Disclaimer: This article is for informational purposes only and does not constitute legal, tax, or financial advice. French property law is complex and varies by situation. Always consult a qualified French notaire or avocat before making decisions based on this content.
You’ve just bought a lovely stone cottage in the Loire Valley, or perhaps a rural plot in Provence. You walk the boundaries on a sunny afternoon and think: This is perfect. Then you notice something odd. Your neighbor’s field seems to extend slightly further than your cadastral plan suggests. Or there’s a fence that doesn’t quite line up with your title deed. Welcome to the murky world of French boundary disputes — litiges de bornage — where decades of neighborly tolerance, vague old deeds, and the French legal concept of adverse possession (prescription acquisitive) can quietly rewrite the map of your property.
For British property owners in France, boundary disputes are far more than academic quirks. They’re the single most common modern application of adverse possession law. If you’re holding rural land, a holiday home, or agricultural property, understanding how French law handles boundaries — and how a neighbor’s 30-year occupation can legally shift them — is essential. This guide cuts through the jargon and shows you what you need to know.
How French Property Boundaries Work
Here’s the surprise that catches many British owners off guard: France has a cadastre, but it’s not what you think it is.
The French cadastre (cadastral register) is essentially a fiscal map maintained by the government. It’s been available online since 2008 at cadastre.gouv.fr — which is brilliant for quick reference. But the cadastre is a tool for tax assessment and land records, not a legal guarantee of your boundaries. It shows approximate areas of properties, historical plot divisions, and registered changes of ownership. It does not establish where your land actually ends and your neighbor’s begins.
So where does your legal boundary come from? There are three sources (source: Service-Public.fr, Bornage de terrains):
- Your titre de propriété (title deed). This document, drawn up by a notaire when you bought the property, should describe the property’s location, dimensions, and any boundaries. But here’s the catch: old deeds — especially rural ones — are often vague. You might see something like “a plot at the foot of the hill, measuring approximately 2 hectares, bounded by the stream to the north and the road to the south.” Approximately. The word every boundary lawyer learns to dread.
- A formal boundary survey (bornage). This is the professional approach. A géomètre-expert (licensed land surveyor) physically marks out your boundaries and places bornes (physical boundary markers, usually concrete posts). This creates a binding record.
- Prescription acquisitive (adverse possession). If your neighbor has occupied part of your land for 30 years under specific legal conditions, they can claim ownership. We’ll explore this in detail below.
The key point: the cadastre is a starting place, not a destination. If you have any doubt about your boundaries, you’ll need either a professional bornage or a formal legal decision.
The Bornage: Amicable or Judicial
A bornage (boundary demarcation) can happen in two ways:
Amiable bornage: You and your neighbor agree to commission a géomètre-expert to survey the boundary, place physical markers, and draft a procès-verbal de bornage (boundary report). This is amicable, usually costs €600–€3,000 depending on property size and complexity, and creates a clear legal record when registered at the service de publicité foncière (land registry). Most boundary disputes end here, civilly and quickly.
Judicial bornage (bornage judiciaire): If your neighbor refuses to participate, refuses to pay, or disputes the findings, you have a legal right. Article 646 of the Code civil states: “Every owner can compel their neighbor to the boundary demarcation of their contiguous properties. The demarcation is done at common expense.” You file for a bornage judiciaire at the tribunal judiciaire (district court), the court appoints a géomètre-expert, and the decision is binding. It’s more expensive (legal fees, court costs, and the expert’s bill) and takes longer, but it’s your guaranteed remedy.
How Adverse Possession Shifts Boundaries
This is the headline risk for British property owners: your neighbor can legally claim part of your land if they’ve occupied it continuously and peacefully for 30 years. It’s called prescription acquisitive (or prescription trentenaire — the 30-year rule), and it’s a bedrock principle of French property law.
