I. The three refusal letters and why most of them fail

You return to your Paris flat after a few weeks abroad and find the parquet warped, the ceiling stained and a musty smell in the hallway. Or your tenant calls to say water is dripping through the bathroom ceiling. You declare the loss to your insurer, confident that your assurance multirisque habitation (comprehensive home insurance) will handle it. Then the letter arrives: claim refused. For a foreign owner managing French property from another country, that letter feels final. It rarely is.

French insurance law gives policyholders far stronger weapons than most refusal letters admit. Three standard grounds account for the large majority of water-damage refusals after a dégât des eaux (water-damage event): late declaration, wear and tear or lack of maintenance, and the unoccupied-home clause. Each one looks solid on insurer letterhead. Each one collapses if the insurer cannot prove specific facts. This guide explains, in order, how to dismantle each refusal and, if the insurer will not move, how to get paid by the person actually liable and force your insurer to take the claim back.

A preliminary point matters for everything that follows. Your relationship with your own insurer is contractual, while your relationship with the neighbour or the co-ownership whose installation caused the leak is delictual, meaning based on general civil liability. The two tracks run in parallel. Even if your insurer refuses to pay, the person who caused the damage still owes you compensation, and the general principles of French civil liability apply without needing any insurance contract at all. Article 1240 of the Civil Code states: “Tout fait quelconque de l’homme, qui cause à autrui un dommage, oblige celui par la faute duquel il est arrivé à le réparer.” That sentence, which means that any faulty act causing damage to another person obliges the person at fault to repair it, is the foundation of every claim against a neighbour whose washing machine flooded your ceiling. Its companion, article 1241, adds negligence and carelessness: “Chacun est responsable du dommage qu’il a causé non seulement par son fait, mais encore par sa négligence ou par son imprudence.” In plain terms, you do not need to prove that the upstairs neighbour deliberately flooded your flat; proving that a leaking joint, an overflowing appliance or a failure to maintain sanitary installations caused the damage is enough.

A. “You declared too late”: the forfeiture defence that requires proof of prejudice

The most common refusal letter cites late declaration of the loss. Article L113-2 of the Insurance Code obliges the policyholder: to notify the insurer of any loss likely to trigger cover as soon as the policyholder learns of it, within the contractual deadline, and it adds a protective floor: “Ce délai ne peut être inférieur à cinq jours ouvrés.” That means no French home-insurance contract can impose a declaration deadline shorter than five working days, reduced to two working days for theft. Many policies set exactly five working days, and insurers routinely reject claims declared on day six or seven. Here is what the refusal letter does not tell you: lateness alone is almost never enough.

The Court of Cassation has repeated for years that forfeiture for late declaration, known as déchéance (loss of cover as a sanction), is subject to two cumulative conditions. First, the sanction must be stipulated in the contract itself; a judge cannot invent it. Second, the insurer must prove that the delay caused it actual prejudice. On 21 January 2021 the Second Civil Chamber, in a decision published in the Bulletin, drew the full consequences. The Court held that where the forfeiture clause sets a declaration deadline below the five-working-day minimum, the clause cannot be enforced against the policyholder at all: “la déchéance pour déclaration tardive ne peut être opposée à l’assuré que si l’assureur établit que le retard dans la déclaration lui a occasionné un préjudice.” In other words, an insurer cannot rely on a late declaration unless it proves the delay harmed it, and it cannot rely on a clause that shortens the statutory minimum at all. The decision is published on the official site of the Court of Cassation at Cass. 2e civ., 21 Jan. 2021, No. 19-13.347, and the rule comes from the official summary of that judgment.

The Court confirmed the same requirement again in 2026. On 9 April 2026 the Third Civil Chamber restated the principle word for word: “la déchéance pour déclaration tardive d’un sinistre ne peut être opposée à l’assuré que si l’assureur établit que ce retard lui a causé un préjudice.” Read the full reasoning at Cass. 3e civ., 9 Apr. 2026, Nos. 24-12.608 and 24-13.070. Two chambers, five years apart, the same message: the insurer that invokes lateness must demonstrate concrete harm, for example that the delay prevented an expert inspection that would have changed the assessment, or that damage worsened because of the delay. A declaration sent on day eight for a leak that was already stable and documented by photographs will almost never meet that test.

The practical lesson for a foreign owner is simple. Declare immediately, even imperfectly: a short email or a notification in the insurer’s mobile application on the day you learn of the leak starts the clock in your favour, and you can complete the file later with the constat amiable de dégât des eaux (standardised joint water-damage report), photographs and invoices. Keep proof of the sending date. If you genuinely learned of the leak late, because the flat was empty or the tenant warned you weeks after the first stains, say so in writing and document it: the five-day period runs from knowledge, not from the leak itself. And if the insurer answers with a forfeiture letter, reply by registered letter asking two questions the insurer must answer: where exactly in the contract is the forfeiture clause, and what precise prejudice did the delay cause? Most files move again at that point.

