Do You Need a Structural Survey When Buying a House in France?

Almost every British buyer I work with asks the same question. “Where’s the survey?” In France, the file that lands in your inbox is the DDT. It’s thick, technical, in French and full of official stamps. It looks like a survey. It isn’t one, and that misunderstanding is one of the more expensive mistakes a foreign buyer can make.

What is the DDT, and what does it actually contain?

The DDT is a bundle of separate reports, each triggered by a specific condition. The seller pays for it and must annex it to the promesse or compromis de vente, or failing that to the final deed. The legal basis is article L271-4 of the French Construction and Housing Code.

Each report has its own trigger and its own shelf life. For a house, the list looks like this :

A few details matter more than they appear to.

The DPE is legally enforceable. Since July 2021 the buyer can rely on the rating; the recommendations remain informative. On 1 January 2026 the electricity conversion factor fell from 2.3 to 1.9, lifting many electrically heated homes by a class. Older certificates stay valid and can be updated free through the ADEME observatory. More in our guide to the French energy performance certificate.

The risk report must reach you early. Since January 2023 the ERP must be handed over at the first viewing, and the seller can fill it in themselves with the government’s Errial tool.

A non-compliant septic system has a deadline. If the SPANC report finds the system non-compliant, the buyer has one year from the sale to bring it into compliance. That’s a cost to price into your offer, not a footnote.

Why does the DDT exist, and who is it really protecting?

The DDT exists to inform the buyer about specific health, safety and environmental risks. It also protects the seller.

Most French sale contracts contain a clause excluding the seller’s liability for hidden defects (vices cachés). That clause holds, unless the seller is a professional or the buyer proves the seller knew about the defect. If a required diagnostic is missing, the seller loses the benefit of that clause for the defect the report should have covered. For the risk report, the sanction can go as far as cancelling the sale or reducing the price.

Read that the other way round. Once a complete DDT and the exclusion clause are in the contract, your room to complain after completion shrinks. You would have two years from discovering the defect to act, and you’d need to prove the seller knew. That’s hard. The DDT shifts information to you, and responsibility comes with it.

What doesn’t the DDT tell you?

Diagnosticians are certified for defined missions and stick to them. Inspections are largely visual and non-destructive: no lifted floorboards, no opened walls, no climbing onto roofs. What typically falls outside the DDT:

• Structure. Cracks, subsidence, bowing walls, movement on a slope, failed lintels. No report in the DDT assesses structural soundness.
• Roof condition. The state of the covering, the timbers, the flashings and the gutters. The termite report may note insect damage in accessible timber, nothing more.
• Damp. Rising damp, condensation and water ingress aren’t assessed. The mérule report is only an information obligation, in designated zones.
• Costs. The electrical report lists anomalies. It doesn’t tell you whether the fix is €400 or a full rewire.
• Heating, plumbing and hot water beyond the gas safety check, and beyond what the energy audit models.
• Outbuildings, pools, wells, retaining walls and boundaries.
• Planning and alterations. Whether that converted barn had permission is a question for the notaire and the mairie, not the diagnostician.

The DDT answers the question “is this property compliant and safe on the regulated points?” A survey answers a different question: “what condition is this building in, and what will it cost me?”

DDT vs survey: what is the difference?

The two documents don’t compete. They answer different questions. The mistake is to treat one as a substitute for the other.

Is a survey legally required when buying in France?

No. Nothing in French law requires the buyer to commission a survey, and there’s no French equivalent of the RICS Home Survey levels you may know from the UK. Lenders in France don’t normally require one either.

Here is the line between what the law demands and what I advise.

Legal requirement

• The seller must supply a complete, in-date DDT, annexed to the promesse or compromis.
• The risk report must be given at the first viewing.
• Non-professional buyers of a home have a 10-day cooling-off period after signing the compromis, starting the day after it’s notified to them.
• A non-compliant septic system must be brought up to standard within one year of the sale.

FPE recommendation

• Read the whole DDT before making an offer, not after. Ask the agent for it at the first viewing.
• Commission an independent inspection for any property built before around 1950, any rural or stone building, any house with visible cracking, damp or recent cosmetic renovation, any property on sloping or clay ground, and any purchase where the roof is older than you are.
• Get quotes for anything the DDT flags as non-compliant (septic system, electrics, asbestos removal) before agreeing a price.
• Never rely on an energy audit as a structural assessment. It isn’t one.

The recommendation is mine, not the law’s. It comes from what I’ve seen go wrong.

Who can carry out a survey in France?

The profession isn’t organised as it is in the UK. You choose the professional according to the question you need answered.

• A building expert (expert en bâtiment). The closest thing to a general condition survey. The title isn’t regulated, so check experience, professional insurance and a sample report.
• An architect. A regulated profession. Useful if you’re planning works or a conversion: they tell you what’s feasible as well as what’s wrong.
• A structural engineer (bureau d’études structure). The right call for serious cracking, movement, a slope or a doubtful retaining wall.
• A specialist tradesperson. A roofer, electrician or septic installer quoting on the problems the DDT raised. Not independent, but useful for costing.
• English-speaking surveyors in France. They exist, mostly where British buyers cluster. Make sure they know French construction, especially old stone and lime.

Whoever you choose, agree the scope in writing, ask for photographs, and get the report in a language you can act on.

