Premarital investigation: say yes with full knowledge

Written by Guillaume Pouillier, CNAPS-licensed private detective, licence no. AGD 095-2024-03-06-20190240581 · Last updated: July 12, 2026

A premarital investigation is not a trial of intent: it is a consistency check before one of the heaviest legal commitments there is, community of property, maintenance obligations, parental authority. It is as old as the profession, and more relevant than ever in the age of online dating and international marriages. Our CNAPS-licensed detectives conduct it with the tact the subject demands: the person verified will never know. This page explains when it is wise, what it covers, and how it remains both lawful and invisible.

Why verify before marrying?

Because marriage is a legal act with immediate patrimonial effects, and some discoveries are unfortunately made afterwards: concealed debts, a previous divorce never mentioned, a double life, a marriage motivated by papers or property. Verifying beforehand protects both spouses, and the marriage itself.

A union is built on trust, and that is precisely why doubt is corrosive: it grows in silence, poisons the relationship and erupts at the worst moment. The premarital investigation has two outcomes, both salutary, either it dispels the doubt and the commitment is made with a free mind, or it reveals a real problem while there is still time to talk or to walk away.

In the majority of our files, the result is reassuring. That is the point: nobody should marry carrying a worry that a week of verification could have extinguished. And nobody should discover after community of property what a three-page report would have established before it.

What do we verify about a future spouse?

The consistency of the identity and background, the actual marital situation (divorces, previous unions, unmentioned children), the apparent financial situation (visible debts, proceedings, actual activity), the effective lifestyle and, where relevant, the signals of an interested marriage.

The scope is tailored to your situation at the confidential consultation, and strictly limited to what your decision requires.

“Interested” marriage: which signals deserve to be taken seriously?

Haste to formalise, an insisted-upon patrimonial imbalance, gradual isolation from your close circle, a history of short and lucrative unions, and any pressure around the matrimonial regime or early gifts: signals which, accumulated, deserve verification.

The interested marriage, whether it targets assets, maintenance or a residence permit, follows recognisable scripts: the relationship moves fast, the future spouse’s circle remains vague or inaccessible, patrimonial questions arrive early under innocuous guises. In isolation, each element is innocent; it is their accumulation and chronology that speak.

Our checks then document the precedents (previous unions, any published complaints, identity inconsistencies) and the actual lifestyle. Families also instruct us for an elderly parent whom a late marriage would expose, in connection with protection against undue influence and breach of trust.

How does the investigation remain discreet and lawful?

Open sources, public registers, observation in public space: nothing else. No approach to the person, no stratagem, no intrusion. Your step is covered by professional secrecy (art. 226-13 of the French Criminal Code) and the report will only ever be communicated to you.

Discretion is non-negotiable, for reasons of effectiveness (an alerted person smooths their behaviour) but above all of respect: if the doubt dissolves, the relationship must be able to continue intact. Our investigators are trained in that particular restraint; it is the same professionalism that makes our reports admissible if, conversely, the situation were to reach a court.

The legal framework is that of the background check: a documented legitimate interest (a major commitment in preparation), minimal collection, the GDPR respected at every step.

When should the verification be launched?

Ideally before the irreversible decisions: publication of the banns, choice of the matrimonial regime, a joint purchase, a gift. Allow one to three weeks of investigation, the right calendar is therefore two to three months before the planned date, or as soon as the doubt sets in.

1. Free confidential consultation. You set out the situation; we tell you what is verifiable, how fast, and whether the investigation is justified at all.

2. Written scoping. Scope, flat fee, deadline, nothing starts without your agreement, and you may stop at any time.

3. Verification. Documentary first, fieldwork after if necessary, proportionate to the initial doubt.

4. Report. Delivered in person or through a secure channel, to you alone. What you do with it is yours to decide.

International marriage: which specific checks?

When the future spouse comes from another country, three verifications become essential: the actual marital situation in the country of origin (a local divorce is not always pronounced there), the identity and background on the spot, and the economic consistency of the life led there. Our WAD network verifies at the source.

International unions concentrate the difficulties: the registers of the country of origin are not accessible from France, the documents produced are hard to authenticate, and the personal circle, which reveals a great deal in a classic file, remains out of reach. That is exactly where an accredited local correspondent changes the game: he verifies civil status at the register, the claimed activity on the spot and the reputation within the community.

These checks also protect against the cross-border “serial marriage”, where the same spouse strings together unions in several countries without the previous ones being dissolved. An apparent bigamy discovered before the ceremony spares the French spouse years of nullity proceedings, and patrimonial consequences no marriage contract could have caught up with.

Two typical situations, anonymised

A future husband, an “international consultant”, whose absences were explained by an undivorced family abroad; a sincere fiancée whose supposedly troubled past was mere homonymy, the wedding went ahead, the doubt extinguished.

The consultant with two homes. His long “assignments abroad” intrigued his future wife. Verification establishes a marital situation never dissolved in his country of origin, and a household still living there. The client broke off before the banns were published, and before the joint purchase that was to follow, funded essentially by her own contribution.

The homonym. An online search had associated a client’s fiancée with a conviction for fraud. Our checks demonstrate a strict homonymy: different birth date, different background, no connection whatsoever. The wedding took place, and the client wrote to us that the report had “extinguished a year of anguish in three pages”. Verification cuts both ways, and its happiest use is precisely this one: clearing an innocent person of a suspicion the internet had manufactured.

How much does it cost?

The premarital investigation falls under administrative enquiries: from €350 (excl. VAT) for the documentary module. Field observation is invoiced at €85/hour (excl. VAT) (full day €850). A free written quote follows the confidential consultation, and a closed flat fee precedes any assignment.

At the scale of a marriage, and of its patrimonial effects, the cost of verification is trifling. Most files are handled between the documentary flat fee and a few field sessions.

See the full price list.

Frequently asked questions