In France, managing a rental investment is governed by strict legislation designed to balance the rights of landlords and tenants. In the face of inflation and the housing crisis, the issue of rent increases has become a major concern for landlords wishing to maintain the profitability of their property, as well as for tenants concerned about their purchasing power. Whether you are an experienced landlord or a foreign resident discovering the subtleties of French real estate law, this comprehensive guide details precisely what the law allows you to do, and what it formally prohibits regarding rent reassessments.
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Under French law, setting and reviewing the rent of a residential lease (primary residence) is mainly governed by Law No. 89-462 of July 6, 1989. This fundamental text distinguishes several situations: the annual review during the lease term, the increase upon lease renewal, and the adjustment following improvement works.
For several years, the legislature has considerably strengthened tenant protections, notably through rent control in high-demand areas and restrictions linked to the energy performance of housing.
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The annual review is the most common method for increasing rent. It is not automatic: it must meet very precise conditions of form and substance.
To be able to review the rent each year, the lease agreement must contain an express revision clause. In the absence of this clause, the rent must remain identical throughout the entire duration of the lease (excluding renewal or works).
The increase cannot be set freely. It is legally capped by the IRL (Indice de Référence des Loyers / Rent Reference Index), published quarterly by INSEE (the French National Institute of Statistics and Economic Studies). This index corresponds to the average, over the last twelve months, of the evolution of consumer prices excluding tobacco and housing rents.
The increase is calculated using the following formula:
$$\text{New rent} = \frac{\text{Current rent excluding service charges} \times \text{New reference IRL}}{\text{Reference IRL of the previous year}}$$
To cope with skyrocketing inflation, Law No. 2022-1158 on emergency measures to protect purchasing power introduced a bouclier loyer (rent shield). This mechanism capped the increase of the IRL at 3.5% in metropolitan France (between 2% and 3.5% in Corsica, and 2.5% in overseas territories) until May 15, 2024. Since that date, the IRL has returned to its classic calculation method but remains under close state surveillance.
This is a major rule resulting from the "Climate and Resilience" Law of August 22, 2021: since August 24, 2022, any rent review is strictly prohibited for properties classified F or G on the Diagnostic de Performance Énergétique (DPE / Energy Performance Certificate).
This ban applies to new contracts, renewals, and ongoing leases (whether unfurnished or furnished). If your accommodation is considered a thermal sieve, you can no longer increase the rent, even if the lease contains a revision clause.
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Upon expiration of the lease (after 3 years for a private individual landlord renting unfurnished, or 1 year for furnished), the landlord can propose a rent increase if they believe the rent is manifestly underestimated compared to local market prices.
The landlord cannot arbitrarily set the new amount. They must provide proof of this underestimation by supplying precise references.
Even if the underestimation is proven, the applicable increase is regulated (Article 17-2 of the Law of July 6, 1989):
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If the landlord carries out major improvement works in the property at their own expense, they can agree with the tenant on a rent surcharge.
These must be works that bring real added value to the property (e.g., installing a fitted kitchen, fitting double glazing, completely rewiring the electricity). Routine maintenance or repair work (e.g., painting following water damage, replacing an outdated boiler with an identical model) does not allow for a rent increase.
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If your property is located in a municipality that applies encadrement des loyers (rent control) (such as Paris, Lille, Lyon, Villeurbanne, Bordeaux, Montpellier, or the municipalities of Plaine Commune and Est Ensemble in Île-de-France), you must respect a double limit:
1. The rent cannot exceed the Loyer de Référence Majoré (increased reference rent) set by prefectoral decree (except for an exceptional rent supplement, which is strictly regulated).
2. When changing tenants, the rent of the new tenant cannot exceed the rent applied to the previous tenant, revised according to the IRL (unless the rent was manifestly underestimated or significant works were carried out).
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$$\text{New rent} = \frac{900 \times 145.89}{141.29} = \text{€929.30}$$
$$\text{Maximum annual increase} = 4,000 \times 15\% = \text{€600 per year}$$
$$\text{Maximum monthly increase} = \frac{600}{12} = \text{€50 per month}$$
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For a rent increase to be legally valid and indisputable, the landlord must scrupulously follow these steps:
Before taking any steps, check the DPE rating. If it is F or G, no increase is possible. Also, verify the presence of the revision clause in the lease.
Use official public service simulators or the IRL formula presented above. Round to the nearest euro cent.
The notification must be sent to the tenant. Although the law does not impose a strict format for the annual review, it is highly recommended to send a letter recommended with acknowledgment of receipt (lettre recommandée avec accusé de réception - LRAR) or to hand-deliver it against a signed and dated receipt.
Since the Alur Law of 2014, the landlord has a period of 1 year from the revision date specified in the lease to claim the increase. If the landlord expresses their intent to revise the rent late, the revision only takes effect from the date of the request. Retroactivity is now prohibited (you cannot claim missed increase amounts for past months retroactively).
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No, if the lease contains a revision clause and the calculation respects the IRL, the tenant cannot object to it. If they refuse to pay the difference, they put themselves in a situation of partial unpaid rent, which can lead to the termination of the lease. However, they can contest the calculation if there is an error or if the DPE is rated F or G.
In the event of a disagreement over a proposed increase for an underestimated rent, either the landlord or the tenant must refer the matter to the Commission Départementale de Conciliation (CDC / Departmental Conciliation Commission). If no agreement is reached before the CDC, the landlord must bring the case before the protection litigation judge (juge des contentieux de la protection) before the end of the lease, otherwise the lease will be renewed under the previous conditions.
Yes. The annual IRL revision rules apply in the exact same way to flatshare leases (whether it is a single joint lease or multiple individual leases), provided that the revision clause is present in each flatmate's contract.
The government provides an official online simulator ("Est-on en zone tendue ?"). High-demand zones mainly concern large French urban areas where housing demand significantly exceeds supply.
In a high-demand zone, the rent of the new tenant cannot exceed that of the previous tenant, unless the property has undergone significant improvement works or the rent was manifestly underestimated. Outside high-demand zones, the landlord is free to set the new rent for re-letting, subject to respecting the ban linked to thermal sieves (F and G).
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