Introduction: A Recurring Question During Infestation Periods
Summer 2026 confirms a heavy trend observed for several years: the proliferation of urban pests is accelerating in France. According to the latest reports from ANSES (National Agency for Food, Environmental and Occupational Health and Safety), reports related to bed bugs, rats, and cockroaches have increased by nearly 15% compared to 2025. Faced with this reality, inhabitants of urban and suburban areas often find themselves helpless not only against the invasion but also against a complex legal question: who must pay for the treatment?
Whether you are a tenant, landlord, or member of a co-owners' association, the answer is not always intuitive. It depends on the origin of the infestation, the location of the pests (private or common areas), and the legal obligations defined by the Public Health Code and the Civil Code. In this article, we break down everyone's responsibilities to help you navigate these often stressful procedures.
Tenant vs Landlord: Sharing Responsibilities
The lease relationship is framed by the law of July 6, 1989, which clearly defines maintenance and repair obligations. However, the arrival of pests often creates a gray area prone to conflict.
When the Tenant is Responsible
In principle, the tenant is required to maintain the housing with "reasonable care". This means they must ensure the cleanliness and hygiene of the premises. If a cockroach or mouse infestation is directly linked to characterized lack of hygiene (accumulation of food waste, lack of regular cleaning), the tenant's liability is engaged. In this case, insect control or rat control costs are their exclusive responsibility.
The ADIL (Departmental Agency for Information on Housing) specifies that the tenant must also immediately report any sign of infestation to the landlord. A reporting delay that worsens the situation can be held against them during the exit inventory or in case of financial dispute.
When the Landlord is Responsible
The landlord, for their part, is held to an obligation to deliver decent housing. According to decree n° 2002-120 of January 30, 2002, a housing unit must not present manifest risks to the health or safety of occupants. The presence of recurrent bed bugs, rats in the walls, or toxic mushrooms can render the housing indecent.
If the infestation originates from the building structure (cracks in walls, defective pipes allowing rodent entry) or if it pre-existed entry into the premises, it is up to the landlord to cover the treatments. In 2026, with the resurgence of bed bugs, case law tends to protect the tenant more: if several units in the building are affected, the presumption of responsibility often shifts to the landlord or the co-ownership, as this indicates a structural problem.
Co-ownership: Managing Common and Private Areas
The situation becomes more complex in co-ownership buildings. The law of July 10, 1965 sets the framework, but field reality often requires case-by-case analysis.
Common Areas: Responsibility of the Property Manager
Basements, attics, technical shafts, shared gardens, and waste columns are common areas. If rats or hornets install their nests there, it is up to the co-owners' association, via the managing agent, to order and fund interventions. Costs are then split among all co-owners according to their ownership shares.
It is crucial that the property manager acts quickly. Inaction faced with a proliferation of rodents in common areas can engage the civil liability of the co-ownership in case of damage in private lots (chewed cables, contamination). In 2026, many property managers now integrate annual surveillance contracts into their forecast budget to anticipate these risks, notably concerning the Asian hornet whose progression is monitored by the Departmental Federations of Defense Groups against Harmful Organisms (FDGDON).
Private Areas: When the Problem Crosses Walls
The most delicate case remains where pests transit between common areas and private areas, or from one apartment to another. This is typically the case with bed bugs. If a treated apartment is reinfested by the upstairs neighbor who does not treat, conflict is inevitable.
In this scenario, the owners' council must play a mediator role. It is often recommended to vote in general assembly for a global treatment plan for the building. Although this represents an immediate cost, it is often the only durable solution. INRS (National Institute for Research and Safety) recalls that fragmented treatments are less effective and favor insect resistance to insecticides.
Public Spaces: When the City Hall Must Intervene
Not all pests invite themselves to your home. Some proliferate in parks, squares, schools, or building feet facing the public way. Here, responsibility lies with public authorities.
