Rent control in 2026: how the maximum rent is actually determined in Catalonia's stressed market areas
The combined application of Law 12/2023, the “Ley de Arrendamientos Urbanos” —the LAU, Spain's urban tenancies act— and Catalan housing legislation has produced in Catalonia a complex system for determining the initial rent in stressed residential market areas. The maximum rent depends on whether or not there was a previous contract in the last five years, on whether the landlord is a “gran tenedor” —a large-scale landlord—, on the state reference price index and on the exceptions for improvement works or long-term contracts. This paper sets out, from a practical standpoint, how the initial rent is determined in Catalonia in 2026, addressing situations such as contracts with no previous tenancy, the passing on of expenses, improvement works, dwellings previously let by rooms and changes in floor area or conditions.
1.Stressed market areas and the concept of “gran tenedor” in Catalonia
Law 12/2023 allows the “comunidades autónomas” —Spain's autonomous regions— to declare stressed residential market areas where certain circumstances of excessive household burden, or of price increases above the “IPC” (Spain's consumer price index), are present. The Generalitat, Catalonia's regional government, has exercised that power, first declaring 140 stressed municipalities in March 2024 and adding a further 131 in October 2024, so that a very significant part of the Catalan rental market is today subject to rent control. Law 12/2023 itself defines the general concept of “gran tenedor” —large-scale landlord— as the individual or legal entity holding more than ten urban properties for residential use or more than 1,500 m² of residential use, with the possibility of tailoring it in stressed market areas down to a threshold of five residential properties within the declared area. Catalonia has made use of that power, so that in stressed municipalities anyone holding five or more residential properties in the area is regarded as a large-scale landlord, which widens the number of landlords subject to the stricter regime of art. 17.7 LAU. In parallel, Law 18/2007 on the right to housing contains its own definition of large-scale landlord, which covers financial institutions, investment funds and individuals or legal entities with ten residential properties in Spain or five in Catalonia, with certain exceptions for social housing developers and non-profit bodies. That definition is coordinated with the state definition for the purposes of information, registration and rent-control obligations.
2.The state framework: art. 17 LAU and the state reference price index
Law 12/2023 amends the LAU by introducing a rent-control regime in stressed market areas. Art. 17.6 provides that, where the property is located in an stressed residential market area, the rent agreed at the start of the new contract may not exceed the last rent under the principal-residence tenancy in force in the last five years over the same dwelling, updated in accordance with the indexation clause, and no new chargeable items may be added that were not in the previous contract. An additional increase of no more than ten per cent over that last rent is allowed only in a closed list of cases: refurbishment works meeting the requirements of the “Reglamento del IRPF” (Spain's personal income tax regulations); energy improvements with a certified saving in non-renewable primary energy of at least thirty per cent; duly certified accessibility improvements; or long-term contracts of ten years or more, or with an equivalent right of extension. Art. 17.7 adds a specific regime for cases in which the landlord is a large-scale landlord and the property is located in a stressed market area. In those cases, the rent agreed at the start of the new contract may not exceed the maximum price limit applicable under the system of reference price indices, having regard to the conditions and characteristics of the dwelling and of the building. That same limit applies where there has been no principal-residence tenancy in the last five years, provided that the ministerial order approving the index and the declaration of the stressed market area so provide. Law 12/2023 provides for the creation of a state system of reference indices for rental prices, to be drawn up using data from the “Agencia Tributaria” (Spain's tax authority), the “Catastro” (the property cadastre), the “Registro de la Propiedad” (the Land Registry), the rental deposit registers and other sources representative of the market. In April 2026 the State updates the methodology and the data of that system, improving its territorial accuracy and its ability to reflect the characteristics of dwellings, in technical coordination with the Generalitat, which already had an index of its own based on INCASÒL data.
