You bought your two-bedroom flat near the Canal Saint-Martin in 2017, when a British passport still opened every door in France. Since Brexit you spend school holidays and long weekends there, and for the rest of the year the flat pays its own charges on a short-stay platform: a few hundred pounds a night in May, full occupancy during the Olympics afterglow, a cleaner on speed dial. Then, last spring, a letter from the Ville de Paris arrived at your London address. Agents had logged thirty-seven separate arrivals in your building in one year. You are summoned to explain yourself, and the letter mentions a civil fine of up to 100,000 euros per flat, plus an order to return the property to residential use. This scenario is now routine. Paris employs a dedicated enforcement unit that cross-checks platform listings, electricity consumption and caretaker statements, and British second-home owners are over-represented in its files for one simple reason: the tolerance that protects most Parisian hosts only covers a main home, and your Paris flat is not yours in that legal sense. Your London house is. This article explains, for a British owner who lives in the United Kingdom and lets a Paris or Ile-de-France flat furnished by the night, what you may do without any permit, when letting becomes a change of use that needs prior authorisation, what Paris demands by way of compensation, what the fine procedure looks like, how the rents are taxed, what your co-owners can say about it, and how to challenge an order or a fine step by step.

I. Letting your Paris second home by the night: what is allowed and which authorisation you need

A. Your Paris flat is a second home, so the 120-day tolerance does not protect you

French tourist-letting law starts from a definition. Article L. 324-1-1 of the Tourism Code provides that, and I quote, “les meublés de tourisme sont des villas, appartements ou studios meublés, à l’usage exclusif du locataire, offerts à la location à une clientèle de passage qui n’y élit pas domicile et qui y effectue un séjour caractérisé par une location à la journée, à la semaine ou au mois” (article L. 324-1-1 du code du tourisme). In plain English: a self-contained furnished flat offered by the night, week or month to passing guests who do not live there. Your Airbnb listing matches that definition exactly, and calling it a holiday home on the listing changes nothing.

Since the ELAN statute of 2018, anyone who offers a tourist furnished flat must first file a prior declaration through the national teleservice, and the declaration states whether the flat is the host’s main home within the meaning of article 2 of the statute of 6 July 1989, which is the law that defines a main home as the dwelling occupied at least eight months a year. Where the flat is a main home, the same article caps letting at 120 days per calendar year in the communes that apply the prior-authorisation regime, and platforms must block listings that exceed it. That 120-day tolerance is the rule most newspaper articles describe, and it is the rule that does not apply to you. A British owner who lives and works in London, whose children attend school in Surrey or Edinburgh, and who spends perhaps sixty nights a year in Paris cannot credibly claim the Paris flat as a main home. French case law measures the main home by real, stable occupation, not by affection, and utility bills for a flat empty ten months a year prove the opposite of what you need.

The consequence is stark. Every night you let your second home to passing guests counts, from night one, as tourist letting of a dwelling that is not your main home. There is no de minimis allowance, no first-30-nights pass, no distinction between letting through a platform and letting through a word-of-mouth agency in South Kensington that places British families in Paris for half-term. If the flat is in Paris, in any commune of the inner ring, or in any of the listed communes where the housing shortage justifies control, you need the change-of-use authorisation described in the next section before the first paying guest arrives. Owners sometimes object that they declared the flat with the mairie and display a registration number on the listing, so they must be compliant. Registration and authorisation are two different steps. The registration number proves you declared the activity; it does not prove the activity is lawful in planning terms. The Cour de cassation said so expressly in a published ruling of 27 June 2024, holding that, and I quote, “alors qu’une décision de classement en meublé de tourisme ne peut se substituer à l’autorisation de changement d’usage prévue à l’article L. 631-7 du code de la construction et de l’habitation” (Cass. 3e civ., 27 June 2024, no. 23-13.131, published in the Bulletin). A classification star, a registration number and a change-of-use permit are three separate papers, and only the third answers the mairie’s question.

Three narrow exceptions exist, and British owners should check them before assuming the worst. A nine-month lease to a student is not tourist letting. A mobility lease of one to ten months for a person in temporary professional mobility is not tourist letting either, since it falls under Title I ter of the 1989 statute and article L. 632-1 of the Construction and Housing Code, which provides that, and I quote, “Une location d’un logement meublé constituant la résidence principale du preneur est soumise au titre Ier bis de la loi n° 89-462 du 6 juillet 1989” (article L. 632-1 du code de la construction et de l’habitation). And letting your main home stays within the 120-day tolerance. None of these fits a second home let by the night, but the student and mobility routes matter if you decide to stop short stays and switch to a compliant medium-term strategy, which section II discusses. If you own through a French property company, a société civile immobilière, note that the company never has a main home at all, so every tourist night needs authorisation, a point the Paris courts apply strictly.