The scenario is mundane: A farmer at the boundary of your rural plot gradually plows an extra strip year after year. A neighbor’s garden, enclosed by a fence that’s always been three meters into your land, remains fenced and cultivated for three decades. A boundary wall was built slightly over the legal line when neither owner was paying attention, and it stays that way for a generation. None of these are dramatic acts of trespass. They’re the slow, quiet encroachments that happen in the countryside.
After 30 years, the neighbor can invoke prescription acquisitive and claim legal ownership of the disputed strip. Here’s what makes this dangerous: prescription can override even a published title. A landmark decision by the Cour de Cassation (Civ. 3e, 17 Dec 2020, No. 18-24.434 (source: Dalloz, Rép. civ., V° Prescription acquisitive, para 29)) confirmed that prescription trentenaire can be opposed to a title — meaning even if you hold a clear deed, a neighbor’s 30-year possession can extinguish your ownership.
For this to work, the neighbor’s possession must meet five strict conditions (Article 2261, Code civil). The possession must be:
- Continuous and uninterrupted (continue et non interrompue): Not occasional or seasonal. A farmer who uses a strip of land for plowing every year, or a neighbor who maintains a garden over decades, counts. Someone who leaves the land alone for years and then returns does not. The possession must run without break for the full 30-year period.
- Peaceful (paisible): Without contest or force. If you object openly or take the neighbor to court early, peaceful possession is broken. But if you say nothing, their use is “peaceful.”
- Public (publique): Visible and obvious. An underground cellar secretly dug under a neighbor’s building? That’s the textbook example of not public. A fenced garden, a plowed field, a built structure — these are public. The neighbor’s activity must be something a reasonable observer would notice.
- Unequivocal (non équivoque): The possession must leave no doubt about the possessor’s intention to act as owner. If the circumstances are ambiguous — for instance, acts that could equally be explained by a lease, a loan, or simple tolerance — the possession is equivocal and cannot found prescription.
- As owner (à titre de propriétaire): The key phrase is “animus domini” — they must possess the land as though they own it, not as a tenant or licensee or tolerated user. If they act like an owner (maintain it, use it for their own benefit, treat it as their own), this element is met.
If all five are satisfied for 30 consecutive years, prescription acquisitive applies. The legal consequence is stark: the neighbor acquires ownership, and you lose it. In modern practice, prescription acquisitive mainly serves to delimit boundaries between neighboring plots (source: Dalloz, Rép. civ., V° Prescription acquisitive, para 1). It’s not a doctrine of reward for loyalty; it’s a practical mechanism to settle boundary ambiguity when a situation has persisted unchallenged for a generation.
One final detail: breach of urbanism regulations (bâtiments contrevenant aux règles d’urbanisme) does not prevent prescription. A neighbor who builds a small structure slightly over the line in a way that technically violates building codes can still acquire ownership by prescription if the 30-year conditions are met (Civ. 3e, 21 Sept 2022, No. 21-17.409 (source: Dalloz, Rép. civ., V° Prescription acquisitive, para 35)). The urban planning violation is a separate issue.
Shared Walls and Mitoyenneté
Many properties in rural France have shared walls (murs mitoyens) — a wall that belongs to both neighbors in equal shares, and both have equal rights and responsibilities for its upkeep. The legal concept is mitoyenneté (co-ownership of the wall).
Here’s where boundary disputes get tricky: a neighbor can acquire co-ownership (mitoyenneté) of your wall by prescription. If they build or lean structures against your wall for 30 years, they may acquire the right of mitoyenneté under prescription acquisitive. Two key cases illustrate the law:
- Civ. 1re, 10 May 1965 (source: Dalloz, Rép. civ., V° Mitoyenneté): Established that mitoyenneté can be acquired by prescription if a neighbor has constructed against a wall for the full 30-year period.
- Civ. 3e, 8 Dec 1971 (source: Dalloz, Rép. civ., V° Mitoyenneté): Confirmed that such prescription-based mitoyenneté is valid and binding.
