Termite Detection: The Seven Signs Every Homeowner Should Know

Termite damage in India exceeds ₹2,500 crore annually, and the single largest contributor is late detection. The subterranean termite species most common in Hyderabad, Chennai and Bangalore — Odontotermes obesus and Coptotermes heimi — work inside wood, behind paint, and beneath flooring. By the time mud tubes appear on visible surfaces, the colony has been feeding for an average of 8 months. The good news: termites leave traces long before that. You just need to know where to look.

Sign 1: Hollow-sounding timber

Tap wooden door frames, window sills, and skirting boards with the handle of a screwdriver. Healthy timber produces a sharp, dense sound. Termite-damaged wood — even when the surface looks intact — produces a dull, papery thud. This happens because termites consume cellulose along the grain, leaving a thin outer shell that hides extensive internal damage. Test skirting boards at floor level first; termites typically enter from the soil and work upward.

Sign 2: Discarded wings near windows and light sources

Once a year (typically after the first monsoon rain), termite colonies release alates — winged reproductive termites — to start new colonies. These swarmers are attracted to light and shed their wings within hours of landing. If you find tiny, translucent wings (about 8–10mm long) piled near window sills, door thresholds, or light fixtures, a mature colony is within 50 metres of your home. This is the single most common early-warning sign that homeowners miss.

Sign 3: Mud tubes on foundation walls

Subterranean termites cannot survive in dry air. They build pencil-thin mud tubes — made of soil, saliva, and faecal matter — to travel between their underground colony and their food source inside your home. Check the exterior foundation, especially where soil meets the wall, and along interior walls at floor level. Also check around pipe entries and cable conduits. A tube doesn't guarantee active infestation, but it does mean termites have explored this route — and may still be using it.

Sign 4: Buckling paint or bubbling wallpaper

When termites feed just below a painted or wallpapered surface, they introduce moisture that lifts the surface finish. The result looks similar to water damage — slight bubbling, faint discolouration, paint that flakes without obvious cause. The difference: water damage typically follows a leak pattern (under a pipe, near a window). Termite damage appears in linear tracks along the grain of underlying wood. If you see this, probe gently with a thin blade — if the wood beneath gives way, termites are likely active.

Sign 5: Tight-fitting doors and windows

Termites introduce moisture into door and window frames as they feed. The wood absorbs this moisture and expands, causing doors and windows to stick. This is often misattributed to seasonal humidity. The diagnostic test: if a door that stuck during monsoon still sticks in November (well after wood should have dried), termites are the more likely cause. Open the frame edge and look for granulated wood residue or live workers.

Sign 6: Frass — the pellet clue

Drywood termites (less common than subterranean in South India, but present in coastal Chennai) push their droppings out of small kick-out holes. The result is a tiny pile of what looks like coarse sand or pepper — six-sided pellets about 1mm long. If you find these piles on floors, sills, or beneath wooden furniture, the infestation is drywood termites and requires a different treatment protocol than subterranean species.

Sign 7: Sagging floors or ceilings

This is late-stage. Floor boards that flex more than they used to, slight sagging in door lintels, or visible dipping in ceiling beams all indicate structural timber loss. By this point, the infestation has been active for 18–36 months. Repair costs escalate sharply. If you notice this, schedule an inspection within 48 hours — do not wait.

When to call a professional

If you identify any one of signs 1–3, schedule an inspection within 2 weeks. If you identify any of signs 4–6, schedule within 7 days. If sign 7 is present, schedule within 48 hours. The cost of professional treatment is a small fraction of structural timber replacement after a colony has compromised load-bearing elements.

Termite prevention is significantly cheaper than termite cure. The drill-fill-seal barrier treatment, when applied correctly with a 5-year warranty, costs less per year than annual maintenance for most home appliances — and protects the single largest asset most families own.