Termites rarely show themselves. The workers that do the damage are pale, blind and live inside soil, wood and mud tubes, so most homeowners find a termite problem through what termites leave behind. Some of those signs are certain, and some are easy to mistake for something harmless. This guide ranks the signs by how much they tell you, explains what each one looks like in the Carolinas and Virginia, and covers the look-alikes that send people into a panic for nothing.
The strongest signs: winged termites (swarmers) or piles of their shed wings indoors, mud tubes on the foundation, piers or walls, and wood that sounds hollow or crumbles when probed. The University of Kentucky says finding winged termites indoors "almost always indicates an infestation warranting treatment."
Check before you panic: flying ants look similar but have elbowed antennae and pinched waists, and swarmers coming out of a stump in the yard don't necessarily mean the house is infested. If you see any of the strong signs, get a professional inspection rather than spraying what you can see.
Termite Signs, Ranked by What They Tell You
| Sign | What it means | What to do |
|---|---|---|
| Swarmers emerging indoors | Almost always an infestation in the structure (University of Kentucky) | Collect a few in a bag, then call for an inspection |
| Shed wings on windowsills, near doors or lights | Swarmers were inside recently | Save some for identification |
| Mud tubes on foundation walls, piers, joists or walls | Termites traveling between soil and wood | Don't treat it yourself. Get it inspected |
| Hollow, soft or crumbling wood | Feeding damage, possibly old, possibly active | Inspection to find out whether it's active |
| Swarmers coming up next to the foundation, porch or patio | A "good chance" the house is infested (University of Kentucky) | Inspection |
| Small hard pellets in piles below wood | Possible drywood termites, mostly a coastal South Carolina issue | Have the pellets identified |
| Swarmers coming out of a stump or woodpile in the yard | Termites are nearby, but not necessarily in the house | Keep wood away from the house and stay alert |
1. Swarmers and Shed Wings
Swarmers are the winged reproductives a mature colony sends out to start new colonies. NC State says a colony usually takes 3 to 5 years to start producing them, so seeing swarmers indoors means a colony has been established nearby for a while. They're attracted to light, so they gather at windows and doors, then drop their wings.
When they swarm: NC State says the state's native subterranean termites swarm from late winter into September or October, usually during the day on warm days after rain. In coastal South Carolina, Formosan termites swarm on evenings from about mid-May into July and fly toward lights, so a swarm around a lamp or bathroom light at night in early summer is a different warning. On Reddit (via Google search excerpts), a Charleston resident described finding about five winged insects in the bed and toilet, all upstairs, at night, which fits that Formosan pattern.
Indoor swarmers can't hurt anything themselves. The University of Kentucky says they can't damage wood and live only about a day, so a broom or vacuum takes care of them. The colony that produced them is the problem.
Termite or Flying Ant?
Ants often swarm at the same time of year, and this is the most common false alarm. The University of Kentucky's way to tell them apart:
| Termite swarmer | Flying ant | |
|---|---|---|
| Antennae | Straight | Elbowed (bent) |
| Waist | Thick, uniform | Narrow, pinched |
| Wings | Four wings of equal size | Front wings longer than the back wings |
For more look-alikes, see flying insects mistaken for termites.
2. Mud Tubes
Subterranean termites don't travel in the open. They build shelter tubes from soil and chewed wood, usually about the diameter of a pencil according to the University of Kentucky, running up foundation walls, piers, sill plates and joists. Look in crawl spaces, garages, along the slab edge and behind stored items.
Is it active? The University of Kentucky says a tube can be broken open to look for small, creamy-white workers. An empty tube doesn't prove the infestation is over, because termites often abandon sections while feeding elsewhere. NC State notes old tubes are dry and crumbly and can leave "etching" on surfaces for years. Tubes found high on walls or ceilings can mean an above-ground colony.
Tubes can also be hidden behind drywall. In a YouTube walkthrough, attorney Tom Campbell of Campbell Law shows a trick called "shadowing": turn off the lights and shine a flashlight along the wall to catch the slight bumps of tubes underneath.
3. Damaged Wood
NC State lists the feeding signs: wood that sounds hollow when tapped with the handle of a screwdriver, wood soft enough to probe with a knife or screwdriver, and a thin, gritty gray-brown film on the surface. The University of Kentucky notes that the outer surface of infested wood usually stays intact, so damage can look fine until it's probed. The University of Kentucky describes one infestation found only when a vacuum head broke through a baseboard.
Places to check: baseboards, door and window frames, the sill plate and joists in a crawl space, and any wood near leaks or where soil, mulch or firewood touches the house.