One related trap deserves mention because it appears in the same letters. Some contracts require the policyholder to declare any new circumstances that aggravate the risk, and insurers occasionally argue that leaving the flat empty for months aggravated the risk without disclosure. That argument belongs to a different mechanism, with its own sanctions, and it cannot be recycled as a late-declaration forfeiture. Do not let the insurer mix the two.

B. “Wear and tear, poor maintenance, or an empty flat”: exclusions the insurer must prove

The second family of refusals invokes the nature of the damage rather than its timing: gradual seepage presented as wear and tear, a corroded joint presented as lack of maintenance, or mould presented as a ventilation failure by the occupant. The third invokes the absent owner: a clause reducing or excluding cover when the dwelling is unoccupied beyond a contractual period, typically thirty, sixty or ninety consecutive days. All three share one decisive feature of French insurance litigation: the insurer bears the burden of proving that the facts fit the exclusion. An exclusion clause is interpreted strictly, and a vague expert report stating that the installation “looked old” does not establish that the leak came from gradual deterioration rather than a sudden failure.

The distinction between sudden and gradual matters enormously in practice. Standard home policies cover sudden and accidental water damage: a burst hose, a cracked seal that gives way, an overflow. They exclude damage from knowingly neglected slow leaks and from humidity that the occupant allowed to develop. Between those poles lies the grey zone where most disputes live: a joint that had been weeping slightly before failing completely. Here the file often turns on expert evidence, and an insurer’s in-house expert who never visited the flat carries little weight against dated photographs, a plumber’s invoice describing a sudden rupture, or a bailiff’s report. Never accept a refusal based on a photograph-free expert opinion. Ask for the full expert report, check whether the expert actually inspected the premises, and commission your own contradictory assessment if needed, as explained in Part II.

The unoccupied-home clause requires particular attention from non-resident owners, because it targets exactly their situation. Such clauses exist and can be enforceable, but three conditions limit them. First, the clause must be clearly brought to the policyholder’s knowledge at subscription; a clause buried in a twenty-page booklet the owner never received is vulnerable. Second, the insurer must prove the factual condition, meaning the continuous vacancy beyond the contractual threshold, which is harder than it sounds when the owner can show caretaker visits, consumption records or a property manager’s invoices. Third, the insurer must still connect the vacancy to the loss where the contract requires it, and it cannot use the clause as a disguised late-declaration sanction without meeting the prejudice test described above. A second home that leaked because a nine-year-old supply hose burst would very likely have leaked with the owner present; the vacancy changed the extent of the damage, not its cause, and that distinction drives both negotiation and litigation.

Tenants and landlords face a mirror-image version of the same argument. Article 7 of the Act of 6 July 1989, the statute governing residential leases, provides that the tenant must: “De répondre des dégradations et pertes qui surviennent pendant la durée du contrat dans les locaux dont il a la jouissance exclusive, à moins qu’il ne prouve qu’elles ont eu lieu par cas de force majeure, par la faute du bailleur ou par le fait d’un tiers qu’il n’a pas introduit dans le logement” That means the tenant answers for deterioration occurring during the lease in the premises under the tenant’s exclusive control, subject to proof of force majeure, the landlord’s fault or a third party’s act. Day-to-day maintenance, including descaling, cleaning seals and reporting leaks promptly, falls on the tenant, while structural elements and hidden pipework remain the landlord’s responsibility. For foreign landlords this is the single most useful sentence to quote when a tenant blames the owner for damage the tenant let fester, and symmetrically the sentence tenants quote when a landlord blames them for a riser pipe that burst inside a wall. Read the current text at article 7 of the Act of 6 July 1989.

A useful contrast sharpens the point. For fire, the Civil Code reverses the burden: article 1733 provides that the tenant answers for fire unless the tenant proves a fortuitous event, a construction defect or communication from a neighbouring building, with the classic formulation: “Que l’incendie est arrivé par cas fortuit ou force majeure, ou par vice de construction.” Water damage has no equivalent presumption. Nobody is presumed liable for a leak; the claimant proves fault or custody, damage and causation. That is good news for a tenant wrongly accused of causing a leak, and a warning for an owner who sues without evidence: assemble the proof first, as Part II explains.

II. The counter-attack: from evidence to payment

Refusing the refusal is a procedure, not a tone of voice. French courts and mediators respond to files, and the files that win share the same anatomy: immediate written traces, a joint report or proof that the other side refused to sign one, dated photographs, invoices for emergency and preservation work, and an expert record established contradictorily, meaning with both sides invited to attend. Build that file from day one and every subsequent step, from the mediator to the judge, becomes easier.

