What Happens During a Termite Inspection in Bangkok (Step by Step)

People book a termite inspection in Bangkok for one of two reasons. Either they've seen something — a line of dried mud on a wall, a cloud of แมลงเม่า around the balcony light after the first rains, a skirting board that caved in under the vacuum cleaner — or they're about to sign for a property and want to know what they're really buying.

Either way, the question we get asked most is the same: what actually happens when the technician turns up?

This guide walks through a licensed termite inspection in Bangkok step by step. What the technician is looking at, why they're on their knees inside your wardrobe, what the moisture and activity readings mean, and what should be in your hands when they leave. Once you know what a good inspection looks like, you'll also recognise a bad one — and there are plenty of those around.

Why a termite inspection in Bangkok isn't just "a look around"

Bangkok sits on a river delta. The water table is high, the soil is clay that stays damp most of the year, and the dominant destructive termite here — Coptotermes gestroi, the Asian subterranean termite — lives in that soil and enters buildings through gaps you will never see. Its workers avoid light, travel inside sealed mud tubes, and eat timber from the inside out, leaving a paper-thin skin of paint that looks perfectly fine until you press it.

So an inspection is not a hunt for termites. You will almost never see a live termite during one. It's a hunt for evidence: moisture patterns, tubes, hollow sound, frass, damaged timber, and the conditions that invite a colony in.

Three things make the Bangkok version its own discipline:

• Monsoon humidity. From roughly May to October everything is damp, readings shift, and colonies forage harder. An inspection in August reads differently from one in January, and the technician has to account for that.
• The building stock. Condos with service shafts and pipe risers that run the full height of the tower. Townhouses built on former orchard land with old root systems and buried timber in the backfill. Older houses with teak built-ins and parquet laid on timber battens.
• Mixed construction. Concrete frames, brick infill, wooden door frames and skirting, laminate over timber battens. Termites only need the wood; the concrete is just a corridor.

If you want the seasonal context first, read the termite season warning signs — then come back here for what the inspection does about them.

Before the visit: what to do and what to leave alone

A few minutes of prep makes the inspection much more accurate.

• Don't disturb anything. If you've found a mud tube, leave it exactly as it is. Don't knock it off, don't spray it. Spraying scatters the workers, the colony seals off that route, and the technician loses the best evidence in the building. (There's a full explanation in our mud tubes guide.)
• Photograph what you saw. Especially swarmers and wings — they're often gone by morning.
• Clear access. The floor of built-in wardrobes, the cupboard under the kitchen sink, behind the washing machine, the riser cupboard if you have one. These are the first places we go.
• Tell us the history. Previous treatments, renovations, water leaks, any swarm you've noticed in the last two years.
• If you're buying, ask the seller for any previous termite treatment records: product used, date, and whether any warranty transfers.

The termite inspection step by step

Here's what a PestsRova technician actually does on site. Timings are typical for a two-bedroom condo or a three-storey townhouse; a large house with a garden takes longer.

| Step | What we do | Why it matters | Typical time | |---|---|---|---| | 1. Interview | Ask what you've seen, where, and when; check building history | Points the search in the right direction | 5 min | | 2. Exterior and ground level | Walk the foundation line, drains, AC drip points, garden beds, stored timber, tree stumps | Most colonies enter at or below ground level | 10–15 min | | 3. Entry-point mapping | Plumbing penetrations, bathroom and kitchen walls, riser cupboards, slab cracks, expansion joints | Termites follow moisture and existing gaps | 10 min | | 4. Interior timber survey | Tap and probe skirting, door frames, architraves, window frames, built-ins, kitchen carcasses, parquet, stairs | Finds hollowed timber behind intact paint | 20–30 min | | 5. Moisture readings | Meter readings on walls, floors and timber, compared against dry reference points | Elevated moisture is the strongest predictor of activity | Throughout | | 6. Activity check | Open a small section of any tube, look for live workers, fresh mud, soldiers, carton material | Separates an active problem from an old one | 5–10 min | | 7. Ceiling and roof void | Inspect accessible ceiling spaces and above built-ins | Coptotermes builds satellite nests in ceilings | 10 min if accessible | | 8. Photo record | Photograph every finding with its location | You get evidence, not just an opinion | Throughout | | 9. Debrief and proposal | Walk you through findings, explain options, write the fixed-price proposal | You decide with the facts in front of you | 10–15 min |

A few of these steps deserve more explanation.

