What to check before buying property in France. Before you commit capital, read the property.
International buyers in France face risks that standard diagnostics do not cover — unauthorized works, heritage constraints, planning violations. Discovering them before you sign protects your capital and your leverage.
The French system does not protect you the way you think it does.
UK and US buyers arrive expecting a system similar to what they know — comprehensive surveys, clear permitted development rights, transparent planning histories.
The mandatory French diagnostic package (DDT) checks for asbestos, lead, termites, energy performance and electrical safety. It does not assess structural integrity, foundations, roof condition or planning compliance. It does not tell you whether the previous owner built an unauthorized extension. It does not tell you whether the property is subject to ABF heritage constraints that will limit what you can do with it.
By the time most buyers discover these issues, they have already signed the compromis. At that point, withdrawing is expensive, contested and slow.
Five risks that standard French diagnostics leave uncovered.
1 — Unauthorized works by previous owners
Extensions, pools, terraces built without planning permission become your legal liability the moment you sign. The Mairie can order demolition at your expense. Discovering this before the compromis gives you formal leverage to renegotiate the price or withdraw without penalty.
2 — ABF heritage constraints you cannot see
Many properties on the Côte d’Azur fall within the protected perimeter of a Monument Historique or a Site Patrimonial Remarquable. Any transformation — including repainting shutters or replacing windows — requires approval from the Architecte des Bâtiments de France. This is not visible in the estate agent’s listing. It is not covered by the DDT.
3 — PLU restrictions on extension and use
The local planning scheme (PLU) defines exactly what can be built, how high, how close to boundaries, and in what materials. A villa that looks straightforward to extend may sit in a protected natural zone where additional footprint is prohibited. Understanding the real building rights before you buy is the difference between an asset and a constraint.
4 — Structural risks the DDT does not assess
Standard French diagnostics do not cover roof structure, load-bearing walls, foundations or moisture barriers. Regional risks — clay soil subsidence, mérule dry rot, non-breathable modern finishes over traditional stone walls — are invisible in the mandatory reports.
5 — The notaire represents the state, not you
French notaires are public officials who guarantee the legal validity of the transaction for the state. They do not represent your interests as a buyer. Using the seller’s notaire means you have no independent professional protecting your position.
The clause suspensive — your most powerful tool before signing.
Before signing the compromis de vente, you can insert a clause suspensive — a contractual condition that makes the sale subject to a satisfactory independent assessment. If the assessment reveals a planning violation, an unauthorized structure, or a major structural issue, you can withdraw without losing your deposit.
Most buyers do not know this clause exists. Most estate agents do not mention it. And most sellers will not volunteer the information.
A French-registered architect produces the documented assessment that gives this clause its legal weight.
What our pre-purchase assessment covers.
- Real building rights under the local PLU — what can actually be built, extended or modified
- Heritage and ABF constraints — whether the property falls within a protection perimeter — Planning compliance — identifying unauthorized works by previous owners
- Structural and technical condition — reading the building fabric and its risks
- Economic coherence — whether your transformation is financially viable
- Go / no-go position — a documented recommendation before you sign
Produced by a French-registered architect with full legal standing and professional indemnity cover under French law. Not a generic survey — a strategic decision tool.
Frequently asked questions
Can I make the purchase conditional on an architectural assessment?
Yes. A clause suspensive can be inserted into the compromis de vente making the sale conditional on a satisfactory assessment. If significant issues are found — unauthorized works, heritage constraints, structural problems — you can withdraw without penalty. A French-registered architect produces the documented assessment that gives this clause its legal validity.
What is the difference between a French DDT and a building survey?
The DDT checks for specific hazards — asbestos, lead, termites, electrical safety, gas and energy performance. It does not assess structural integrity, foundations, roof condition or planning compliance. A pre-purchase architectural assessment covers exactly what the DDT leaves out.
Do I need a French architect or can a RICS surveyor assess the property?
A RICS surveyor can assess physical condition. Only a French-registered architect has the legal standing to formally assess building rights under the PLU, evaluate heritage protection perimeters, and produce a report with professional indemnity cover under French law. For planning and regulatory risk — where the most significant financial exposure lies — a French-registered architect is the correct professional.
What happens if I discover unauthorized works after signing?
Once the acte de vente is signed, unauthorized works become your legal liability. The Mairie can order demolition at your expense. Pursuing the seller through vices cachés law is possible but expensive and slow. Discovering the issue before the compromis is the only reliable protection.
How much does a pre-purchase assessment cost?
Our Step Zero pre-purchase assessment is priced between €3,500 and €7,000 excl. VAT depending on the complexity of the property. For an acquisition in the €1M+ range, this represents a fraction of the capital at risk — and can be used as direct leverage in price negotiation if issues are identified.
Your acquisition deserves a careful reading before any commitment.
We work with international buyers across the Côte d’Azur and PACA — from Hyères and Saint-Paul-de-Vence to Villefranche-sur-Mer and Roquebrune-Cap-Martin. Every engagement begins with a conversation — no commitment required.
Franco-Italian studio based in Grasse · French-registered architect · CasaClima certification · Dual registration with French and Italian professional orders · English spoken · Published in Journal des Palaces · Wine Industry Advisor
