Amendment to a Commercial Lease: When Is It Mandatory and How to Draft It?

A landlord orally agrees that his tenant may now sell food products in addition to its ready-to-wear clothing, but nothing is put in writing. Three years later, at renewal, he challenges that activity and seeks termination of the lease. This type of dispute regularly comes before the courts, although a single document would have secured the position: the amendment (avenant). This guide sets out the cases in which an amendment to a commercial lease becomes legally mandatory (change of activity, rent review, change of surface area), how to draft it without weakening the contract, and the errors that turn a seemingly harmless adjustment into a source of litigation.

What is an amendment to a commercial lease and what is it for

An amendment is a written document that modifies one or more clauses of an existing contract without creating a new contract. Applied to a commercial lease governed by Articles L. 145-1 et seq. of the French Commercial Code, it allows the relationship between landlord and tenant to be adapted while the lease is running, while keeping the original lease as its foundation.

The distinction from renewal is fundamental. Renewal, provided for by Articles L. 145-8 to L. 145-30 of the French Commercial Code, gives rise to a new nine-year lease on expiry of the previous one. An amendment, by contrast, forms part of the lease in progress: it changes one specific parameter (the rent, the permitted activity, the leased surface area, the allocation of service charges) without calling into question its term or its start date. Confusing the two leads to errors in calculating time limits and rent capping.

An amendment to a commercial lease is also distinct from an oral agreement. In law, an oral agreement between landlord and tenant may amount to a modification, but it is almost impossible to prove and leaves the door open to later challenge. A written document is not always a condition of validity, but it is always a condition of security.

Amendment, tolerance and tacit modification

Tolerance calls for caution. Where a landlord allows the tenant to carry on an activity not provided for in the lease for years without reacting, a tacit modification may be invoked, but its extent remains uncertain and open to debate before the court. Tolerance does not replace a formalised agreement: it creates a grey area that each party will interpret to its own advantage. The very function of the amendment is to remove that ambiguity by setting out in writing what is permitted, on what conditions and from what date.

When is an amendment mandatory

No provision contains a single list of the cases requiring an amendment. The obligation results, depending on the situation, either from a statutory formal requirement or from the practical need to secure a substantial modification. Three situations arise most often: a change of activity, a change of rent, and a change of the surface area or composition of the premises.

Change of activity: despecialisation (déspécialisation)

A commercial lease always states the permitted use of the premises, that is, the activity the tenant is authorised to carry on. Carrying on an activity not provided for exposes the tenant to termination for breach of the lease. To change activity, the French Commercial Code imposes a structured procedure, despecialisation, the outcome of which is most often recorded in an amendment.

Partial despecialisation, governed by Article L. 145-47 of the French Commercial Code, allows the tenant to add related or complementary activities to its main activity. The tenant must notify its intention to the landlord by extrajudicial document (acte extrajudiciaire) or by registered letter with acknowledgement of receipt. The landlord has two months to challenge the related or complementary nature of the proposed activities. Take the example of a florist who wishes to sell decorative items: this addition, often regarded as complementary, falls under partial despecialisation.

Article L. 145-47 of the French Commercial Code: "The tenant may add related or complementary activities to the activity provided for in the lease. The tenant must first notify the landlord of its intention, by extrajudicial document or by registered letter with acknowledgement of receipt, specifying the activities it is proposed to carry on."

Full despecialisation, provided for by Articles L. 145-48 to L. 145-55 of the French Commercial Code, allows a change to an entirely different activity, unconnected with the initial activity. The procedure is more demanding: the tenant must show that the change is justified by the economic situation and by the requirements of the rational organisation of distribution, and the landlord may oppose it on serious and legitimate grounds. The change may then entitle the landlord to a modification of the rent.

In both cases, once agreement has been obtained or the procedure completed, the amendment records the new permitted use of the premises. Without it, the tenant operates within a contractual framework that no longer matches reality, which weakens its position at renewal. The landlord's options when faced with the tenant's request (refusing, negotiating or setting conditions) are set out in our article on despecialisation of the commercial lease.