4. Pellets: The Drywood Termite Sign
Drywood termites don't need soil and don't build mud tubes. Instead they push their droppings out of small holes in the wood. Clemson describes the pellets as about 1/16 inch long, often a salt-and-pepper mix of colors, collecting in piles like tiny stones. In South Carolina, drywood termites are most common along the humid coast. They're relatively uncommon in North Carolina and very uncommon in Virginia.
Be careful with identification. In Reddit's termite forums, people in Virginia and central North Carolina often post photos of suspected "frass" that turn out to be mouse droppings. See drywood vs. subterranean termites in the Carolinas.
Things That Usually Aren't Termites
- Flying ants, especially carpenter ants. Check the antennae, waist and wings. See carpenter ants vs. termites.
- Mouse droppings mistaken for drywood pellets.
- Swarmers from a stump or woodpile well away from the house.
- Water damage or wood rot on its own. It doesn't mean termites, but damp wood attracts them, so it's worth an inspection.
What to Do If You Find Signs
- Don't panic, and don't rush. North Carolina's agriculture department says termites "will not cause significant structural damage in a matter of weeks." NC State says serious damage usually takes about 3 to 8 years.
- Don't spray what you see. NC State notes surface sprays kill the termites in view but don't protect the rest of the wood or the house.
- Save evidence. Put a few swarmers or wings in a sealed bag, and take photos of tubes and damage.
- Get a professional inspection to confirm the species, find how far it has spread and recommend treatment. See how often to have a termite inspection.
To check your own home step by step, see how to check for termites yourself. Our termite control service handles inspection and treatment across South Carolina, North Carolina and Virginia.
Key Takeaways
- Swarmers or shed wings indoors almost always mean an infestation.
- Mud tubes about the width of a pencil on foundations, piers or walls are the classic subterranean termite sign.
- Hollow or soft wood can look fine on the surface, so tap and probe.
- Termite or ant? Straight antennae, thick waist and equal wings mean termite.
- Act steadily, not in a panic. Damage takes years, so take time to get a proper inspection.
Frequently Asked Questions
Most homeowners first notice winged termites (swarmers) or piles of their shed wings near windows, doors or lights, or mud tubes on the foundation, piers or walls. The University of Kentucky says winged termites indoors almost always indicate an infestation that needs treatment.
Narrow brown tunnels of soil and chewed wood, usually about the diameter of a pencil, running up foundation walls, piers, sill plates, joists or walls. Breaking a piece open can show small, creamy-white worker termites, but an empty tube doesn't prove the termites are gone.
Termite swarmers have straight antennae, a thick, uniform waist and four wings of equal size. Flying ants have elbowed antennae, a narrow pinched waist and front wings longer than the back wings.
NC State says native subterranean termites swarm from late winter into September or October, usually on warm days after rain. Formosan termites in coastal South Carolina swarm on evenings from about mid-May into July and are attracted to lights.
Almost always. The University of Kentucky says swarmers emerging indoors almost always indicate an infestation. Swarmers coming out of a stump or woodpile in the yard don't necessarily mean the house is infested, but swarmers emerging next to the foundation, porch or patio mean there's a good chance it is.
Wood that sounds hollow when tapped, wood soft enough to probe with a screwdriver, and a thin, gritty gray-brown film on the surface, according to NC State. Because the outer surface usually stays intact, damage can look normal until it's probed.
Small hard pellets about 1/16 inch long, often a salt-and-pepper mix of colors, collecting in piles like tiny stones below the wood. Drywood termites are mostly a coastal South Carolina issue. Mouse droppings are a common look-alike, so have them identified.
No. The swarmers themselves can't damage wood and live only about a day, so a broom or vacuum takes care of them. The colony that produced them is what needs treatment.
Don't panic or rush, and don't just spray what you can see. Save a few swarmers or wings in a bag, photograph tubes and damage, and get a professional inspection. Termite damage builds over years, not weeks, so you have time to get it done right.
Sources: M. F. Potter, "Termite Control: Answers for Homeowners", University of Kentucky Entomology ENTFACT-604; P. Alder and C. Hayes, "Termites: Biology and Control", NC State Extension; P. A. Zungoli and E. P. Benson, "Drywood Termites", Clemson Cooperative Extension HGIC; Clemson Cooperative Extension, Formosan subterranean termite guidance; NCDA&CS Structural Pest Control, A Homeowner's Guide to Termite Control Service Agreements and Warranties; TermiteTom (Campbell Law), "Proper Termite Inspections", YouTube; homeowner accounts from Reddit (via Google search excerpts).
Photo credits: NY State IPM Program at Cornell University, CC BY 2.0, via Wikimedia Commons; Jim Conrad, Public domain, via Wikimedia Commons.