Moving bed bugs between apartments: the guide

Contents

• Passive transport vs. active migration: how they infiltrate your home

• Sheaths, cracks or neighbors: contamination risk criteria

• Preventing infestation: recommendations before moving or buying a new home

• Conclusion

Your downstairs neighbor has bedbugs. You've just found out, and you've been sleeping poorly ever since. Not because of the bites, not yet, but because you're wondering: can they get through the wall? Go through the electrical sockets? Up the pipes? The short answer: yes, to all that. The long answer is this article.

Things to remember

• We analyze the building as an ecosystem where bedbugs use invisible ‘highways’ (wiring, ventilation, cracks).

• The article differentiates between active migration and passive contamination to offer a precise diagnosis of vulnerability for the inhabitants of Brussels.

• How they infiltrate your home

• Compare the different options before deciding.

In Brussels, we regularly intervene in buildings where the spread of bedbugs has affected three, four, sometimes six apartments before someone raises the alarm. The problem is that most residents don't understand how these bugs circulate. They think that if their home is clean, they're protected. A building is an ecosystem. Bedbugs find invisible highways that you'd never suspect. We'll take a look at them, explain what's passive transport and what's active migration, and, above all, give you the keys to assessing your own level of risk.

Passive transport vs. active migration: how they infiltrate your home

First thing to understand: bed bugs arrive in an apartment in two fundamentally different ways. And the distinction changes everything for your defense strategy.

Visit passive transport of bed bugs, This is the most common mode of contamination. You bring bedbugs home without knowing it. In a bag, a piece of clothing, a second-hand piece of furniture, a suitcase after a trip. They don't actively move towards your home: you offer them a cab. A coat on an infested chair at a friend's house. A sofa found on the sidewalk (a Brussels classic, and a classic source of problems). A moving box stored in a contaminated cellar. This passive transport explains why apartments on completely different floors, with no physical connection, can become infested almost simultaneously.

Visit active insect migration, it's a different story. Here, bedbugs move around on their own, from one dwelling to another. Many people don't believe this. And yet, an adult bedbug will travel around 1 to 1.5 meters per minute on a flat surface. Sounds slow. Except that they're nocturnal, they have all night to roam, and between two adjoining apartments, there's sometimes less than 30 centimetres of partition to bypass via a duct or crack. The speed of movement of a bedbug is not the limiting factor: it's access that counts.

When is this active migration triggered? There are two main situations. Either the original colony has become so dense that competition for food drives some individuals to explore new territories. Or the source apartment has been treated with an insecticide, but poorly treated, which disperses bedbugs instead of eliminating them. We see this regularly: a tenant buys a can of insecticide from a supermarket, sprays it all over his room, and the bedbugs flee to the apartment next door. The problem isn't solved, it's displaced.

Do bedbugs move quickly? Not in the sense of a fly or a cockroach. But it doesn't need speed. They have perseverance. A fertilized female migrating through your apartment can lay between 200 and 500 eggs in her lifetime. A single individual is enough to launch a complete infestation. That's why cross-contamination between apartments is so formidable: you only need one bug in the right place at the right time.

The trap is to think of only one of these two mechanisms. In reality, in an affected building, the two almost always coexist. The neighbor brings in bedbugs from a hotel (passive transport), the colony grows, then the bedbugs actively migrate to your home via the walls. The result: you're infested without having done anything «risky».

Sheaths, cracks or neighbors: contamination risk criteria

A typical Brussels apartment block, especially in the older buildings of communes like Saint-Gilles, Schaerbeek or Ixelles, is a "gruyère". Not in the pejorative sense, but in the structural sense: there are passages everywhere between apartments, and most of them are invisible.

Visit apartment service ducts are the primary migration vector. The vertical ducts that run through the building from top to bottom, carrying electrical cables, plumbing, central heating and ventilation, are a four-lane highway for bedbugs. The ducts are almost never perfectly watertight. There are gaps around pipes, and unsealed spaces at tile penetrations. A bedbug 5 millimeters thick (even less for nymphs) can easily squeeze through.

Visit electrical outlets are a classic. In many apartment buildings, the outlets of two neighboring apartments are installed back to back in the same partition. Between the two, there's often little more than air and cracked plaster. Entire colonies have been found nesting behind socket plates, in the space between the flush-mounted box and the partition. If your neighbor is infested and you share a wall, check your outlets. Seriously.

Visit bedbug crossing points don't stop there. Loose baseboards, cracks in load-bearing walls, deteriorating tile joints in bathrooms, ill-fitting landing doorways, false ceilings: every building defect is an open door. In an old building, these defects can be counted in dozens.

How do you assess your actual risk? Here are the criteria we use when we diagnose your vulnerability:

• Age of building : before 1970, the risk of unsealed passages is very high. Partitions are often of hollow brick or half-timbered construction, rarely watertight.

