Lessor or tenant: who should pay in the event of an infestation?

Contents

• The basics of Belgian law: decent housing and maintenance obligations

• Analysis by type of pest: cockroaches, bedbugs and rats

• Procedure and dispute resolution: proving fault and taking action

• Conclusion

Cockroaches in the kitchen, bedbugs in the mattress, rats in the cellar. You're a tenant wondering whether you should pay for the pest control. Or you're a landlord and your tenant sends you a hefty bill. The question comes up again and again, and the answer is never as simple as «yes» or «no».

Things to remember

• An exhaustive analysis of Belgian law (Wallonia, Brussels, Flanders) on infestation liability

• We go beyond generalities to deal with 5 concrete cases (cockroaches, bedbugs, rats, hornets, moths), combining obligations of decency with scientific evidence of fault.

• The concept of decent housing and maintenance obligations

• Specific cases of cockroaches, bedbugs and rats

In Belgium, the division of pest control costs between tenant and landlord depends on a central criterion: the origin of the infestation. Who caused the problem, or rather, who failed to prevent it? Belgian law, whether in Wallonia, Brussels or Flanders, sets out a clear framework of obligations. But you have to know how to read it. That's exactly what we're going to do here, with legal texts in hand, with five concrete cases of pests in Belgium, so that you know exactly who has to pay.

We won't be content with generalities. We're going to cross-reference legal obligations with what science has to say about the behavior of these bugs, because that's often where the proof of fault lies.

The basics of Belgian law: decent housing and maintenance obligations

Before talking cockroaches or bedbugs, we need to establish the legal basis. In Belgium, three regions, three laws, but one common principle: the landlord must provide decent accommodation. This is not an option, it's a legal obligation that conditions the very validity of the lease.

In Wallonia, the Code wallon de l'Habitation durable (articles 3 et seq.) requires that rental properties meet minimum health standards. A dwelling infested with pests at the time of letting does not meet these criteria. Point. The lessor cannot hand over the keys to an apartment with cockroaches behind the baseboards and say «you'll have to sort it out».

In Brussels, the standards are set by the Brussels Housing Code Ordinance of July 17, 2003. The dwelling must be «in a good state of repair» and present no health risk to the occupants. A rat infestation, for example, is an obvious health risk: rodents are vectors of leptospirosis and salmonellosis, and contaminate food surfaces. The ECDC (European Centre for Disease Prevention and Control) has extensively documented this.

In Flanders, the Vlaamse Wooncode and the Quality Standards Decree of July 12, 2013 impose the same basic standards. The dwelling must be free of structural defects that would encourage the appearance of pests: unsealed cracks, leaky pipes, faulty ventilation.

Now, the landlord's obligations don't stop when the keys are handed over. The landlord is obliged to carry out «major repairs» (article 1720 of the old Civil Code, still applicable in Belgian lease law). This includes everything to do with the structure of the building: sealing off entry points for rodents in the walls, repairing a leaky pipe that attracts cockroaches, replacing a roof through which pests have infiltrated.

The tenant, on the other hand, is responsible for routine maintenance and «minor repairs» (article 1754). In practical terms, what does this mean? Keep the apartment clean, don't leave food accessible, take out the garbage, report any problems promptly. If a tenant stores food waste in his room for three months and cockroaches appear, it's his responsibility. Rental maintenance is common sense put into legal form.

The tricky part is when the infestation has several causes. A structural defect in the building (liability of the lessor) combined with a lack of hygiene (liability of the lessee). In this case, Belgian case law tends to examine the primary cause. If the dwelling had cracks that allowed mice to enter even before the tenant moved in, the landlord cannot clear himself of liability by pointing to a few crumbs on the worktop.

One last essential point: the entry inventory of fixtures. This document, mandatory in Belgium for all leases of principal residences, is your best protection, whether you're a landlord or a tenant. If the inventory mentions traces of pests or favorable conditions (excessive humidity, holes in the walls), the landlord's responsibility will be difficult to contest. Conversely, if the dwelling was spotless when you moved in, and the infestation occurs after two years of occupancy, the tenant will find it hard to deny liability without proving a latent defect or structural fault.

