What are my rights in case of illegal construction by the neighbor?
You notice that your neighbor has undertaken work or construction without authorization, or in violation of planning rules? This situation, common in real estate law, can generate significant nuisances and impact the value of your property. It is essential to know your rights precisely to act effectively and stop this illegality.
How to define an illegal construction?
A construction is considered illegal when it is carried out without a building permit, without a prior declaration of works, or in non-compliance with the requirements of the permit obtained. This may concern a house extension, the creation of a terrace, a height increase, or the construction of a non-compliant garden shed. The Urban Planning Code sets the rules to be followed, and any infringement exposes the owner to criminal and administrative penalties.
What are your rights in the face of illegal construction?
The right to take legal action to stop the disturbance
As a neighbor, you have a legal interest to act if the illegal construction causes you direct harm. This harm can be a neighborhood disturbance (loss of sunlight, obstructed view, noise nuisance) or a loss of market value of your property. You can then take the matter to the judicial court to request the demolition of the structure or its compliance. It is crucial to act quickly, because limitation periods (often 5 years from completion of the work) may
The right to report the offense to the administration
You can also send a report to the town hall of the municipality where the construction is located. The mayor, as the competent authority in matters of urban planning, can draw up a report of the offense and order the interruption of work. If the construction is completed, the administration may require the filing of a modified building permit or, if regularization is impossible, initiate demolition proceedings. This report is free and can be made by registered letter
The right to damages
If the illegal construction causes you material or moral damage, you can claim compensation before the courts. For example, if the view of your garden is obstructed or if your house loses value, an expert can assess the amount of the damage. A well-conducted legal action can result in the award of damages, in addition to the demolition of the structure.
What are the steps to enforce your rights?
1. The amicable phase: favoring dialogue
Before any legal action, it is recommended to attempt an amicable resolution. Send a letter to your neighbor explaining the facts and the violated urban planning rules. Propose a meeting to find a solution (regularization, modification of works). This approach can avoid a long and costly conflict.
2. The administrative phase: report to the town hall
If dialogue fails, send a written report to the town hall. Attach photos, a site plan, and any evidence of the violation. The town hall is obliged to respond and take necessary measures. You can also consult the land certificate or building permit issued to verify its compliance.
3. The judicial phase: seizing the court
As a last resort, you can sue your neighbor before the judicial court. This procedure requires solid legal expertise. avocat expert in real estate law and building permits will be able to assess the strength of your case, draft procedural documents and represent you. The objective is to obtain a court decision ordering demolition or compliance, possibly under a penalty.
What are the risks for the neighbor builder?
The owner of an illegal construction faces criminal penalties (fine up to €300,000, even imprisonment in case of repeat offense), the obligation to demolish at their own expense, and damages to neighbors. They may also be denied connection to public networks or subsequent sale of the property, as the lack of urban planning conformity is a hidden defect.
Conclusion: act quickly with a professional
Faced with an illegal construction by your neighbor, do not let the situation escalate. Your rights are real, but their implementation requires an adapted strategy. Each case is unique: the nature of the infringement, the age of the works, and the configuration of the land influence the possible solutions. To maximize your chances of success, it is strongly recommended to consult a real estate lawyer. Maître Cécile Zakine, expert lawyer in building permits and litigation Contactez un avocat expert today for an initial analysis of your situation and to effectively defend your interests.
📅 Mis à jour le 18/08/2026 — Par Maître Cécile Zakine, avocate et Docteur en Droit à Antibes. ☎ 06 21 69 91 77.