A. Freeze the evidence and force a second look: joint report, contradictory expert, court-ordered assessment

The first forty-eight hours decide the file. Stop the source by closing the main valve, the vanne d’arrêt (main water shut-off valve), usually under the kitchen sink or in the entrance hall, and call the building manager, the syndic de copropriété (licensed co-ownership managing agent), immediately if the leak may come from common pipework. Photograph everything before any drying or repair: wide shots of each affected room, close-ups of the source and of every damaged item, with timestamps preserved. Keep originals uncompressed. Then fill in the constat amiable de dégât des eaux jointly with the neighbour or manager identified as the source; each side sends a copy to its own insurer. If the other side refuses to sign, note the refusal in writing and send your copy anyway with a registered letter describing the circumstances. Practical English-language guidance on the joint form and the five-day declaration, published by consumer information services in France, also describes the industry-wide convention IRSI (insurers’ water-damage claims-handling agreement): for smaller claims each policyholder’s own insurer pays directly, which is why declaring to your own insurer first is almost always the fastest route to an advance.
When the insurer’s expert produces an unfavourable report, challenge the method before the conclusion. You are entitled to the complete report, not a two-line summary in a refusal letter. Check four points: did the expert visit the premises or rule from photographs; were you invited to attend, so the assessment was contradictory; does the report distinguish the cause of the leak from the extent of the damage, since the repair of the leaking installation itself is generally not covered while the damage it caused is; and does it address suddenness with dated elements rather than general statements about age. If the answers disappoint, commission a counter-expertise and send it to the insurer by registered letter with a deadline to reconsider. Insurers reopen a significant share of files at this stage, because a contradictory counter-report transforms the litigation risk.

If repairs cannot wait, French procedure offers a purpose-built tool: the pre-trial expert assessment ordered in summary proceedings. Article 145 of the Code of Civil Procedure provides: “S’il existe un motif légitime de conserver ou d’établir avant tout procès la preuve de faits dont pourrait dépendre la solution d’un litige, les mesures d’instruction légalement admissibles peuvent être ordonnées à la demande de tout intéressé, sur requête ou en référé.” That means that where there is a legitimate reason to preserve or establish evidence before any lawsuit, investigative measures can be ordered on petition or in summary proceedings, at any interested party’s request. For water damage this typically means a court-appointed expert who visits, describes the disorders, identifies the origin and often proposes a breakdown of responsibilities, all recorded contradictorily. The current text, including the rule that the court where the building is located has sole jurisdiction when the measure concerns a building, is at article 145 of the Code of Civil Procedure. For a non-resident owner the strategic value is obvious: the evidence is frozen by a neutral expert even from abroad, through a local lawyer, before traces disappear under fresh paint.

Parallel to expertise, escalate in writing. Send the insurer a formal demand, a mise en demeure (formal notice to comply), by registered letter with acknowledgment of receipt, recapping the timeline, enclosing the evidence and citing the exact texts: the five-day rule and the prejudice requirement for forfeiture, and the strict interpretation of exclusions. If the insurer maintains the refusal, refer the dispute to the insurance mediator, the médiateur de l’assurance (independent insurance ombudsman), whose opinion is free and frequently followed; the referral suspends nothing but costs nothing and strengthens a later court file. Throughout, keep paying the premium and keep every receipt for emergency work, drying equipment and replacement accommodation: mitigation costs and preservation expenses form part of the recoverable loss when liability is established.

B. Sue the right person when your insurer will not pay: neighbour, co-ownership, or both

When your own insurer will not pay, turn to the liability track, which needs no insurance contract at all. Three defendants recur: the neighbour from whose flat the water came, the co-ownership represented by the syndicat des copropriétaires (co-owners’ association) when the origin lies in common areas, and, for rented flats, the tenant or the landlord depending on where the failure sits. The art of the file is suing the right one, or the right combination, because suing only the neighbour when the riser pipe belongs to the building wastes a year.

Against a neighbour, two provisions carry the claim. Article 1240 requires fault, and article 1242 adds custody of things: “On est responsable non seulement du dommage que l’on cause par son propre fait, mais encore de celui qui est causé par le fait des personnes dont on doit répondre, ou des choses que l’on a sous sa garde.” That sentence means you are liable not only for damage you cause directly but also for damage caused by things in your custody. A washing machine, a dishwasher, a water heater and private supply hoses are things in the custodian’s keeping; the victim proves the thing’s involvement in the damage, and the custodian escapes only by proving force majeure or the victim’s fault. In a leak from the flat above, identifying the appliance or installation and documenting the water path through the expert report usually suffices. Read the provision at article 1242 of the Civil Code, with the general fault principles at article 1240 and article 1241.