Analysis by type of pest: cockroaches, bedbugs and rats

Not all pests are equal before the law. Their biology, their mode of propagation and the conditions that favor their installation radically change the question of liability. Let's take a look at five concrete cases.

Cockroaches (Germanic, Oriental)

Cockroaches are probably the most contentious case. Why is that? Because they can arrive in two very different ways. Either they were already in the building before the tenant arrived, nestling in the service ducts, false ceilings or communal pipes. Or the tenant may have introduced them unintentionally (moving boxes, shopping from an infested shop).

A study published in the Journal of Economic Entomology shows that the German cockroach (Blattella germanica) colonizes mainly via passive transport in packaging and via shared pipe networks in buildings. If the building has a history of infestation, or if several apartments are affected simultaneously, this is a strong indication that the problem is structural. The landlord must then take charge of the deratting, or rather disinsectisation, and treat the whole building.

If only one dwelling is affected, and the tenant has been living there for some time without reporting any problems, the burden may fall on the tenant. The key criterion: was the infestation pre-existing or the result of a lack of routine maintenance?

Bed bugs

A very special case. Responsibility for bedbugs is a subject of debate throughout Europe, and Belgium is no exception. Bedbugs are not linked to a lack of hygiene. The WHO and the FPS Public Health confirm it: they are spread by transport in luggage, clothing and second-hand furniture. You can have a spotless apartment and still bring home bedbugs from a five-star hotel.

Under Belgian law, if bedbugs were present before the tenant moved in (which happens more often than you'd think, especially in properties with a high turnover of tenants), the landlord has to pay. The property was simply not decent when it was rented out. If the tenant has introduced them after moving in, the burden of proof falls on him/her.

The problem is the proof. Bed bugs can remain dormant for several months without feeding (Cimex lectularius survives up to 12 months without a blood meal under favorable conditions, according to a University of Kentucky study). A tenant who moves in in January may not see the first signs until June. That doesn't mean he's brought them with him. The initial inventory of fixtures and fittings, and a rapid assessment by a professional, are crucial here.

Rats and mice

Rat removal in Belgium follows a fairly clear logic. Rodents enter a building through structural openings: cracks in foundations, poorly sealed pipes, missing or damaged ventilation grilles. These are defects for which the lessor is responsible.

The Règlement général communal de salubrité (applicable in many Belgian communes) requires the landlord to maintain the building in a condition that prevents rodents from entering. If rats enter through a hole in the cellar wall, the landlord pays. If the tenant leaves open garbage bags in the garden and attracts rats that were previously absent, the discussion changes.

In practice, the cost of rat removal in Belgium is very often borne by the owner, because the root cause is almost always a building defect. Rats don't choose a dwelling for its crumbs: they choose an entrance.

Hornets (European and Asian)

A hornet's nest in the attic or under the roof? It's up to the owner to intervene. The reasoning is simple: the attic, roof and loft are part of the structure of the building. Maintenance of these areas is not the tenant's responsibility. What's more, the general police regulations even include a specific clause obliging owners to remove any nests that cause nuisance on their property. For Asian hornets (Vespa velutina), classified as an invasive species in Belgium, some communes even offer free or subsidized intervention. Check with your local authority before you pay anything.

Moths (food and textile)

Hornets and moths are often lumped together as «secondary pests», but their legal treatment differs. Food moths (Plodia interpunctella) arrive almost exclusively via food purchased by the tenant: flour, rice, cereals. Responsibility therefore clearly lies with the tenant. The same applies to textile moths: they settle in the tenant's clothing and textiles.

Exception: if the property was furnished by the landlord and the moths were already in the textiles provided (curtains, carpets, bedding), the burden falls on the landlord. Once again, it's a question of origin.

Procedure and dispute resolution: proving fault and taking action

Now you know who should theoretically pay. Now comes the practical part: how do you assert your rights when the other party refuses to pay?

Step 1: Document the infestation

First of all, build up your proof of infestation. Take time-stamped photos. Film if necessary. Note the dates of your first observations. Store dead insects in an airtight bag (yes, it's unpleasant, but a dead cockroach in a zip-lock is evidence). If possible, call in a pest control professional to draw up an expert pest report. This report should identify the species, assess the extent of the infestation and, ideally, determine its probable origin (structural, behavioral, external).

