It is the text message no one ever wants to receive. You’re sitting on your couch, relaxing after a long day, and your phone buzzes. It’s your next door neighbor. “Hey, just wanted to give you a heads up… we just found out we have bed bugs. The exterminator is coming on Thursday.”

Instant panic. Your skin starts to crawl. You immediately look down at your sofa, then at your carpet, wondering if the invasion has already begun.

If you live in a shared wall property, whether it’s a modern apartment complex, a cozy condominium, or a townhouse row. A neighbor’s pest problem can quickly feel like your pest problem. Because let’s be honest: bed bugs don’t respect property lines, and they certainly don’t care about lease agreements.

But before you run to the store to buy every chemical spray on the shelf, take a deep breath. Having a neighbor with bed bugs does not guarantee you will get them. However, it does mean you need to act quickly to fortify your living space.

As local pest control experts who deal with these stealthy hitchhikers every single day, we are going to break down exactly how bed bugs travel through walls, what you should do immediately, and how to build an invisible shield around your home to keep them out.

The Reality Check: Can Bed Bugs Actually Cross Over Walls?

Let’s answer the burning question right away: Yes, bed bugs can travel between adjacent units.

However, they don’t chew through drywall like mice or termites do. They are opportunists. Bed bugs are incredibly flat and thin, meaning they can slip through the tiniest cracks and crevices. In shared-wall environments, they typically migrate using the internal infrastructure of the building. This includes:

• Electrical Outlets and Light Switches: The hollow spaces inside your walls where wires run act like a highway system for insects.

• Plumbing Lines: Gaps around pipes under sinks, behind toilets, and near washing machines provide easy access between apartments.

• Shared Hallways: Bed bugs can literally walk out a neighbor’s front door and stroll right under yours.

• Baseboards and Floorboards: Tiny gaps where the wall meets the floor offer a perfect path from one room to the next.

When a neighbor begins treating their apartment, the sudden disruption and chemical pressure can actually cause the bed bugs to scatter, looking for a safe, quiet place to hide. If your apartment isn’t sealed, your home becomes their sanctuary.

Step 1: Establish Your Immediate Defense Protocol

The moment you find out about a nearby infestation, you need to implement a proactive defense strategy. Do not wait for the neighbor’s treatment to finish. Start these four steps today.

1. Pull Your Bed Away from the Wall: Bed bugs cannot fly or jump; they have to crawl to get to you. By pulling your bed just 6 to 12 inches away from the wall, you instantly eliminate their easiest bridge to your mattress. Make sure your blankets, sheets, and comforters do not tuck into the wall or touch the floor. Your bed should be an isolated island.
2. Install Bed Bug Encasing Covers: Go online or head to the store and purchase high-quality, zippered bed bug encasements for both your mattress and your box spring. Pro-Tip: Make sure the packaging explicitly states it is “bed bug certified.” These covers trap any bugs that might already be hiding in your bed (starving them out over time) and prevent new ones from finding a home in your mattress seams.
3. Use Interceptor Cups: Place bed bug interceptor cups under every single leg of your bed frame and couch. These are small, plastic, dual-ring dishes. If a bed bug tries to crawl from the floor up to your bed, it gets trapped in the outer well of the cup. Not only does this protect you while you sleep, but it also acts as an early warning system. If you check the cups and find a bug, you know they’ve entered your unit.
4. Minimize the Clutter: Bed bugs love clutter because it gives them thousands of tiny places to hide where predators (and pest technicians) can’t find them. Keep your floors clear of clothes, piles of magazines, and cardboard boxes. The cleaner your perimeter, the harder it is for a stray bug to hide.

Step 2: How to Physically Shield Your Walls

Now that you’ve protected your immediate sleeping areas, it’s time to seal the borders. Think of your home like a fortress—you need to close every open gate.

Seal the Electrical Outlets

Since electrical conduits are primary travel routes, you want to make them completely inaccessible.

• Remove the plastic faceplates from your outlets and light switches on walls shared with neighbors.

• Install simple, inexpensive foam outlet sealers (often used for winter weatherproofing).

• For an extra layer of protection, you can purchase plastic safety caps to plug into the outlets you don’t frequently use.

Caulk the Baseboards and Gaps

Grab a tube of high-quality silicone or acrylic caulk and a caulking gun. Inspect the common walls shared with your neighbor. Look for any visible gaps where the baseboard meets the drywall or the flooring. Run a clean bead of caulk along these lines to seal the spaces shut. Do the same around any trim, door frames, and window sills.

Close the Gaps Around Utilities

Look under your kitchen and bathroom sinks. Where the pipes pass through the wall to your neighbor’s side, there is almost always an oversized hole left by the builders. Use expandable foam insulation or silicone caulk to completely pack those gaps tightly.

Step 3: Laundry and Hygiene Sanity Checks

If you live in a building with a shared laundry room or common hallways, your risk factor goes up slightly. You need to change how you handle your fabrics temporarily.

• The High-Heat Rule: Bed bugs cannot survive extreme heat. If you suspect you’ve been exposed, throw your clothes, bedding, and washable pillows directly into the dryer on high heat for at least 30 to 45 minutes. You don’t even need to wash them first; the dry heat alone is lethal to all life stages of bed bugs, including eggs.

• The Living Room Lockdown: Keep your dirty laundry in sealed, plastic garbage bags or airtight plastic bins rather than open wicker baskets. Wash your laundry immediately when taking it out of the bags, and discard the bags in an outdoor dumpster.

When to Call in the Professionals

It is incredibly tempting to run to the nearest hardware store and buy a dozen foggers or DIY chemical sprays. Please, do not do this.

Mass market bug bombs and over the counter sprays are often repellent based. They do not kill the entire colony; instead, they simply irritate the bed bugs and cause them to dig deeper into the walls, spreading the infestation further into your home or driving them into other neighbors’ apartments.

Dealing with shared wall infestations requires a coordinated, professional touch. If you have done your best to protect your home but start noticing small rust colored spots on your sheets, discarded insect skins along your baseboards, or unexplained itchy bites waking you up in the morning, it is time to call for backup.

If you are dealing with a stressful pest situation or want a preventative inspection to ensure your home remains completely secure, visit Pest Control Del Rio to learn more about our approach. Our experienced team knows exactly how to locate hidden entry points and can implement localized, targeted perimeter defenses to keep your household safe.

Don’t let a neighbor’s bad luck ruin your peace of mind. For fast, reliable, and discreet help getting rid of unwanted hitchhikers, head over to our specialized Bed Bug Control in Del Rio to schedule a professional inspection today. We’ll help you take back your space and shield your walls for good.