You live in France on a British passport, your partner lives here too or is joining you, and you want to get married at the local mairie (town hall). Since Brexit you are a third-country national in French law, and the paperwork for the wedding is no longer the light-touch routine it used to be. The single biggest trap is the document the town hall clerk will ask for first: a certificate proving that your own country sees no obstacle to the marriage. Britain does not issue one for France, and has not done since well before Brexit, yet many mairie checklists still mention a certificat de coutume (certificate of custom, a document describing the marriage law of your home country) or a certificat de célibat (certificate of single status) as if your embassy could hand one over. What replaces them is a sworn self-declaration published by the British authorities in May 2024, and this article explains exactly how that declaration fits into the French file, where and when you may marry, what happens at the pre-wedding interview, and what to do if the registrar or the public prosecutor blocks the ceremony — or if somebody attacks the marriage afterwards.

French marriage law is formal and protective: the civil ceremony at the mairie is the only act that makes you married, the publication des bans (the public notice of the intended wedding, posted on the town-hall door) must hang for ten days, and the officier de l’état civil (the registrar, usually the mayor or a deputy) must interview you both before the day. Those steps exist to catch forced marriages and sham marriages, and since a Franco-British wedding now involves a non-EU nationality, registrars apply the interview and verification rules with visible zeal. The good news is that every refusal, postponement and opposition has a statutory deadline and a judge to appeal to, often within ten days. The bad news is that missing a deadline or filing the wrong paper can delay the wedding by months. This guide walks through the whole path in two stages: first, building a file the registrar accepts; second, defeating a blockage before the ceremony or an attack on the marriage after it.

I. Getting the mairie to say yes: where, when and with which papers for a British wedding in France

A. Where and when a British couple can marry: the commune rule, the ten-day notice and the age condition

Only a French civil ceremony makes you married in France. A church blessing, a humanist celebration or a ceremony conducted abroad under another law does not replace it, and the French ceremony must take place in a specific town hall: Article 74 of the Civil Code provides, in the original French, that « 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. » In plain terms, you marry in the commune (municipality) where one of you, or one of your parents, has lived continuously for at least one month on the date the bans are published. In Paris that means the mairie of the arrondissement of domicile, and you cannot simply pick a picturesque village where neither of you lives: a celebration in the wrong commune can be annulled. If you only arrived in France a few weeks ago, count the month carefully before filing, and keep proof of continuous residence such as utility bills, a lease or taxe d’habitation notices in your name.

Before the celebration, the registrar must publish the bans: Article 63 of the Civil Code states that « 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 service-public.fr English-language guide to marriage in France explains the practical side: the notice is displayed for ten days at the door of the town hall of the wedding and of the town hall of each future spouse’s home, and the wedding cannot go ahead until that display period has run. Build that fortnight into any venue booking, honeymoon flight or family travel plan, because the registrar will not shorten it on request. The only shortcut belongs to the public prosecutor: Article 169 of the Civil Code provides that « Le procureur de la République dans l’arrondissement duquel sera célébré le mariage peut dispenser, pour des causes graves, de la publication et de tout délai ou de l’affichage de la publication seulement. » A dispense for serious cause — typically a medical emergency or an imminent posting abroad — is exceptional, must be requested with evidence, and is granted by the procureur de la République (the state prosecutor for the court district), never by the mayor alone.

Two threshold conditions apply to everyone, Britons included. First, age: Article 144 of the Civil Code states that « Le mariage ne peut être contracté avant dix-huit ans révolus. » There is no longer any routine parental-consent route below eighteen of the kind some readers remember from older law, so both future spouses must be eighteen on the wedding day. Second, freedom to marry: neither of you may already be married or bound by a registered partnership that the registrar treats as an impediment, and close kinship between you is a bar. If either of you was previously married, bring the final divorce decree or the former spouse’s death certificate, translated and legalised as described below, because the registrar checks the chain of civil status before publishing anything.

The practical lesson of this first stage is timing. Between assembling foreign documents, obtaining sworn translations, waiting for the ten-day display and absorbing a possible interview (see below), a realistic Franco-British file takes six to ten weeks from first visit to the mairie to the ceremony. Start the file the moment the commune of celebration is settled, and never pay a non-refundable venue deposit dated inside the display period.

B. The documents file: birth certificate, apostille, sworn translation and the self-declaration that replaces the British CNI

The file you hand to the registrar is listed in Article 63 itself: for each future spouse, the civil-status documents required by Articles 70 or 71, proof of identity issued by a public authority, and the full names, dates and places of birth, occupations and addresses of your witnesses. For a British national, the civil-status core is normally a full birth certificate. Article 47 of the Civil Code gives foreign civil-status records their evidential value: « 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. » A genuine British birth certificate therefore counts as proof — but the registrar may verify it, and verification is where British files often stall. Order a fresh full certificate rather than relying on a short version or a decades-old copy, because the short certificate omits parentage and the registrar needs parentage to check kinship impediments and to draw up the French acte de mariage (marriage certificate) correctly.