• Type of heating : a central heating system with cast-iron radiators and pipes running through the slabs creates points of passage on each floor.

• Group ventilation : controlled mechanical ventilation ducts connect all apartments. If they're not fitted with anti-insect filters (spoiler: they almost never are), bedbugs can move around in them.

• Occupancy density : the more units there are on each floor, the larger the contact surfaces between apartments, and the greater the risk of cross-contamination.

• History of infestation in the building : if an apartment has already been treated, this means that bedbugs are (or have been) present in the building. And localized treatment is no guarantee of building-wide eradication.

L’building infestation it doesn't happen overnight. It takes weeks, sometimes months. But when several apartments are affected, treatment becomes much more complex and costly. Each untreated apartment becomes a reservoir that re-infects the others. That's why a serious exterminator in Brussels will always insist on inspecting adjacent dwellings, above and below, when working on a reported case. If your syndic or landlord refuses to coordinate a global intervention, you've got a problem. A big one.

Can bed bugs move from one apartment to another? The answer is unambiguous: yes. And in a typical Brussels apartment building, the conditions are often ripe for this to happen.

Preventing infestation: recommendations before moving or buying a new home

You're signing a lease next week. Or you've just found the perfect apartment on Immoweb. Before you unpack your boxes, there are a few things you need to check. Not out of paranoia: out of common sense.

Visit preventing bed bugs when moving house starts even before you move into your new home. The first thing to do is ask the agency or landlord if the building has had any cases of bedbugs in the last two years. It can be an uncomfortable question, but it's a legitimate one. In Brussels, the problem is so widespread that no one can pretend not to understand.

Next, inspect the new apartment before installing anything. No need to be an entomologist. Here's what you're looking for:

• Small black spots (droppings) on baseboards, behind electrical outlets, in room corners, along bedroom walls.

• Brownish streaks on mattresses or box springs left by previous occupants (if furnished).

• Molting (translucent skins) in dark corners: behind built-in furniture, under baseboards, in closets.

• A sweet smell a little nauseating in the rooms. It's the sign of a colony that's been around for a while.

Do this inspection on your knees, using a flashlight. Bedbugs shy away from light and hide in places you'd never see on a regular visit. If the home is empty, it's easier: you have access to baseboards, sockets and nooks and crannies. If the property is still furnished, concentrate on the bedroom and living room (sofa, armchairs).

Visit expert advice on bed bugs in Brussels that we systematically give to our customers when they move:

1. Never collect furniture on the sidewalk. Never. Mattresses, sofas, box springs, bed frames: the risk is too high. Even furniture that looks clean can harbor eggs invisible to the naked eye.

2. Wash all textiles at 60°C before moving them into the new home. Clothes, sheets, curtains, cushions. Anything that can't stand 60°C should be tumble-dried at high temperature for at least 30 minutes.

3. Pack your belongings in airtight bags for transport. Thick garbage bags sealed with adhesive tape will do the trick. The aim is to prevent any bedbugs on board the removal van from contaminating your belongings.

4. Install bedbug covers on your mattress and box spring from day one. It's not a gadget. It's a physical barrier that prevents bedbugs from colonizing the seams and nooks of your bedding.

5. Seal cracks and gaps around electrical outlets, baseboards and pipes. Silicone sealant is all you need. It takes an hour, costs ten euros, and closes off the main migration routes from neighboring apartments.

If you're moving into a building with a known or suspected infestation in a neighboring apartment, don't wait for the first bites to take action. Call in a exterminator in Brussels for a preventive inspection. Canine detection, for example, can confirm or rule out the presence of bedbugs in less than an hour. This is a minimal investment compared to the cost of a complete curative treatment.

One last point that's often overlooked: talk to your neighbors. Not to accuse them, but to create a network of vigilance. In a block of flats, the fight against bedbugs is either collective or it fails. A single untreated apartment, and the whole thing starts all over again in the months that follow. If your building manager is reactive, so much the better. If it's not, get organized among the residents. It's the only approach that works in the long term in a multi-unit building.

Conclusion

The movement of bedbugs between apartments is not a hypothesis. It's a daily reality in the buildings of Brussels, from passive transport via your belongings to active migration through ducts, cracks and electrical outlets. Your home is not an island: it's connected to those around it by dozens of invisible passages.

Two things to remember. Firstly, prevention is infinitely less costly than treatment: inspect, seal and protect your bedding. Secondly, when faced with a confirmed neighborhood infestation, the response must be collective and coordinated. An insecticide applied to a single apartment will only push the problem onto the neighbor.

Suspecting contamination or preparing a move to Brussels? Contact us for an inspection. We always prefer to intervene too early rather than too late.

Frequently asked questions