{"id":25886267,"date":"2026-03-18T19:16:44","date_gmt":"2026-03-18T18:16:44","guid":{"rendered":"https:\/\/punaisedelitbruxelles.be\/punaises-de-lit-par-la-fenetre-risques-et-solutions-a-bruxelles\/"},"modified":"2026-03-18T19:16:44","modified_gmt":"2026-03-18T18:16:44","slug":"bed-bugs-in-windows-risks-and-solutions-in-brussels","status":"publish","type":"post","link":"https:\/\/punaisedelitbruxelles.be\/en\/punaises-de-lit-par-la-fenetre-risques-et-solutions-a-bruxelles\/","title":{"rendered":"Bedbugs through the window: Risks and solutions in Brussels"},"content":{"rendered":"<h1>Can bedbugs get in through windows?<\/h1>\n<h3 id=\"sommaire\">Contents<\/h3>\n<ul>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#migration-des-punaises-de-lit-par-l-exterieur-comprendre-le-risque-en-ete\">Bedbug migration from outside: understanding the risk in summer<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#solutions-et-tarifs-pour-proteger-vos-fenetres-contre-les-punaises\">Solutions and prices to protect your windows against bedbugs<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#forfaits-d-intervention-punaisesdelitbruxelles-votre-devis-immediat\">Punaisesdelitbruxelles intervention packages: your instant quote<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#conclusion\">Conclusion<\/a><\/p>\n<\/li>\n<\/ul>\n<p>I'm often asked on the phone, \u00abMy neighbor has bedbugs, can they get into my house through the window?\u00bb The short answer is yes. The long answer is that the phenomenon is more common than you might think, especially in Brussels apartment blocks in summer, when everyone sleeps with their windows open.<\/p>\n<h3 id=\"ce-qu-il-faut-retenir\">Things to remember<\/h3>\n<ul>\n<li>\n<p>We lift the veil on a little-known risk: the migration of bed bugs between neighbouring apartments via open windows and fa\u00e7ades in summer.<\/p>\n<\/li>\n<li>\n<p>The article combines technical expertise on insect behavior and concrete solutions (physical barriers and professional treatments) with transparent pricing for Brussels residents.<\/p>\n<\/li>\n<li>\n<p>Understanding summer risk<\/p>\n<\/li>\n<li>\n<p>Compare options and take action.<\/p>\n<\/li>\n<\/ul>\n<p>Bed bugs in a neighboring apartment are a real source of anxiety. And rightly so. These bugs don't fly, they don't jump, but they do crawl. They crawl along walls, gutters and window frames. At night, attracted by the CO2 you breathe out as you sleep, they are capable of traveling several meters to find a host. When your bedroom is just a few dozen centimetres from your neighbor's, the math is easy.<\/p>\n<p>I've written this article for tenants and landlords in Brussels who want to understand this risk and, above all, how to protect themselves against it. With solutions that work, clear prices and a proven protocol.<\/p>\n<h2 id=\"migration-des-punaises-de-lit-par-l-exterieur-comprendre-le-risque-en-ete\">Bedbug migration from outside: understanding the risk in summer<\/h2>\n<p>First, a figure: between June and September, our operations in Brussels increased by 40 %. This is no coincidence. Summer combines all the right factors for transmission from one apartment to another. Windows are left open at night to keep cool, high temperatures speed up the bedbugs' reproduction cycle (a female lays up to 5 eggs a day), and the insects are simply more active when it's hot.<\/p>\n<p><img decoding=\"async\" class=\"max-w-full h-auto rounded-md\" src=\"https:\/\/nghaeknymynesecnqcmd.supabase.co\/storage\/v1\/object\/public\/article-images\/article-1773856773703-punaises-de-lit-par-la-fenetre-risques-et-solutions-a-bruxelles.png\" alt=\"Bedbugs through the window: Risks and solutions in Brussels\" title=\"\"><\/p>\n<p>So how does it work in practice? Bed bugs are lucifuges: they hate light and move around in the dark. At night, when a colony becomes too dense in a dwelling, certain individuals migrate. They follow vertical surfaces: exterior walls, fa\u00e7ade joints, window frames. Window frames are a highway for them. Cracks in plaster, damaged silicone joints, the slightest gap is enough for them. We're talking about an adult insect that measures 5 to 7 mm and can flatten out to fit through a one-millimeter gap.<\/p>\n<p>Where do bedbugs hide during the day? Wherever it's dark and cramped. Behind baseboards, in mattress seams, under peeling wallpaper. But also in roller shutter casings, window frames, cracks between frame and wall. It's precisely through these areas that they enter from the outside. A half-open window with a blind down is an invitation.<\/p>\n<p>Be careful not to confuse the species. In summer, you may also see insects in windows that are not bedbugs. The <strong>diabolical bug<\/strong> (Halyomorpha halys), for example, is a grayish-brown flying insect that seeks out the warmth of dwellings in autumn. It smells bad when crushed, but doesn't bite humans. Visit <strong>bat bugs<\/strong>, These are very similar to conventional bedbugs, and can also enter through windows, especially if bats are nesting under your roof. If you find insects near your windows in summer, the first step is to correctly identify the species before panicking.