For readers who also hold a longer let in the same building, the boundary with ordinary residential letting is worth keeping in mind. Our companion guide for British landlords explains the unfurnished rulebook, from the one-year repair clock to recovering unpaid rent (British landlord in France: unfurnished letting, unpaid rent and recovery). Tourist letting sits outside that regime entirely, with its own permits, its own fines and its own judges.

B. Turning a dwelling into a tourist flat is a change of use: prior authorisation and Paris compensation

The keystone text is article L. 631-7 of the Construction and Housing Code, which states, and I quote, “Le fait de louer un local meublé à usage d’habitation en tant que meublé de tourisme, au sens du I de l’ article L. 324-1-1 du code du tourisme , constitue un changement d’usage au sens du présent article” (article L. 631-7 du code de la construction et de l’habitation). Change of use, changement d’usage, is a planning concept, not a tax label: the flat remains physically a flat, but legally it stops being a dwelling and becomes a commercial-style use, which the commune may authorise in advance or refuse. The regime applies in Paris and in the communes the government lists because of housing pressure, which covers the whole of Paris, most of the petite couronne and the larger towns of the grande couronne, so a British-owned studio in Boulogne-Billancourt, Saint-Denis or Versailles faces the same question as a flat in the Marais.

Authorisation is personal, local and conditional. Article L. 631-7-1 of the same code provides that, and I quote, “L’autorisation préalable au changement d’usage est délivrée par le maire de la commune dans laquelle est situé l’immeuble” (article L. 631-7-1 du code de la construction et de l’habitation), and the same article adds that it, and I quote, “Elle peut être subordonnée à une compensation sous la forme de la transformation concomitante en habitation de locaux ayant un autre usage”. Compensation means you give housing back to the city in exchange for the housing you remove: in practice, converting an office or shop of equivalent surface into a dwelling in the same arrondissement, or buying a commerciality right from a specialist operator. In Paris, compensation is compulsory for second homes, the ratios are demanding, often one-to-one with a location constraint in the same arrondissement, and the cost routinely exceeds the price of the studio being converted. Authorisation dies with its holder’s activity and does not automatically pass to a buyer, so purchasing a flat advertised as Airbnb-friendly transfers no right at all unless the authorisation is personal to you and still current. Any agreement signed in breach of the article is void by operation of law, which means a management mandate for illegal short stays can unravel when money is at stake.

The Cour de cassation has defined the trigger with precision. In a leading Paris ruling of 18 February 2021, the court approved a conviction where the evidence showed repeated short stays by passing guests without any permit, recalling that, and I quote, “le fait de louer, à plus d’une reprise au cours d’une même année, un local meublé pour une durée inférieure à un an, telle qu’une location à la nuitée, à la semaine ou au mois, à une clientèle de passage qui n’y fixe pas sa résidence principale au sens de l’article 2 de la loi du 6 juillet 1989 constitue un changement d’usage d’un local destiné à l’habitation et, par conséquent, est soumis à autorisation préalable” (Cass. 3e civ., 18 February 2021, no. 17-26.156), and it confirmed that the French regime complies with the European services directive. Two practical points follow. First, the test is cumulative and factual: more than one letting in the same year, each under a year, to guests who do not make the flat their main home. A single housesitting favour for friends is not caught; your thirty-seven platform stays are. Second, evidence comes from the mairie’s sworn officers, whose reports the courts accept, and from platform data the city now obtains directly. Arguing that bookings were really medium-term stays fails when check-in records show two-night turnovers.

Paris adds its own layer of paperwork. Since the 2024 Joanna Nasrin framework, every tourist furnished flat must carry the national registration number on its listing, and Paris cross-references listings against its permit files automatically. Display the number and you are traceable; omit it and you commit a separate offence with its own fine. Separately, the flat must be declared for the taxe de séjour, the visitor tax the city collects per person per night, which your platform usually collects but which remains your legal responsibility if the intermediary defaults. Owners who bought before Brexit sometimes produce a planning permission for interior works and present it as proof the use is lawful. The code answers that directly: a town-planning permission that changes a building’s destination proves nothing unless accompanied by a change-of-use authorisation. Keep the two files apart in your mind, because the mairie’s lawyers certainly do.