But there’s a critical exception: encroachment (empiètement) prevents acquisition. The distinction is subtle but crucial. If a neighbor builds on your wall (using it as a support while building within their own boundary), that’s construction against the wall and mitoyenneté can be acquired. If they build over the boundary line into your land, that’s encroachment, and encroachment breaks the continuity and nature of possession — mitoyenneté cannot be acquired (Civ. 3e, 19 Sept 2007, No. 06-16.384 (source: Dalloz, Rép. civ., V° Mitoyenneté)).
Why does this matter? If you have a wall on your boundary with a neighbor, it’s worth clarifying whether it’s mur mitoyen (shared) or your exclusive property. If it’s exclusive to you, you control its use and modification. If a neighbor tries to claim mitoyenneté through prescription, you’d need to prove they encroached rather than merely leaning structures against it.
Servitudes Between Neighbors
A servitude (servitude) is a legal right one property has over another — for example, a right of way across a neighbor’s land, a right to drain water through their field, or a right to have eaves from your roof overhang slightly onto their property. Servitudes can be established by deed, by law (legal servitudes), or by prescription acquisitive.
Not all servitudes can be acquired by prescription. This is where the law gets selective. Article 690 of the Code civil states that only continuous AND apparent servitudes can be acquired by prescription.
Continuous (continue): The servitude operates without requiring human intervention. A constant drainage channel or aqueduct that flows downhill through your property is continuous. A water pipe buried underground is continuous. By contrast, a right of way (droit de passage) is discontinuous — someone has to actively walk across the land. Therefore, passage rights cannot be acquired by prescription, no matter how long they’ve been used.
Apparent (apparent): There must be visible, external signs of the servitude. A drainage channel with a visible outlet, an eaves that visibly overhang, a fence marking a boundary — these are apparent. A servitude hidden entirely underground with no surface signs is not apparent and cannot be acquired.
Examples: What Can and Cannot Be Prescribed
Servitudes that CAN be prescribed (continuous and apparent):
- Aqueducts or drainage channels with visible pipes running through a neighbor’s land (Civ. 3e, 17 June 2021, No. 20-19.968)
- Permanent openings or light windows (jours) in a shared wall that have remained open for 30 years (Civ. 3e, 1 Feb 2018, No. 16-27.532)
- Overhanging structures (surplomb) — eaves, balconies, or guttering that visibly project over a neighbor’s land
- Visible drainage works with permanent outlets
Servitudes that CANNOT be prescribed (discontinuous or non-apparent):
- Passage rights (droits de passage) — these require active human use and are discontinuous by nature
- Water drawing (puisage) — intermittent use of a well or spring
- Drainage of waste water or sewage through a pipe (Civ. 3e, 17 June 2021, No. 20-19.968) — unless there are visible surface signs, the servitude is not apparent
The policy behind this rule is clear: Article 691 of the Code civil aims to prevent mere acts of neighborly tolerance from hardening into permanent servitudes. If your neighbor has used your land peacefully but not continuously and visibly, that tolerance shouldn’t automatically become a binding legal right.
Expansion of Existing Servitudes
Here’s a scenario: Your property has a legal right of way (droit de passage) across a neighbor’s land, established in your deed centuries ago. The original grant was a narrow footpath for access. Over time, the usage expands — it becomes a drive suitable for vehicles, then wider still to accommodate farm equipment. If this expanded use continues for 30 years uninterrupted and apparent, the mode and manner of the servitude can itself be expanded by prescription under Article 708 of the Code civil. But the expansion is still limited to continuous and apparent uses — you cannot expand a passage right into a right to conduct commercial operations across the neighbor’s land.
For landlocked properties (propriétés enclavées), Article 685 of the Code civil provides that if a property has no access to a public road, the owner has a legal right to cross neighboring land to reach the road. If access by a particular route and manner has been exercised continuously for 30 years, that route and manner are fixed — the neighbor cannot later force a different route. This is a specific application of prescription to servitudes of necessity.
Acts of Tolerance — The Neighborly Trap
Here’s the trap that catches well-intentioned British owners: if you tolerate a neighbor’s use of your land, they cannot gain prescription rights from that tolerance alone. Article 2262 of the Code civil is clear: “Acts of pure faculty and tolerance cannot found possession.”