Every British civil-status document must then be made usable in France in two steps: legalisation and translation. The service-public.fr guide states the rule plainly for foreign papers — they must carry an apostille (the international authentication stamp) or be legalised, with only narrow exemptions such as Switzerland — and the legalisation page it points to governs the procedure. In practice, British birth certificates and divorce decrees presented in France carry an apostille obtained in the United Kingdom before you file, and the apostille itself must be recent enough to satisfy the particular mairie, which is why you should ask the registrar in writing which date limits the office applies before paying for anything. Then comes translation: every English-language document must be translated into French by a traducteur assermenté (a translator sworn before a French court of appeal), with the translator’s stamp and signature on each page. A translation done by a bilingual friend, a British translation agency without French sworn status, or an online tool will be rejected, and rejections at this stage are the single most common cause of postponed Franco-British weddings. Budget for the translator early and keep the originals, the apostilles and the translations stapled as sets, because the registrar keeps copies and you will need matching sets for later steps such as the livret de famille (family record book).

The specifically British difficulty is the proof that you are free to marry. The service-public.fr guide describes the standard expectation: the certificate of custom is normally supplied by the embassy or consulate and, for the single-status proof, it is normally supplied by the embassy or consulate and serves as proof that the holder is not already married The problem is that the British authorities do not provide these certificates for France. The Foreign, Commonwealth and Development Office page about the self declaration form for marriage or civil partnership (PACS) in France, published on 3 May 2024, resolves the contradiction in terms every British couple should memorise: a British national getting married or registering a PACS in France does not need a certificate of no impediment (CNI) from the UK government Instead, the page continues, a self declaration form stating freedom to marry or register a PACS may be filed, together with an explanatory note That déclaration sur l’honneur (sworn statement in your own hand) plus the official explanatory note issued in place of the certificat de célibat and certificat de capacité matrimoniale is the document to print, complete, sign and file — and if both future spouses are British, both must submit one. A separate FCDO informative note on British birth certificates and change of name helps the registrar understand why British papers look the way they do, so file it alongside. Print the current versions from the gov.uk publication page itself on the week you file, because a registrar confronted with an unfamiliar foreign form is far easier to convince with a freshly printed official page than with an explanation from memory.

Witnesses deserve a paragraph of their own, because British couples often discover the rule late. The service-public.fr guide requires, for each témoin (witness), the surname, first name and further identifying details with supporting papers, and French law requires at least two and at most four adult witnesses present at the ceremony. Your witnesses need not be French and need not live in France, but they must be physically present, identified in advance in the file, and able to show identity documents on the day. Confirm their availability before the bans are published: replacing a witness means amending the file, and amending the file can mean re-publishing.

Three file-building reflexes save British couples most often. First, visit the chosen mairie before spending a pound: ask for its written checklist, its accepted age for birth certificates and apostilles, and whether it knows the 2024 British self-declaration — if the clerk has never seen it, show the printed gov.uk page at that first visit, not on the eve of the ceremony. Second, treat every foreign divorce as a file of its own: a decree absolute or final order, with apostille and sworn translation, plus, where the divorce was recent, proof that appeal periods expired. Third, keep a complete copy of everything filed and get a receipt: if the file is later said to be incomplete, the receipt proves what the office received and when, which matters for every challenge described in the second part of this article.

II. When the ceremony is blocked or the marriage is attacked: interviews, oppositions and nullity actions

A. The interview, the prosecutor and the opposition: how to challenge a postponement, a refusal or an opposition to your wedding

Every Franco-British wedding now passes through a filter that barely existed for EU nationals before Brexit: the pre-marriage interview. Article 63 makes « l’audition commune des futurs époux » (the joint interview of the future spouses) a condition of celebration, excused only in case of impossibility or where the papers alone show it is unnecessary in light of Articles 146 and 180. Where the registrar smells risk — from the papers, from the joint interview, or from a non-anonymous outside report — the same article authorises separate individual interviews, and where one future spouse lives abroad the registrar may ask the French diplomatic or consular authority to conduct the interview. For a British couple this means the interview is normal, not an accusation: prepare for it the way you would for any official appointment, attend together, answer consistently about how you met, your daily life, your plans and your families, and bring the same documents as in the file. A registrar who interviews you is doing the statutory job; a registrar who refuses to publish the bans without any interview and without reasons is not, and that distinction is the starting point of every challenge.

