Amicable Boundary Survey Impossible in Nice: What to Do When Your Neighbor Refuses?

PROPERTY — FRENCH RIVIERA

You bought a villa in Nice, in the heights of Cimiez. The garden is magnificent, but the boundary with the neighbor is unclear. You propose an amicable boundary survey (bornage amiable). He refuses. In my practice, 80% of boundary surveys in the Alpes-Maritimes department end up in court. Why? Because each party believes they hold the truth with their cadastral map and tape measure.

What You See — and What It Really Hides

On the ground, you see an old wire fence, a leaning low wall, a century-old olive tree. You measure 12 meters from the edge of the road. Your neighbor measures 11.50 m. Who is right?

What I often observe: property owners compare cadastral maps at different scales, or worse, use Géoportail (French online mapping) without parallax correction. On a case in Nice last year, the owner measured with Google Maps: 3.20 m error. The cadastre is not a surveying document; it is a fiscal representation. The only truth is the ground.

Boundary Survey Principle: Adversarial Measurement

The Calculations That Change Everything: Tolerance Under Decree 2011-1309

Boundary surveying is not done with a tape measure. We use a Leica TS16 total station (angular accuracy 1″, distance ±1 mm + 1.5 ppm) or GNSS RTK in RGF93/Lambert 93 (planimetric accuracy ±1 cm). We measure the distance between two existing markers. The legal tolerance is given by French Decree 2011-1309: T = (0.05 + 0.01 × √D) meters, where D is the distance in meters.

Concrete example: you measure 12.00 m, the neighbor 11.50 m. Difference = 0.50 m. For D = 12 m, T = 0.05 + 0.01 × √12 = 0.05 + 0.0346 = 0.0846 m. The difference is 6 times greater than the tolerance. What this means in practice: an amicable boundary survey is impossible because the positions are too divergent. The court will have to decide based on a court-appointed expert.

What Happens If You Do Nothing

Time works against you. Without a boundary survey, adverse possession (prescription acquisitive, 30 years) may allow the neighbor to claim part of your land. In Nice, with high property pressure, a square meter is worth between €500 and €2000. An encroachment of 5 m² means damages of €2,500 to €10,000.

In 6 months, the neighbor builds a wall. In 2 years, he fences it. In 5 years, you can no longer prove the boundary. The cost of a court-appointed expert (€3,000 to €5,000) is far less than the cost of a lawsuit for encroachment. Honestly, act now.

Recourse and Guarantees: What You Can Demand

Article 646 of the French Civil Code states: “Any owner may compel his neighbor to the boundary survey of their contiguous properties.” Boundary survey is a right. If the neighbor refuses an amicable solution, you must file a petition with the Judicial Court of Nice (tribunal judiciaire). The procedure is simple: summons for boundary survey (art. 646 C.civ. and Decree 2011-1309, §2). The judge appoints a surveyor expert. Costs are shared. In Nice, expect 6 to 12 months to obtain a judgment. Once the judicial boundary survey is pronounced, the markers are immovable. Send a formal notice by registered letter with acknowledgment of receipt (LRAR), then consult a lawyer specialized in real estate law. I can assist you as a topographical expert.

📅 Mis à jour le 31/07/2026 — Par Cassini Expertise, expert bâtiment indépendant 06 & 83. Devis gratuit : 04 22 46 06 04.

Questions fréquentes

What to do if neighbor refuses boundary survey?

If your neighbor refuses an amicable boundary survey, you can first try mediation or a formal written request. If that fails, you may need to hire a licensed surveyor to conduct a unilateral survey, but this may not be legally binding without your neighbor's consent. Ultimately, you may have to file a lawsuit to establish the boundary, which can be costly and time-consuming.

Can I force a boundary survey on my neighbor's property?

Generally, you cannot force a survey on your neighbor's property without their permission or a court order. However, you can request a court order if you have a legitimate dispute. In some jurisdictions, you may be able to enter the property with prior notice for survey purposes, but this varies by local law. It's best to consult a property attorney for guidance.

How to resolve a boundary dispute without a survey?

You can try to resolve a boundary dispute by reviewing property deeds, title documents, and any existing surveys. Sometimes, a mutual agreement on a new boundary line can be formalized through a boundary line agreement. If that's not possible, consider using a mediator to facilitate a compromise. If all else fails, legal action may be necessary.

📅 Mis à jour le 19/09/2026 — Cassini Expertise, expert bâtiment indépendant (06·83·13·40).