The logic is sound. If you knowingly allow something — if you have the power to stop it but choose not to — then the user cannot be said to possess the land as an owner (animus domini). They’re using it only because you permit it, revocably. You, the true owner, are in control.
Classic examples:
- You let a neighbor cross your land to reach a shed on their property — that’s tolerance, not a right of passage.
- You allow them to draw water from your well during a dry summer — that’s a neighborly favor, not a water servitude.
- You permit them to cut hay from a strip of your land for a few seasons — that’s tolerance, not adverse possession.
- You open small light windows (jours de souffrance) in a dividing wall as a temporary favor — not a legal light servitude.
The courts are relatively generous in finding tolerance (Civ. 3e, 23 Oct 1991 (source: Dalloz, Rép. civ., V° Prescription acquisitive, para 44)). If the evidence suggests the owner knew about and acquiesced to the neighbor’s use, tolerance is usually found. But there’s a catch: if you never object, if you remain silent and passive, courts may eventually infer that tolerance has hardened into permission that looks like ownership. The neighbor’s use, if unchallenged, begins to appear as though you’ve granted them a right.
Protection strategy: If you tolerate a neighbor’s use, make it crystal clear that it’s a favor, not a right. The best approach is to put it in writing — a simple convention de tolérance or a prêt à usage (loan for use), signed by both parties, stating that the use is temporary, revocable at will, and does not constitute a legal right. This creates a clear paper trail: if the neighbor later claims 30 years of prescription, you have written evidence that the use was always tolerance, always under your control, and always revocable. That breaks the conditions for prescription.
The Clandestine Encroachment Problem
Prescription acquisitive has four vices — conditions that, if present, invalidate the prescription claim even if 30 years have passed. One of the most relevant for boundary disputes is clandestinity (clandestinité).
Clandestine possession is possession hidden from the true owner. If the neighbor’s use is secret, unknown to you, it does not qualify as peaceful (paisible) possession. The textbook example is a neighbor secretly digging a cellar under your building and occupying it without your knowledge. Even after 30 years, that possession is void — it was clandestine.
For agricultural and rural properties, clandestinity is most relevant in the context of boundary creep. Imagine a farmer who, year after year, plows a few centimeters further into your field. The encroachment is gradual, almost imperceptible. You might not notice the slow shift in the boundary. If done deliberately to hide from you, the possession is clandestine and does not qualify.
However, clandestinity is not absolute. The law recognizes that clandestinity is relative and temporary:
- Relative: Clandestinity is only opposable (only protects) the person from whom it was hidden. If the farmer hid the encroachment from you, the clandestinity defense works for you. But it doesn’t help a third party.
- Temporary: Once the encroachment becomes visible — once you discover it — the clandestinity vice ceases. From that moment forward, the possession is no longer hidden. If you then remain silent for 30 years, the prescription clock starts ticking afresh (or continues from discovery), and after 30 years of open, known use, the neighbor can claim acquisition.
This is why documentation matters. If you discover an encroachment or suspect gradual boundary creep, record it with a date (photograph, letter to your neighbor, formal notice via huissier de justice). This breaks clandestinity and marks the moment when the use becomes public and known to you. From that point, the 30-year clock resets. If the encroachment continues openly for another 30 years despite your protest, the neighbor might eventually acquire it — but you’ve at least interrupted any prior clandestine period.
How to Resolve Boundary Disputes
Here’s a practical roadmap for British owners facing boundary uncertainty or disputes:
Step 1: Check Your Title Deed and Cadastral Plan
Start with paperwork. Retrieve your titre de propriété (title deed) from your notaire or from your personal files. Compare the property description and any plan attached to the deed with the official cadastral plan. You can download your cadastral plan for free from cadastre.gouv.fr — enter your commune, section, and parcel number, and the plan downloads as a PDF.
Look for discrepancies between the deed and the cadastre. If your deed mentions dimensions, do they match the cadastral area? Are there any boundary markers or natural features mentioned in the deed (a stream, a road, a ridge)?
