Since Brexit, a British citizen who wants to marry in France is no longer an EU citizen exercising free movement. That change does not alter the French law of marriage itself: the same Civil Code applies to everyone. What it changes is everything around the wedding — the papers a British fiancé must produce, the way the registrar (the officier de l’état civil, the mayor or deputy who celebrates civil marriages) checks foreign documents, the residence position of each partner the day after the ceremony, and the scrutiny a Franco-British file can attract when the public prosecutor suspects a sham. This guide explains, for British readers in plain English, how a civil marriage at the mairie (the town hall) actually works after Brexit, when the PACS (pacte civil de solidarité, the French civil partnership) is a better fit, and what to do if the authorities delay, oppose or attack your marriage. Every French term is explained at first use, and every decisive legal point is tied to the exact article or court decision that proves it.
I. How do British citizens marry at the French mairie after Brexit?
A. What papers does a British fiancé need for the mairie file?
France only recognises civil marriage. A religious ceremony, however beautiful, has no legal effect on its own, and it may only take place after the civil ceremony at the mairie. The civil marriage must be celebrated publicly by the registrar of the commune (municipality) where one of the future spouses, or one of their parents, has their domicile (legal home) or residence. That local link is the first checkpoint: a British couple with no address and no parent’s address in the commune cannot simply pick a picturesque village and demand a wedding date. Where neither partner lives in France, the realistic routes are marrying in the commune where one partner’s parent lives, establishing genuine residence first, or marrying in the United Kingdom and then having that marriage recognised in France, a route examined below.
The substantive conditions are few but strict. Each person must be at least eighteen: Article 144 of the Civil Code states: “Le mariage ne peut être contracté avant dix-huit ans révolus.” Each person must consent, and consent is the absolute foundation of French marriage law: Article 146 of the Civil Code states: “Il n’y a pas de mariage, lorsqu’il n’y a point de consentement.” Nobody already married may remarry before the first marriage is dissolved: Article 147 of the Civil Code states: “On ne peut contracter un second mariage avant la dissolution du premier.” A marriage contracted without the free consent of both spouses, or of one of them, may be attacked, and constraint imposed on the spouses, including through fear of reverential respect towards an ascendant, is treated as destroying freedom of consent under article 180 of the Civil Code. For British readers used to English law, the striking point is that French law gives the state prosecutor (the procureur de la République, the magistrate who defends the public interest) an active policing role over these conditions before and after the wedding, as the case law below shows.
For mixed-nationality couples, French private international law adds a conflicts rule that every British fiancé should understand. Article 202-1 of the Civil Code provides that the qualities and conditions required to marry are governed, for each future spouse, by that spouse’s personal law (essentially their national law), but that whatever the applicable personal law, the marriage requires the consent of the spouses within the meaning of article 146 and the first paragraph of article 180. The Cour de cassation (France’s supreme court for civil matters) gave this provision its full practical meaning in a published decision of 18 May 2022, pourvoi No 21-11.106, holding: “Aux termes de l’article 202-1 du code civil, les qualités et conditions requises pour pouvoir contracter mariage sont régies, pour chacun des époux, par sa loi personnelle. Quelle que soit la loi personnelle applicable, le mariage requiert le consentement des époux, au sens de l’article 146 et du premier alinéa de l’article 180.” The Court then recalled that “Il n’y a pas de mariage lorsqu’il n’y a point de consentement.” and concluded: “Il en résulte que l’action était en réalité fondée sur l’article 146 du code civil, de sorte que la loi française était applicable” (Cass. 1st civ., 18 May 2022, No 21-11.106, published in the Bulletin). In plain terms: English law may govern whether you personally have capacity to marry, but the French definition of genuine consent always applies to a wedding in France, and an action arguing that one spouse never truly intended marriage is judged under French law. A British spouse who discovers the other married only for a residence permit therefore sues in nullity on French grounds, not English ones.
The documentary file (the dossier de mariage) is where British couples feel Brexit most concretely. Expect the mairie to ask for: a valid British passport; a full birth certificate, generally recent, with an apostille (the Hague Convention legalisation stamp, obtained in the UK from the Foreign, Commonwealth and Development Office) and a certified translation by a traducteur assermenté (a translator sworn before a French court of appeal); proof of address and residence in the commune; the identity documents and details of at least two witnesses (témoins); and, where relevant, the decree absolute proving a divorce is final, or the death certificate of a former spouse. Two specifically French documents deserve attention. The certificat de coutume (certificate of custom) is a statement of what English law says about your capacity to marry, usually drawn up by an English solicitor and then legalised and translated. The certificat de célibat (certificate of single status) or its affidavit equivalent proves you are free to marry. The British Embassy in Paris no longer issues certificates of no impediment the way some mairies remember from before, so since Brexit many couples supply a sworn statement (attestation sur l’honneur, a signed declaration made on one’s honour) or a solicitor’s statutory declaration instead. Practice varies from one mairie to another, which is why the single most valuable step is to collect the commune’s own printed list of required documents months in advance and confirm in writing that your British-format papers will be accepted. Arriving with a file the registrar has never seen, weeks before the chosen date, is the classic avoidable cause of postponement.
