1. Cut off the water at the source (main stopcock or the room’s shut-off valve).
2. Cut the power to the affected area (or the main circuit breaker if the water is spreading).
3. Photograph the damage with a timestamp BEFORE touching anything — every photo is evidence.
4. Report the claim to your insurer within 5 working days (a legal obligation under Article L. 113-2 of the French Insurance Code).
5. Don’t throw anything away, don’t sign anything lightly — wait for the expert assessment to understand the origin of the leak.
The major trap: Letting things dry out without photos and without an expert means losing the proof of the source. An expert who intervenes within 48 hours can establish where the leak came from. Beyond that window, the evidence fades.
Why the first 48 hours are critical
An expert dispatched within 48 hours: your guarantee of the truth
When water damage occurs, the source isn’t always obvious. Is it a hidden plumbing leak? A problem from the upstairs neighbour’s unit? Infiltration linked to a building defect?
An independent expert, instructed within 48 hours, will examine:
- The state of the water (colour, smell, precise location of the source).
- Signs of dampness and material damage.
- The fittings involved (taps, hoses, pipework).
- How the water spread and which areas were affected.
The later an expert intervenes, the weaker the evidence becomes: the water evaporates, the marks fade, the walls dry out.
The trap: relying solely on the insurer’s expert
Your insurer may send an expert, but that person represents the interests of the insurance company. If there’s any doubt about the origin of the claim — especially if it involves a third party’s liability (property manager, neighbour, occupant of another floor) — that single expert’s findings could go against you with no recourse.
The solution: From your very first call to your insurer, ask for the option of an independent expert *on your side*. Or instruct one directly for a pre-assessment report. Cassini Expertise works across Antibes, Cannes and the wider PACA region to establish the causes of the incident and defend your rights.
The 5 steps explained: a complete guide
Step 1: Cut off the water at the source
This is the most urgent step. Locate:
- **The main stopcock** for your flat or house (often under the kitchen sink, in a cupboard, or outside if it’s a house).
- Or the **shut-off valve for the affected area**: under the bathroom sink, behind the washing machine, under the basin…
Turn the valve counter-clockwise until the water stops. Then wipe up any standing water with towels (keep them as evidence).
Step 2: Cut the power
Water and electricity don’t mix. If the water has reached sockets, appliances or cables:
- Switch off the relevant breakers at the consumer unit.
- Do not touch the water if it’s in contact with any electrical points (risk of electrocution).
- Call an electrician if you’re unsure about safety.
A flooded property must be electrically « made safe » again before it can be reoccupied.
Step 3: Photograph everything with a timestamp BEFORE tidying up
This is your evidence. As soon as the water stops flowing, photograph:
- Every area the water has reached.
- Damp marks on walls, floors and furniture.
- Damaged appliances/fittings (kitchen units, swollen flooring, etc.).
- The source of the leak: burst pipe, worn seal, split hose, etc.
- The extent of the damage: water height on the walls, flow paths.
Tip: Turn on your phone’s timestamp feature (Settings → Photos). Take videos too: they convey the scale of the damage better than a still photo.
Step 4: Report the claim within 5 working days (a legal obligation)
Legal basis: Article L. 113-2 of the French Insurance Code requires the policyholder to report a claim to their insurer « without delay and at the latest within the time limits set out in the policy ».
In practice, home insurance policies require the claim to be reported within 5 working days (the exact deadline can vary, so check your policy).
How to report it:
- Call your insurer today (even before any repairs are made).
- Give the date/time, a brief description of the incident, and the damage known so far.
- Ask for a claim file, a reference number, and the contact details of the claims handler.
- Follow up with a registered letter with acknowledgement of receipt, including photos and a detailed account.
Failing to report the claim means losing your right to compensation.
Step 5: Don’t throw anything away, don’t sign anything lightly
Don’t throw anything away: Damaged materials (carpets, furniture, floor coverings) are evidence. Let them dry out or store them. The expert will need to examine them to assess the damage.
Don’t sign anything without reading it: Your insurer or the managing agent may present you with documents (discharge receipts, statements, amendments). Read every line. If you sign a damage discharge before the full assessment is complete, you may be giving up future compensation.
When the flooding turns into a dispute: neighbour, property manager, common areas
Flooding caused by an incident at the upstairs neighbour’s
Your home has been flooded by water from your neighbour (a leak in their bathroom, a leaking appliance). Liability breakdown:
- **The neighbour’s civil liability:** They must compensate you for the damage if their negligence is established (an unmaintained hose, a known issue not reported to the property manager).
- **Their insurance’s role:** Their civil liability cover is triggered. You can file a claim with them as the injured party.
- **The property manager’s role:** In a co-owned building, the property manager can also be held liable if they failed to maintain the common areas.
An independent expert is essential to prove that the fault lies with the neighbour, not with a structural deficiency in the building.
Flooding from a common area (roof, walls, shared pipework)
If the water is coming from the roof, poorly sealed windows, or shared pipework:
- **Liability:** Falls on the property manager/the co-ownership (maintenance duty).