Step 2: Walk the Boundaries and Look for Bornes
Put on walking boots and inspect your property’s physical boundaries. Look for bornes — boundary markers, usually concrete posts with carved markings. They’re often placed at corners or along the boundary line. Sometimes they’re missing, hidden under vegetation, or illegible with age. Photograph what you find. Note any discrepancies between the physical markers and your cadastral plan.
This is particularly important if you have rural or agricultural land. Walk the entire perimeter if possible. If you notice your neighbor’s field seems to extend further than expected, or a fence is not where you’d expect based on your documents, mark those spots with GPS coordinates or clear photographs.
Step 3: Attempt an Amiable Bornage with Your Neighbor
If you have doubts or disputes, the best first step is a friendly conversation followed by a professional amiable bornage. This is not confrontational — it’s the standard way to resolve boundary ambiguity in France. Propose to your neighbor that you jointly commission a géomètre-expert (licensed surveyor) to survey and formally mark the boundary.
You can find géomètres-experts through the Ordre des géomètres-experts (professional order) or by asking your notaire for a referral. The cost is typically €600–€3,000 depending on property size and complexity. You can split the cost 50/50 with your neighbor, or arrange it as you both agree. Many rural communities have standing relationships with local géomètres and this process is routine and swift.
Step 4: Formal Boundary Report and Physical Markers
If the amiable bornage proceeds, the géomètre-expert will conduct a site survey, review deeds and cadastral documents, and place physical bornes (boundary markers) at the agreed boundary line. They’ll draft a procès-verbal de bornage — a formal boundary report describing the survey, the boundary location, and any bornes installed.
Both you and your neighbor should sign the procès-verbal. This document is then registered (transcrit) at the service de publicité foncière (land registry office, also called the bureau des hypothèques). Registration makes the boundary report opposable to third parties — if you later sell, your buyer and their lender will see the official boundary established by the procès-verbal.
Step 5: Registration at the Land Registry
Have your notaire register the procès-verbal de bornage at the local service de publicité foncière. This is essential. Registration creates a public record, updates the property file, and protects you if there’s ever a future dispute. Without registration, the procès-verbal is merely an agreement between you and your neighbor — useful, but not as authoritative.
Step 6: If the Neighbor Refuses, Invoke Article 646
If your neighbor refuses to participate in an amiable bornage, refuses to share the cost, or disputes the findings, you have a legal remedy. Article 646 of the Code civil is your right. You can file a petition (demande) at the tribunal judiciaire (district court) for a judicial bornage (bornage judiciaire).
The process works like this:
- You file a petition with the court, identifying the property and explaining the boundary dispute.
- The court appoints a géomètre-expert to conduct the survey (not your choice, but a court-appointed expert).
- Both you and your neighbor are notified and can present evidence (deeds, photos, prior agreements).
- The expert surveys the property and prepares a report.
- The court reviews the expert’s findings and issues a judgment.
- The judgment is binding and is automatically registered at the land registry.
Judicial bornage is more expensive than amiable bornage (you’ll pay court costs, your notaire’s fees, and the expert’s bill — potentially €3,000–€6,000+), and it takes longer (months, sometimes a year), but it’s your guaranteed path to a legally definitive boundary.
Step 7: If You Suspect Adverse Possession, Consult Immediately
If you discover that your neighbor has occupied a portion of your land for what might be 30+ years — whether it’s a long-standing fence, a garden, agricultural use, or structures — do not delay. Consult a notaire or avocat specializing in droit immobilier (property law) immediately.
Why? Because time works against you. The longer the occupation continues, the stronger the neighbor’s claim becomes. A notaire can advise whether the occupation meets the legal criteria for prescription and what steps you should take to interrupt or challenge it. The earlier you act, the more options you have.
Step 8: Document Everything
Throughout any boundary dispute or concern, maintain a comprehensive record:
- Photographs: Dated photos of the boundary, bornes, fences, structures, and any encroachment or uncertainty.
