Of all home problems, termites are among the most feared because they work silently behind walls, under floors and in roof structures. By the time owners notice, a door frame may be hollow enough to push a finger through, a run of built-in cabinets ruined, or books eaten down to their covers. The rainy season is peak termite activity: damp soil helps colonies expand, and it is when alates — the winged reproductive stage — leave the nest to found new colonies. This guide helps you spot the signs early, choose the right treatment and prevent problems from the start.
Most damaging termites in Thai homes are subterranean. They nest in soil, need constant moisture, and build mud tubes up walls, posts, skirting and pipes to travel between nest and food without exposure to air. A pencil-thick earthen line running up a wall or into a corner is the clearest sign. Others include wood that sounds hollow when tapped, paint or wallpaper bubbling in lines as if something is underneath, piles of shed wings on windowsills or under lights after rain, and fine soil debris along floor joints.
What you should never do is spray insecticide or knock the mud tubes away immediately — the termites scatter and reroute to places you can't see, making treatment harder. Photograph the spot, leave it alone and call a pest-control company to survey.
| Method | Principle | Pros | Limits |
|---|---|---|---|
| Soil treatment | Chemical barrier in the soil around the house | Fast, broad protection | Requires drilling floors; efficacy fades, needs repeating |
| Bait system | Stations around the home; termites carry the active ingredient back to the colony | Eliminates the source; less chemical use | Takes weeks to months; stations need regular checks |
| Pipe treatment | Pipes laid under the slab during construction; chemical topped up later | Re-treat without drilling | Only possible during construction |
| Spot treatment | Injecting affected wood or tubes | Immediate local fix | Doesn't reach the colony; termites often return |
For active infestations, most companies recommend a bait system to destroy the colony attacking the house plus soil treatment for a long-term barrier. For homes without problems, annual inspection and periodic soil treatment suffice.
Prices vary widely with house size, method and warranty length. Before signing, confirm the contract states the chemicals used and their registration, the number of inspection visits per year, warranty period and free re-treatment if termites return, and responsibility for tiles broken during drilling. Good companies survey on site before quoting and can explain where termites are entering — rather than quoting instantly by phone.
Building a new home or extending a rear kitchen is the most cost-effective moment to protect against termites: treat the soil before pouring the slab, lay injection pipes under the floor along the ground beams, and use treated timber or termite-resistant materials for frames and structure. Extensions are the most common entry point, because their floors often settle separately from the main house and open a gap — an ideal doorway.
Mosquitoes: breed in small pools around the home — plant saucers, sagging gutters, old tyres. Empty containers, change vase water weekly and fit insect screens, the best-value investment. Ants: move indoors to escape heavy rain; store food in sealed containers and use bait rather than sprays. Cockroaches: come up through drains; fit insect-proof drain covers in bathrooms and kitchens and seal gaps around pipes through walls.
Not necessarily; alates are drawn to lights from outside. But many shed wings repeatedly in the same place, or swarmers emerging from floor or wall cracks, suggest a nest close to the building. Get a professional inspection.
Yes, especially lower floors and units with lots of built-in timber; termites can travel up service shafts. Inform the juristic person, as the whole building may need treatment.
Absolutely. Have an inspector or pest company survey before committing, especially homes with timber roof frames, wooden floors or extensive built-ins — damage can hide behind fresh paint.
Termites are preventable if you know the signs and act quickly. Be especially watchful in the rainy season; when you find mud tubes or swarmers, stop and call a professional, choose treatment that reaches the colony, and if you are building, install protection before the slab is poured. More home-care guides are on the MyProperty blog.
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