You own a flat in Paris and you rent it out. One morning, your tenant’s letter arrives by registered post: your rent exceeds the legal ceiling, the complément de loyer (rent supplement) must go, and several thousand euros of overpaid rent must come back. For a foreign landlord, this is the moment when the Paris encadrement des loyers (rent cap) stops being an abstract French rule and becomes a dispute with deadlines, a mandatory conciliation step and a judge at the end of the road.

This guide explains, for non-resident owners letting in Paris, how the cap works in practice, what your lease must contain, how to defend a supplement when the tenant attacks it, and what happens at renewal when the rent is manifestly too low. It is built on the texts in force, official guidance and recent court decisions, including two Court of Cassation rulings of 4 December 2025 that every Paris landlord should know. Each step below comes with the document to prepare and the trap to avoid. Our Paris real estate practice handles these disputes for owners who live abroad.

I. The Paris rent cap in practice: reference rents, ceilings and the compulsory lease wording

A. The reference rent, the increased reference rent and the ceiling you cannot cross

Since the ELAN framework, Paris has applied a ceiling system to new residential lettings and renewals. Every year the préfet sets, by order, reference rents per square metre broken down by letting type, number of rooms, construction period and neighbourhood. The June 2026 prefectoral order currently in force continues that annual cycle. Your starting point is therefore never the market price your agent suggests: it is the loyer de référence (reference rent) and the loyer de référence majoré (increased reference rent, the reference plus 20 percent) applicable to your exact flat on the day the lease is signed. The official simulator hosted by the Paris regional housing authority lets you look up those figures address by address before you sign anything: the Paris reference-rent simulator run by the regional housing authority.

The rule itself is simple to state and strict to apply. The loyer de base (base rent) written into the lease may not exceed the increased reference rent. Only a justified complément de loyer (rent supplement) may be added on top, and it must be named, quantified and justified in the lease itself. The lease must therefore mention the reference rent, the increased reference rent and, where one is charged, the supplement with its reasons. A lease that omits these figures is already in breach on paper, before any debate about the market. The official public-service page on supplements makes referral to the departmental conciliation board (CDC) a compulsory first step before any court action over a supplement. That board is therefore a mandatory staging post, not an optional mediation, and its opinion starts the clock for the court stage.

The underlying contract remains an ordinary letting of a dwelling, and the Civil Code defines it in one sentence worth keeping in mind throughout: “Le louage des choses est un contrat par lequel l’une des parties s’oblige à faire jouir l’autre d’une chose pendant un certain temps, et moyennant un certain prix que celle-ci s’oblige de lui payer.” That is Article 1709 of the Civil Code. In English: a letting is a contract by which one party undertakes to let the other enjoy a thing for a certain time, for a certain price the other undertakes to pay. The price term is therefore fully part of the contract the judge will read, and in Paris that price term is read together with the ceiling. Foreign owners sometimes assume that a high purchase price, heavy renovation costs or a mortgage in another currency justify a higher rent. They do not. The ceiling is computed from the official tables, not from your cost base, and no clause can contract out of it.

Practical file to assemble before signing or renewing a Paris lease: the simulator printout for your address with the reference and increased reference figures, the construction-period evidence for the flat (the tables depend on it), the exact lease wording with the three figures, and, if you charge a supplement, a separate written justification kept with the lease file. The most frequent trap is copying last year’s figures or a neighbouring flat’s numbers. Reference rents change every year and vary by micro-zone, room count and building age. A supplement of even a few dozen euros that is not justified feature by feature is recoverable by the tenant with several years of arrears attached, as the judgments below show.

B. The rent supplement: an exception you must prove, feature by feature

The complément de loyer is the only lawful way to exceed the increased reference rent, and the courts treat it as a narrow exception. The supplement must correspond to comfort or location features that are decisive for setting the rent, assessed against comparable homes of the same category in the same geographical area, and features already paid for through service charges cannot be counted again. Two rulings of the Third Civil Chamber of the Court of Cassation dated 4 December 2025, both rejecting tenants’ appeals, show exactly where the line sits and how a landlord’s file succeeds.

In the first case (appeal no. 24-17.930), the tenant of a sixteen-square-metre studio challenged a 120-euro supplement added to a 440-euro base rent, arguing that calm and light are shared by every flat in the street and that the lift, paid for through charges, could not justify the supplement. The Court of Cassation upheld the supplement. Its key sentence reads: “la cour d’appel, qui a procédé aux recherches prétendument omises, a pu en déduire que le complément de loyer était fondé” (Cass., 3rd civ., 4 Dec. 2025, no. 24-17.930). In English: the court of appeal, having carried out the allegedly omitted investigations, was entitled to conclude that the supplement was well founded. The decisive facts were that the flat was bright and quiet, rare and highly sought-after qualities in Paris, coming not from the general location already reflected in the reference rent but from the high floor, with the lift treated only as the equipment that lets the tenant enjoy a high floor’s advantages without its drawbacks. The lesson for landlords: describe the feature precisely (floor, orientation, light, quiet), tie it to the flat itself rather than to the neighbourhood, and never present as a feature something the tenant already pays for in the charges.

