How to Claim Garantie Décennale in France Online: Notify the Insurer, Prepare an Expertise and Meet the Deadlines

If you have discovered serious structural defects in a French property, cracking foundations, a leaking roof that compromises habitability, or subsidence threatening stability, you need to know how to claim garantie décennale in France online before the strict ten-year limitation window closes. Under Articles 1792 to 1792-6 of the French Civil Code, every constructor is liable for defects that affect the structural soundness of a building or render it unfit for its intended purpose for a period of ten years from the date the works are formally accepted (réception des travaux). This guide provides the complete, step-by-step online workflow: identifying the right insurer, drafting notification emails and registered letters, organising an expertise, and knowing exactly when to escalate to court.

Every template and checklist below is designed to be used immediately, whether you are a homeowner, property manager, or purchaser pursuing a decennial warranty claim in France.

What Is the Garantie Décennale? Legal Basis and Who Is Liable

The legal trigger, Article 1792 et seq.

The garantie décennale is a strict-liability regime codified in Articles 1792 through 1792-6 of the French Civil Code, as published on Legifrance. It imposes liability on any person who builds a work (ouvrage), or who supplies materials that become inseparable from the structure, for damage that appears within ten years of the réception des travaux. The builder does not need to have been negligent; the mere existence of qualifying damage is enough to trigger the obligation.

What types of damage are covered

According to Service-Public, the garantie décennale covers two categories of defect. First, damage compromising the solidity of the structure itself, for example, foundation failure, load-bearing wall collapse, or severe roof deterioration. Second, defects that render the building unfit for its intended purpose (impropre à sa destination), such as chronic water infiltration making rooms uninhabitable, or a malfunctioning heating system that cannot keep a dwelling at a liveable temperature. Purely cosmetic issues, minor paint cracks, surface scratches, fall outside the décennale and are instead covered by shorter guarantees (garantie de parfait achèvement or garantie biennale).

Who is liable and the mandatory insurance requirement

All “constructors” within the meaning of Article 1792-1 are liable: main contractors, architects, engineers, surveyors, and subcontractors whose work is incorporated into the structure. French law requires each of these professionals to hold mandatory decennial insurance (assurance décennale). The attestation d’assurance décennale, a certificate proving valid cover, must be supplied before works begin. Insurers such as SMABTP and APRIL publish detailed guidance on this obligation.

Do You Need Assurance Dommages-Ouvrage or a Direct Garantie Décennale Claim?

Before filing your claim, determine whether you hold an assurance dommages-ouvrage (DO) policy. Under French law, as described by Service-Public and reinforced by insurer guidance from Capifrance, the DO is a first-party insurance policy taken out by the property owner at the time of construction. It is designed to pre-finance repairs without waiting for liability to be established against the builder. The DO insurer then exercises its subrogation rights against the constructor’s décennale insurer.

Industry observers recommend a simple decision flow for homeowners:

• If you have a DO policy: Notify your DO insurer first, this is the fastest route to indemnification. The DO insurer is required to respond with a coverage decision within sixty days of receiving a complete claim.
• If you do not have a DO policy (or it has lapsed): File your demande d’indemnisation décennale directly against the builder’s decennial insurer. This route typically takes longer but remains fully available.
• If the builder is uninsured or untraceable: You may need to pursue the builder personally and, in parallel, consider applying to the Fonds de Garantie or initiating court proceedings.

How to Claim Garantie Décennale France Online, Immediate 4-Step Action Plan

When you discover a qualifying defect, time is critical. The following four steps form the “must do now” checklist for anyone learning how to claim garantie décennale in France online.

Step 1, Secure and organise your evidence

Before contacting anyone, gather and preserve every piece of evidence related to the defect. The table below summarises what you need:

Step 2, Find the builder’s insurer

Check your construction contract and the attestation décennale for the insurer’s name and policy number. If you do not have these documents, contact the builder directly and request the attestation in writing. Many French insurers, including SMABTP, maintain online portals where you can verify active policies. You can also search the Registre des Intermédiaires en Assurance (ORIAS) database online to confirm an insurer’s registration.

