You are British, your husband or wife is French, and you want to build your life in France after Brexit. Since 1 January 2021, your British passport no longer gives you an automatic right to live here: the British government itself tells its nationals to check visas and residency before moving to France. Marriage to a French citizen does not replace that paperwork, but it opens two of the strongest doors in French immigration and nationality law. The first door is residence: the foreign husband or wife of a French national is entitled to a one-year temporary residence card marked “vie privée et familiale” (private and family life), then to a ten-year resident card after three years of marriage and regular stay. The second door is nationality: after four years of marriage, or five in some cases, you can become French by declaration, without the discretionary naturalisation procedure. Neither door opens on the wedding certificate alone. Both turn on one phrase that returns in every statute and every court decision: the “communauté de vie”, the shared life, both emotional and material, which must have continued without interruption since the wedding day. Prefectures refuse residence cards when they doubt that shared life; the nationality minister refuses to register declarations for the same reason; and the public prosecutor can still attack a registration obtained by lie or fraud within two years of discovering it, with separation in the twelve months after registration counting as a presumption of fraud. This guide explains each step in plain English, with every French term translated at first use, and shows exactly which court can undo each refusal and within which deadline.

I. Your residence in France as the British spouse of a French citizen

A. Which residence permit the prefecture must issue and what it checks before signing

Start with the principle that surprises many British couples: marriage to a French citizen gives you a right to a residence card, not an exemption from holding one. You must still enter France lawfully, usually on a long-stay visa that matches your situation, and then apply for your first card at the prefecture (préfecture) of your home address, now filed online through the ANEF portal (Administration Numérique des Étrangers en France). In Paris, the competent office is the Préfecture de police. Renewal applications follow a strict calendar set out on the official service-public.fr guidance: file online at the earliest four months and at the latest two months before your current document expires. Missing that window does not automatically destroy your rights, but it hands the prefecture an easy reason to complicate your file, so diary the deadline from the day you receive each card.

The legal basis for your first card is article L.423-1 of the CESEDA, the Code de l’entrée et du séjour des étrangers et du droit d’asile (the code governing entry, stay and asylum). Its wording is mandatory, not discretionary: “L’étranger marié avec un ressortissant français, se voit délivrer une carte de séjour temporaire portant la mention ” vie privée et familiale ” d’une durée d’un an lorsque les conditions suivantes sont réunies : 1° La communauté de vie n’a pas cessé depuis le mariage ; 2° Le conjoint a conservé la nationalité française ; 3° Lorsque le mariage a été célébré à l’étranger, il a été transcrit préalablement sur les registres de l’état civil français.” Three conditions, then, and each one generates its own refusals in practice. The shared life must still exist on the day the prefecture decides. Your French spouse must still be French: if your husband or wife has lost or renounced French nationality, the door closes. And if you married outside France, including in England, Scotland, Wales or Northern Ireland, the marriage must first have been transcribed onto the French civil-status registers. Transcription (transcription sur les registres de l’état civil) means the French consulate or the Service central d’état civil in Nantes copies your foreign marriage certificate into the French system and issues a French acte de mariage. Without that step, the prefecture will declare your file incomplete, however genuine your relationship. Couples who married at a British register office should therefore request transcription as early as possible, because consular checks with the GRO (General Register Office) and legalisation or apostille steps take months.

A second route into the same card helps couples who married in France. Article L.423-2 of the CESEDA provides: “L’étranger, entré régulièrement et marié en France avec un ressortissant français avec lequel il justifie d’une vie commune et effective de six mois en France, se voit délivrer une carte de séjour temporaire portant la mention ” vie privée et familiale ” d’une durée d’un an.” This covers the British partner who entered lawfully, married at the French mairie (town hall), and can show six months of real common life on French soil. It is a useful safety net where the long-stay visa position is debated, because this route does not hold the standard entry condition against you. It does not, however, remove the shared-life test: six months of genuine cohabitation must be proved with documents, not asserted. Related guidance on marrying in France, including the papers filed at the mairie and how to answer a refusal or an opposition to the wedding itself, is covered in our companion piece on getting married in France after Brexit, while the wider landscape of visas and permits for British newcomers is mapped in our long-stay visa and residence permit guide.