For a British second-home owner, the honest arithmetic is therefore the following. Nightly letting of a second home in Paris requires a personal change-of-use authorisation with paid compensation, which for most individual owners costs more than the expected rental profit over several years. The compliant alternatives are a nine-month student lease, a one-to-ten-month mobility lease to a genuinely mobile tenant, a classic one-year furnished lease where the tenant makes the flat a main home, or a return to personal use. Each of these escapes the tourist definition, each has its own tax treatment, and each should be documented as carefully as the tourist file you are closing, because the enforcement unit reads sudden conversions with professional suspicion.

II. When the mairie acts: fines, tax and co-ownership trouble, and how a British owner answers from London

A. The control visit, the fine of up to 100,000 euros and the return-to-housing order: challenging each step, including from Paris and the inner suburbs

Enforcement in Paris follows a well-rehearsed script. Sworn officers of the city log the listing, photograph the key box, question the caretaker and, where the pattern justifies it, book a test stay. Their report goes to the mayor, who issues a formal notice demanding that you stop and regularise. If you continue, the city applies to the president of the judicial court for a civil fine and a return-to-housing order. Article L. 651-2 of the Construction and Housing Code provides that the offender, and I quote, “est condamnée à une amende civile dont le montant ne peut excéder 100 000 € par local irrégulièrement transformé” (article L. 651-2 du code de la construction et de l’habitation), pronounced by the president ruling under the fast-track procedure on the merits, with the proceeds paid to the commune. Paris routinely seeks fines calibrated to the illicit profit, often 10,000 to 50,000 euros for a first case, plus a daily penalty, astreinte, running until the flat genuinely returns to residential use. The 2021 Cali Apartments ruling shows the mechanism working exactly as designed: repeated short stays proved, no permit produced, infringement established, fine imposed, and the appeal rejected with an additional 3,000 euros in costs.

Your defences are factual, procedural and legal, in that order, and they must be prepared together. Factually, the city must prove the flat was a dwelling and that you let it repeatedly to passing guests. Challenge the use history where it is genuinely challengeable: article L. 631-7 deems a dwelling by reference to its use between 1970 and 1976 or at any point in the previous thirty years, with the burden of proving unlawful use on the party alleging it, so a flat that has been an office since 1998 with proper paperwork is not a dwelling at all. Challenge the letting pattern where the records overstate it: family stays without payment are not lettings, and a winter spent by your own daughter revising for A-levels is occupation, not clientele. Keep every proof a British non-resident uniquely holds: Eurostar and flight records, school calendars showing where the children were, London council tax bills proving your main home is in England, French electricity curves showing personal occupation between lets, taxe d’habitation notices for second homes, which since Brexit confirm the flat is declared as a résidence secondaire and cut against any claim you pretended otherwise. Our guide on the second-home surcharge explains how that tax now bites British owners and which papers it generates (Your French second home and the 60 percent tax surcharge).

Procedurally, read the summons with a diary in hand. The fast-track judge checks standing, the regularity of the officers’ reports and the proportionality of the fine, and recent Paris orders show judges reducing sums where the owner stopped promptly and produced accounts. Never ignore a hearing because you live in London: instruct a Paris avocat, file evidence in French with sworn translations of the English documents, and ask for time to regularise where a student or mobility lease is genuinely available. The British-desk file-opening line for owners who receive a mise en demeure is +33 6 46 60 58 22, and experience shows that files opened in the week of the first letter settle for far less than files opened after the summons.

Where the dispute concerns the authorisation itself, a refusal, a withdrawal or a compensation demand you consider unlawful, the remedy is administrative. Ask the mayor for reconsideration with full documents, then appeal to the administrative court within the classic time limit: article R. 421-1 of the Administrative Justice Code states, and I quote, “La juridiction ne peut être saisie que par voie de recours formé contre une décision, et ce, dans les deux mois à partir de la notification ou de la publication de la décision attaquée” (article R. 421-1 du code de justice administrative). For a Paris flat that means the tribunal administratif de Paris, with interim relief available where an order threatens irreparable harm. Paris and Ile-de-France specifics matter here. In Paris the file goes through the bureau de la protection des logements, whose officers know every platform trick; in the inner suburbs the competent authority may be the intercommunal body rather than the commune itself, so address your reconsideration to the right signatory or lose two months. Communes outside the listed zones cannot impose the regime at all, which is a complete defence worth checking first for flats in the outer grande couronne: if the commune never voted the regime, no authorisation was ever needed. Finally, keep the criminal vocabulary out of your letters. Unauthorised letting is punished by a civil fine, not a prosecution, and calling yourself guilty of fraud in writing helps nobody.