Step 3, Notify the insurer by email and registered letter

Send a formal notification to the builder’s décennale insurer (or your DO insurer, if applicable). Best practice is to submit both a digital notification via the insurer’s email or online claims portal and a lettre recommandée avec accusé de réception (LRAR) for legal certainty. Your email subject line should read: “Déclaration de sinistre, garantie décennale, Police n° [number], [your property address]”. Attach all evidence listed in Step 1 as PDF or high-resolution image files. Keep screenshots of every online submission and download confirmation receipts.

Step 4, Send a mise en demeure to the constructor

In parallel with the insurer notification, send a mise en demeure (formal demand letter) to the constructor by LRAR. This letter demands that the builder acknowledge the defect and propose remedial action within a stated deadline, typically fifteen days. A mise en demeure constructeur is not legally required to trigger the garantie décennale, but it creates an evidential record and may interrupt the running of prescription periods.

Notifying the Insurer, Step-by-Step Online and Registered Mail Templates

Online portals and insurer email submission

Most major French décennale insurers now accept claims through dedicated online portals. When filing online, you will typically be asked to provide: the policy number, the date of réception des travaux, a detailed description of the defect, the date it was first noticed, and supporting documents (uploaded as PDF, JPEG, or ZIP files). Always note the claim reference number generated by the portal and take a screenshot of the confirmation page with its timestamp. If the insurer does not have an online portal, send an email to the claims department address listed on the attestation or the insurer’s website, using the template below.

Drafting the insurer notification email, annotated template

Below is a ready-to-use email template for your demande d’indemnisation décennale. Adapt the bracketed sections to your situation:

Subject: Déclaration de sinistre, Garantie décennale, Police n° [POLICY NUMBER], [PROPERTY ADDRESS]

Madame, Monsieur,

Je soussigné(e) [YOUR FULL NAME], propriétaire du bien situé au [FULL PROPERTY ADDRESS], vous déclare par la présente un sinistre relevant de la garantie décennale souscrite par [BUILDER NAME] auprès de votre compagnie sous la police n° [POLICY NUMBER].

Les travaux ont fait l’objet d’une réception en date du [DATE OF RÉCEPTION]. Les désordres constatés sont les suivants: [DETAILED DESCRIPTION, nature, localisation, étendue, date de découverte].

Vous trouverez en pièces jointes: (1) le procès-verbal de réception des travaux; (2) l’attestation d’assurance décennale; (3) les photographies datées des désordres; (4) le contrat de travaux et les factures; (5) toute correspondance antérieure avec le constructeur.

Je vous prie de bien vouloir accuser réception de la présente déclaration et de me communiquer les suites que vous entendez y donner dans les meilleurs délais.

Veuillez agréer, Madame, Monsieur, l’expression de mes salutations distinguées.

[YOUR NAME, ADDRESS, TELEPHONE, EMAIL]

Sending a lettre recommandée avec accusé de réception, lettre type garantie décennale

The LRAR serves as irrefutable proof of notification under French law. The content should mirror the email template above, but it must be printed, signed by hand, and sent via La Poste’s registered mail service (available online at laposte.fr). Request the accusé de réception (return receipt) and store the tracking number. The date stamped on the accusé de réception constitutes the official date of notification, critical for establishing that you acted within the ten-year prescription period. Keep a photocopy of the letter and all enclosures before mailing.

Key practice point: Always send both the email and the LRAR. The email provides speed; the LRAR provides legal certainty. Save all receipts, screenshots, and tracking numbers in a dedicated digital folder.

Preparing and Managing an Expertise Construction

Types of expertise: amiable, contradictoire, and référé-expertise

Once the insurer acknowledges your claim, an expertise construction (expert assessment) will be arranged to evaluate the defect, determine its cause, and estimate repair costs. There are three main types of expertise used in garantie décennale claims in France:

When to request a référé-expertise

If the defect poses an immediate threat to structural stability, occupant safety, or risks worsening rapidly (for example, an active water leak eroding foundations), you should apply to the Tribunal judiciaire for a référé-expertise under Article 145 of the French Code of Civil Procedure. This is an emergency application; the court typically schedules a hearing within days and can appoint a judicial expert (expert judiciaire) within one to six weeks. The expert’s report will carry significant evidentiary weight in any subsequent proceedings. Early indications suggest that courts increasingly expect claimants to file référé applications promptly when damage is escalating.