Renewal is where many files fail, often years after a smooth first issue. Article L.423-3 of the CESEDA warns that where the break-up of the marriage or of the shared life is established during the card’s validity, the card may be withdrawn, and adds the sentence every renewing spouse should memorise: “Le renouvellement de la carte est subordonné au maintien du lien conjugal et de la communauté de vie avec le conjoint qui doit avoir conservé la nationalité française.” Separation, even without divorce, can therefore cost you the renewal if the shared life has genuinely ended. Two narrow exceptions protect vulnerable spouses. Where the marriage ends through the death of the French spouse, the break is not held against the survivor. And where shared life broke down because of domestic or family violence suffered by the foreign spouse, or because the foreign spouse was trapped in a polygamous situation, the break is likewise not held against them, and a spouse who suffered violence after arriving in France but before the first card was issued can still be granted the card if the other conditions are met. These shields come from articles L.423-4 and L.423-5 of the CESEDA, and they matter far beyond theory: a British widow or widower, or a British spouse fleeing an abusive French partner, keeps a route to stay that a purely discretionary system would close.

The finishing line of the residence track is the ten-year card. Article L.423-6 of the CESEDA states: “L’étranger marié depuis au moins trois ans avec un ressortissant français se voit délivrer une carte de résident d’une durée de dix ans à condition qu’il séjourne régulièrement en France depuis trois ans et que la communauté de vie entre les époux n’ait pas cessé depuis le mariage, que le conjoint ait conservé la nationalité française et, lorsque le mariage a été célébré à l’étranger, qu’il ait été transcrit préalablement sur les registres de l’état civil français.” Three years of marriage plus three years of regular stay open the ten-year carte de résident (resident card), subject to the republican integration conditions of article L.413-7, which cover the language level and the civic commitments France expects from long-term residents. Practically, this means keeping an unbroken paper trail from day one: joint tax notices (avis d’imposition), joint tenancy agreements or title deeds, electricity and insurance bills in both names, bank statements showing shared expenses, and, where relevant, birth certificates of children born to the couple. The prefecture judges continuity over years, and a file with one bill per year looks thin next to a file with quarterly evidence across the whole period. Our guide on becoming French by naturalisation explains how the same integration logic is tested when you later seek citizenship by decree, a different route from the declaration examined in Part II below.

B. When the authorities doubt the marriage itself: sham-marriage checks, opposition and annulment

Before any card or declaration, the marriage must survive the suspicion of being a “mariage blanc” (sham marriage) or a “mariage gris” (where one spouse’s consent is real but obtained by deceit about the other’s intentions). The mayor’s office (mairie) can interview the couple separately before the wedding and refer the file to the public prosecutor (procureur de la République) where the answers diverge. Article 175-1 of the Civil Code gives the prosecutor a sharp weapon at that stage: “Le ministère public peut former opposition pour les cas où il pourrait demander la nullité du mariage.” An opposition (opposition à mariage) blocks the ceremony until a court rules, and it must be challenged quickly before the tribunal judiciaire (judicial court) if the wedding is to go ahead. After the wedding, the attack takes the form of an annulment action (action en nullité). Article 184 of the Civil Code allows any marriage contracted in breach of the core consent and capacity rules to be attacked “dans un délai de trente ans à compter de sa célébration, soit par les époux eux-mêmes, soit par tous ceux qui y ont intérêt, soit par le ministère public.” Thirty years is a long sword, and the prosecutor wields it against unions celebrated only to obtain papers or nationality.