- Maintenance and use records: If you maintain fences, trim hedges, or perform other acts of ownership along the boundary, keep records and photographs. These show your active control.
- Correspondence: All emails, letters, and agreements with your neighbor regarding the boundary. If you object to their use, send a letter (keep a copy).
- Formal notices (mises en demeure): If a boundary dispute arises, send a formal notice via a huissier de justice (bailiff) to your neighbor stating your position. A huissier-drafted notice is official and creates a legal record. It interrupts any potential prescription claim and shows you acted promptly.
- Professional reports: Retain any reports from géomètres-experts, notaires, or legal advisers.
This documentation is your protection. If a dispute ever reaches court, your contemporaneous records — photographs, letters, maintenance logs — are far more persuasive than later memory.
Practical Tips for British Owners
Drawing on the guide above, here are actionable steps to protect yourself:
1. Walk your boundaries regularly — especially on rural properties. Make it seasonal. Spring and autumn, after maintenance or before winter, do a perimeter walk. Check for encroachment signs (new fences, plowing beyond the expected line, structures appearing), missing or damaged bornes, or evidence of your neighbor’s use in disputed areas.
2. Never assume the cadastre is accurate. The cadastre is decades out of date in many rural areas. It’s a fiscal tool, not a boundary document. If you have any doubt — and you should, especially on older rural properties — commission a professional bornage before or immediately after purchase. It costs €600–€3,000 and can save you a fortune in boundary disputes later.
3. If a neighbor’s use bothers you, act immediately. A friendly conversation is fine and often productive — French neighbors often respect a polite, direct discussion. But follow it up with a written record. Send an email or letter summarizing what you discussed and your understanding (e.g., “As we discussed, the path across my property is for your private use only and can be revoked at any time”). This creates a paper trail showing the use is tolerated, not a right.
4. For anything more serious, use a formal mise en demeure. If a neighbor is encroaching, if you suspect long-standing occupation, or if a friendly discussion didn’t resolve things, engage a huissier de justice to send a formal notice (mise en demeure). This is professional, creates an official record, and interrupts any potential prescription claim. It signals that you’re taking the matter seriously and are willing to litigate if necessary.
5. When buying, always commission a bornage before completion — especially for rural and semi-rural properties. Include it in your conditions of sale. A bornage report obtained pre-purchase gives you certainty and, if major discrepancies are found, it gives you leverage to renegotiate or pull out. See our guide on how to buy property in France for more on the purchase process.
6. If you use an SCI to hold the property, maintain visible control. An SCI (société civile immobilière — property holding company) is common for British investors in France and offers tax and liability benefits; see our SCI guide for details. But here’s a risk: if your SCI is passive, absent owners rarely visit or maintain the property, the land looks abandoned or underused, a boundary creep by a neighbor can look more and more like tolerated, ownership-like occupation. Keep the property visibly maintained. Visit regularly. If you hire a local manager, ensure they’re vigilant about boundaries.
7. Maintain a visible local presence or hire a property manager. For absentee British owners, a local property manager (gestionnaire) is invaluable. They keep eyes on the ground, perform basic maintenance, monitor boundaries, and can alert you to changes or encroachments early. Early detection is your best defense.
FAQs
1. Is the French cadastre legally binding for boundaries?
No. The French cadastre is a fiscal document maintained for tax assessment and land records. It shows approximate property areas and plot divisions, but it is not a legal guarantee of boundaries. The cadastre can be inaccurate, outdated, or incomplete — especially for rural properties where boundaries have never been formally surveyed. Legal boundaries are established by your titre de propriété (title deed), a formal bornage (boundary survey) performed by a géomètre-expert, or by prescription acquisitive (adverse possession). Never rely on the cadastre alone. If you have any doubt about your boundaries, commission a professional bornage.