Once the file is lodged, the registrar publishes the bans (the publication des bans, the public notice of the intended marriage). Article 63 of the Civil Code requires publication by poster on the door of the town hall, stating the names, occupations, domiciles and residences of the future spouses and the place of celebration, and the wedding cannot be celebrated until ten days after that publication. The same article allows the registrar, where serious indications suggest the marriage may be annulled on listed grounds, to ask the public prosecutor to authorise the hearing (audition) of the future spouses together or separately before publication. For a British file with unfamiliar documents, an age gap, a very short relationship or no common language, an audition is not an accusation; it is the standard verification channel, and preparing for it calmly, with the story of the relationship told consistently and supported by documents, is far more effective than protesting. The English-language official guidance on getting married in France is summarised on service-public.fr, Marriage in France, and the UK government’s checklist of documents for weddings abroad sits at gov.uk, marriages and civil partnerships abroad.
B. Can you marry in France if one partner still lives in the United Kingdom?
Yes, provided the commune link exists through the other partner or a parent, because French law requires only that one of the future spouses, or one of their parents, have domicile or residence in the commune of celebration, under the rule recalled above for article 165 of the Civil Code. A British woman living in London can therefore marry her British fiancé at the mairie of the Dordogne village where he has genuinely lived for months, or where her mother is domiciled. What she cannot do is land in France on a short visit and marry in a commune to which neither has any tie. For the partner travelling from the UK, the wedding trip itself is a normal short stay; the marriage ceremony does not require either spouse to hold a French residence permit on the wedding day. Couples should nevertheless keep evidence of lawful entry and of the genuine link to the commune, because those are exactly the points a suspicious file review will probe.
The alternative many couples choose is to marry in the United Kingdom and live with that marriage in France. Article 171-1 of the Civil Code provides that a marriage contracted abroad between French nationals, or between a French and a foreign national, is valid if celebrated in the forms used in the country of celebration and provided the French party or parties complied with the substantive French conditions. For two British spouses the same logic applies through the general conflicts method: a marriage validly celebrated under English, Scottish or Northern Irish forms is in principle recognised in France, subject to French public policy (ordre public, the core values French law refuses to compromise, such as monogamy and genuine consent). In practice the couple then seeks transcription (the copying of the foreign marriage details onto the French civil registers, which produces French birth-and-marriage margin notes and makes later proof effortless) where a French connection exists, or simply relies on the English marriage certificate, duly legalised with an apostille and translated, for dealings with the préfecture (the state authority in each département that issues residence permits), the tax office, health cover and employers. A Gretna Green or registry-office wedding followed by careful paperwork is therefore a perfectly respectable strategy, particularly where the French commune link is weak.
Marriages celebrated abroad are, however, policed at the transcription stage. Article 171-4 of the Civil Code provides: “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.” The prosecutor may then, within two months of referral, oppose the celebration or transcription by reasoned decision, and the future spouses may seek lifting of that opposition (mainlevée, the court order releasing the block) at any time before the judicial court under articles 177 and 178. The scope of the prosecutor’s preparatory powers was confirmed in the strongest terms by the Cour de cassation on 25 March 2026, pourvoi No 24-12.863, published in the Bulletin: “Aux termes de l’article 146 du code civil, il n’y a pas de mariage lorsqu’il n’y a point de consentement.” the Court recalled, before holding that the public prosecutor, acting in defence of public policy after a consulate had flagged indications of a possibly void marriage on article 146 grounds, was entitled to gather any additional information before deciding, so that the validity of the hearing of the partner domiciled in France, entrusted to investigators under the prosecutor’s authority, could not be challenged (Cass. 1st civ., 25 March 2026, No 24-12.863, published in the Bulletin). British couples marrying abroad with a later French transcription in view should read this twice: a consulate that doubts the file will refer it, the prosecutor will investigate, and courts will uphold that investigation.
The day after the wedding, residence is where Brexit bites hardest, and marriage does not magically fix it. A British citizen married to a French citizen may be issued a one-year temporary residence card marked vie privée et familiale (private and family life) where the statutory conditions are met, including that “La communauté de vie n’a pas cessé depuis le mariage” (the shared life has not ended since the marriage), under article L423-1 of the Code on the Entry and Residence of Foreigners (CESEDA). The préfecture will check the reality of cohabitation, the French nationality of the spouse and the absence of polygamy or fraud, and a sham finding destroys the application and can trigger removal steps. Where both spouses are British, marriage alone grants neither of them French residence: each must hold their own basis for stay, whether a Withdrawal Agreement card for those settled before 2021, a work-based card, a visitor card with sufficient resources, or another CESEDA route. Couples should therefore plan the wedding and the residence applications as two parallel tracks, keep every proof of life together from the start — joint lease, joint tax return, joint bank account, travel together — and never assume the livret de famille (the official French family booklet issued at marriage) substitutes for a titre de séjour (residence permit).
