How Do I Know If My Home Has a Termite Infestation?

How Do I Know If My Home Has a Termite Infestation?

Termites cause billions of dollars in structural damage across the United States each year — and most of that damage occurs before homeowners realize there's a problem. In South Carolina, North Carolina, and Virginia, where warm temperatures and humidity create nearly ideal termite conditions year-round, early detection is your most important defense. Here are the key signs to look for and where to find them.

1. Mud Tubes on Your Foundation or Walls

Mud tubes are the most reliable field sign of subterranean termites — the most common and destructive type throughout the Carolinas and Virginia. Subterranean termites need moisture to survive, so they construct pencil-width earthen tunnels from the soil to the wood they're feeding on, protecting themselves from drying out as they travel.

• Where to look: Exterior foundation walls, piers and posts in crawlspaces, basement walls, and any wood that comes close to soil.
• What they look like: Narrow mud channels — about the diameter of a pencil — running in roughly straight lines up a surface.
• Test them: Break a tube open. If you see small, creamy-white insects inside, the colony is actively foraging. Even an empty tube is worth reporting — termites often build new tubes nearby.

2. Hollow-Sounding or Visibly Damaged Wood

Termites eat wood from the inside out, leaving only a thin outer shell — sometimes just the paint — intact. By the time surface damage appears, the interior can already be extensively hollowed out.

• The tap test: Knock on wood trim, floor joists, door frames, and baseboards. Termite-damaged wood produces a hollow, papery thud instead of a solid sound.
• Blistering or bubbling paint: Termites produce moisture as they tunnel, which can cause paint to bubble on walls and trim before surface damage is visible.
• Soft spots in floors or sticking doors: Structural damage in subfloor joists can make floors spongy; a door or window that suddenly sticks may signal framing distortion from termite damage.

3. Swarmers and Discarded Wings

Swarmers (alates) are the reproductive termites that leave a mature colony to start new ones. Seeing a swarm — or its aftermath — confirms an established infestation nearby.

• Eastern subterranean termites swarm on warm days after spring rains, from February through May in SC and NC, and into June in VA.
• Formosan subterranean termites (common in coastal SC) swarm at dusk in May and June and are strongly attracted to lights.
• Discarded wings: Swarmers shed their wings immediately after landing. Small piles of equal-length wings on windowsills, near exterior doors, or at the base of interior walls are often the only visible sign of a recent swarm.
• Termite swarmers are often confused with flying ants — termites have straight antennae, equal-length wings, and a broad waist, while flying ants have elbowed antennae and a pinched waist.

4. Frass (Drywood Termite Droppings)

If you find small piles that look like coarse sawdust or coffee grounds below a wood surface, you may be seeing drywood termite frass. Drywood termites push their fecal pellets out of tiny kick-out holes in infested wood. The pellets are roughly 1mm, six-sided, and light to dark brown depending on the wood species.

Drywood termites are most active in coastal SC and coastal VA and leave no mud tubes — frass is their only visible field sign. For a full side-by-side breakdown, see our drywood vs. subterranean termite comparison.

5. Check Your Crawlspace and Attic

The areas homeowners see least often are the ones termites exploit most. Many active infestations are first found during professional crawlspace and attic inspections. Check your crawlspace at least twice a year, looking for mud tubes on piers, joists, and sill plates at the foundation.

What to Do If You See Any of These Signs

Don't clean up mud tubes or frass before your inspection — this evidence helps technicians confirm the species and assess activity level. Photograph what you find, note the location, and schedule a professional inspection promptly. The difference between catching an infestation at one year versus three years can be thousands of dollars in structural repairs.

Read More: Do Termites Cause Expensive Damage?  |  Termite Warning Signs Every Homeowner Should Know

If you suspect a termite problem in your SC, NC, or VA home, contact Vinx Pest Control for a professional inspection. Our technicians use moisture meters and thorough structural assessments to find what visual checks alone can miss — and we'll give you a clear picture of exactly what's happening and what it takes to fix it.