A change of activity may also run up against other regulations. Where the premises are located in a municipality subject to authorisation for change of use, Article L. 631-7 of the French Construction and Housing Code requires administrative authorisation to convert residential premises into commercial premises, regardless of the landlord's agreement. Similarly, Article L. 631-7-1 A of the same Code regulates short-term letting to a transient clientele, a point to check before any tourist accommodation use. An amendment between landlord and tenant never dispenses with planning authorisations.

Change of rent

The rent changes during the lease through several mechanisms, and each may call for an amendment.

Three-yearly review, provided for by Article L. 145-38 of the French Commercial Code, allows each party to request a review of the rent every three years. The variation is in principle capped by the reference index (the commercial rents index or the tertiary activities rents index, depending on the nature of the activity). Where landlord and tenant agree on the new amount, the amendment sets the revised rent and the effective date.

The sliding-scale clause, or indexation clause, governed by Article L. 145-39 of the French Commercial Code, provides for an automatic variation of the rent according to an index. It operates without an amendment, through the clause alone. However, where the operation of the clause results in a variation of more than one quarter compared with the previously fixed rent, a review may be requested, and the parties' agreement will be recorded in an amendment.

An amicable agreement to review the rent, outside any statutory mechanism, remains possible: the landlord and the tenant may freely agree a new rent, for example on the occasion of works or a commercial renegotiation. That agreement must be formalised in an amendment stating the amount, the effective date and, where applicable, the review index applicable for the future. Failing that, proof of the new rent and of how it is to change becomes uncertain.

Change of the surface area or composition of the premises

Where the leased surface area changes, an amendment is necessary to redefine the subject matter of the lease. Extension to a neighbouring unit, return of part of the premises, or the addition of a storeroom or a terrace changes the composition of the leased property and, generally, the amount of the rent.

This change has a direct bearing on rent capping at renewal. A notable change in the characteristics of the leased premises is one of the grounds for removal of the rent cap (déplafonnement) recognised by the French Commercial Code. An amendment that significantly increases the surface area may therefore justify, at renewal, a rent set at the true rental value rather than at the capped rent. The drafting of the amendment must anticipate this consequence and describe the new surface area precisely, ideally with an attached plan.

The carrying out of major works by the landlord, in particular where they improve the premises or alter their structure, follows the same logic. The amendment makes it possible to settle who bears the works, how they affect the rent and how they are documented.

Change of parties and allocation of service charges

Other events justify an amendment without always being mandatory in the strict sense. Any change to the allocation of service charges, taxes and works between landlord and tenant must comply with Article L. 145-40-2 of the French Commercial Code, introduced by Law No. 2014-626 of 18 June 2014, known as the Pinel Law, which requires a precise and exhaustive inventory of categories of charges. Any change to that allocation during the lease is best formalised in an amendment referring to an updated inventory.

A change of landlord, on sale of the building, does not require an amendment since the lease continues by operation of law with the purchaser. By contrast, assignment of the leasehold right (droit au bail) by the tenant, authorised sub-letting or the addition of a co-tenant often give rise to a specific document. Where the change affects the clauses of the lease itself (the assignor's guarantee, joint liability), an amendment sets out the new undertakings.

How to draft an amendment to a commercial lease

An effective amendment rests on a simple principle: it changes what must be changed and leaves everything else intact. Its drafting follows a logic of precision and traceability.

Essential contents

An amendment to a commercial lease must enable a third party, in particular a judge, to understand without ambiguity what has been changed and since when. The following elements must appear in it:

• full identification of the parties, stating their exact capacity (landlord, tenant) and, for a legal entity, its legal representative
• the precise reference to the original lease: date of signature, term, description of the premises, any earlier amendments
• the purpose of the amendment, clearly stated (change of rent, extension of the surface area, addition of an activity)
• the new clause set out in full, replacing the amended clause, the previous wording of which is recalled
• the effective date of the change, distinct from the date of signature
• express confirmation that the other clauses of the lease remain unchanged

This last item, often neglected, prevents a party from claiming that the amendment has implicitly called other provisions into question.