II. Should a British couple choose the PACS instead, and what if the mairie says no?
A. Is the PACS a faster and safer route for a British couple living in France?
The PACS is a contract between two adults, of different sexes or the same sex, organising their shared life: Article 515-1 of the Civil Code states: “Un pacte civil de solidarité est un contrat conclu par deux personnes physiques majeures, de sexe différent ou de même sexe, pour organiser leur vie commune.” Since 2017 it is registered at the mairie of the commune of shared residence (or before a notaire, the French public officer who authenticates family and property deeds, for a tailored contract), which makes it administratively lighter than a wedding: a joint declaration, identity and residence documents, birth certificates, and certificates that neither partner is already married or already in a PACS. The bars are explicit and narrow: under pain of nullity, no PACS is possible between close relatives, between two people where at least one is still married, or between more than two people in overlapping PACS, under article 515-2 of the Civil Code. Partners declare the PACS jointly before the registrar of the commune where they fix their common residence, or, in cases of serious impediment, through the mechanisms the article organises, under article 515-3 of the Civil Code. It ends by death, by the marriage of the partners or one of them, or by unilateral or joint dissolution declared to the registrar or the notaire who received it, under article 515-7 of the Civil Code. The English-language official presentation is at service-public.fr, Civil Solidarity Pact.
For a British couple newly settled in France, the PACS has genuine attractions. It creates a recognised couple for tax purposes (joint income tax return from the year of registration), for social security affiliation as an ayant droit (a person covered through the partner’s rights), for tenancy rights (the partner succeeds to the lease and both are jointly liable once the landlord is notified), and for employment benefits that depend on family status. Registration is quick, dissolution is unilateral without a judge, and the default property regime separates what each owned before and shares only what is bought together afterwards unless the partners opt otherwise — closer to English expectations than the French default matrimonial community. Where the couple’s priority is practical recognition within months of arrival, while keeping an English will structure and English-law expectations for pre-owned assets, the PACS is often the rational first step.
Its limits must be stated bluntly, because British partners routinely overestimate it. The PACS is not a marriage-lite with identical effects. It gives no inheritance rights between partners: a surviving PACS partner inherits nothing without a will (testament), whereas a surviving spouse is a protected heir. It gives no widow’s pension (pension de réversion, the survivor’s share of a deceased spouse’s retirement pension) in the general state scheme. It does not confer the married person’s position in nationality applications, and for residence purposes a PACS with a French citizen weighs less than marriage: it supports a private-and-family-life application but without the closeness of the L423-1 marriage route, and a PACS between two British citizens confers no residence right at all. Dissolution is easy, which is precisely why it comforts the cautious — and precisely why it proves less about commitment when the préfecture or a consulate assesses the seriousness of a relationship. Couples who want the full protection of the surviving spouse, the strongest residence position for a foreign spouse, and automatic filiation presumptions for children to be born should marry; couples who want fast administrative recognition with an easy exit, while they test life in France, should consider the PACS first and marry later, knowing that marriage automatically dissolves the PACS.
Tax and property deserve one clear paragraph because they drive many British decisions. Marriage places the couple by default under the communauté réduite aux acquêts (community of property limited to acquisitions, the statutory regime pooling what is earned or bought during the marriage while keeping pre-marriage assets and gifts separate), unless a contrat de mariage (marriage contract signed before a notaire before the wedding) opts for séparation de biens (separation of property) or another regime. The PACS default is separation-like unless the partners choose indivision (joint undivided ownership). Neither choice is neutral for a British family that already owns a UK property portfolio, and neither is reversible without cost once years of earnings have flowed through the wrong regime. Before registering anything, a British couple with assets on both sides of the Channel should take one session with a notaire on regimes and wills alongside the immigration advice: the cheapest hour of the whole process is the one that prevents a regime that contradicts the English wills.
B. How do you challenge a refusal, an opposition or a nullity threat?
Refusals come in three distinct legal shapes, and the remedy depends on identifying the right one. First, the registrar may simply refuse to publish the bans or to celebrate the marriage, for example for an incomplete file or a missing commune link. The answer here is administrative before it is judicial: complete the file with a written checklist from the mairie, obtain a written statement of what is missing and why, and escalate through a formal letter (courrier recommande avec accuse de reception, registered letter with proof of delivery) asking for a reasoned written decision. An unreasoned oral “no” cannot be challenged; a reasoned written refusal can be taken to the tribunal judiciaire (the ordinary civil court) and, where the refusal looks discriminatory or legally baseless, to the Défenseur des droits (the independent rights ombudsman). Never shout at the guichet (the counter); build the paper trail that a judge can read.