Against the co-ownership, the statute is direct. Article 14 of the Act of 10 July 1965 on co-ownership states: “Le syndicat est responsable des dommages causés aux copropriétaires ou aux tiers ayant leur origine dans les parties communes, sans préjudice de toutes actions récursoires.” That means the co-owners’ association is liable for damage originating in the common areas, without prejudice to its own recovery claims against whoever is ultimately at fault. Burst riser pipes, leaking roofs, defective common waterproofing and overflowing common gutters all point here. The current text is at article 14 of the Act of 10 July 1965. The companion provision, article 9, governs everyday co-ownership life: each co-owner freely uses the private and common areas on condition of harming neither the other co-owners’ rights nor the building’s purpose: “il use et jouit librement des parties privatives et des parties communes sous la condition de ne porter atteinte ni aux droits des autres copropriétaires ni à la destination de l’immeuble.” It also requires eight days’ notice before works needing access to private areas, except for safety or conservation emergencies, and forbids obstructing collective works decided by the general meeting. See article 9 of the Act of 10 July 1965. In a leak file, article 9 does quiet but important work: it founds the claim against the neighbour who refuses access for leak detection or repair, and it frames the duty to tolerate urgent investigations.
Crucially, you do not have to choose between the neighbour and the co-ownership when the origin is uncertain. On 26 January 2022 the Third Civil Chamber quashed an appeal decision that had declared a victim’s claim against a co-owner inadmissible on the ground that only the co-owners’ association could answer for disorders coming from terraces held as common areas under exclusive use. The Court ruled: “En statuant ainsi, alors que la responsabilité du syndicat au titre de l’article 14 précité n’est pas exclusive de la responsabilité délictuelle encourue par un copropriétaire, la cour d’appel a violé les textes susvisés.” That means the association’s liability under article 14 does not exclude the delictual liability of an individual co-owner. Sue both, let the expert sort out the respective roles, and let the court apportion. The judgment is at Cass. 3e civ., 26 Jan. 2022, No. 20-23.614. For a foreign owner who cannot inspect the building’s entrails from abroad, this belt-and-braces approach is not aggression; it is prudence.

For rented flats, allocate the claim along the lease. The tenant answers for deterioration in the premises under exclusive control and for day-to-day maintenance, while the landlord answers for structure, hidden pipework and equipment that fails from age. In practice the foreign landlord’s file typically combines three demands: against the tenant for breach of maintenance and reporting duties, against the co-ownership if common installations are involved, and against the landlord’s own non-occupant-owner insurance, the assurance propriétaire non occupant (landlord’s own building insurance), for the structure. Symmetrically, the tenant’s file targets the landlord’s obligation to deliver and maintain decent, watertight premises. Where unpaid rent complicates the relationship, remember that the standard termination clause for non-payment takes effect only six weeks after an unsuccessful formal payment order: “Cette clause ne produit effet que six semaines après un commandement de payer demeuré infructueux.” See article 24 of the Act of 6 July 1989. A landlord cannot use a leak dispute as a shortcut to terminate a lease; the rent track and the damage track stay separate.

A Paris and Île-de-France note is warranted, since many foreign-owned flats sit there and the procedure has local texture. Water-damage liability and insurance disputes for Paris buildings go to the Paris judicial court, where the fourth pole’s second chamber handles a large share of co-ownership and insurance litigation, so expect judges who have seen every variant of the burst-hose file. The practical chain runs from the syndic‘s emergency plumber to the insurer’s expert within weeks, and a summary assessment under article 145 is typically ordered within one to three months. Assemble from abroad through a local correspondent: keys with the caretaker or manager, written authority to enter, and a sworn translator for any document you will file. Keep the damaged materials until the contradictory expert has seen them; premature renovation is the most common way strong files die. Readers facing the wider question of who pays for storm and water damage, beyond the refusal scenario, will find the general allocation rules, including natural-event cover, in our companion guide to storm and water damage: who pays and how foreign owners get compensated, while owners structuring or defending a French property investment can turn to our Paris real-estate law practice for the full range of purchase, co-ownership and litigation issues.

Conclusion

A refusal letter is an opening position, not a verdict. Late declaration defeats cover only where the contract stipulates forfeiture and the insurer proves concrete prejudice, a double lock the Court of Cassation enforces strictly, including against clauses that shorten the five-working-day minimum. Wear-and-tear and unoccupancy exclusions bind only as far as the insurer proves each of their factual conditions, strictly interpreted, against dated evidence. And behind the insurance track always stands the liability track: the neighbour’s custody of appliances under article 1242, the co-ownership’s responsibility for common areas under article 14, and the right to sue both together confirmed in 2022. For the foreign owner the method never varies: declare in writing on day one, photograph before touching anything, sign or formally propose the joint report, demand the full expert file, commission a counter-assessment, freeze evidence through a court-ordered assessment where needed, escalate through formal notice and the insurance mediator, and sue the right defendants with an apportioned claim. Handled in that order, most refusals are overturned long before a judge rules, and those that reach court meet a file built to win.