In the second case (appeal no. 24-15.589), the landlord charged a supplement of 6.20 euros per square metre for a flat with an unobstructed view of a prestigious historic church, from the fourth floor directly facing it. The tenants argued that countless Paris flats overlook churches and that one view cannot justify a supplement. The Court of Cassation again rejected the appeal: “ce dont elle a pu déduire que la bailleresse était fondée à réclamer, en sus du loyer de référence majoré applicable, un complément de loyer dont elle a souverainement apprécié le montant” (Cass., 3rd civ., 4 Dec. 2025, no. 24-15.589). In English: the court was entitled to conclude that the landlady could charge, on top of the applicable increased reference rent, a supplement whose amount it assessed at its own discretion. Two points matter for your file. First, the view had to be specific and personal to the flat: immediate proximity, direct outlook, upper floor. A generic “nice view” would not have survived. Second, once the feature is established, the amount of the supplement is for the lower courts to assess freely, which means your file should also support proportionality: size of the flat, level of the base rent, and concrete comparison points.

The reverse image is just as instructive. On 26 February 2026 the protection-litigation judge in Paris annulled a supplement outright and ordered the landlord couple to repay 4,818.68 euros of supplement collected since October 2024, including the portion folded into the deposit, plus an order to sign an amendment deleting the supplement: “ANNULE le complément de loyer stipulé au contrat de bail” (Paris Judicial Court, 26 Feb. 2026, no. 25/05963). In English: the rent supplement written into the lease is annulled. When the feature file is empty or generic, the supplement falls, the money comes back, and the lease must be rewritten. Build your supplement file the way that judge reads it: dated photographs, floor plans showing orientation and floor level, a short list of same-category lettings in the same streets without the feature, and proof that the feature is not already billed through the charges récupérables (recoverable service charges). The Paris housing advice agency’s tenant fact sheet confirms the same reading from the other side of the table: the Paris housing advice agency (ADIL 75) tenant fact sheet.

II. The tenant challenges your rent: conciliation, the judge and your defences

A. Mandatory conciliation first, then the protection judge within three months

When your tenant disputes the rent or the supplement, the procedure is fixed and the deadlines are short. The tenant must first refer the matter to the commission départementale de conciliation (departmental conciliation board). If the board brokers an agreement, the agreed rent applies from the start of the lease. If disagreement persists, the tenant has three months from receiving the board’s opinion to ask the juge des contentieux de la protection (protection-litigation judge) to cancel or reduce the supplement. Miss that three-month window and the court route closes; respect it and the judge re-examines everything, including restitution of the excess collected.

Restitution is where the financial exposure concentrates. In a Paris judgment of 7 July 2026, the judge ordered a landlord to repay 5,058.72 euros of overpaid contractual rent and fixed the rent going forward: “CONDAMNE M. [P] [H] à payer à Mme [Y] [Q] la somme de 5 058,72 au titre du trop-perçu de loyers contractuel (échéance de mai 2026 incluse)” (Paris Judicial Court, 7 July 2026, no. 25/05108). In English: the landlord is ordered to pay the tenant 5,058.72 euros for contract rent overpaid (May 2026 instalment included). Note the mechanics that matter for a non-resident owner: the overpayment is computed month by month back to the start of the disputed period, the judge resets the running rent, and ancillary orders (works, diary of charges, costs) can be added in the same judgment. Interest, procedural costs and the tenant’s legal costs come on top. A 100-euro monthly excess becomes roughly 3,600 euros over three years before costs, which is why answering the conciliation summons seriously, with figures and comparables, is almost always cheaper than ignoring it.

Your defence file at the conciliation stage should contain five items: the simulator printout for the signing date, the lease with its three figures, the supplement justification with dated evidence, proof of any works or equipment behind the claimed features, and your computation of the tenant’s claim so you can negotiate from verified numbers rather than impressions. Never respond by imposing a rent increase, threatening non-renewal or cutting services: retaliation hardens the file and can generate separate claims. If conciliation fails, instruct counsel admitted before the Paris court early, because the three-month referral deadline runs against the tenant but your statement of defence, counter-evidence and any counterclaim for arrears must be ready for the first case-management hearing. Owners living abroad should also give their property manager a written authority limited to factual matters, keeping litigation decisions and settlement authority with themselves or their lawyer.

A Paris-specific point. These cases are heard in Paris, conciliation runs through the Paris board, and the reference tables applied are the Paris tables for the year of the lease. Keep every document in French or with a certified translation ready: the board and the judge work in French, and an English-only file slows you down. The same Paris route applies whether you own directly, through a French société civile immobilière (non-trading property company) or through a foreign structure: the cap attaches to the dwelling, not to the owner’s residence or vehicle. If you let through a company, make sure the lease identifies the correct lessor and that the person signing for the company has authority, because a capacity defect gives the tenant a second front to attack.