When should you commission a survey, and how does it fit the timeline?

Timing matters more than the choice of surveyor. A report that arrives after your cooling-off period has expired is information, not protection.

There are three realistic windows:

1. Before making an offer. The cleanest option. You negotiate with facts in hand, at the risk of paying for a house you don’t buy.
2. After the offer is accepted, before the compromis. The most common route. Don’t let anyone rush the compromis before your report is back.
3. During the 10-day cooling-off period. Possible but tight, especially in August or in a rural area.

A fourth route is less known. Parties are free to agree suspensive conditions and their deadlines; only the mortgage condition has a legal minimum of one month. A condition tied to a satisfactory structural inspection is legally possible. It isn’t customary, sellers may resist, and the notaire must draft it precisely. But it can be negotiated.

How do I check a DDT myself?

This is the method I apply to every DDT a client sends me. Most of it takes an hour.

1. Check dates against your signing date. Validity is judged at the promesse. A five-month-old termite report or ERP will have expired by the time the notaire drafts the contract.

2. Check the diagnostician. Enter the certification number printed on each report in the government directory of certified diagnosticians. Confirm it covered that domain on the date of the visit.

3. Check the DPE with ADEME. Look up its 13-character ADEME number on the ADEME observatory. Address, surface and rating should match. With electric heating, check whether the January 2026 calculation applies.

4. Rerun the risk report. Enter the address in Géorisques yourself and read beyond the summary: landslide, clay shrink-swell, flooding, radon, past disaster claims.

5. Compare the DDT with the listing. Surfaces, rooms, heating, drainage, year of construction. Each discrepancy is a question for the agent, sometimes a negotiating point.

6. Read the anomalies and the reservations. Note which electrical and gas anomalies are marked as dangerous. In the asbestos and termite reports, find the areas the diagnostician couldn’t access. An inaccessible roof space is a gap, not a clean bill of health.

7. List what the DDT doesn’t cover for this house. Roof, structure, damp, outbuildings, pool, boundaries. That list is your brief for an independent inspection.

What does this look like on a real purchase?

Two recent cases, anonymised, show the two most common traps.

A chalet-style house in the Ariège, summer 2026. A British client sent me the DDT and the septic report on a house with a pool, land and mountain views. The file was far from empty. It showed a non-compliant septic system with works required within a year, electrical and gas anomalies, asbestos materials, a fifty-year-old oil boiler and a DPE rated E. The risk report placed parts of the area in landslide and runoff zones, with clay ground as well.

The DDT did its job: it flagged hazards. It didn’t put a price on any of them, or say how a house on a slope in a landslide zone was actually behaving. Nor did it point out where the listing and the documents disagreed. My report separated the legal obligation (the septic works) from the points needing a specialist (ground and structure), costed what could be costed and turned the rest into a negotiation strategy. He went into the discussion informed, not alarmed.

A townhouse on the Normandy coast, July 2026. A couple received an audit énergétique, the mandatory energy audit for houses rated E, F or G. Long, detailed, with renovation scenarios and costs. They read it as a survey. It says nothing about structure, and nothing about damp in the walls below ground level, a real concern for that house. Once we separated essential works from optional ones and set the structural questions apart, the picture changed. They decided the project wasn’t for them. A good outcome too: they walked away before signing, not after.

So, do you need a survey on top of the DDT?

Not always. For a recent house or a well-kept flat, a careful reading of the DDT, the copropriété documents and a thorough viewing will often do.

For the properties most British buyers fall for, the answer changes. Old stone, rural locations, roofs of unknown age, previous owners’ DIY, houses on slopes: this is where the DDT is silent and repair bills are highest. An inspection costs little next to a new roof, or next to the negotiating margin it can give you.

The DDT tells you what the seller must disclose. A survey tells you what you’re buying. Know both before you sign.

If you’d like a second pair of eyes on a DDT, in English, that’s part of Your French Property Partner. It starts with a free 30-minute discovery call. I’m not an agent and I take no commission on the sale.

Frequently asked questions

Is the DDT the same as a survey?

No. The DDT is a set of mandatory reports on specific regulated items: asbestos, lead, electrics, gas, termites, energy performance, drainage and natural risks. It doesn’t assess structure, roof condition or damp, and it doesn’t estimate repair costs. A survey is an optional inspection you commission to assess the building’s overall condition.

Can I rely on the DDT if a problem appears after I buy?

Only partly. If a required report was missing, the seller can’t rely on the usual clause excluding liability for hidden defects for that item. If the DDT was complete, you would generally need to prove the seller knew about the defect. You have two years from discovering it to act. That’s why checking before signing matters.

Is the French energy audit a structural survey?

No. The audit énergétique, required when selling a house rated E, F or G, models energy performance and proposes renovation scenarios with costs. It doesn’t assess structure, damp or roof condition, however detailed it looks.

Can I make the purchase conditional on a satisfactory survey?

Legally, yes. Parties are free to agree suspensive conditions and their deadlines, except for the mortgage condition, which has a minimum of one month. In practice it isn’t customary, so expect resistance, and have the notaire draft the condition precisely.

How long are French property diagnostics valid?

It depends on the report: six months for termites and the risk report, three years for electricity, gas and the septic report, ten years for the DPE, five years for the energy audit, and unlimited for asbestos and lead when none is found. Validity is judged at the date of the promesse or compromis.