Marriage in France is a civil act before anything else. The religious ceremony, the chateau reception and the photographs change nothing in law: what makes you married is the ten minutes in front of the registrar at the town hall, the mairie, when the officier de l’état civil, the civil registrar, reads the law to you and you exchange consent. Since Brexit, that civil core has not moved, but everything around it has become heavier for British couples. You are third-country nationals now. Your birth certificate comes from a system France does not fully understand, your country issues none of the certificates French registrars ask every foreigner to produce, and if the registrar doubts your intentions, the interview and the prosecutor’s opposition procedure that follow are conducted entirely in French legal logic. This article walks the whole path in order: the file you lodge at the mairie and the British answer to the missing certificates, the banns, the interview and how an opposition or a refusal is challenged before the courts, then what the wedding changes for your property and how an English wedding is recognised in France. Every decisive statement below rests on the statute or the reported decision quoted with it.
I. Getting Married at the French Mairie When One Partner Is British
A. Which papers the registrar demands, and the British answer to the certificat de coutume problem
Start with the place, because couples get this wrong first. French law lets you choose between few, strictly listed town halls: “Le mariage sera célébré, au choix des époux, dans la commune où l’un d’eux, ou l’un de leurs parents, aura son domicile ou sa résidence établie par un mois au moins d’habitation continue à la date de la publication prévue par la loi.” That is article 74 of the Civil Code in its current wording. In practice, the mairie of the commune where one of you lives, or where a parent lives, celebrates the marriage, provided one month of continuous residence is shown at the date of the banns. A holiday home in the Dordogne with no resident partner and no resident parent does not qualify, however long you have owned it. Check this before booking anything, because everything else flows from the chosen mairie, and each mairie applies the same national rules with its own local habits on appointments and document checks.
Next, capacity: who is legally allowed to marry. French private international law submits each future spouse to their own national law: “Les qualités et conditions requises pour pouvoir contracter mariage sont régies, pour chacun des époux, par sa loi personnelle.” That is article 202-1 of the Civil Code. For the British partner, that means English, Welsh, Scottish or Northern Irish law according to their domicile within the United Kingdom. Whatever that personal law says, one condition is imposed by France in every case: consent. “Il n’y a pas de mariage, lorsqu’il n’y a point de consentement.” That is article 146 of the Civil Code, six words that carry the whole French law of sham and forced marriage, to which we return below. Same-sex couples are expressly covered by the second half of article 202-1, so a marriage between two men or two women, or between a British partner and a French partner of the same sex, can be celebrated at the mairie like any other.
The file itself, the dossier de mariage, is governed by article 63 of the Civil Code, which opens with the banns: “Avant la célébration du mariage, l’officier de l’état civil fera une publication par voie d’affiche apposée à la porte de la maison commune.” The publication, the publication des bans, states your first names, surnames, occupations, domiciles and residences and the place of celebration. The same article then lists what each of you must hand over: the documents required by articles 70 or 71, meaning essentially the birth certificate; proof of identity through a document issued by a public authority, in practice the passport; the full details of your witnesses; and, where relevant, proof that the adult under a protection measure has been informed through the person in charge of that measure. Identity, filiation, domicile, witnesses: that is the skeleton of every file.
For the British partner, the birth certificate is the first practical test. The official guidance on marriage in France on service-public.fr states: you must provide a birth certificate showing parentage that is no more than six months old Filiation means the document must name your parents; the short English birth certificate without parental details is not enough, so order the full GRO certificate, the General Register Office full certificate with parentage, well in advance. The six-month clock runs from the day you lodge the file, not the wedding day, and the lodging itself triggers the banns, so time the order to the appointment, not to the ceremony. If the document is in English, which it will be, it must be translated by a traducteur assermenté, a sworn translator registered with a French court of appeal. Depending on the country of origin, the guidance adds, further formalities may be needed: an apostille or legalisation. Have the certificate regularised in the United Kingdom before you bring it, and keep a spare certified copy, because the mairie keeps the file.
Then comes the specifically British difficulty: the two certificates the mairie asks every foreigner for. The same official page states: the town hall may ask you for documents specific to your nationality Those documents are the certificat de coutume, the certificate of custom, and the certificat de célibat, the certificate of celibacy, also called certificate of marital capacity. The guidance explains: the certificate of custom is usually provided by your embassy or consulate It sets out the foreign marriage rules and proves status, while the celibacy certificate “proves you’re not already married” and is requested where the home country cannot supply up-to-date documents. Here is the trap: the United Kingdom issues neither. There is no British equivalent of the certificat de coutume, and British missions in France do not deliver celibacy certificates. A couple that waits for a document that does not exist loses months.