Form and notification

An amendment in principle follows the form of the lease it modifies. If the lease was concluded by notarised deed (acte authentique), an amendment affecting matters subject to land registration (publicité foncière), such as a term exceeding twelve years, must observe the same formalities. For the great majority of amendments, a private agreement (acte sous seing privé) signed by both parties is sufficient, drawn up in as many original copies as there are parties.

Where the amendment results from a despecialisation procedure, the prior notifications must be kept. Proof of notification by registered letter with acknowledgement of receipt or by a document served by a commissaire de justice (bailiff) determines whether the procedure is regular. For a legal entity, Article R. 111-1 A of the French Construction and Housing Code restates the principle that notification is made to the legal or statutory representative and, for property held in joint ownership (indivision), to one of the joint owners, who is responsible for informing the others.

Effective date and fit with the lease

The effective date deserves particular attention. An amendment signed in January may provide for deferred effect, for example on the date of completion of works or on the first day of a calendar quarter. This distinction avoids disputes about the start date of a new rent or a new activity. The amendment must also state how it fits with the lease milestones: it changes neither the nine-year term nor the three-yearly right of termination provided for by Article L. 145-4 of the French Commercial Code, unless expressly stipulated and consistent with the statute.

Errors that weaken the lease

A poorly drafted amendment can do more harm than an oral agreement, because it fixes imprecise wording that will turn against one of the parties.

Formalising a change through a simple informal exchange

Relying on an email, an oral agreement or an amended rent invoice to record a change of activity or rent is a frequent error. In the event of a dispute, the burden of proof becomes a major obstacle. A tenant that carries on a tolerated but unformalised activity risks being met, at renewal, with the absence of any title for that activity. A landlord who has orally agreed to a rent reduction may see that agreement challenged by a purchaser of the building.

Confusing an amendment with a renewal

Treating as an amendment what is in reality a renewal, or the reverse, distorts the calculation of the cap and of time limits. Renewal starts a new nine-year lease and reopens the capping mechanism. An amendment that increases the surface area during the lease, by contrast, may create a ground for future removal of the rent cap. Ambiguous drafting as to the nature of the document deprives the parties of the legal certainty they seek.

Neglecting the impact on the renewal rent

Changing the activity through full despecialisation or significantly increasing the surface area has direct consequences for the renewal rent. A tenant that obtains an advantageous despecialisation without realising that it gives the landlord a right to a review, or a landlord who accepts an extension without reserving removal of the cap, suffers effects that neither anticipated. The amendment must include a forward-looking analysis of its effects at the end of the lease.

Omitting the clause maintaining the other provisions

An amendment that does not state that the other clauses remain unchanged opens a debate about the scope of the modification. Some parties try to exploit this imprecision to argue that the amendment novated the contract, that is, created a new contract extinguishing the old one. Novation is not presumed, but clumsy drafting fuels litigation.

Ignoring administrative authorisations and the co-ownership rules

An amendment authorising a new activity is worthless if that activity is prohibited by the co-ownership rules (règlement de copropriété) or subject to an authorisation for change of use that has not been obtained. A tenant who relies solely on the landlord's agreement may find itself forced to cease trading despite a valid amendment. Checking that the activity is compatible with the co-ownership rules and with planning rules is an essential preliminary.

