Signs of Termites: 8 Warning Signs of Termite Damage
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Quick answer: The most common signs of termites are mud tubes on foundations and walls, small piles of discarded wings near windows, wood that sounds hollow when tapped, and tiny pellet-like droppings (frass) near wood. Because termites work quietly inside wood for months or years, spotting even one of these signs is reason to book a licensed inspection right away.
Termites are destructive precisely because they are hard to see, they feed on the cellulose inside structural wood, hidden from view, and a colony can cause serious damage before a homeowner notices anything is wrong. That makes recognizing the early warning signs one of the most valuable things a homeowner can learn. Here are the eight signs worth knowing, roughly in the order you are likely to encounter them, followed by a quick checklist and what to do next.
The 8 warning signs of termites
1. Mud tubes on walls or foundations
Subterranean termites, the most common and destructive type in the U.S., build pencil-width tunnels of mud and soil to travel between their underground colony and your home's wood while staying protected from the air. Look for these earthy tubes running up foundation walls, piers, crawl-space supports, and the exterior of your home. Active tubes are moist; if you break a small section and it is rebuilt within days, the colony is active.
2. Discarded wings near windows and doors
When termite swarmers leave to start new colonies, they shed their wings shortly after flying. A little pile of small, equal-length translucent wings on a windowsill, along a door frame, or on a web is a classic early sign, often the first thing homeowners notice.
3. Wood that sounds hollow or papery when tapped
Termites eat wood from the inside out, leaving a thin veneer on the surface. Tap suspect wood, baseboards, window frames, structural beams, with the handle of a screwdriver. Wood that sounds hollow, papery, or noticeably different from solid wood nearby may be damaged inside.
4. Frass (drywood termite droppings)
Drywood termites push their droppings out of small 'kick-out' holes, leaving little mounds of what looks like fine sawdust or coffee grounds, actually tiny six-sided pellets, near the wood they are infesting. Finding frass beneath a windowsill, door frame, or wooden furniture points to an active drywood colony above.
5. Bubbling, blistering, or peeling paint
Termite activity and the moisture it brings can make paint bubble, blister, or peel, sometimes looking similar to water damage. Paint that is distorting on a wall or trim with no obvious plumbing leak is worth a closer look.
6. Doors and windows that suddenly stick
As termites tunnel through frames and the moisture they introduce warps the wood, doors and windows can become tight, stiff, or hard to open and close. A door that used to swing freely and now sticks, with no other explanation, can be a sign of hidden damage in the frame.
7. Clicking or rustling sounds in the walls
Soldier termites bang their heads against tunnels to signal danger, and a large colony feeding can be faintly audible. If you press an ear to an infested wall you may hear soft clicking or rustling. It is a subtle sign, but a real one.
8. Live swarmers
Seeing the winged swarmers themselves, especially indoors, is a strong signal that a colony is active in or under the structure. Termite swarmers have a straight, broad waist, straight antennae, and two pairs of equal-length wings, which is how you tell them from flying ants. See our guide toflying ants vs. termites to be sure.
Quick termite checklist
| Location | Look for |
|---|---|
| Foundation, crawl space, piers | Mud tubes; damaged or hollow-sounding wood |
| Windows and door frames | Discarded wings; frass piles; sticking/warping |
| Baseboards and trim | Blistering or peeling paint; hollow sound when tapped |
| Attic and structural beams | Frass; galleries in wood; sagging |
| Wooden furniture and stored wood | Small kick-out holes and frass beneath |
What to do if you spot the signs
- Don't disturb the area more than needed, and don't spray retail insecticide over it, that can scatter the colony and make professional treatment harder.
- Keep evidence: photograph mud tubes, wings, or frass, and note exactly where you found them.
- Book a licensed termite inspection. A standalone inspection typically runs about $75 to $150 and is often waived if you proceed with treatment.
- Act promptly, termite damage compounds over time, so early treatment means less structural repair and a lower total bill.
Termites cause damage that most homeowners' insurance does not cover, because it is considered preventable maintenance. That makes early detection and a verified professional your real protection.
Found one of these signs?Compare license-verified termite control companies in your area and request an inspection, we verify each company's license against its state board before it's listed, so you're trusting the diagnosis to a credentialed pro.
Frequently asked questions
What are the first signs of termites?
The earliest signs most homeowners notice are small piles of discarded wings near windows or doors, mud tubes on the foundation or crawl-space walls, and tiny pellet-like droppings (frass) near wood. Wood that sounds hollow when tapped is another early tell.
What does termite damage look like?
Termite-damaged wood is often hollow or papery when tapped, with maze-like galleries inside. You may also see blistering or peeling paint, sagging floors, mud tubes on masonry, and doors or windows that stick as frames warp.
What are mud tubes?
Mud tubes are pencil-width tunnels of soil and saliva that subterranean termites build to travel between their underground colony and your home's wood while staying protected. Finding them on foundations, piers, or crawl-space walls is one of the clearest signs of an active infestation.
What is termite frass?
Frass is drywood termite droppings, tiny six-sided pellets that look like fine sawdust or coffee grounds. Termites push it out of small holes in the wood they infest, so a small mound of frass beneath a windowsill or wooden furniture points to an active colony above it.
How do I check for termites myself?
Inspect the foundation and crawl space for mud tubes, tap baseboards and wood trim for a hollow sound, check windows and doors for discarded wings, frass, and sticking, and look for blistering paint. Any of these signs warrants a professional inspection to confirm and locate the colony.
Does homeowners insurance cover termite damage?
Usually not. Most policies exclude termite damage because it is considered preventable through maintenance rather than a sudden accident. That is why early detection and regular professional inspections are the practical way to protect your home from the cost.
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