The Role of Municipal Services
City halls are responsible for the salubrity of public spaces. If you notice wasp nests in a communal tree, rats in a park adjacent to your home, or processionary caterpillars in a public alley, it is up to the city hall technical service to intervene. You must make a written report, ideally with supporting photos.
For serious cases, such as a rat invasion likely to spread leptospirosis, the city hall can be ordered to act by the Prefect. Santé publique France closely monitors these risk zones, notably during summer heatwaves where waste attracts animals more.
The Specific Case of the Asian Hornet
Destruction of Asian hornet nests is mandatory in France. If a nest is located on private land, it is up to the owner to have it destroyed. However, if the nest is in a tree by the roadside or on a public building, it is up to the local authority to cover the costs. Prefectural orders specify fight modalities each year, and in 2026, financial aid is sometimes available for individuals in the most affected zones.
Proof and Disputes: How to Protect Yourself Legally
In case of disagreement on cost coverage, one person's word is not enough against the other's. Constituting proof is the most important step to assert your rights.
Documenting the Infestation
From the first signs, take dated photos and videos. Keep dead insects in a hermetic jar for identification by a professional. If material damage is noted (bites on clothes, cut cables), have them photographed.
Calling a Certified Professional
A quote or intervention report from an approved pest control company holds weight. This document must specify the nature of the pest, the extent of the infestation and, if possible, the supposed origin. Some experts can even establish a contradictory report in the presence of the landlord and tenant.
Recourse to the Bailiff
If dialogue is broken, the bailiff report remains the solidest proof before a tribunal. Although costly (between 150 and 300 euros), it can be indispensable to obtain reimbursement or housing compliance. In case of procedure, the judge can condemn the responsible party to pay treatment costs, damages for moral prejudice, and sometimes relocation costs if the housing is uninhabitable.
Health Impacts: A Decisive Argument
Beyond the financial aspect, the health argument is primordial. Ameli (Health Insurance) recalls that certain infestations can have serious medical consequences.
Allergic and Infectious Risks
Cockroach droppings and bed bug skins are powerful allergens, likely to trigger or aggravate asthma, particularly in children. Rats, vectors of leptospirosis, represent a direct danger in case of contact with their urine or bites. In 2026, general practitioners are increasingly sensitized to these environmental risks and can prescribe sick leave or medical certificates attesting to the impact of the infestation on occupants' health.
A medical certificate can thus serve as a complementary piece in a legal file, proving the urgency of the situation and the insalubrious character of the housing. INRS also highlights occupational risks for cleaning or catering staff exposed to these pests without adequate protection.
Prevention: The Best Protection
Whatever the legal responsibility, prevention remains the key to avoid infestations and associated conflicts.
Best Practices for Tenants
- Strict hygiene: Do not leave dirty dishes overnight, seal trash bins hermetically.
- Rapid reporting: Warn the landlord at the sight of an isolated insect.
- Protect openings: Install mosquito nets, seal cracks around pipes.
Best Practices for Landlords and Property Managers
- Building maintenance: Repair cracks, install backflow valves on drains.
- Surveillance contracts: Set up regular professional visits for common areas.
- Information: Distribute prevention brochures to residents to harmonize barrier gestures.
Conclusion: Anticipate to Manage Better
The question of responsibility faced with pests in 2026 does not sum up to a simple bill to pay. It is a public health issue, real estate law, and living together. If the law clearly distinguishes landlord and tenant obligations, the reality of modern infestations, like bed bugs, often requires a collective approach.
In case of doubt, always privilege dialogue and the search for tangible proof. Do not hesitate to approach your local ADIL or a consumer association to get accompanied in your procedures. Healthy housing is a fundamental right, and the fight against pests is a shared responsibility that requires vigilance and reactivity from all housing actors.
For any specific question on vector-borne diseases or authorized biocidal products, consult the official resources of ANSES or Santé publique France. Regulations evolving rapidly, notably on insecticide use, staying informed is the best way to protect your home and your wallet.