The working substitute is published by the British government itself. The official guidance states: a British national getting married or registering a PACS in France does not need a certificate of no impediment (CNI) from the UK government It continues: British nationals cannot obtain those certificates, but they can submit a self-declaration form stating they are free to marry or register a PACS, together with an explanatory note That is the self-declaration procedure for France on gov.uk: print the form and the explanatory note, complete the form without signing it, ask the mairie whether the signature must be legalised, and if so have a local notaire, the French public officer for authenticated deeds, certify it. If both partners are British, both complete the exercise. Where the passport name differs from the birth certificate name, which is common after a deed poll change or after a first marriage, the guidance tells you to bring the explanatory note on British names with evidence of the change. Present the file at the appointment and sign there if legalisation was not required. In short: the affidavit-style self-declaration plus the explanatory note is the recognised stand-in, and mairies in areas with British residents know it, but confirm at the first appointment because a registrar who has never seen one may still ask questions.
The official page also provides the fallback where even that route stalls: where the country of origin does not issue a certificate of custom, you must provide a certificate from its competent authorities saying so And further: where even that is impossible, you must provide a sworn statement that you are of full age, single and legally capable That last document is the attestation sur l’honneur, a signed sworn statement, sometimes completed by a statement from a solicitor explaining the applicable English rules. It is weaker than the gov.uk pack, so use the gov.uk route first and keep the fallback in reserve if a registrar proves difficult.
Two more file points before the banns. Witnesses, the témoins: the Code requires the ceremony to take place “en présence d’au moins deux témoins, ou de quatre au plus”, as article 75 of the Civil Code provides, so line up two to four adults with valid identity documents; they need not be French and need not be relatives. And the marriage contract, the contrat de mariage: “Toutes les conventions matrimoniales seront rédigées par acte devant notaire”, provides article 1394 of the Civil Code. If you want anything other than the default property regime, the contract must be signed before a notaire before the wedding, and the notaire issues the certificate you hand to the registrar. Decide this early, because it shapes everything in part II.
Once the file is lodged and complete, the banns run their course. Article 64 of the Civil Code states: “L’affiche prévue à l’article précédent restera apposée à la porte de la maison commune pendant dix jours.” And: “Le mariage ne pourra être célébré avant le dixième jour depuis et non compris celui de la publication.” Ten full days on the town-hall door, and no ceremony before the eleventh day. The banns are not folklore: during that window, anyone entitled to do so may file an opposition, and the registrar or the prosecutor may start asking questions.
B. The interview, the prosecutor and the opposition: how a refusal is built and how you defeat it
The stage most British couples underestimate is the audition, the interview. Article 63 makes a joint hearing of both future spouses the default step of the procedure, dispensed with only where impossible or where the file itself shows it is unnecessary in light of articles 146 and 180. Where the registrar, from your papers, the joint hearing or substantiated outside information, has reason to fear the marriage could be annulled for lack of consent or for a defect of consent, the registrar must hear each of you separately. For a Franco-British couple this is routine risk management by the mairie, not an accusation: different languages, a short relationship, a partner in an irregular residence situation, or documents the registrar has never seen can each trigger the separate interview. Prepare for it the way you prepared the file: know your own story coherently, bring proof of your shared life, and answer consistently, because the report of that hearing follows the file if it goes further.
Where serious indications remain that the planned marriage could be annulled under article 146 or article 180, the registrar has no choice: “l’officier de l’état civil saisit sans délai le procureur de la République”, as article 175-2 of the Civil Code provides, adding “Il en informe les intéressés.” The procureur de la République, the state prosecutor attached to the local court, then holds three options, and the statute gives a strict timetable: “Le procureur de la République est tenu, dans les quinze jours de sa saisine, soit de laisser procéder au mariage, soit de faire opposition à celui-ci, soit de décider qu’il sera sursis à sa célébration, dans l’attente des résultats de l’enquête à laquelle il fait procéder.” Fifteen days to allow, oppose or suspend for investigation. And: “La durée du sursis décidé par le procureur de la République ne peut excéder un mois renouvelable une fois par décision spécialement motivée.” One month, renewable once with specific reasons. A suspension is therefore not a refusal: it is a capped investigation window, and at its expiry the prosecutor must decide.
The investigation looks for the two classic defects. The first is the absence of matrimonial intent, the mariage blanc or sham marriage, caught by article 146: no consent, no marriage. The second covers constrained or mistaken consent under article 180 of the Civil Code, including pressure, even moral pressure from family: “L’exercice d’une contrainte sur les époux ou l’un d’eux, y compris par crainte révérencielle envers un ascendant, constitue un cas de nullité du mariage.” For British readers: a marriage entered only to secure a residence permit is voidable, and a marriage imposed on one partner is voidable at the suit of that partner or the prosecutor. Genuine couples sometimes fear this control; the answer is evidence of real shared life, not indignation.
