Decennial Guarantee and Latent Defects: When Must the Manufacturer Pay for Construction Defects?

Imagine you are the owner of a house in Mimizan, built a few years ago. You hired a local builder, everything seemed perfect at delivery. But after five years, insulation problems appear: thermal bridges, dampness, soaring heating bills. Who should pay? The builder? The manufacturer of the insulation panels? Your insurance?

I encounter this situation regularly in my practice in the jurisdiction of Mont-de-Marsan. Owners in Parentis-en-Born, Mimizan, or Mont-de-Marsan itself often find themselves helpless when construction defects appear years later. They paid for a new house, and now they have to undertake costly works.

The decision we analyse today provides a clear answer to this thorny question. It specifically concerns the liability of the manufacturer of defective materials when the builder has already been ordered to compensate the owner. But what does this change in practice for you?

The facts: a story as it happens every day

Take the example of Mr and Mrs Martin, owners in Mimizan. They had their house built in 2005 by a local construction company, Bâtiments Landes. For insulation, the builder used isothermal panels manufactured by the company Plasteurop. Everything seemed perfect at the handover of the works.

But in 2008, three years after moving in, problems begin: damp marks appear on the walls, the heating bill is abnormally high. An expert appointed by the Martins finds that the insulation panels are defective - they have a latent defect (a defect not apparent at delivery that renders the thing unfit for its intended purpose).

The Martins then sue the builder, Bâtiments Landes, before the court. They invoke the decennial guarantee (a statutory 10-year guarantee covering damage compromising the stability of the structure or rendering it unfit for its purpose). The court rules in favour of the Martins and orders Bâtiments Landes to pay €25,000 in damages for repair works.

But the story does not end there. Bâtiments Landes, which had to compensate the Martins, turns against the manufacturer of the panels, Plasteurop. The Landes company believes that it is the manufacturer who is at the origin of the problem, since it was its panels that were defective. It therefore sues Plasteurop to obtain reimbursement of the €25,000 it had to pay to the Martins.

Plasteurop and its insurers resist: they invoke a clause in their contract that would exclude the guarantee for latent defects. The manufacturer believes it does not have to compensate Bâtiments Landes, since the latter was ordered to pay on the basis of the decennial guarantee, and not on that of latent defects. This is where the judges will decide.

The court's reasoning - dissected

The Court of Cassation, in its judgment of 8 June 2011, provides a clear answer to this dispute. The judges first recall a fundamental principle: persons strictly liable (i.e., automatically liable, without needing to prove their fault) under Articles 1792 et seq. of the Civil Code are not subrogated (they do not substitute themselves) after payment to the benefit of the action reserved to the client (the owner who commissioned the works) and to subsequent owners.

In plain terms, when a builder like Bâtiments Landes compensates an owner on the basis of the decennial guarantee, it does not automatically become the owner in place of the latter. It cannot therefore claim the same rights as the original owner against other liable parties.

But be careful however: the Court specifies that this builder can still take action against other parties liable with it on the same basis, but on the basis of general liability (the general rules of liability that apply to everyone). In other words, Bâtiments Landes cannot turn against Plasteurop by invoking the decennial guarantee, but it can do so by invoking the guarantee for latent defects under Articles 1641 et seq. of the Civil Code.

The Court then analyses the concrete situation: Bâtiments Landes was ordered to compensate the Martins because Plasteurop's panels were defective. These defects indeed constitute latent defects within the meaning of Article 1641 of the Civil Code (which obliges the seller to guarantee the thing against latent defects that render it unfit for the use for which it is intended).

Plasteurop invoked a clause excluding the guarantee for latent defects in its contract. But the Court recalls an essential principle: for this clause to be valid, the buyer (here Bâtiments Landes) must have had knowledge of the latent defect at the time of sale. Now, in this case, Plasteurop did not provide proof that Bâtiments Landes knew of the defect in the panels.

What few people know: this decision confirms consistent case law. It is not revolutionary, but it forcefully recalls essential principles. undefined, I have encountered cases where manufacturers tried to evade their responsibilities by invoking unfair clauses. This decision reminds them that they cannot exclude everything.