How to prepare for the expert visit

Thorough preparation can materially affect the outcome of the expertise. Use this checklist before the expert arrives on site:

• Access: Ensure the expert can access all affected areas, remove furniture, unlock rooms, provide keys to common areas.
• Evidence pack: Have a printed and digital copy of your full claim file (see the documents checklist section below) ready for the expert to review.
• Measurements: If possible, take your own measurements of cracks, displacement, or moisture readings and note them with dates.
• Photographs: Prepare a chronological photo log showing the defect’s progression. Label each image with the date, location, and a brief description.
• Witnesses: If neighbours or tradespeople have observed the defect, ask them to provide written statements or to be available during the visit.
• Questions: Prepare a list of questions you want the expert to address, for example, whether the defect is linked to the original construction or to subsequent modifications.

What an expert report typically contains, and common pitfalls

A well-prepared expert report will describe the property, the defect observed, the probable cause, whether the defect falls within the scope of the garantie décennale, and an estimate of repair costs. The likely practical effect of a thorough report is that it either compels the insurer to settle or provides the foundation for court proceedings. Common pitfalls include: allowing the expertise to be conducted without the claimant present (you have a right to attend), failing to challenge factual inaccuracies in the draft report, and not submitting a written dire (observation) within the deadline set by the expert. If you disagree with the expert’s conclusions, you can submit written objections and, in court-ordered expertises, request a second opinion.

If the insurer refuses to pay or delays

Where the insurer disputes the claim after receiving the expert report, you should immediately send a new mise en demeure by LRAR demanding payment within a specified period (typically thirty days). If this is ignored, the next step is to bring the matter before the Tribunal judiciaire, either via a référé (urgent hearing) for provisional measures, or through ordinary proceedings (assignation au fond) for a full determination of liability and damages.

Key Deadlines and Limitation Rules for the Garantie Décennale

Under Article 1792-4-1 of the French Civil Code, as confirmed by Service-Public, the ten-year limitation period begins on the date of the réception des travaux, the formal acceptance of the completed works by the owner. If the réception took place on 15 March 2018, for example, the garantie décennale expires at midnight on 15 March 2028. Any claim filed or proceedings initiated after this date will be time-barred.

The prescription period can be interrupted by several events recognised under French law. Filing a court action (including a référé-expertise application) interrupts prescription entirely and restarts the clock. A formal acknowledgement of the defect by the builder or the insurer also interrupts prescription. Importantly, merely sending a mise en demeure does not interrupt the prescription in all cases, it may only suspend it for a limited period under certain conditions. Industry observers expect that claimants should treat a mise en demeure as a preliminary step and not rely on it alone to preserve their rights.

As a practical timeline, aim to follow this schedule:

• Within 1–2 weeks of discovery: Secure all evidence, identify the insurer, send the notification email and LRAR.
• Within 8–12 weeks: Follow up with the insurer, arrange the expertise appointment, and send the mise en demeure to the constructor.
• Within 3 months: The expertise should be completed or, if the insurer is uncooperative, a référé-expertise application should be filed.
• Immediately (if urgent): Where there is an active safety risk, file for a référé-expertise within days.

What to Include in Your Claim File, Documents Checklist

A complete, well-organised claim file dramatically increases the speed and likelihood of a successful outcome. Assemble the following documents before submitting your claim to the insurer:

• Attestation d’assurance décennale of the builder (original or certified copy)
• Procès-verbal de réception des travaux (with or without reservations)
• Construction contract (devis signé, marché de travaux)
• Invoices for the works carried out
• Architectural plans and technical drawings
• Dated photographs and videos of the defects, with descriptions
• Correspondence with the builder (emails, SMS, WhatsApp messages, letters)
• Records of any previous repairs attempted
• Witness statements (written, signed, and dated)
• Assurance dommages-ouvrage policy (if you hold one)
• Your contact details (full name, address, phone, email)

When submitting online, use a clear file-naming convention to help the insurer’s claims handler locate documents quickly. A suggested format is: [ClaimRef]_[DocType]_[Date].pdf, for example, DEC2026-001_PVReception_2018-03-15.pdf. Compress all files into a single ZIP archive for portal upload, and keep a local backup of the entire package.