- **Procedure:** Report it to both your insurer AND the property manager. The expert will determine whether the defect stems from the building’s construction or its collective maintenance.
- **Recourse:** You’re covered, but the property manager can be pursued for indemnity by the insurer.
Multiple sources of damage: who pays for what?
Flooding from the neighbour + a shared plumbing leak + infiltration through the roof = shared liability. Each expert (independent, yours, the insurer’s) gives an opinion. In case of disagreement, the matter can end up before a judge. That’s why Cassini Expertise produces robust reports: bailiff’s findings, dated photos, measurements, and reasoned conclusions.
How Cassini Expertise intervenes: the tools behind the assessment
Cassini Expertise specialises in incident assessment and amicable expert appraisals across Antibes, Cannes, Nice and the wider PACA region. Our intervention eases tensions, establishes the facts, and speeds up the compensation process.
Stages of our intervention
1. Site visit within 48 hours (the urgent step)
We move quickly to examine the water before it evaporates and the marks before they fade. We take measurements of water height and the affected area, along with timestamped photos (our own, certified).
2. Establishing the source
We identify the source of the incident:
- Did a washing machine hose fail?
- Did hidden pipework burst?
- A faulty stopcock?
- Infiltration through the roof, a window, or a partition wall?
- Rainwater overflow?
- Rising groundwater or water from the basement?
This source determines liability and compensation.
3. A thorough photographic report
A complete photographic report, with captions, orientations and measurements. Every instance of damage is put in context: the flooded area, depth, water marks on walls, lateral spread, and damage at varying heights (which tells us whether there was a flow of water or stagnation).
4. Assigning liability
Our conclusion sets out:
- **The precise source of the incident.**
- **Liability:** Occupant, property manager, third party?
- **Applicable cover:** Home insurance, civil liability, building insurance?
- **Possible courses of action:** Who to turn to for compensation.
This report is then submitted to your insurer, the property manager, or the court if required.
Key tools we use in our assessments
- **Moisture meter:** Measures the moisture level in materials. Reveals past or current infiltration.
- **Thermal camera:** Detects cold spots (thermal bridges, cold-water infiltration) and colour variations that indicate a leak or dampness.
- **Laser measure:** Precise measurement of affected areas, water height, and spread.
- **Endoscopic camera:** Inspects the inside of partition walls, ducts, and behind wall coverings (without any damage).
- **Sampling:** Chemical analysis of the water if there’s doubt about its origin (rainwater, sewage, mains water).
Frequently asked questions: flooding and insurance claims
My insurer says « we don’t have an independent expert, we’ll handle it ». Should I accept that?
Not automatically. The expert sent by your insurer serves the insurer’s interests. If there’s a risk of dispute (a neighbour’s liability, a defect attributable to the property manager, a disagreement between insurers), bring in your own independent expert, instructed by you directly. Cassini Expertise can intervene alongside the insurer’s expert or on its own, depending on your needs. A solid, independent report speeds up settlement: the insurer knows the facts can’t be disputed.
I’ve thrown away the wet belongings. Is that a problem?
Yes, it’s a significant issue. Those items were evidence. An expert can’t examine something that no longer exists. If you photographed them beforehand, it’s less serious — the photo still stands as proof. But if you also had wet structural materials (flooring, insulation, timber) and threw them away without photos, you lose your recourse over hidden damage still to come (future mould, rotting wood, etc.). Going forward: photograph first, then store items until the expert has seen them.
How long before my insurer responds?
Once a claim has been reported, the insurer has 30 to 60 days (depending on the policy) to send out an expert. The expert then has 10 to 20 days to produce their report. All in all, expect 2 to 3 months before you receive initial compensation (excluding complex cases). You can speed things up by providing all the evidence upfront (photos, invoices, quotes) and following up regularly with your claims handler.
Mould after flooding: is it covered?
Mould that develops as a result of flooding is generally covered if the original incident (the leak, the infiltration) is covered. But the longer you wait before getting an assessment and treatment, the more the mould takes hold. Also worth reading: [Treating mould after bathroom flooding](/moisissures-salle-de-bain-apres-inondation/) — a guide on drying, ventilation and prevention measures.
Have you just suffered flooding in Antibes, Cannes or Nice?
Act now. The first 48 hours are critical. Cassini Expertise responds urgently to establish the source of the incident, photograph the damage, and defend your rights with your insurer, the property manager, or in court.
Contact us
- **Areas covered:** Alpes-Maritimes (06) & Var (83)
- **Phone:** 04 22 46 06 04
- **Email:** [email protected]
Available for prompt site visits, urgent assessments, and full follow-up on your claim.
Related reading
Cassini Expertise
Expert du bâtiment indépendant — Antibes (06·83·13·40)
📅 Mis à jour le 25/09/2026 — Cassini Expertise, expert bâtiment indépendant (06·83·13·40).