Two court decisions show how judges actually handle these attacks, and both help honest couples understand what evidence counts. In a published Bulletin ruling of 19 September 2019, pourvoi No 18-19.665, the First Civil Chamber of the Court of Cassation (Cour de cassation) held that courts cannot raise the thirty-year time bar on their own initiative: “il en résulte que les juges du fond ne pouvaient relever d’office la prescription trentenaire de l’action en nullité du mariage célébré le 8 avril 1981, prévue à l’article 184 du code civil”. The full decision is published at Cour de cassation, 1re civ., 19 September 2019, No 18-19.665. The lesson for British spouses is procedural but real: limitation arguments must be raised by a party, and a court that annuls your marriage without anyone pleading limitation has not necessarily protected you. More importantly, the same ruling confirms that sham is judged on the spouses’ intention at the wedding ceremony itself: the Versailles appeal court lawfully deduced absent consent from the facts surrounding a Las Vegas ceremony presented to friends as a ritual without consequences, never transcribed in France, and followed by separate family lives. A British-French couple with shared housing, shared money and shared plans has nothing to fear from that test, but a couple living apart from the start, with no shared documents and contradictory statements at interview, walks directly into it.

If the prefecture refuses your residence card, the refusal letter (décision de refus) will usually arrive with an order to leave France, the OQTF (obligation de quitter le territoire français). Article L.611-1 of the CESEDA is blunt: “L’autorité administrative peut obliger un étranger à quitter le territoire français lorsqu’il se trouve dans les cas suivants”, and its third case is precisely the foreigner whose residence card, renewal or interim document has been refused or withdrawn. The official guidance then sets the counter-moves. Against an explicit refusal, you can file an informal appeal to the prefect (recours gracieux) or to the Interior Minister (recours hiérarchique), and you can litigate before the administrative court (tribunal administratif), with deadlines of 48 hours, 15 days or 30 days depending on the type of OQTF attached. Where the prefecture simply stays silent for four months, the silence counts as an implied refusal (décision implicite de rejet), and you then have two months to file those same appeals or go to court. The full official procedure is set out on the service-public.fr page for the vie privée et familiale card. Never let an OQTF deadline pass while waiting for an informal answer: file the court challenge in time and mention the pending gracious appeal inside it, because only the judge can suspend removal.

II. Becoming French by declaration because you married a French citizen

A. The four conditions, the file and the interview that decides its fate

Nationality by declaration (déclaration de nationalité) is not a favour: where every legal condition is met and duly proved, the minister must register it. The conditions sit in article 21-2 of the Civil Code, and the article deserves to be read in full: “L’étranger ou apatride qui contracte mariage avec un conjoint de nationalité française peut, après un délai de quatre ans à compter du mariage, acquérir la nationalité française par déclaration à condition qu’à la date de cette déclaration la communauté de vie tant affective que matérielle n’ait pas cessé entre les époux depuis le mariage et que le conjoint français ait conservé sa nationalité. Le délai de communauté de vie est porté à cinq ans lorsque l’étranger, au moment de la déclaration, soit ne justifie pas avoir résidé de manière ininterrompue et régulière pendant au moins trois ans en France à compter du mariage, soit n’est pas en mesure d’apporter la preuve que son conjoint français a été inscrit pendant la durée de leur communauté de vie à l’étranger au registre des Français établis hors de France. En outre, le mariage célébré à l’étranger doit avoir fait l’objet d’une transcription préalable sur les registres de l’état civil français. Le conjoint étranger doit également justifier d’une connaissance suffisante, selon sa condition, de la langue française, dont le niveau et les modalités d’évaluation sont fixés par décret en Conseil d’Etat.”