If the Insurer Refuses or Delays, Next Legal Steps and Remedies

Mise en demeure, when and how to escalate

If the insurer has not responded within a reasonable period, or has explicitly denied the claim, send a formal mise en demeure by LRAR. The letter should state: (1) a summary of the claim already submitted; (2) the insurer’s failure to respond or its unjustified refusal; (3) a demand to indemnify or appoint an expert within thirty days; and (4) a warning that legal proceedings will be initiated if the demand is not met. This letter creates a clear evidential trail and demonstrates that you have exhausted reasonable pre-litigation steps.

Référé and ordinary proceedings

Where the mise en demeure produces no result, two judicial routes are available. A référé (urgent interim application) before the Tribunal judiciaire can secure provisional payment for urgent repairs, preservation of evidence, or appointment of a judicial expert. The hearing is typically scheduled within two to four weeks. For a full determination of liability and the quantum of damages, you will need to issue an assignation au fond (writ commencing ordinary proceedings). The court can order the insurer to pay the full cost of repairs, compensate consequential losses, and apply statutory interest from the date of the mise en demeure.

Recovering costs, repairs, enforcement, and recoupment

Courts may order the insurer or the constructor to fund repairs directly, or they may award a monetary indemnity enabling you to commission the repairs yourself. If the defendant does not comply voluntarily, you can enforce the judgment through a huissier de justice (bailiff), including seizure of assets. Where a DO insurer has pre-financed repairs, it exercises its subrogation rights to recover costs from the constructor’s décennale insurer, the property owner does not bear the burden of this recoupment.

Practical Templates and Downloadable Pack

To streamline your claim, the following templates and checklists are designed for immediate use:

• Insurer notification email template (as reproduced above, adaptable to any décennale insurer)
• Lettre recommandée (LRAR) template, lettre type garantie décennale for postal submission
• Mise en demeure template, formal demand letter addressed to the constructor
• Expertise appointment preparation checklist, site access, evidence pack, witness coordination
• Assurance dommages-ouvrage claim template, notification to your DO insurer
• Sample “annexe photos” format, labelled photo log with dates and descriptions

For personalised assistance or to discuss the specifics of your decennial warranty claim in France, contact a France construction lawyer through the Global Law Experts lawyer directory.

Quick Reference for English Speakers, Key French Legal Terms

If you are an English speaker navigating this process for the first time, the following bilingual reference will help you communicate with insurers, experts, and legal professionals:

• Lettre recommandée avec accusé de réception (LRAR), Registered letter with return receipt (proof of delivery)
• Mise en demeure, Formal demand / notice to perform
• Réception des travaux, Formal acceptance of completed works (starts the 10-year clock)
• Expertise contradictoire, Adversarial expert assessment (both parties present)
• Référé-expertise, Emergency court-ordered expert assessment
• Procès-verbal (PV), Official written record / minutes
• Attestation d’assurance décennale, Certificate of decennial insurance
• Assignation au fond, Writ commencing full court proceedings

Conclusion, How to Claim Garantie Décennale France Online and When to Get Legal Help

Understanding how to claim garantie décennale in France online does not need to be an opaque or overwhelming process. Secure your evidence immediately, identify and notify the correct insurer by email and LRAR, prepare thoroughly for the expertise, and respect the strict ten-year limitation period running from the réception des travaux. Use the templates and checklists in this guide to organise your claim file and submit it through the insurer’s online portal. If the insurer delays or refuses your claim, escalate promptly, first with a mise en demeure, then through the courts.

For any decennial warranty claim in France that involves complex defects, disputed causation, or uncooperative insurers, engaging a specialist construction lawyer early in the process is the most effective way to protect your rights and maximise your recovery.

Sources

1. Service-Public, Garantie décennale
2. Legifrance, French Civil Code (Article 1792 et seq.)
3. SMABTP, Assurance décennale guidance
4. Capifrance, Garantie décennale and assurance dommages-ouvrage practical guide
5. Village de la Justice, Garantie décennale jurisprudence update
6. Index-Habitation, Consumer procedural guide
7. APRIL Pro, Administrative memo on garantie décennale