If you are buying a home near the Monaco border, establish whether reports of ground movement concern your chosen plot and building. A street name is a starting point; a decision needs the exact address, cadastral reference and building records.
What is known about the slope
Nice-Matin reported on 26 September that municipal services told the 15 September council meeting there had been no significant change in movement on the French side. It also described concern over a Guynemer permit. This is attributed reporting; the underlying monitoring report was not found in the documents reviewed.
Item 4 of the official meeting agenda does concern studies under the STEPRIM natural-risk prevention programme with SMIAGE. The agenda confirms a subject for discussion, not the safety of an individual building.
The chronology matters: on 30 December 2025, Monaco’s government announced that evacuated residents could return, with slope reinforcement and monitoring continuing. The September story should not be read as a new evacuation notice.
What the court decision establishes
The Nice Administrative Court judgment of 20 July 2026, no. 2506006, identifies a project at 22 boulevard Guynemer, cadastral plot AD144. The court annulled the municipality’s refusal of 16 May 2025 and ordered it to issue the requested permit within one month of notification of the judgment.
This identifies the decision challenged in that case: the initial refusal of permission. The judgment does not replace an assessment of the ground and structures. Our review did not obtain the subsequent permit or documents establishing any further appeal; the current position should therefore not be presented as finally settled.
Do not extend the history of AD144 to every building on boulevard Guynemer. For a neighbouring apartment, investigate its own plot, shared structures, retaining walls and drainage.
Documents to request before buying
French procedures apply to a property in Beausoleil. Proximity to Monaco does not bring it under the Principality’s rules. Checks for a property across the border must be established separately.
| Document or check | Question it should answer |
|---|---|
| Exact address, cadastral reference and plan | Is this the plot discussed in the source documents? |
| État des risques, plus the PPR map and regulations | Which restrictions apply? The first is a risk disclosure; a PPR is a natural-risk prevention plan |
| Permit, attachments and litigation decisions | What is authorised, on what conditions, and what is the case’s current status? |
| Technical assessments and monitoring records | What was examined, when, and what follow-up did the specialist recommend? |
| Damage, repairs and shared building works | What has been completed, what remains, and who pays? |
Service Public explains that, where a risk disclosure is required, the seller provides it at the first viewing. It must be less than six months old and updated if information changes before signing. Check the address and supporting documents; a risk disclosure is not a structural survey.
Géorisques records a ground-movement prevention plan for Beausoleil, approved on 15 May 2001. A municipal overview helps locate the documents; the applicable map and regulations are needed to establish a particular plot’s zone. Slope movement should not automatically be treated as drought-related clay shrinkage.
What this means for an apartment purchase
If the permit history is unclear, give the documents to your notaire, the French legal professional handling the conveyance, and refer litigation questions to a specialist lawyer. If there is no recent assessment of the slope or building, discuss the required investigation with a geotechnical or structural engineer before committing to buy. A missing report leaves an unanswered question; a price reduction does not answer it.
For an apartment, ask the syndic, the building’s managing agent, about assessments of shared areas, proposed works, quotations and the allocation of costs. Ground assessments, a works plan and contractual terms should support a clear decision on timing and budget.
The next question is which other works and costs concern the apartment and the building as a whole. Our guide to checking an apartment before purchase covers building documents, owners’ meeting decisions and works budgets.
If you have found a property, start a conversation with IMMO BTC with the listing link or address and your intended use. These details help us discuss which documents to request and which specialists to involve. Contact us via WhatsApp or info@immobtc.com, or call +33663567065.
Sources and verification date
Checked on 27 September 2026. The original Nice-Matin article is dated 26 September. This article distinguishes published documents, press reporting and matters requiring checks for the individual property.