Unpack that paragraph into a checklist, because each limb has ended real files. First, duration: four years of marriage at the declaration date is the standard, rising to five where you cannot show three continuous years of regular residence in France since the wedding and cannot show that your French spouse was registered with the French living abroad (registre des Français établis hors de France) during your shared life overseas. British couples who married in London in 2021, lived in the United Kingdom until 2024 without consular registration, and then moved to Lyon will therefore usually wait for the five-year mark. Second, uninterrupted shared life, emotional and material, from the wedding day to the declaration day: the same communauté de vie as for residence, tested even harder, because nationality is permanent. Third, your spouse must have been French on the wedding day and still be French at the declaration date. Fourth, transcription of any foreign marriage, exactly as for the residence card. Fifth, sufficient French, assessed at an interview (entretien d’assimilation) covering language and civic knowledge; the required level and test method are fixed by décret en Conseil d’État (a government decree made after review by the Council of State), so check the current threshold before filing rather than relying on old forum posts. Added by the official guidance, three negative conditions: hold a valid residence permit when filing if you are a non-EEA national, which every British declarant is; not be subject to any deportation order (arrêté d’expulsion) or ban from French territory (interdiction du territoire français) still in force; and clear the criminal-record bar, namely no unsuspended prison sentence of six months or more in France and no conviction for a crime against the fundamental interests of the Nation or for terrorism, subject to rehabilitation or removal from the second part of the criminal record (bulletin n°2 du casier judiciaire).

The file itself is heavy and formulaic, which is good news: formulaic means controllable. You lodge two signed copies of the official form cerfa No 15277, co-signed by your French spouse, with recent identity photographs, plus civil-status documents, proof of the marriage and its transcription where needed, proof of continuous shared life across the whole qualifying period, proof of residence regularity, the language evidence, and foreign criminal-record extracts for every country where you lived more than six months in the last ten years. The process costs 255 euros in tax stamps (timbres fiscaux), reduced to 127.50 euros in Guyana, and the official guidance warns that no other state charge applies besides that stamp, so any private website charging for an appointment is selling you nothing official. After the assimilation interview, the platform hands you a receipt (récépissé), and the clock starts: the file goes to the ministry in charge of naturalisations with a reasoned opinion within six months of signature, and the ministry has one year from the receipt to refuse registration, extended to two years where government opposition proceedings are opened. Silence at the end of that period means registration, which is why keeping the receipt and proving its date matters enormously. All of these steps, fees and time limits are confirmed on the service-public.fr page for nationality by marriage declaration.

B. Refusal, government opposition and annulment: which judge, which deadline, which evidence

Three different attacks can hit your declaration, and each goes to a different judge on a different clock. Confusing them is the costliest mistake in this field. First, the refusal to register (refus d’enregistrement): the ministry decides that at least one legal condition is missing and notifies a reasoned decision. You then have six months to challenge it before the court of your place of residence, and representation by an avocat (a lawyer admitted to a French bar) is compulsory. Second, the government opposition (opposition du Gouvernement): even where every condition looks met, the Government may block acquisition by decree in the Council of State for indignity (indignité) or for lack of assimilation other than linguistic (défaut d’assimilation). Article 21-4 of the Civil Code frames it: “Le Gouvernement peut s’opposer par décret en Conseil d’Etat, pour indignité ou défaut d’assimilation, autre que linguistique, à l’acquisition de la nationalité française par le conjoint étranger dans un délai de deux ans à compter de la date du récépissé prévu au deuxième alinéa de l’article 26 ou, si l’enregistrement a été refusé, à compter du jour où la décision judiciaire admettant la régularité de la déclaration est passée en force de chose jugée.” You have two months to challenge that decree before the Council of State (Conseil d’État), again with an avocat mandatory. Note the traps the article plants inside assimilation: an actual polygamous situation, or a conviction for sexual assault on a child under fifteen, automatically counts as lack of assimilation. Third, even a registered declaration is not untouchable: article 26-4 of the Civil Code lets the public prosecutor contest the registration within two years of its completion where the legal conditions were not satisfied, and within two years of discovering them where there was lie or fraud (mensonge ou fraude). Its final sentence is the one divorcing couples discover too late: “La cessation de la communauté de vie entre les époux dans les douze mois suivant l’enregistrement de la déclaration prévue à l’article 21-2 constitue une présomption de fraude.” Separate within a year of registration and the law presumes the declaration was fraudulent; you can rebut the presumption, but the burden has moved onto you.