Second, the prosecutor may oppose the marriage. Where serious indications suggest the planned marriage could be annulled, the registrar or the consular authority refers the file, and the prosecutor may oppose celebration in France under article 175-2 of the Civil Code, or oppose transcription of a marriage celebrated abroad under the article 171-4 mechanism quoted above. Opposition is notified by reasoned decision, and, as the 25 March 2026 ruling confirms, preparatory hearings and police enquiries ordered under the prosecutor’s authority are lawful and will survive appeal where a consulate flagged genuine warning signs. The remedy is the demande en mainlevée: the future spouses apply to the tribunal judiciaire at any time for the opposition to be lifted, and the court hears both sides and decides whether the suspicion is substantiated. Success turns on evidence, not indignation: proof of cohabitation, photographs and travel together, daily correspondence, testimony from both families, a common language or genuine efforts to learn it, consistent accounts of how the couple met, and a coherent plan for life together in an identified home. Gaps — no shared address, no knowledge of the other family, contradictory statements at audition, a recent meeting followed by unusual haste, money changing hands — must be explained honestly or they will decide the case. In Paris and the inner suburbs, where files are heavy, instructing counsel early matters: the Barreau de Paris (the Paris Bar) lists family and foreigners’-rights practitioners accustomed to the parquet de Paris (the Paris prosecutor’s office) and to the relevant chambers of the tribunal judiciaire de Paris, and early advice shapes the audition instead of repairing it.
Third, after celebration, the prosecutor or an interested party may sue for nullity (annulment with retroactive effect) for breach of articles 144, 146, 147, 180 or 191, and a spouse who discovers the other’s lack of matrimonial intent sues on article 146 under French law, exactly as the 18 May 2022 decision directs. Nullity for defect of consent is an absolute nullity (nullité absolue, a defect so fundamental that a wider circle of claimants, including the prosecutor, may invoke it), with a long limitation period, and its effects are brutal: the marriage is deemed never to have existed, with knock-on consequences for the residence card obtained through it, for the PACS-like advantages claimed, and for any nationality application. Defence means proving genuine consent through the same lived-life evidence as above, plus attacking the legal characterisation: error on non-essential qualities is not absence of consent, and the line between a naive marriage and a simulated one is drawn by the trial judges whose factual assessment the Cour de cassation reviews only for legal error. Where the allegation is constraint or violence, article 180 opens the action to the constrained spouse and the prosecutor alike, and protective and criminal tracks run alongside the civil nullity.
Three practical rules raise the odds in every scenario. Keep one chronological evidence binder from the first month: lease and bills at the shared address in both names, joint tax notices, joint account statements, registered-post receipts, photographs with dates, and every letter from the mairie, consulate, préfecture or prosecutor with its envelope. Answer every summons to audition and every request for documents within the stated time, in writing, keeping copies; silence is read as confirmation of suspicion. And freeze the calendar risk: do not book non-refundable venues, give notice on a UK tenancy, or resign a job on the assumption that a flagged file will clear in weeks, because opposition and mainlevée proceedings run in months and transcription controls longer still. Couples in Paris and Île-de-France should add one local reflex: identify early which mairie d’arrondissement (each Paris district has its own town hall) or suburban mairie holds the file, which prosecutor’s office supervises it, and which tribunal judiciaire would hear the mainlevée, so that every letter goes to the right desk the first time. A file that is complete, consistent, polite and procedurally exact wins far more often than a file that is merely sincere.
Conclusion
Marrying in France as a British citizen after Brexit is neither forbidden nor formidably hard; it is procedurally demanding in a very French way. The commune link decides where you may marry, the documentary file decides when, genuine consent decides everything, and residence must be planned separately from the wedding itself. Couples with a solid French base and a long horizon should marry at the mairie with a complete, translated, legalised file and a clear-eyed audition if one is requested. Couples who married in Britain should secure the apostille, the sworn translation and, where available, transcription, rather than assuming an English certificate speaks for itself. Couples who need fast recognition without the full commitment of marriage should weigh the PACS for what it is — quick, flexible and administratively useful, but no substitute for a spouse’s inheritance, pension and residence position. And any couple facing opposition or nullity proceedings should stop improvising and litigate the evidence: the two published Cour de cassation rulings explained above show that French courts apply French consent law to everyone, allow the prosecutor wide preparatory powers, and decide on the concrete proofs of shared life. Prepared early, a Franco-British marriage file is a celebration with paperwork attached; prepared late, the same file becomes a court case with a wedding attached. Choose the first version.
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