<\/p>\n<p>The real bed bug (<em>Cimex lectularius<\/em>) can be recognized by its oval, flattened shape, its reddish-brown color (darker after a blood meal), and above all by its traces: small black spots on the sheets (droppings), traces of blood, translucent molts. If you see these signs near your windows or on your bedding, there's no room for doubt.<\/p>\n<p>The typical scenario in Brussels: a tenement building in Ixelles or Saint-Gilles, old apartments with cracked facades. A tenant is infested, doesn't treat (or is slow to do so), and within a few weeks, bedbugs colonize the adjacent apartments. Through stairwells, service shafts and, yes, windows. Transmission between neighboring apartments is no urban legend. It's a fact of life.<\/p>\n<h2 id=\"solutions-et-tarifs-pour-proteger-vos-fenetres-contre-les-punaises\">Solutions and prices to protect your windows against bedbugs<\/h2>\n<p>First thing to do if you suspect a risk from the neighborhood: create a physical barrier. Not in three weeks. Now.<\/p>\n<p>Visit <strong>mosquito net against bed bugs<\/strong> is the simplest and most underrated solution. But not just any mosquito net. Standard mosquito nets are too large. To block a bedbug, you need a mesh size of less than 1 mm. Mosquito nets with fine mesh (0.5 mm or less) are available in DIY stores and online. Expect to pay between \u20ac15 and \u20ac40 per window for a fixed-frame model, and between \u20ac50 and \u20ac80 for a made-to-measure roll-up model.<\/p>\n<p>Installation must be impeccable. No gaps between frame and wall, no gaps at the bottom. Bedbugs will exploit the slightest defect. If you're a do-it-yourselfer, an aluminum frame with a thin mosquito net attached by magnetic clips will do the job just fine. Otherwise, a carpenter or our team can do the job for you.<\/p>\n<p>Beyond the screen, you need to seal. Inspect each window frame for worn silicone seals, cracks in the plaster, gaps between the frame and the masonry. Use acrylic putty or silicone to fill these gaps. It's basic, but highly effective as an anti-insect barrier. One hour's work, a few euros' worth of materials, and you'll eliminate 80 % entry points.<\/p>\n<p>Do window repellents work? Let's be honest: commercial repellent sprays (based on essential oils of lavender, tea tree, etc.) have a very limited effect on bedbugs. They are not sensitive to odors in the same way as mosquitoes. Some permethrin-based products applied to frames can have a temporary barrier effect, but this is a dressing, not a treatment. If your neighbor has a colony, a window repellent won't do the trick.<\/p>\n<p>What really works is the combination of a physical barrier (fine screen + clogging) combined with a <strong>professional insecticide treatment<\/strong> preventive or curative. A technician applies a residual insecticide to areas of passage: window frames, baseboards, electrical outlets, bedheads. This product remains active for several weeks, killing bedbugs that pass through it.<\/p>\n<p>The price of bed bug treatment in Brussels varies according to surface area and level of infestation. For a studio or T1, you should expect to pay between \u20ac150 and \u20ac250 per treatment. A T2 or T3, between \u20ac250 and \u20ac400. Most serious protocols require two passages 15 days apart to break the reproduction cycle (eggs are resistant to the first treatment). Don't be fooled by low prices: an all-inclusive treatment costing \u20ac80 often involves a single pass with a product that's not very effective. And you'll have to call back in a month.<\/p>\n<p>To get rid of bedbugs around windows specifically, the four steps are: identify the species, seal the access points, fit a suitable mosquito net, and have the problem treated by a professional if the infestation is confirmed or if the risk comes from the neighborhood. In this order.<\/p>\n<h2 id=\"forfaits-d-intervention-punaisesdelitbruxelles-votre-devis-immediat\">Punaisesdelitbruxelles intervention packages: your instant quote<\/h2>\n<p>At Punaisesdelitbruxelles, we've structured our offers so that you know exactly what you're paying for before we walk through your door. No surprises, no \u00abah but that's extra\u00bb.<\/p>\n<p>Here are our current packages for a <strong>exterminator in Brussels<\/strong> specialized bed bugs :<\/p>\n<ul>\n<li>\n<p><strong>Diagnosis + visual inspection<\/strong> 50 (deducted if you are taking medication). We inspect bedding, furniture, window frames and baseboards. We identify the species and level of infestation. You leave with a clear report.<\/p>\n<\/li>\n<li>\n<p><strong>Studio \/ T1 package (up to 40 m\u00b2)<\/strong> 199 \u20ac per pass, two passes included in the standard protocol at 349 \u20ac. Professional targeted insecticide treatment, approved products, 6-week residual.