The leading recent illustration comes from the Cour de cassation itself. On 25 March 2026 the First Civil Chamber ruled in pourvoi no. 24-12.863 on a Franco-Moroccan case that sets the method for every mixed marriage file. The couple had sought the certificate of capacity for marriage, the certificat de capacité à mariage, from the French consulate; the prosecutor opposed the marriage in October 2019; the couple sought the lifting of the opposition in 2021. The Court first recalled the consular route in article 171-4: “Lorsque des indices sérieux laissent présumer que le mariage envisagé encourt la nullité au titre des articles 144, 146, 146-1, 147, 161, 162, 163, 180 ou 191, l’autorité diplomatique ou consulaire saisit sans délai le procureur de la République compétent et en informe les intéressés.” Then it approved investigation before opposition: “Le ministère public agissant en la matière pour la défense de l’ordre public”, it was entitled “de recueillir toute information complémentaire avant de prendre sa décision”, including hearing the France-based partner through investigators. Three lessons for a British couple. First, the prosecutor is allowed to investigate before opposing; an opposition built on a police or consular report is not automatically irregular. Second, the review of the refusal happens before the tribunal judiciaire, the unified civil court, which reassesses the facts. Third, and most protective: the appeal court had relied on finances and immigration history, and the Cour de cassation accepted the outcome only because the judges had decided “sans se fonder exclusivement sur la situation financière et le passé migratoire” of the foreign partner. An uneven bank balance or a complicated immigration past cannot by themselves prove a sham; the court must find the absence of a genuine matrimonial project on the whole evidence.
Oppositions are not filed by prosecutors alone. Family members and even the spouse of a still-married partner can oppose on legal grounds such as minority, existing marriage or prohibited kinship, and the official guidance describes the machinery: “The opposition prevents the celebration of marriage.” It continues: for the marriage to proceed, the opposition must be lifted, a step known as release of the opposition The procedure is formal: written opposition stating identity, relationship, grounds and the legal text relied on, served by a commissaire de justice, the enforcement officer, on both the couple and the registrar. The release is sought before the tribunal judiciaire of the marriage commune or of the opponent’s domicile, and “The use of a lawyer is mandatory.” Where the opposition was abusive, the guidance notes, where the court rejects the opposition, the opponent, other than an ascendant, may be ordered to pay damages and interest For a British partner served with an opposition from a hostile relative, the reflex is therefore: instruct counsel immediately, gather the file and the evidence of genuine consent, and apply for the mainlevée, the judicial lifting, rather than negotiating informally while the wedding date slips.
A final warning for this stage. If the prosecutor or the registrar suspects a sham, every inconsistency between your statements, your documents and your publicly visible life will be used. Conversely, documents proving cohabitation, joint finances, travel together, knowledge of each other’s families and consistent accounts of the relationship carry real weight. The courts judge intent, and intent is proved by the paper trail of ordinary life.
II. After the Ceremony: Property, Proof and Recognition Across the Channel
A. Your property from day one: the default community and the contract that replaces it
Many British couples assume that, married in France without paperwork, each keeps their own. The opposite is true. Article 1400 of the Civil Code provides: “La communauté, qui s’établit à défaut de contrat ou par la simple déclaration qu’on se marie sous le régime de la communauté, est soumise aux règles expliquées dans les trois sections qui suivent.” In plain terms, silence means the communauté réduite aux acquêts, the community of acquisitions: what each of you owned or was owed before the wedding, and what you receive by gift or inheritance during it, stays personal, while earnings, savings built from earnings and assets bought during the marriage fall into the common pot, shared on divorce or death subject to the detailed rules. The salary paid into the joint account in Lyon, the flat bought during the marriage, the business created after the wedding: community, unless a contract says otherwise. For a British reader used to the English starting point of separate property, this is the single most consequential line of the whole process.
The way out must be built before the ceremony. Article 1394 of the Civil Code states: “Toutes les conventions matrimoniales seront rédigées par acte devant notaire”. Separation of property, the séparation de biens, which keeps everything separate, or a tailored community with clauses protecting the French house or the British partner’s business, all pass through the notaire before the wedding, and the certificate is handed to the registrar. The same article adds a warning that follows you into every later transaction: “Si l’acte de mariage mentionne qu’il n’a pas été fait de contrat, les époux seront, à l’égard des tiers, réputés mariés sous le régime de droit commun”. Banks, buyers and the tax administration will treat you as community spouses on the strength of the marriage certificate alone. Couples with a house on one side of the Channel, children from a first relationship or a business should therefore see the notaire months before the file is lodged, not weeks. The guide to matrimonial regimes for couples married in England and living in France details how the default regime interacts with the house, divorce and death, and how a regime can be changed during the marriage where the law allows. Where the marriage later breaks down, the forum, the applicable law and the enforcement of the English or French divorce across the Channel are covered in the guide to Franco-British divorce after Brexit.