3.Determining the initial rent: previous rent, state index and large-scale landlord
In practice, determining the initial rent in Catalonia in 2026 calls for a sequence of questions to be worked through. First, it must be checked whether the dwelling is located in an area currently declared a stressed residential market. If it is not, the freedom to set the rent under art. 17.1 LAU applies, without prejudice to other sector-specific limits. If the dwelling is in a stressed market area, it must be determined whether there has been a principal-residence tenancy in force in the last five years over that same dwelling. If there has, the general rule is that the maximum rent will be the last rent under that contract, updated in accordance with the indexation clause, with no possibility of introducing new chargeable items. That rent may be exceeded by no more than ten per cent, and only where the improvement works or the long duration provided for in art. 17.6 are present. If there has been no principal-residence tenancy in the last five years, a distinction must be drawn according to whether the landlord is a large-scale landlord. If it is not, the rent is determined by agreement between the parties, but may not exceed the maximum price resulting from applying, where appropriate, the state index where the declaration of the stressed market area so provides. If the landlord is a large-scale landlord, the maximum rent will be set by the state reference price index, whether or not there is a previous contract, provided that the ministerial order approving the index and the declaration of the stressed market area have extended its application to dwellings with no previous contract. In Catalonia, the tailoring of the concept of large-scale landlord to five properties within the stressed market area means that a significant number of landlords fall under that index rule, which in practice shifts the centre of gravity of rent determination towards the state reference system.
4.Contracts with no previous tenancy in the last five years
One of the most problematic situations is that of dwellings with no principal-residence tenancy in the last five years. These may be newly built dwellings, dwellings that have stood empty, second homes that are turned over to permanent letting, or dwellings that have been exploited under other regimes, such as tourist letting or letting by rooms. In these cases, if the landlord is not a large-scale landlord, the LAU does not as a general rule impose a rent limit based on the index, unless the declaration of the stressed market area and the ministerial order on the index have expressly extended its application to such cases. Where the landlord is a large-scale landlord, by contrast, art. 17.7 does provide that the rent may not exceed the maximum price limit applicable under the system of reference indices, and Law 12/2023 itself provides that this limit is also to apply to dwellings with no previous contract where the ministerial order so states. In practice, in Catalonia, where coordination between the state index and the regional index has been close, the tendency is to apply the state index as the main reference for these cases, particularly where the landlord is a large-scale landlord. The practical usefulness of the index is plain: it provides a range of rent values per square metre for dwellings with given characteristics within a census district or territorial area, which makes it possible to set an objective and verifiable maximum price.
5.Chargeable expenses and the structure of the rent
Determining the maximum rent is not exhausted by the nominal figure of the monthly rent; it requires an analysis of the structure of the financial consideration. The LAU allows the parties to agree that the general expenses for the proper upkeep of the property, its services, taxes, charges and liabilities not capable of individual allocation are to be borne by the tenant, provided that the agreement is in writing and the annual amount of those expenses is stated. However, in stressed market areas and in contracts subject to rent control, Law 12/2023 and the Catalan legislation insist that no new chargeable items may be introduced that were not in the previous contract, and that agreements or contractual structures may not be used to circumvent the rent limits. Law 18/2007, in its art. 66 quinquies, defines rent, price or financial consideration as any monetary or economically assessable amount that the tenant must pay, directly or indirectly, as consideration for the use, enjoyment or availability of the dwelling or the room, including amounts treated as rent, general expenses, individualised services, fees, the passing on of expenses and compulsory services. It expressly prohibits passing on property management and contract formalisation costs to the tenant in matters of rent control, and declares of no effect any legal transaction, agreement or contractual structure designed to circumvent the rent-control regime. In practice, this means that, in order to check compliance with the rent limit, one must add together not only the agreed monthly rent but also any other amount the tenant is required to pay as a condition of using the dwelling, excluding only individually metered utilities and other items that the legislation allows to be passed on without their forming part of the rent. The authorities and the courts will have to analyse case by case whether particular items, such as service charges, additional services or furniture, form part of the rent for rent-control purposes or may be regarded as falling outside it.