If the interviews raise a serious suspicion that the marriage could be annulled for lack of consent, the registrar must escalate: Article 175-2 of the Civil Code provides that « des indices sérieux laissant présumer » that « le mariage envisagé est susceptible d’être annulé au titre de l’article 146 ou de l’article 180 », « l’officier de l’état civil saisit sans délai le procureur de la République » The registrar informs you of the referral, and the prosecutor then has fifteen days to make a reasoned decision: let the wedding proceed, oppose it, or postpone it while an inquiry is carried out. The postponement, called sursis, is strictly capped: « La durée du sursis décidé par le procureur de la République ne peut excéder un mois renouvelable une fois par décision spécialement motivée. » At the end of the postponement the prosecutor must issue a fresh reasoned decision — proceed or oppose — and silence or delay beyond the statutory windows works in your favour when you go to court.

Each of those prosecutorial decisions can be challenged immediately, and speed is everything. Against a postponement or its renewal, the same Article 175-2 gives the remedy: « L’un ou l’autre des futurs époux, même mineur, peut contester la décision de sursis ou son renouvellement devant le président du tribunal judiciaire, qui statue dans les dix jours. » The decision of the court president can itself be taken to the court of appeal, which also rules within ten days. Against a full opposition, Article 177 of the Civil Code provides that « Le tribunal judiciaire prononcera dans les dix jours sur la demande en mainlevée formée par les futurs époux, même mineurs. » — the court rules within ten days on the application to lift the opposition — and Article 178 keeps the same ten-day rhythm on appeal. The prosecutor’s own power to oppose comes from Article 175-1: « Le ministère public peut former opposition pour les cas où il pourrait demander la nullité du mariage. » In practice, then, a blocked British wedding follows a fixed choreography: reasoned decision, application for lifting within days, hearing within ten days, appeal within ten days. File through a lawyer the moment the prosecutor’s letter arrives, attach the complete mairie file with the receipt, the interview record if you have it, and every proof of genuine married life — joint lease, joint account, travel together, correspondence with families — because the judge deciding in ten days rules on papers and first impressions.

The Court of Cassation confirmed this architecture in a recent opposition case worth knowing. In Cass. 1re civ., 25 March 2026, No 24-12.863, a couple challenged a prosecutor’s opposition to their wedding and the courts upheld it, recalling that the public prosecutor acts in this field for the defence of public order and that, faced with serious indications of a marriage liable to be annulled for lack of consent, it was for the prosecutor to gather all further information before deciding — in the Court’s words, « de recueillir toute information complémentaire avant de prendre sa décision ». The case concerned a wedding planned before a French consular authority, where the parallel opposition procedure applies, and the Court also confirmed that lifting the opposition can be sought at any time before the tribunal judiciaire. The lesson for a British couple marrying at a French mairie is symmetrical: the prosecutor is entitled to investigate, including through interviews conducted by investigators under prosecutorial authority, but every investigation ends in a reasoned decision that a judge reviews within days. Treat the inquiry as your opportunity, not only as a threat: each consistent statement, each shared bill, each witness who knows you as a couple becomes part of the court file that lifts the opposition.

Two further scenarios complete the picture. If the mairie itself refuses to publish the bans or to celebrate — for example by rejecting the British self-declaration out of hand — the refusal is an administrative stance you answer first with a formal written request for reasons, then with a referral to the prosecutor, who supervises civil status, and finally with an application to the tribunal judiciaire, which is the court for civil-status disputes. Never accept an oral « we don’t marry foreigners here » or « come back with a consular certificate »: ask for the refusal in writing, cite the printed gov.uk page stating that no CNI is issued, and escalate. If instead a third party opposes — a still-married former spouse, an ascendant, or a guardian — the service-public.fr guide explains that opponents must justify their action with a legal impediment such as simulated marriage, and the court decides lifting within ten days. In both cases the discipline is identical: written reasons, complete file, immediate court application, ten-day horizons.

B. After the wedding: sham and error annulments, strict time limits, and proving the marriage in France and Britain

A marriage celebrated at the mairie can still be attacked afterwards, and British spouses should understand the two classic weapons. The first is lack of consent: Article 146 of the Civil Code states that « Il n’y a pas de mariage, lorsqu’il n’y a point de consentement. » A mariage blanc (sham marriage, where neither spouse intends married life) or a mariage gris (where only one spouse is sincere and the other seeks a residence or other advantage) falls under this provision. Article 180 details who may sue: « Le mariage qui a été contracté sans le consentement libre des deux époux, ou de l’un d’eux, ne peut être attaqué que par les époux, ou par celui des deux dont le consentement n’a pas été libre, ou par le ministère public. » The prosecutor’s standing matters enormously in Franco-British cases, because sham marriages are typically denounced by the administration — during a residence-permit application, for instance — and the prosecutor then sues for annulment years after the wedding.

