicable were those existing at that precise date.

In clear terms, the Court partially quashed the appeal judgment because the Parisian judges had referred to a later text to determine the amount of rent, without checking whether it was applicable in time. It also criticised the Court of Appeal for having retained a rent “property tax to be deducted” without giving reasons for the increase, which constituted a lack of legal basis having regard to the texts then in force.

This two-stage reasoning is crystal clear: on the one hand, the principle of non-retroactivity prohibits applying a new rule to a situation already created; on the other hand, judges must justify any rent increase by concrete elements, failing which their decision will be overturned. One can see here the importance of rigour in the administration of evidence and the choice of reference standards.

What this means for you — in practical terms

Landlords and commercial tenants, this decision concerns you directly. It serves as a reminder that at the time of renewal of a lease (or of the first rent fixation in case of tacit renewal), it is imperative to refer exclusively to the law in force at that date. What practical consequences can be drawn from this?

For the landlord, the mistake would be, as in the case judged, to invoke a text published after the renewal in the hope of an increase. If the rent has not been set by mutual agreement, it is the commercial rent judge who will decide, and he will apply the legal criteria in force on the day of renewal. For instance, if a Parisian lease was renewed in March 2024, it is the decree of 3 November 2023 (setting the index grid) that applies, not a hypothetical text that might come into force in September 2024. The Cour de cassation has reminded on several occasions: the key date is that of the parties’ agreement or, failing that, the date of referral to the judge or the effective date of the new lease.

For the tenant, this principle provides a protective shield. If your landlord tries to impose an increase based on a later rule, you can legitimately refuse. In the rue de Rivoli area of Paris, where rents are often high, this can represent thousands of euros difference. A numerical example: an initial annual rent of €40,000, a 10% increase under a non-applicable decree would generate an unwarranted extra cost of €4,000 per year. Over three years, that is €12,000 overpaid. A well-conducted challenge can prevent this haemorrhage.

If you are in this situation, you must verify the exact date of renewal (stated in the deed or established by the court), then identify the texts in force at that time. In the event of a deadlock, a reasoned formal notice, followed if necessary by a referral to the commercial rent judge, is required. Beware: time limits for acting are short (generally two years from the fixing of the rent), and inaction could amount to tacit acceptance.

Four tips to avoid this type of dispute

• Unambiguously determine the renewal date. This is often the effective date of the new lease, whether in writing or arising from an oral agreement. In case of disagreement, it is the date of the judicial decision fixing the principle of renewal. Record it in writing and keep evidence of it.
• Identify the texts applicable on that precise date. Do not rely on mere press articles or pub talk: consult a lawyer specialising in commercial leases who will check the state of the law on that day. A preventive consultation costs far less than litigation.
• Require a detailed breakdown of any rent proposal. Whether you are landlord or tenant, an increase offer must be based on tangible elements (geographical sector, permitted activities, charges, etc.). If your counterpart merely points to a text without explaining the calculation, refuse and ask for written justification.
• In case of persistent conflict, promptly refer the matter to the commercial rent judge (juge des loyers commerciaux) of the competent judicial court. In Paris, the judicial court has a specialised chamber. The judge will fix the rent by applying the rules in force on the day of renewal, and the decision will be binding on the parties. Do not wait for years: the longer the time, the greater the risk of a tacit agreement on an erroneous rent.

Further reading: related case law and developments

The 1974 decision is not an isolated one. The Cour de cassation has consistently held this line. Thus, in a judgment of 10 July 2008 (appeal no. 07-15.332, 3rd civil chamber), it reiterated that “the rent of a renewed lease must be fixed in accordance with the legal provisions in force at the date of renewal”. An almost identical formulation, proof of the stability of the principle. More recently, in 2017, the same chamber specified that it is the legislative and regulatory texts applicable at the date of the renewal request that must be taken into account, putting an end to some doctrinal hesitations.

Today, the commercial lease regime is codified in Articles L. 145-1 et seq. of the Commercial Code (Code de commerce). The Pinel Law of 18 June 2014, subsequent laws and their implementing decrees set precise rules for calculating rent (capping, uncapping, commercial rent index…). The logic remains the same: in the event of renewal, the judge takes the effective date of the new lease as the point of reference for determining the applicable legal regime. Informed landlords and tenants now know that they must prepare in advance, by studying the state of the law at the key moment.

Key takeaways

Here are the essentials in Q&A form:

What rule applies to the rent of a renewed commercial lease?
That in force at the effective date of renewal (date of the agreement or, failing that, of the judicial decision).

Can a decree published after the renewal date be invoked by the landlord?
No, unless it contains an express retroactive provision, which is extremely rare in lease law.

What to do if the landlord uses a later text to justify an increase?
Challenge it in writing, recalling the principle of non-retroactivity. In the absence of agreement, refer the matter to the commercial rent judge.

What is the time limit for contesting the renewal rent?
You have two years from the day the rent is known with certainty to bring the matter before the court. After that period, your action may be inadmissible.

How to prove the renewal date?
The written lease, an addendum, an exchange of letters, or any document attesting to the parties’ agreement or the effective date of the new contract suffice. In practice, a private deed or a registered letter with acknowledgment of receipt is ideal.

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