Changing service charges without complying with the Pinel inventory

Since the Pinel Law of 18 June 2014, the allocation of charges and works between landlord and tenant is subject to specific formal requirements. An amendment that transfers to the tenant charges falling on the landlord without complying with the exhaustive inventory in Article L. 145-40-2 of the French Commercial Code, in particular the major repairs (grosses réparations) of Article 606 of the French Civil Code, risks nullity of the stipulation concerned. Changing the allocation of charges without annexing an updated inventory weakens the amendment. The expenses that may or may not be re-invoiced to the tenant are dealt with separately in our article on the allocation of charges between landlord and tenant.

Conclusion

The amendment is not a mere administrative formality: it is the instrument that ensures the commercial lease faithfully reflects the reality of the relationship between landlord and tenant. Whenever an essential parameter changes (the activity, the rent, the surface area, the allocation of charges), a written document is required, not because a provision always expressly requires it, but because the absence of a written document creates a litigation risk next to which the cost of the amendment is negligible. The position to adopt is clear: a short and precise amendment is better than a generous but indefensible oral agreement.

The most costly error remains the informal modification, the one thought to be harmless that resurfaces at renewal, when the financial stakes are at their highest. Before signing an amendment to a commercial lease, check three points: the conformity of the modification with the provisions of the commercial lease statute, its compatibility with the co-ownership rules and planning authorisations, and its impact on the renewal rent. Have the draft reviewed by a property law professional before signing, as a poorly drafted clause binds both parties for the remaining term of the lease, sometimes several years.

Frequently asked questions

Is an amendment to a commercial lease mandatory in order to change activity? Yes, where the new activity is not provided for in the lease. The change goes through a partial despecialisation procedure (Article L. 145-47 of the French Commercial Code) for related or complementary activities, or a full despecialisation procedure (Articles L. 145-48 to L. 145-55) for a different activity. The amendment records the new permitted use once the procedure has been completed. Carrying on an unauthorised activity without an amendment exposes the tenant to termination of the lease.

Can the rent of a commercial lease be changed without an amendment? The indexation clause, or sliding-scale clause of Article L. 145-39 of the French Commercial Code, varies the rent automatically without an amendment. By contrast, any amicable agreement to review the rent or any negotiated three-yearly review (Article L. 145-38) must be formalised in an amendment stating the new amount, the effective date and the applicable index. Without a written document, proof of the agreed rent becomes very difficult.

Can an amendment change the term of a commercial lease? An amendment can in theory change the term, but in compliance with the commercial lease statute, which sets a minimum term of nine years with a three-yearly right of termination for the tenant (Article L. 145-4 of the French Commercial Code). Extending the lease beyond twelve years may trigger a land registration requirement and a notarised deed. The tax and formal consequences must therefore be checked before the term is changed.

What is the difference between an amendment and a renewal of a commercial lease? Renewal creates a new nine-year lease on expiry of the previous lease and reopens the rent capping mechanism. An amendment modifies a clause of the lease in progress without changing its term or its start date. Confusing the two distorts the calculation of time limits and of the cap, and weakens the parties' position in any later dispute.

Does an oral agreement between landlord and tenant have the same value as a written amendment? Legally, an oral agreement may amount to a modification, but it is almost impossible to prove if challenged. Prolonged tolerance of an activity not provided for may create a tacit modification, but its extent remains uncertain and open to debate before the court. A written document remains the only guarantee of security, in particular on a sale of the building or a change of counterparty.

Must an extension of the leased surface area be the subject of an amendment? Yes, any change to the composition of the premises redefines the subject matter of the lease and must be formalised in an amendment describing the new surface area precisely, if possible with an attached plan. This change is significant because a notable increase in surface area may constitute a ground for removal of the rent cap at renewal. The amendment must anticipate that financial consequence.

Can an amendment transfer charges from the landlord to the tenant? Only within the limits of Article L. 145-40-2 of the French Commercial Code, introduced by the Pinel Law of 18 June 2014, which requires a precise and exhaustive inventory of charges. Certain charges, such as the major repairs of Article 606 of the French Civil Code, cannot be placed on the tenant. An amendment that disregards these rules risks nullity of the stipulation concerned.