What this changes for you - concretely

But what exactly does this change for you, an owner in Parentis-en-Born or elsewhere in the Landes? Let's take concrete examples by profile.

If you are a landlord (you rent out your property): this decision protects you doubly. First, you can take action against the builder on the basis of the decennial guarantee for 10 years from the handover of the works. Secondly, if the builder goes bankrupt or disappears, you may be able to turn against the manufacturer of the defective materials. Imagine: you had a house built in Parentis-en-Born in 2015, and in 2023 you discover waterproofing problems due to defective windows. The builder has gone out of business. Thanks to this case law, you may be able to take direct action against the window manufacturer.

If you are a purchaser of a new property: you benefit from the same protections. But be careful: the time limits are short. The decennial guarantee runs for 10 years from handover. The guarantee for latent defects, however, is subject to a limitation period of 2 years from discovery of the defect. undefined, I see too many owners who wait too long before taking action.

If you are a construction professional: this decision has important implications. First, it reminds you that you are jointly and severally liable with the manufacturer of the materials you use. Secondly, it gives you a recourse against this manufacturer if its products are defective. But for this recourse to succeed, you must act quickly and keep all evidence: invoices, delivery notes, correspondence with the manufacturer.

Realistic numerical example: for a 150m² house in Mimizan, insulation problems can lead to works costing €15,000 to €30,000. If the builder covers them, so much the better. But if it turns against the manufacturer, as in our case, and the latter ultimately has to pay, the entire chain of liability functions.

Four tips to avoid this type of dispute

• Keep all your documents: invoices, contracts, plans, technical manuals, correspondence with professionals. In a case I recently handled, a simple dated invoice allowed a manufacturer to be held liable.
• Have any defect promptly recorded: as soon as a problem appears, call in an independent expert. Do not wait for the situation to worsen. The limitation period (the time limit after which you can no longer take legal action) can work against you.
• Check the clauses in your contracts: when you buy materials or have works carried out, read the clauses on guarantees carefully. A clause that totally excludes the guarantee for latent defects may be unfair.
• Take action primarily against the builder: they are your direct contact. It is up to them to then turn against their suppliers. Do not waste time trying to contact the manufacturer directly, unless the builder has disappeared.

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Deep dive: related case law and developments

This decision is part of consistent case law from the Court of Cassation. Already in 2006, in a judgment of 7 November (No. 05-10.305), the Court had recalled that a builder ordered to pay on the basis of the decennial guarantee could turn against the manufacturer on the basis of the guarantee for latent defects.

But there have been developments. Notably, the Court has clarified in more recent decisions the conditions under which a manufacturer could invoke a limitation of liability clause. For this clause to be valid, not only must the buyer have had knowledge of the defect, but the clause must also be clear and understandable.

The trend of the courts is clear: they increasingly protect consumers and professionals acting in good faith against unfair clauses. In the jurisdiction of Mont-de-Marsan, I observe that judges apply these principles strictly. They scrupulously check whether the clauses were brought to the attention of the parties and whether they are fair.

For the future, this case law should strengthen. With the evolution of construction materials and environmental issues, disputes concerning construction defects will probably increase. Manufacturers will have to be increasingly vigilant about the quality of their products.

In practice: what to do

Here is a checklist of what to do if you are faced with a similar situation:

1. Identify the defect precisely: note the date of appearance, take photos, describe the symptoms.
2. Contact the builder by registered letter: describe the problem, request repair within 15 days, mention the decennial guarantee.
3. Appoint an expert if necessary: if the builder does not react, call in a construction expert to record the defect.
4. Consult a specialised lawyer: before starting proceedings, assess your rights and the time limits.
5. Keep all evidence: keep a copy of all documents, including exchanges with the builder and manufacturer.

Do you find yourself in a similar situation? A first 30-minute consultation with Maître Zakine (€45) can save you months of proceedings - and often much more. Book an appointment →