B. At renewal: raising a manifestly undervalued rent, and protecting the rest of the lease

The cap also governs renewals, but in the other direction: when the rent is manifestly undervalued, the landlord may propose a revaluation at renewal. The case law sets a demanding standard of proof, and landlords lose whenever the comparison file is thin. In a 2014 ruling, the Court of Cassation rejected tenants who fought a revaluation, leaving the increase standing: “D’où il suit que le moyen n’est pas fondé” (Cass., 3rd civ., 17 Dec. 2014, no. 13-24.360). In English: it follows that the ground of appeal is unfounded. The lower court had properly found, with reasons and without being required to investigate unprompted, that the rent was manifestly undervalued. The method that wins is therefore the classic one: a reasoned comparison with equivalent lettings in the same area, at the renewal date, documented exhibit by exhibit.

The mirror case every landlord should read is the 2011 société civile immobilière (non-trading property company) decision. A landlord company proposed a revalued renewal rent, the tenants refused, and the courts dismissed the company for want of proof: the lower court had duly concluded that manifest undervaluation was not established, and the Court of Cassation rejected the company’s appeal (Cass., 3rd civ., 12 Oct. 2011, no. 10-21.214). In English: the appeal is rejected. Owning through an SCI changes nothing about the burden of proof. And timing rules can destroy even a good file: in a 24 November 2021 cassation, the Court quashed a Paris appeal ruling that had applied the wrong transitional regime to an old renewal procedure, recalling that earlier procedural steps survived only while the new article’s conditions were not yet met, and it annulled the whole ruling: “CASSE ET ANNULE, en toutes ses dispositions, l’arrêt rendu le 29 mai 2020, entre les parties, par la cour d’appel de Paris” (Cass., 3rd civ., 24 Nov. 2021, no. 20-18.411). In English: quashes and annuls, in all its provisions, the judgment of 29 May 2020 of the Paris Court of Appeal. Renewal litigation is won on procedure as much as on price: serve the renewal offer in the correct form and time, go through conciliation where required, and calendar every deadline from the offer date.

While you fight about the price, protect the rest of the lease, because tenants under pressure counterclaim on condition and charges. The Civil Code imposes three duties you must be able to evidence. First, delivery of a decent dwelling and maintenance: “Le bailleur est tenu de délivrer la chose en bon état de réparations de toute espèce.” That is Article 1720 of the Civil Code. In English: the lessor must deliver the thing in a good state of repair of every kind. Second, the warranty against defects that prevent use, even unknown to you: “Il est dû garantie au preneur pour tous les vices ou défauts de la chose louée qui en empêchent l’usage, quand même le bailleur ne les aurait pas connus lors du bail.” That is Article 1721 of the Civil Code. In English: the lessee is owed a warranty for all vices or defects of the let thing that prevent its use, even if the lessor did not know of them when the lease was made. Damp, heating failure or persistent noise that you dismiss as minor can therefore return as a rent-reduction claim inside your own price case. Third, the inventory presumption: “S’il n’a pas été fait d’état des lieux, le preneur est présumé les avoir reçus en bon état de réparations locatives, et doit les rendre tels, sauf la preuve contraire.” That is Article 1731 of the Civil Code. In English: if no inventory of condition was drawn up, the tenant is presumed to have received the premises in a good state of tenant repairs, and must return them so, unless the contrary is proved. Without a careful move-in and move-out état des lieux (inventory of condition), you will struggle to defend both the deposit and any dilapidation claim, and the broader delivery duty in Article 1719 of the Civil Code frames the whole picture.

Two final practical warnings for foreign owners. First, tax: French-source rents are reportable and taxable in France under domestic rules and the applicable treaty, and the method of holding (direct, SCI, foreign company) changes the filing, not the existence of the obligation. Treat this as a flag to take tailored tax advice, not as tax advice itself. Second, never sign a renewal offer, a conciliation agreement or a lease amendment under time pressure while abroad without having the French text checked: these documents reset your rent for years and are read literally by the judge. A short review before signature costs little; a wrong figure compounds monthly. Further background on letting disputes and owner remedies is available through our Paris real estate team.

Conclusion

The Paris rent cap rewards the landlord who documents and punishes the one who improvises. Check the reference and increased reference figures for your exact flat before every signature, write all three figures into the lease, and justify any supplement with features that belong to the dwelling itself, evidenced feature by feature. If the tenant challenges you, treat the conciliation board as the decisive round: bring numbers, comparables and proof, negotiate from verified figures, and calendar the three-month court deadline. At renewal, a manifestly undervalued rent can be raised, but only with a comparison file that survives judicial reading and with every procedural step served on time. Keep the dwelling in demonstrably good repair and the inventories complete, so a price dispute does not turn into a condition dispute. Handled this way, a Paris letting remains a stable investment even for an owner who lives thousands of kilometres away.