B. The money side in Paris and Ile-de-France: income tax on the rents, social charges and the co-owners who say no

Fines are only half the bill. Tourist rents received by a British owner are French-source income, taxable in France under the France-United Kingdom double tax treaty, with the United Kingdom giving credit for the French tax under the treaty relief articles (the treaty text and HMRC guidance are published on gov.uk, France tax treaties). In France the default regime for small furnished portfolios is the micro-BIC scheme of article 50-0 of the General Tax Code, which applies, and I quote, to businesses whose turnover “n’excède pas, l’année civile précédente ou la pénultième année” the statutory thresholds (article 50-0 du code général des impôts), with a flat 50 percent allowance for ordinary furnished letting and a higher allowance for classified tourist flats, the balance taxed at the progressive scale. Above the thresholds, or by election, the real-profit regime lets you deduct the caretaker, the platform commission, the insurance, the interest and depreciation of the furniture, which for a heavily managed Paris flat usually beats the flat allowance. Non-resident owners pay the same computation with the minimum-rate mechanism and, on top of income tax, the social levies on rental income at the rate applicable to non-residents affiliated to another EU, EEA or Swiss scheme only where the affiliation proof holds; since Brexit a British owner affiliated solely to the UK system needs individual advice, because the exemption that once flowed from European coordination no longer operates automatically.

Two traps catch British owners in particular. The first is the professional-furnished-landlord boundary. Article 155 of the General Tax Code draws the line between the non-professional regime and the professional regime, with the latter triggered above 23,000 euros of annual receipts combined with a predominance condition (article 155 du code général des impôts), and professional status changes loss relief, social contributions and the capital-gains clock. A Paris two-bedroom let 200 nights a year at 250 euros a night crosses the receipts threshold in spring, so compute the position before the mairie does it for you. The second trap is the undeclared-account reflex: rents paid into a UK account must still be declared in France, foreign accounts declared on the special form, and platform statements kept for the audit window. France and the United Kingdom exchange platform-seller data automatically, and the Ville de Paris fine file has a habit of migrating to the tax office. Our guide on declaring UK rental income from France explains the mirror-image mechanics of treaty credit that apply when the rents flow the other way (British in France: declaring UK rental income and treaty credit).

Then there is the co-owners, the managing agent and the neighbours. Most Paris co-ownership rules, règlements de copropriété, contain a clause limiting the building to bourgeois, purely residential occupation. Decades of Cour de cassation rulings hold that repeated short stays with constant turnover breach such a clause even without proven nuisance, because the coming and going itself contradicts residential use, while a clause that expressly tolerates furnished letting allows it. Read your own règlement before the neighbour’s avocat does: the destination clause sits near the front, and any vote that authorised or refused tourist letting is minuted in the last three years of general-meeting records your syndic must provide. Where the clause forbids it, the syndicat can sue for an injunction and damages independently of the mairie, and judges order platforms’ calendars produced. Where the clause is silent or permissive, the meeting can still restrict future tourist use by vote, and Paris co-owners increasingly do. Practical compliance also means house rules that actually work: a named local contact reachable at midnight, a noise bond in the booking terms, professional linen rather than suitcases dragged across the landing at 1 a.m., and the building’s visitor-tax declaration filed even when the platform claims to handle it. These details decide whether the caretaker who logs your thirty-seven arrivals describes you to the mairie’s officers as a careful neighbour or as the problem of the staircase.

A final Paris and Ile-de-France checklist closes the money side. Register the flat and display the number on every listing. Collect and remit the taxe de séjour or verify in writing that the platform does. Insure the flat as a tourist activity, because a standard multirisque habitation excludes paying guests and the insurer will find the listing faster than you expect. If the flat sits in a building with a gardien, assume every arrival is logged. If it sits in the outer suburbs beyond the listed zones, verify with the mairie in writing that no authorisation regime applies and keep the letter. And if you hold the flat through an SCI, remember the company route changes the tax computation and removes the main-home argument entirely, a topic our SCI guide covers for British families (British parents gifting SCI shares: tax, divorce and splits).

Conclusion

A British second home in Paris can still earn its keep, but the nightly-let model that worked in 2017 now runs through a permit that Paris prices beyond most owners’ reach. The law is settled: tourist letting of a second home is a change of use from the first night, the 120-day tolerance belongs to main homes only, a registration number or a classification star never replaces the mayor’s authorisation, and the fine of up to 100,000 euros per flat is imposed by a judge who has seen every excuse. The sensible sequence is therefore to audit the flat honestly, count the nights, read the co-ownership rules, compute the tax, and choose between regularising with compensation, switching to a student or mobility lease, returning to personal use, or selling while the file is still clean. Each path has its paperwork and its deadlines, and the two-month administrative appeal clock starts running whether you are in Paris or in London. Owners who act on the first letter keep every option; owners who wait for the summons fund the commune.