Termites cause billions of dollars in home damage every year, and the worst part is how quietly they work — most infestations go unnoticed until the damage is done. The good news: there are clear early warning signs you can check yourself. The most common first clue is frass (termite droppings) that looks like tiny piles of sawdust or pellets, followed by mud tubes and discarded wings.
The 7 early signs of termites
- Frass (droppings): small piles of pellets resembling sawdust or coffee grounds near wood — often the very first sign.
- Mud tubes: pencil-width tunnels of dried mud on foundations, walls, or crawl spaces — subterranean termites use them to travel.
- Swarmers: winged termites (or piles of shed wings on windowsills) indicate a mature, active colony.
- Hollow-sounding wood: tap beams and frames — termites eat from the inside out, leaving a papery shell.
- Stuck windows or doors: moisture from termite activity warps wood, making frames stick.
- Bubbling or cracked paint: can mimic water damage but signal termites tunneling beneath the surface.
- Sagging or squeaky floors: weakened subflooring in advanced infestations.
A simple 5-minute DIY termite check
Grab a flashlight and a flat-head screwdriver. Tap along window frames, door frames, support beams, and any outdoor wood (deck, porch, fence posts), listening for a hollow sound. Press the screwdriver into suspect wood — if it sinks in easily or reveals tunnels, that is a red flag. Check the foundation and crawl space for mud tubes, and inspect windowsills for discarded wings, especially in spring.
Subterranean vs. drywood termites
| Subterranean | Drywood | |
|---|---|---|
| Where | Soil contact, foundations, crawl spaces | Inside dry wood — attics, furniture, framing |
| Tell | Mud tubes | Frass pellets pushed out of “kick-out” holes |
| Damage speed | Fast, large colonies | Slower but harder to detect |
When to call a professional
If you find any of these signs, treat it as urgent. Termite damage compounds, and DIY sprays rarely reach the colony. A professional inspection pinpoints the species and the extent, and proper treatment (baiting or liquid barrier) protects the structure. The cost of an inspection is trivial next to the cost of structural repairs.
Dealing with this pest right now? Get a free, no-commitment quote from vetted local exterminators in your area — most respond the same day.
Frequently asked questions
How quickly do termites damage a house?
A mature subterranean colony can cause noticeable damage within a few months to a couple of years, depending on size and conditions. Early detection dramatically limits the cost.
Are flying ants the same as termite swarmers?
No. Termite swarmers have straight antennae, equal-length wings, and a uniform waist; flying ants have bent antennae, unequal wings, and a pinched waist.
Can I treat termites myself?
Spot treatments may kill visible termites but rarely reach the colony. Reliable elimination almost always requires professional baiting or a liquid barrier.