2. Can I force my neighbor to agree to a boundary survey?
Yes. Article 646 of the Code civil gives every property owner the right to compel their neighbor to participate in a boundary survey (bornage). If your neighbor refuses to participate in an amiable bornage or refuses to pay their share of the cost, you can file for a judicial bornage (bornage judiciaire) at the tribunal judiciaire (district court). The court will appoint a géomètre-expert, oversee the survey, and issue a binding judgment establishing the boundary. Your neighbor cannot prevent this.
3. How does a neighbor actually claim part of my land through prescription?
Through prescription acquisitive (prescription trentenaire). If your neighbor continuously, peacefully, publicly, and as owner occupies a portion of your land for 30 consecutive years, they can legally claim ownership of that portion. The process typically starts when they formally invoke the prescription — often by obtaining an acte de notoriété acquisitive (certificate of acquisitive title) from a notaire, which documents the 30 years of occupation through witness testimony and lodges a claim. Important caveat: this document has limited evidentiary force — it does not by itself prove ownership and can be challenged in court (source: Dalloz, Rép. civ., V° Prescription acquisitive, para 157). If contested, a judge will assess the actual possession facts independently. Prescription can override even a published title deed, so this is a serious risk. The key to defending yourself is early detection and action: if you discover encroachment, object immediately (formally if necessary) to break the prescription period.
4. Can a right of way (droit de passage) be acquired by prescription?
Not directly. Passage rights are discontinuous servitudes — they require active human use rather than operating continuously. Article 690 of the Code civil limits prescription of servitudes to those that are both continuous and apparent. A passage right, no matter how long it’s been used, cannot be acquired by prescription because it’s discontinuous. However, if your property is landlocked (enclavé) and has no access to a public road, you have a legal right to cross neighboring land to reach the road. Under Article 685, if you’ve used a particular route and manner to access the road for 30 years, that route becomes fixed — your neighbor cannot force you to use a different route.
5. My neighbor built a wall touching mine. Can they claim co-ownership?
Potentially. If your neighbor has leaned constructions against your wall for 30 years, they may acquire co-ownership (mitoyenneté) through prescription acquisitive. However, there’s a critical exception: if they encroached over the boundary line into your land, that encroachment breaks the prescription claim — mitoyenneté cannot be acquired. The distinction is: building ON your wall (using it as support) can lead to prescription-acquired mitoyenneté; building OVER the boundary (crossing the line) is encroachment and prevents mitoyenneté. To protect yourself, clarify whether the wall is mur mitoyen (shared) or your exclusive property. If it’s exclusive, maintain it clearly and do not permit the neighbor to modify or build against it without a written agreement.
6. I’ve let my neighbor use a path across my garden for years. Am I at risk?
Not from prescription acquisitive, because passage rights are discontinuous and cannot be acquired by prescription. However, if you’re concerned about the long-term relationship or want to clarify the arrangement, make your tolerance explicit in writing. Draft a simple convention de tolérance or prêt à usage (loan for use), signed by both parties, stating that the use is a temporary, revocable favor granted at your sole discretion and does not constitute a legal right. This creates a clear paper trail: if the neighbor later claims ownership or a right, you have written evidence that the use was always tolerance under your control. Without such documentation, there’s no legal risk from prescription, but there can be practical relationship issues.
7. What’s the difference between a bornage and the cadastre?
The cadastre is a government-maintained fiscal map showing approximate property areas, plot divisions, and registered ownership changes for tax purposes. It’s not a legal boundary document and can be inaccurate or outdated. A bornage is a formal boundary demarcation performed by a licensed géomètre-expert (surveyor) that precisely establishes and marks the boundary between two properties. A bornage can be amiable (agreed between neighbors) or judicial (ordered by a court). Once completed, the bornage is registered at the land registry and becomes the official legal boundary. In short: the cadastre is a fiscal tool; a bornage is a legal document.
Non-Affiliation Disclaimer
The English Investor is not affiliated with any law firm, notaire, géomètre-expert, or legal service mentioned in this article.
Further Reading
For more on French property ownership and related topics, explore our guides on how to buy property in France, French mortgages for non-residents, French inheritance law, and SCIs for British investors.
