Décennale Insurance in France
A homeowner’s guide
Décennale Insurance in France:
A Homeowner's Guide
If you are having construction work done on a property in France — whether a new build, a renovation, or a structural extension — you will almost certainly encounter the term assurance décennale. Understanding what this insurance is, how it protects you, and what to do when things go wrong is essential for any homeowner navigating the French building sector.
What is Décennale Insurance, and why does it matter?
Décennale insurance is a form of compulsory construction liability insurance governed by the Spinetta Law of 4 January 1978 (Loi n°78-12), which fundamentally reformed construction liability in France. Under this legislation, any professional involved in construction work — builders, architects, engineers, roofers, plumbers, electricians, and other tradespeople — is legally required to hold décennale insurance before beginning any project.
The name comes from the French word for “ten years.” Once construction work is completed and formally received (réception des travaux), the contractor remains liable for any damage affecting the structural integrity or habitability of the building for a period of ten years. The insurance policy covers that liability.
The rationale is straightforward: serious defects in construction often take years to become apparent. Subsidence, water infiltration through a faulty roof, or a cracked load-bearing wall may not manifest until long after a contractor has moved on. Décennale insurance ensures that when such problems emerge, there is a financially solvent party — the insurer — to fund the repairs, regardless of whether the original contractor is still in business.
What is covered?
Décennale insurance covers damage that compromises the structural solidity of the building or renders it unfit for its intended purpose. In practice, this includes:
- Cracking or collapse of load-bearing walls, foundations, or structural frames
- Roof failures leading to water infiltration affecting the structure
- Defects in waterproofing that cause penetrating damp
- Failures of essential equipment incorporated into the building, such as central heating systems, lifts, or plumbing that is embedded in the structure
The coverage applies to the completed work and any damage it causes to pre-existing parts of the building.
What is not covered is equally important to understand. Décennale insurance does not cover:
- Cosmetic or aesthetic defects (cracks in plaster that do not affect structure, for instance)
- Normal wear and tear
- Damage caused by the homeowner’s own misuse or lack of maintenance
- Work carried out without a formal contract or by uninsured individuals
Separate guarantees exist for shorter periods. The garantie de parfait achèvement (one year) covers all defects reported at handover, and the garantie biennale (two years) covers non-structural equipment such as shutters, door handles, and fitted appliances.
How to verify that your contractor is insured
Never assume a contractor holds valid décennale insurance. Before signing any contract, ask for a copy of their attestation d’assurance décennale — the insurance certificate. This document must be current and must clearly state:
- The name and SIRET number of the insured company
- The insurer’s name
- The types of work covered (trades are specified individually)
- The policy period, which must be valid at the time the work begins
Cross-check the SIRET number against the French business register at annuaire-entreprises.data.gouv.fr to confirm the company exists and is active.
Contractors are also required to include their insurance details in any quote or contract they provide to you.
What to do if problems arise after work is completed
If you discover a defect that may fall under the décennale guarantee, act promptly and follow a clear process:
- Document everything. Take dated photographs of the damage and keep all written records related to the construction work: contracts, quotes, invoices, and handover documents.
- Contact the contractor in writing. Send a formal letter by recorded post (lettre recommandée avec accusé de réception), describing the defect and requesting repair. This creates a legal paper trail.
- Notify your own insurer. If you have a dommages-ouvrage (DO) policy — a form of insurance taken out by the homeowner before work begins — notify them at the same time. The DO policy is designed to fund repairs quickly without waiting for liability to be established, and it will then seek reimbursement from the contractor’s décennale insurer. DO insurance is compulsory for major works under the Spinetta Law, though it is frequently overlooked.
- Seek expert assessment if needed. If the contractor disputes the claim, you may request an independent expert (expert en bâtiment). This report can be used as evidence in negotiations or legal proceedings.
- Take legal action if necessary. If the matter cannot be resolved, you may bring a claim before the tribunal judiciaire. Given the technical nature of construction disputes, professional legal advice from a avocat spécialisé en droit de la construction is strongly recommended.
Your rights as a homeowner
French law is explicit in protecting homeowners in construction matters:
- You have the right to demand proof of décennale insurance before work begins, and refusing to provide it is a red flag that should give you pause before proceeding.
- You have ten years from the date of formal handover (réception des travaux) to bring a claim for covered defects, even if the contractor has since changed name, dissolved, or ceased trading — the insurer remains liable.
- If a contractor works without insurance, they remain personally liable for ten years, meaning you may pursue them directly through the courts.
- You are entitled to repairs, not merely financial compensation, if the defect falls within the scope of the guarantee.
A final word
Décennale insurance exists because construction defects can be devastating, expensive, and slow to reveal themselves. As a homeowner, the single most important step you can take before any significant building project is to verify that every professional you engage holds valid, appropriate cover — and to take out your own dommages-ouvrage policy where required. These protections are not bureaucratic formalities; they are the foundation of a secure investment in your property.
