Ten-year structural cover and DIY work: where does your liability end?

You reroofed your house yourself, insulated the loft at weekends, or put up a flat-pack conservatory with a friend: what happens if, later on, a serious defect appears? This article is for keen DIYers who want to understand where their legal protection ends and where their personal liability begins.

The principle: a private individual is not a "constructor"

Article 1792 of the French Civil Code targets "constructors": firms, architects, project managers, subcontractors. A private individual who carries out work for their own use does not fall into that category.

The direct consequences:

• No obligation to take out ten-year cover
• No presumption of ten-year liability on work you do at your own home
• No criminal penalty tied to the absence of professional insurance

This principle is logical: ten-year structural cover was created to protect consumers against professionals. A private individual doing DIY at home bears the consequences of their own choices alone.

But what can go wrong?

Three main risk areas to know about before taking on major work.

Risk 1: selling the property within 10 years

This is the main trap. If you sell your home less than 10 years after carrying out substantial work yourself, case law may treat you as a "non-building constructor" (constructeur non réalisateur) or a "seller after construction".

On that basis, the buyer may, within the 10 years following completion of the work:

• Engage your personal ten-year liability
• Demand the repair of serious defects that have appeared in your work
• Pursue you in the civil courts against your personal assets

And you have no insurance to defend yourself.

Risk 2: damage caused to a neighbour

If your work causes harm to a third party (a neighbour, an adjoining property, a fellow co-owner), your civil liability may be engaged on the basis of:

• Article 1240 of the French Civil Code (liability for fault)
• Abnormal neighbourhood nuisance (troubles anormaux de voisinage)
• Your home insurance (which may step in, subject to the limits of your policy)

Always check that your comprehensive home insurance covers work in progress and its consequences for third parties. For larger projects, some insurers offer an optional "self-build" (auto-construction) guarantee.

Risk 3: losing commercial warranties

Many construction materials and equipment are sold with a manufacturer's warranty, which can run from 1 to 30 years. But this warranty is generally conditional on installation carried out to professional standards, or even on installation by a certified professional.

By carrying out the installation yourself, you may:

• Void the manufacturer's warranty
• Be refused a free replacement in the event of a failure
• Lose access to certain public grants (energy-saving certificates, MaPrimeRénov', etc.), which require work to be done by a certified professional (RGE)

Which types of work count as DIY, and which call for a professional?

The line is not always obvious. A few pointers:

Work you can reasonably carry out yourself

• Interior painting
• Laying removable floor coverings (floating parquet, click vinyl)
• Replacing removable equipment (unfixed radiators, electrical sockets)
• Assembling furniture
• Fitting insect screens, interior blinds
• Garden landscaping (excluding earthworks)

Work that must be entrusted to a professional

• Structural alterations (load-bearing walls, roof framing)
• Structural work (foundations, slabs, walls)
• Roofing and waterproofing
• Concealed electrics (safety + home insurance)
• Complex plumbing (concealed pipework, connections)
• Heating (boilers, heat pumps, underfloor heating)
• External wall insulation (ITE)
• Building a conservatory or extension (planning permission, thermal standards)

For these projects, the added value of a professional goes beyond the quality of execution: it includes ten-year structural cover, compliance with standards, and traceability for resale.

The special case of "kits" and self-building

Self-building (a kit house, timber frame, shipping container) is legally more complex. In that case you are considered to be both the client (maître d'ouvrage) and the constructor.

Several points to be aware of:

1. You remain exposed to ten-year liability if you sell within 10 years
2. Planning permission is compulsory above certain thresholds (often 20 m² of floor area created)
3. Compliance with standards (RE2020 thermal regulations, NF C 15-100 electrical standards, etc.) remains mandatory
4. Structural damage (dommage-ouvrage) cover is legally compulsory if you build a dwelling, but is often overlooked — and it will be a sticking point on resale

The good habits of a savvy DIYer

To limit the risks, a few best practices:

1. Document your work: before/during/after photos, material invoices, plans
2. Keep the technical manuals and warranties for the materials and equipment installed
3. Have high-risk installations checked by a professional (e.g. CONSUEL certification for electrics)
4. Check your home insurance for work in progress
5. On resale, mention the work in the deed and have the warranty position framed by the notaire
6. For major work, get support from an architect or project manager

And if I work for a relative, free of charge?

Are you giving your brother or a friend a hand? As long as it stays voluntary, occasional and unpaid, you are not considered a professional constructor. No ten-year insurance obligation.

But beware:

• In the event of damage caused to a third party during that work, your civil liability may come into play
• If the help becomes regular and paid, you cross over into undeclared work, with a serious criminal risk
• The person the work is done for will not be able to rely on any ten-year cover if a defect appears

For substantial work, even between relatives, bringing in a professional remains the soundest option.

In summary

• A private individual doing DIY at home is not a "constructor": no compulsory ten-year cover
• But if you sell within 10 years, you can be held liable for defects
• Check your home insurance for work in progress
• For major work (structure, waterproofing, heating, electrics), calling in a professional remains far preferable
• If you are unsure where the line lies, seek advice before you start

Need guidance?

Are you a homeowner preparing for substantial work, or considering a sale close to the end of the ten-year period? Our team of brokers can advise you on which guarantees to draw on and which risks to anticipate. Request a personalised quote or get in touch with an adviser.