B. Already married in England: how France recognises your English wedding
Plenty of British readers come at the question from the other side: married in Manchester, Leeds or Gretna Green years ago, now settling in France, is the marriage valid here. The answer starts with article 171-1 of the Civil Code: “Le mariage contracté en pays étranger entre Français, ou entre un Français et un étranger, est valable s’il a été célébré dans les formes usitées dans le pays de célébration et pourvu que le ou les Français n’aient point contrevenu aux dispositions contenues au chapitre Ier du présent titre.” Two cumulative tests: the local forms were respected, and the French spouse complied with French substantive conditions. The mirror rule for form is article 202-2 of the Civil Code: “Le mariage est valablement célébré s’il l’a été conformément aux formalités prévues par la loi de l’Etat sur le territoire duquel la célébration a eu lieu.” An English civil or Anglican ceremony valid under English law is therefore formally valid in French eyes, and the gov.uk guidance confirms the symmetry from the British side: the United Kingdom will recognise your marriage or PACS where you followed the correct French process and the union would be allowed under UK law. A French mairie wedding valid in France and allowed under English law is recognised in England, with no second ceremony needed.
Recognition then needs paperwork. English marriage certificates, like all foreign civil-status records, benefit from a strong presumption. Article 47 of the Civil Code provides: “Tout acte de l’état civil des Français et des étrangers fait en pays étranger et rédigé dans les formes usitées dans ce pays fait foi, sauf si d’autres actes ou pièces détenus, des données extérieures ou des éléments tirés de l’acte lui-même établissent, le cas échéant après toutes vérifications utiles, que cet acte est irrégulier, falsifié ou que les faits qui y sont déclarés ne correspondent pas à la réalité.” An English certificate in due form is proof unless shown to be irregular, forged or false. The Cour de cassation gave this presumption full force in a London case: in pourvoi no. 18-15.368, decided 18 March 2020, the French consulate in London had refused to transcribe a Kensington and Chelsea birth record, and the Court ordered transcription, holding: “Il se déduit de ces textes qu’en présence d’une action aux fins de transcription de l’acte de naissance étranger d’un enfant, qui n’est pas une action en reconnaissance ou en établissement de la filiation, ni la circonstance que l’enfant soit né d’une assistance médicale à la procréation ni celle que cet acte désigne la mère ayant accouché et une autre femme en qualité de mère ou de parent ne constituent un obstacle à sa transcription sur les registres français de l’état civil, lorsque l’acte est probant au sens de l’article 47 du code civil.” The case concerned a birth, but the method is the one consulates and courts apply to English marriage certificates too: regularity under English law plus probative value under article 47 compels transcription, and a refusal must be grounded in a demonstrated irregularity, not in the certificate looking unfamiliar. In practice, have the English marriage certificate transcribed onto the consular registers through the French consulate in London, obtain the livret de famille, the official family booklet that proves the union to every French administration, and keep apostilled copies for the notaire, the bank and the tax office.
One substantive trap deserves emphasis for couples who married outside France where one partner is French. In pourvoi no. 19-11.573, also decided 18 March 2020, the Court recalled that substantive conditions follow each spouse’s personal law, then stated the French presence rule: “le mariage d’un Français, même contracté à l’étranger, requiert sa présence”, adding that the rule “requiert la présence des seuls français lors de leur mariage contracté à l’étranger”. A proxy or absence-based ceremony abroad may satisfy the foreign law for the foreign spouse yet fail the French test for the French spouse, exposing the union to annulment proceedings in France. British couples with a French partner should therefore marry in person, together, wherever the ceremony takes place, and keep the proof: photographs, travel records and the officiant’s certificate. Where the wedding is then followed by a residence application, the companion guide to the mairie file, refusal and the spouse residence card covers the titre de séjour steps.
Conclusion
A British marriage in France stands on three legs: a complete file lodged early at the right mairie, with the full birth certificate, the gov.uk self-declaration pack in place of the unobtainable French certificates, and witnesses and property choices settled in advance; a calm passage through the banns and any interview, knowing the prosecutor’s fifteen-day window, the capped suspension and the judicial lifting of any opposition; and after the ceremony, a property regime chosen rather than suffered, plus transcribed proof that both countries recognise. Start three to six months before the intended date, confirm the documentary expectations of your specific mairie at the first visit, and keep certified copies of everything the file contained. Registrar practices, consular response times and translation delays vary, and only the file as lodged, the statutes and the decisions quoted above decide the outcome.