How to increase the rent of a dwelling subject to the 1948 law?
Verified 03 August 2026 - Public Service / (Prime Minister)
The rent of a unit rented under the so-called of the law of 48 can be increased every year. It may also be increased exceptionally, after amending works have been made. But it has to be done according to a scale. We explain.
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Every year
The rules are different depending on whether the accommodation is located in Paris, Hauts-de-Seine, Seine-Saint-Denis, Val-de-Marne and some municipalities of Seine-et-Marne, Yvelines, Essonne, Val-d'Oise.
Commune concerned in Île-de-France
Rent can be increased to 1er July of each year.
The applicable rate of increase shall be:
- 0.78% from 1er July 2026
- 1.40% of 1er July 2025 to June 30, 2026
FYI
It is forbidden to increase the rent of a dwelling classified in category IV.
But after this increase, the rent cannot exceed one maximum amount.
To know this maximum amount, you must multiply the corrected surface housing by the base price per m2.
The base price per m2 to be used depends on the housing category :
Base price per m² of corrected area | ||
|---|---|---|
For each of the first 10 m² | For each other m² | |
II A | €14.11 | €8.37 |
II B | €9.70 | €5.20 |
II C | €7.44 | €3.93 |
III A | €4.49 | €2.38 |
III B | €2.66 | €1.38 |
IV | €0.26 | €0.12 |
Example :
For Type II C housing, with a corrected surface area of 43 m2 :
(€7.44 x 10) + (€3.93 x 33) = €204.09
The annual increase shall not result in the rent being higher than €204.09.
Other municipality
Rent can be increased to 1er July of each year.
The applicable rate of increase shall be:
- 0.78% from 1er July 2026
- 1.40% of 1er July 2025 to June 30, 2026
FYI
It is forbidden to increase the rent of a dwelling classified in category IV.
But after this increase, the rent cannot exceed one maximum amount.
To know this maximum amount, you must multiply the corrected surface housing by the base price per m2.
The base price per m2 to be used depends on the housing category :
Base price per m² of corrected area | ||
|---|---|---|
For each of the first 10 m² | For each other m² | |
II A | €11.52 | €6.87 |
II B | €7.94 | €4.32 |
II C | €6.06 | €3.26 |
III A | €3.68 | €2.06 |
III B | €2.19 | €1.15 |
IV | €0.26 | €0.12 |
Example :
For Type II C housing with a corrected surface area of 43 m2 :
(€6.06 x 10) + (€3.26 x 33) = €168.18
The annual increase shall not result in the rent being higher than €168.18.
After amending works
The rules are different depending on whether the accommodation is located in Paris, Hauts-de-Seine, Seine-Saint-Denis, Val-de-Marne and some municipalities of Seine-et-Marne, Yvelines, Essonne, Val-d'Oise.
Commune concerned in Île-de-France
Type of works
The landlord can increase the rent when elements, which served as a basis for setting the initial rent, have been modified.
This is particularly the case when improvement works lead to a change in housing category.
But as a result of this increase, the rent must not exceed one maximum amount.
To know this maximum amount, you must multiply the corrected surface housing by the base price per m2.
The base price per m2 to be used depends on the housing category :
Base price per m² of corrected area | ||
|---|---|---|
For each of the first 10 m² | For each other m² | |
II A | €14.11 | €8.37 |
II B | €9.70 | €5.20 |
II C | €7.44 | €3.93 |
III A | €4.49 | €2.38 |
III B | €2.66 | €1.38 |
IV | €0.26 | €0.12 |
Example :
For Type II C housing, with a corrected surface area of 43 m2 :
(€7.44 x 10) + (€3.93 x 33) = €204.09
The annual increase shall not result in the rent being higher than €204.09.
Approach
The owner must notify the proposed increase to the tenant:
- Either by registered mail with acknowledgement of receipt
- Either by act of commissioner of justice (formerly act of judicial officer).
The notification shall state:
- The new basic elements (precisely) that justify an increase in the rent
- The counting of the modified surface following the works carried out.
The tenant has 2 months to contest this modification by registered letter with acknowledgement of receipt.
In case of disagreement, the owner or tenant can seize the protection litigation judge the court on which the rented accommodation depends.
Other municipality
Type of works
The landlord can increase the rent when elements, which served as a basis for setting the initial rent, have been modified.
This is particularly the case when improvement works lead to a change in housing category.
But as a result of this increase, the rent must not exceed one maximum amount.
To know this maximum amount, you must multiply the corrected surface housing by the base price per m2.
The base price per m2 to be used depends on the housing category :
Base price per m² of corrected area | ||
|---|---|---|
For each of the first 10 m² | For each other m² | |
II A | €11.52 | €6.87 |
II B | €7.94 | €4.32 |
II C | €6.06 | €3.26 |
III A | €3.68 | €2.06 |
III B | €2.19 | €1.15 |
IV | €0.26 | €0.12 |
Example :
For Type II C housing with a corrected surface area of 43 m2 :
(€6.06 x 10) + (€3.26 x 33) = €168.18
The annual increase shall not result in the rent being higher than €168.18.
Approach
The owner must notify the proposed increase to the tenant:
- Either by registered mail with acknowledgement of receipt
- Either by act of commissioner of justice (formerly act of judicial officer).
The notification shall state:
- The new basic elements (precisely) that justify an increase in the rent
- The counting of the modified surface following the works carried out.
The tenant has 2 months to contest this modification by registered letter with acknowledgement of receipt.
In case of disagreement, the owner or tenant can seize the protection litigation judge the court on which the rented accommodation depends.
Who can help me?
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The informants who answer you belong to the ministry in charge of housing and urban planning.
- Departmental Agency for Housing Information (Adil)
List of municipalities concerned in Île-de-France
Rent setting: Articles 26 to 44