This report has considerable value in court. An expert who writes «the infestation of German cockroaches originates from the building's communal service ducts, with multiple points of entry at the level of unsealed pipes» clearly points the finger of responsibility at the landlord.

Step 2: Formal notice

Once you've compiled your file, send a formal notice by registered mail with acknowledgement of receipt. This is an essential step. Without it, a judge could consider that you haven't given the other party a chance to react.

What should be included in the formal notice? The facts (date of detection, nature of the infestation), the legal basis (landlord's obligations under the Decent Housing Act, or tenant's obligations under routine maintenance, as the case may be), your specific request (covering the cost of disinsectisation, carrying out work to prevent recurrence) and a reasonable deadline for action (15 to 30 days).

Be factual. No emotional accusations, no disproportionate threats. Send a clean, well-documented letter, with attachments (photos, expert's report, estimate of costs).

Step 3: Conciliation and the justice of the peace

If there's no response to the formal notice, or if the disagreement persists, head for the Justice of the Peace. In Belgium, this is the competent court for rental disputes. The procedure is relatively accessible: no need for a lawyer (although recommended for complex cases), limited procedural costs, and often reasonable deadlines.

Before the hearing, the justice of the peace usually proposes an attempt at conciliation. This is often where things are settled. Many lessors, faced with a solid case with expert reports and photos, prefer to come to an agreement rather than risk being condemned to pay the costs of disinsectisation plus damages.

The Justice of the Peace may order a judicial expert report if the evidence provided is insufficient to reach a decision. A court-appointed expert will visit the dwelling, identify the causes of the infestation and issue a report that is largely binding on the judge's decision.

Stage 4: the health emergency

Sometimes there's no time to wait. A massive infestation of bedbugs or rats represents an immediate health risk. In such cases, the tenant can have the pest control work carried out at his or her own expense and claim reimbursement from the landlord, provided that he or she has given the landlord prior notice and can prove the urgency of the situation.

Warning: don't do just anything. Keep all quotations and invoices. Choose a registered company. Homemade« treatments with insecticide sprays bought from supermarkets will not be reimbursed, and may even make the problem worse (cockroaches, in particular, develop resistance to over-the-counter pyrethroids, as shown by a Purdue University study published in Scientific Reports in 2019).

The special case of mold

We're often asked the question: is the tenant responsible for mold? The logic is the same as for pests. If mold is the result of a structural defect (infiltration, thermal bridge, lack of mechanical ventilation), it's up to the landlord to deal with the problem. If it results from the tenant's behavior (never ventilating, drying laundry in a closed room without a dehumidifier), responsibility shifts. And mold favors certain pests, notably woodlice and silverfish. It's all connected.

The question of costs: labor vs. products

A point that often comes up in disputes is the distinction between the cost of labor and the cost of products. In Belgian law, this distinction is not really relevant to determining who pays. What counts is the cause of the infestation. If the lessor is responsible, he pays for everything: diagnosis, products, labor, follow-up. If the tenant is responsible, ditto. We're not going to split a €350 bill into «€150 of product for the lessor and €200 of labor for the lessee». There's no legal basis for that.

Conclusion

The question «landlord or tenant, who should pay for an infestation?» boils down to just one thing: the origin of the problem. Structural defect, non-decent rental property, hidden defect? The landlord pays. Lack of routine maintenance, introduction of pests by the tenant, neglect of hygiene? The tenant pays.

In both cases, the key is proof. A good inventory of fixtures on arrival, photos, an expert's report and a well-written formal notice. Without these, you'll go to court empty-handed.

If you're faced with an infestation and dialogue with your landlord or tenant is blocked, don't let the situation escalate. Call in an approved professional for a diagnosis, put together your file and take action. Pests don't wait, and the damage to health and property only increases with time. At Pest Patrol, we can help you with diagnosis and intervention, and provide you with the technical documentation that will make the difference in the event of a dispute.

Frequently asked questions