The two most recent court decisions on this terrain both turned on the shared-life evidence, and both deserve close reading by any British applicant. On 21 January 2026, the First Civil Chamber rejected pourvoi No 24-14.593 in a case where the declaration had been signed on 16 February 2018 and registered on 27 July 2018, while the spouses had signed divorce-acceptance minutes (procès-verbal d’acceptation du divorce) on 11 January 2018 and divorced in March 2019. The Court approved the appeal judges’ reasoning in terms every applicant should memorise: “En vertu de l’article 21-2 du code civil, l’étranger ou apatride qui contracte mariage avec un conjoint de nationalité française peut, après un délai de quatre ans à compter du mariage, acquérir la nationalité française par déclaration à condition qu’à la date de cette déclaration la communauté de vie tant affective que matérielle n’ait pas cessé entre les époux depuis le mariage et que le conjoint français ait conservé sa nationalité”, adding the decisive gloss: “Il en résulte que la communauté de vie tant affective que matérielle doit exister dans les liens du mariage.” Cohabitation under the same roof until the non-conciliation order, the Court accepted, “ne suffisaient pas à caractériser une communauté de vie affective” where both spouses had willingly opted for divorce. The full ruling is available at Cour de cassation, 1re civ., 21 January 2026, No 24-14.593. The same ruling usefully confirms the human-rights backstop: nationality decisions are reviewed under article 8 of the European Convention on Human Rights through the two-step test of arbitrariness and concrete consequences for private life, citing the Karassev, Ramadan and Ghoumid case law, but the test saved no one where the legal conditions were plainly unmet and no statelessness, removal or concrete hardship beyond residence was shown.

Six months later, the Lyon judicial court showed the mirror image: a declaration failing for lack of proof rather than proof of breakdown. In its judgment of 1 July 2026, RG No 23/00097, the tribunal rejected a demand for registration where the claimant, married since 24 March 2016 and declaring on 24 December 2021, offered only a 2024 notarial certificate of a joint property purchase, an October 2024 electricity bill, and his wife’s testimony. The court’s finding is a template for what not to file: the claimant “ne rapporte pas la preuve de l’existence d’une communauté de vie affective et matérielle des époux du jour du mariage au jour de la souscription de la déclaration, soit du 24 mars 2016 au 24 décembre 2021”, the documents post-dated the relevant period, and the spouse’s statement alone was insufficient. The judgment is available at Tribunal judiciaire de Lyon, 1 July 2026, No 23/00097. Together, the two rulings draw the evidentiary map: cover every year of the qualifying period with joint documents in both names, never rely on a single witness even if it is your spouse, and remember that separation or divorce proceedings before the declaration date will be read as the end of emotional shared life even while you still share an address. Successful registration ends with the mention required by article 28 of the Civil Code in the margin of your birth record; a refusal ends with the six-month dash to the local court described above, where these same evidence rules decide the outcome.

Conclusion

Marriage to a French citizen gives a British spouse two distinct legal tracks, and each rewards the couple that documents its shared life from the first day. For residence, the one-year vie privée et familiale card under article L.423-1, or article L.423-2 for those married in France, leads to renewal under article L.423-3 and to the ten-year resident card under article L.423-6, provided the marriage is transcribed, the French spouse stays French, and the shared life never breaks. For nationality, article 21-2 opens declaration after four or five years on the same shared-life foundation plus language, clean record and valid stay, with registration challengeable for two years and presumed fraudulent if shared life ends within twelve months. Against refusal, remember the three clocks: two months to the administrative court for a residence refusal with its OQTF, six months to the judicial court for a nationality refusal, two months to the Council of State against a government opposition, each with a lawyer compulsory on the nationality side. Build the file before trouble arrives, keep every joint bill and tax notice, transcribe the English marriage early, and treat each deadline as the substance of the right itself.