Pests in the Walls: What That Scratching Sound Might Mean

It usually starts late at night. You’re winding down, the house is quiet—and suddenly, you hear it. A soft scratching sound in the wall. Then again. And again.

It’s not your imagination. That noise could be a clear sign that pests have made your walls their new home.

From rodents to insects, plenty of unwanted guests are known to take up residence behind drywall and inside crawlspaces. In this post, we’ll walk you through what that sound might mean, the most common culprits, and what steps you should take next to protect your home.

What Causes Scratching Sounds in Walls?

Scratching, scurrying, or even chewing noises inside walls typically mean a pest is active—either nesting, moving around, or trying to get in (or out). The volume and frequency of the sound can vary depending on the type and size of the pest.

Most homeowners hear these noises at night because many pests are nocturnal. The quiet of evening hours also makes otherwise faint sounds much more noticeable.

In some cases, these sounds may come and go, leading homeowners to believe the problem solved itself. But even intermittent noise can indicate pests are still inside—perhaps nesting, laying eggs, or returning during certain times of day.

Common Pests That Live in Walls

1. Mice and Rats

Rodents are the most common source of scratching sounds in walls. Mice and rats can enter through tiny gaps and make nests inside insulation, wall voids, and attic spaces. They often gnaw on wood, wiring, and even pipes—causing serious damage over time.

Telltale Signs:

• Scurrying or gnawing noises

• Droppings near baseboards or in cabinets

• Grease marks or rub lines along walls

• Sudden pet interest in certain wall areas

2. Squirrels

If the noise is louder and occurs during daylight hours, squirrels could be to blame. These agile climbers often find their way into attics or wall spaces to nest—especially in cooler seasons.

Telltale Signs:

• Heavy rustling or thumping

• Activity heard mostly in early morning or late afternoon

• Damage to roof vents or soffits

• Bits of insulation or nesting materials near eaves

3. Raccoons

Though less common, raccoons can enter wall voids or attic spaces in search of shelter. The sounds they make are typically louder and may include chittering or vocalizations.

Telltale Signs:

• Loud, thumping noises

• Entry points around the roof or chimney

• Strong, musky odors

• Overturned trash bins or tracks in your yard

4. Bats

Bats can squeeze into incredibly small spaces and often roost behind walls or in attic eaves. While they’re quiet most of the time, their fluttering or scratching can sometimes be heard.

Telltale Signs:

• High-pitched squeaking at dusk

• Guano (droppings) near entry points

• Strong ammonia-like smell

• Fluttering sounds around vents or rooflines

5. Insects (Ants, Termites, Carpenter Bees)

Insects make subtler sounds, but over time, large colonies can generate noticeable noise. Termites may make quiet clicking, tapping, or rustling sounds as they tunnel through wood. Carpenter ants and bees can also create soft scraping or chewing noises.

Telltale Signs:

• Tiny holes in walls or woodwork

• Frass (sawdust-like material) near baseboards

• Swarmers or winged insects near windows

• Warped wood or blistering paint

What to Do If You Hear Scratching in the Walls

If you suspect pests are inside your walls, don’t ignore the problem. Many pests reproduce quickly and can cause structural or electrical damage the longer they stay hidden.

Here’s what to do:

1. Don’t open the wall yourself. Cutting into drywall could release pests or contaminate your home.

2. Listen for patterns. Note the time of day, location, and type of sound. This helps professionals identify the likely culprit.

3. Inspect outside. Look for possible entry points—damaged vents, gaps in siding, or holes around utility lines.

4. Check for other signs. Look for droppings, stains, or chew marks around walls, outlets, or air vents.

5. Call a professional. A pest control specialist can perform a safe, thorough inspection to confirm what you’re dealing with.

How Specter Pest Control Handles Wall-Dwelling Pests

At Specter Pest Control, we specialize in identifying and treating hidden pest problems—including those that live behind walls. Our process includes:

• Comprehensive inspections of interior and exterior structures

• Targeted treatment plans that safely eliminate pests without unnecessary demolition

• Sealing and exclusion techniques to prevent future entry

• Follow-up support to ensure pests don’t return

We understand how unsettling it can be to hear something crawling behind your walls. That’s why we take a calm, methodical approach—giving you real answers and effective solutions without the scare tactics.

Whether it’s rodents chewing on wires or termites tunneling through studs, we have the tools and training to treat the root cause and protect your home long-term.

Don’t Let the Scratching Continue

That sound in the wall isn’t just annoying—it’s a warning sign. Ignoring it gives pests time to do damage, spread, and settle in.

Ready to get to the bottom of it? Schedule your free home inspection with Specter Pest Control today. We’ll help you reclaim your space—and your peace of mind.