6.Improvement works and the exceptions under art. 17 LAU
Art. 17.6 LAU allows the maximum rent, in certain cases, to be increased by up to ten per cent over the last updated rent. Those cases are refurbishment works within the meaning of the personal income tax regulations, energy improvement measures with a certified saving in non-renewable primary energy of thirty per cent, duly certified accessibility improvements, and long-term contracts of ten years or more or with an equivalent right of extension. The practical application of these exceptions raises several questions. First, the works must have been completed in the two years before the new contract is entered into, and the landlord must provide documentary evidence of their nature, scope and cost and, in the case of energy improvements, of the saving achieved, by means of energy performance certificates from before and after the works. Second, the ten per cent increase is a ceiling, not an automatic entitlement: the parties may agree a lower increase or even keep the previous rent. Third, the increase applies to the last updated rent and not to the index, so that in large-scale landlord cases subject to the state index the compatibility between the increase for improvements and the index limit may give rise to interpretative tensions. A prudent reading is that the increase for improvements cannot take the rent above the index limit where the landlord is a large-scale landlord, unless the state legislation or the order approving the index expressly provides otherwise.
7.Dwellings previously let by rooms and changes in conditions
A particularly delicate situation is that of dwellings which, in recent years, have been let by rooms, under several simultaneous contracts, and which come to be let as a single dwelling. Law 18/2007, in its art. 66 ter, provides that letting a dwelling by rooms, or any other physical or contractual fragmentation, does not alter its character as a residential tenancy or avoid the application of the rules proper to it, and that, in dwellings located in stressed market areas, the sum of the rents agreed under several room contracts may not exceed the maximum rent applicable to the letting of the dwelling as a single unit. This raises the question of what the “última renta” (last rent) is for the purposes of art. 17.6 LAU where the dwelling has been let by rooms. A reasonable solution is to take the last reference rent to be the sum of the room rents, provided that they are principal-residence tenancies and not contracts for other uses, and to treat that sum, once updated, as the ceiling on which any increase for improvements is to be applied. However, the absence of a single contract and the possible diversity of dates and conditions of the room contracts complicate the calculation. In such cases, the state reference price index can play a fallback role, particularly where the landlord is a large-scale landlord, providing an objective limit that avoids the need to reconstruct a single rent from fragmented contracts.
Changes in the floor area or in the conditions of the dwelling also bear on the determination of the maximum rent. Where the dwelling has undergone works that significantly alter its usable floor area, its layout or its features, the state index, which is based on square metres and on the characteristics of the dwelling, will reflect those changes, whereas the reference to the last rent may become out of step. The legislation offers no express solution for these situations, but the logic of the system suggests that, where the works amount to a substantial improvement of the dwelling, the landlord may rely on the exception for improvements under art. 17.6, always within the ten per cent limit, and that the state index should operate as an additional reference in order to prevent disproportionate increases.
8.Conclusions
Determining the initial rent in Catalonia in 2026 in stressed residential market areas calls for an integrated reading of the LAU, Law 12/2023 and Catalan housing legislation. The maximum rent depends on whether there was a previous contract in the last five years, on whether the landlord is a large-scale landlord, on the state reference price index and on the exceptions for improvement works or long-term contracts. Where there is no previous contract, where the dwelling was previously let by rooms, or where there have been significant changes in floor area or conditions, the state index takes on a special prominence, particularly where the landlord is a large-scale landlord. The structure of the rent, including chargeable expenses and other financial items, must be analysed carefully in order to prevent the use of avoidance agreements that undermine rent control. The Catalan legislation, by defining rent broadly and prohibiting the passing on of certain expenses, reinforces that requirement. Taken as a whole, the system offers a relatively complete framework for determining the maximum rent, but its practical application will call for intensive interpretative work by the authorities and the courts, as well as for constant attention to the evolution of the indices and of the declarations of stressed market areas.