The Court of Cassation set the method for judging simulation in Cass. 1re civ., 19 September 2019, No 18-19.665, a case about a Las Vegas ceremony followed by a Paris wedding where one spouse turned out to be already married. The Court approved judges who reconstruct the spouses’ intention at the moment of celebration from circumstances before and after: presenting the ceremony to friends as a ritual without consequences, failing to publish the bans, taking no steps to transcribe the marriage on returning to France, and not giving the child the status the marriage would have conferred. Mirror those facts onto your own life and the advice writes itself: from the wedding day onwards, live the marriage in documents — joint home, joint finances, shared holidays with boarding passes kept, photographs with both families, prompt transcription steps — so that no later file can paint the ceremony as a favour between friends. The same decision contains a procedural point spouses often misunderstand: « aux termes de l’article 2247 du code civil, les juges ne peuvent suppléer d’office le moyen résultant de la prescription ; que cette règle s’applique même lorsque la prescription est d’ordre public » (Article 2247). Limitation must be raised by a party; the court will not invent it for you, so in any nullity suit, limitation is a plea to plead expressly and first.

Limitation periods are the second thing to master, because they are short and they run from the wedding, not from discovery. For lack-of-consent cases the general provision is severe: Article 184 of the Civil Code allows attack « 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 from celebration is a long shadow, and it explains why prosecutors can pursue sham-marriage annulments long after residence permits were granted on the marriage’s strength. For error on essential qualities — discovering, for example, a hidden criminal past, a concealed previous marriage or a fundamental lie about identity — the window is far shorter. In Cass. 1re civ., 20 May 2026, No 24-22.299, a husband who sued in 2023 to annul a 2017 wedding, arguing he had only understood the truth when a criminal court convicted his wife of violence against him, lost on limitation. The Court held: « Selon l’article 181 du code civil, la demande en nullité du mariage pour vice du consentement n’est plus recevable à l’issue d’un délai de cinq ans à compter du mariage. » (Article 181), adding that « s’il y a eu erreur sur les qualités essentielles de la personne, la date à laquelle l’époux a reconnu l’erreur est sans incidence sur le point de départ du délai de prescription. » Five years from the wedding, whatever the date of discovery: a British spouse who suspects a mariage gris must therefore sue quickly and must not wait for a criminal case or a divorce to clarify the picture. Note the asymmetry that follows: the deceived spouse has five years, while the prosecutor attacking the same marriage as a sham has up to thirty — another reason to build the paper trail of genuine married life from day one.

The final task after a successful wedding is proving it on both sides of the Channel. In France, the mairie issues the acte de mariage and, where the conditions are met, the livret de famille; order several full copies of the certificate in the weeks after the ceremony, because every administration — préfecture for the resident spouse’s file, caisse d’assurance maladie, banks, insurers — will ask for one less than three months old, and reorders from abroad take time. On the British side, a French civil marriage that complied with French formalities is recognised without any transcription formality: the gov.uk « getting married abroad » guidance frames the whole exercise as checking the local rules first and then registering the resulting certificate appropriately, and the marriage certificate with its apostille and sworn translation is the proof you file with British authorities, pension providers and insurers. If either spouse changes surname on marriage, read the FCDO informative note on British birth certificates and change of name before touching the passport: the United Kingdom has no French-style automatic name effect, and aligning the passport, the French acte de mariage and the residence permit under consistent names avoids years of mismatch letters. And because marriage remakes your property and succession position — default regimes, gifts between spouses, reserved shares for children — a wedding is also the moment to review any existing English will covering French assets, as explained in our guide to British wills and French houses after Brexit.

Conclusion

Marrying in France as a British citizen after Brexit is an exercise in translation in the widest sense: translating birth certificates through apostilles and sworn translators, translating the British absence of a no-impediment certificate into the French file through the 2024 self-declaration and its explanatory note, and translating a genuine relationship into the documents a registrar, a prosecutor or a judge can read. The commune rule in Article 74 fixes where you marry, the ten-day display of the bans fixes the earliest when, and the interview procedure in Articles 63 and 175-2 fixes how closely the state looks at your intentions — with the prosecutor’s fifteen days, one renewable month of postponement and ten-day court reviews supplying both the pressure and the protection. After the ceremony, Articles 146, 180, 181 and 184, read through the Court of Cassation’s rulings of 2019 and 2026, fix how and for how long the marriage can be challenged, and the five-year discovery-proof rule for error cases punishes anyone who waits. File early, file the self-declaration rather than chasing a certificate Britain does not issue, keep every receipt and every proof of shared life, and challenge any blockage in writing within days: the French wedding machine moves slowly for the unprepared and remarkably fast — ten days, time and again — for the spouse who knows the procedure.