<\/p>\n<\/li>\n<li>\n<p><strong>T2 \/ T3 package (40 to 80 m\u00b2)<\/strong> 279 per pass, complete two-pass protocol at \u20ac499.<\/p>\n<\/li>\n<li>\n<p><strong>Large units (80 m\u00b2 and over)<\/strong> On request: customized quotation after inspection.<\/p>\n<\/li>\n<\/ul>\n<p>Each package includes treatment of critical areas: bedding, skirting boards, sockets, and of course window frames and shutter boxes. We don't treat by halves.<\/p>\n<p>The question we are systematically asked: \u00abWhat if it comes back?\u00bb Our <strong>result guarantee<\/strong> covers a free third pass if bedbugs are still detected within 30 days of the second treatment. That's our commitment. We won't let you down between bills.<\/p>\n<p>To obtain a <strong>disinsectisation quote<\/strong>, it's fast. Call us or fill in the form on our website. We'll get back to you within 2 hours during the day. We'll ask you a few questions (surface area, type of home, signs observed, neighborhood concerned), and send you a detailed estimate by email. No commitment, no hidden costs.<\/p>\n<p>One point that's very important to us is coordination with your neighbors. If your neighbor is infested and you treat only your home, the bedbugs will come back. It's a mechanical process. We offer coordinated interventions for several dwellings in the same building, with sliding-scale rates. We can also write a technical letter to the building manager or landlord to help break the deadlock. Because the biggest obstacle is often not the budget: it's the neighbor who refuses to treat.<\/p>\n<p>Our technicians work in all the communes of Brussels-Capital: Ixelles, Saint-Gilles, Schaerbeek, Anderlecht, Forest, Molenbeek, Etterbeek, Uccle and others. Average time between your call and the intervention: 48 to 72 hours. In emergencies (massive infestation, presence of small children), we do our utmost to call the next day.<\/p>\n<p>We use only professional products approved in Belgium, applied by certified technicians. No homemade recipes, no gadgets. A rigorous protocol, products that work, and follow-up until complete resolution.<\/p>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>Yes, bed bugs can get into your windows. It's a real risk, particularly in summer, and especially in Brussels buildings where apartments are close to each other. The good news is that this risk is manageable: fine-mesh screens, crack sealing and professional treatment if necessary.<\/p>\n<p>If you have the slightest doubt, don't leave it lying around. If you spot a bedbug early, treatment is quick and easy. A colony that's been there for three months is a different story. Contact Punaisesdelitbruxelles for a diagnosis or a quote: we'll tell you what's going on, without jargon or pressure.<\/p>\n<h2 id=\"questions-frequentes\">Frequently asked questions<\/h2>\n<\/p>\n<details class=\"faq-item\">\n<summary>Can bedbugs really get in through windows?<\/summary>\n<p>Yes, it's quite possible. Although they don't fly, bed bugs are excellent climbers, able to travel several meters up a facade to reach a new dwelling. In summer, they take advantage of open windows and cracks in the plaster to migrate from a neighboring apartment to yours.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>How can you tell whether a bedbug is coming from the outside or the inside?<\/summary>\n<p>If you find individuals or traces (black spots, molts) specifically around window frames, shutter boxes or on curtains, there's a good chance they're coming from outside. A classic internal infestation first concentrates directly in the seams of mattresses and headboards.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>Is a conventional mosquito net enough to block them?<\/summary>\n<p>No, a standard mosquito net is often insufficient. Conventional mesh allows the tiny young nymphs through. For effective protection, you need to install a mosquito net with fine mesh (less than 1 mm) and ensure that the frame is perfectly airtight, with no gaps between it and the wall.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>What should I do if my neighbor has bedbugs and I'm afraid of an infestation?<\/summary>\n<p>The priority is to create a physical barrier: seal cracks in window frames with silicone and install fine screens. If the risk is high, professional preventive treatment of entry points (windows, vents, doors) is the surest way to stop migration.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>How much does an intervention in Brussels cost for this type of risk?<\/summary>\n<p>At Punaisesdelitbruxelles, our packages start at \u20ac199 for a studio. This price includes a professional insecticide treatment targeting high-traffic areas such as windows and bedding. For a complete, no-obligation diagnosis, an initial inspection is available for \u20ac50, deducted from the final treatment.<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>Can bedbugs get into your windows? 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