The tapping and probing

The technician will tap along skirting boards and door frames with a screwdriver handle, listening for a change from solid to hollow. Where it sounds wrong, they'll press a blunt probe into the timber at a discreet spot. Sound timber resists. Termite-eaten timber gives way and you'll often see the galleries packed with mud. Yes, it leaves a small mark. No, it won't be anywhere visible, and it's the only honest way to confirm what's behind the paint.

The moisture readings

Subterranean termites can't survive in dry conditions for long, so they carry moisture with them and prefer routes that are already damp. A moisture meter turns that weakness into a map. A wall section reading noticeably higher than the wall next to it — behind a wardrobe, below a bathroom, around a pipe penetration — is a lead even when nothing is visible.

We take readings at reference points (a known dry wall) and compare. The absolute number matters less than the difference, particularly during the monsoon when baseline humidity is already high.

The activity check

If there's a tube, the technician opens a small section and watches. Workers repairing the break within minutes means an active colony. A dry, crumbly, empty tube might mean the colony moved on — or that it's using another route two metres away. This is also where we look for Coptotermes soldiers, which are easy to identify: a pale teardrop-shaped head that exudes a milky drop of fluid from the front when threatened.

Where the inspector actually spends time: Bangkok-specific zones

Condos: shafts, risers and the wet wall

People assume termites are a ground-floor problem. In a condo tower, the building has soil contact at the base, and service shafts and pipe risers run uninterrupted from the basement to the roof. Termites travel inside them. A unit on the 20th floor with a damp riser cupboard is a perfectly reasonable place to find a colony.

In a condo, the inspection concentrates on:

• The riser cupboard or service shaft wall, and anything wooden touching it
• The "wet wall" behind the bathroom and its shared wall with the bedroom wardrobe
• AC pipe penetrations and the drip line below them
• Balcony door frames and the threshold
• The floor of built-in wardrobes and kitchen kickboards

Townhouses on former orchard land

Large parts of eastern and southern Bangkok — the On Nut and Bang Na corridor in particular — were fruit orchards and market gardens within living memory. When those plots were filled and built over, the root systems, old fence posts and construction offcuts stayed in the ground. That's a permanent food source feeding colonies right under the slab.

If you live in a townhouse in this kind of area, the inspection pays extra attention to the rear garden strip, the carport, the party wall, and the back of the kitchen. We've written more about pest patterns in On Nut and Bang Na if you're in that zone.

Older houses and shophouses

Around Ari, Phaya Thai and the older districts, a lot of the housing stock has original teak built-ins, parquet on timber battens, wooden staircases and timber roof structures. These buildings often carry a history of partial treatments too — someone sprayed something in 2009 and nobody wrote down what. Here the inspection is slower and the ceiling void matters more.

What the readings actually mean

Your report will use a few terms. Here's the plain-English version.

• Active. Live termites observed, or fresh wet mud and repairs within the inspection window. This needs treatment.
• Recent activity. Damage and tubes consistent with the last few months, but no live termites found on the day. Usually still treated as live unless there's a documented treatment explaining it.
• Inactive / historical. Old dry damage, no moisture signal, no tubes. Worth noting for a buyer; may only need monitoring.
• Conducive conditions. Nothing found, but the building is offering termites an invitation: timber on soil, a leaking AC drain onto a wooden frame, a garden bed piled against the wall above the slab line.

One thing to be clear about: "no activity found" does not mean "no termites". An inspection can't see inside concrete, behind tiles, or under fitted flooring without lifting it. A good report says exactly which areas were inaccessible and why, rather than pretending to certainty it doesn't have.

What you should be holding when the technician leaves

This is where a licensed inspection differs from a free sales visit. You should receive:

• A photo report with every finding labelled by location
• Moisture and activity readings by area, including reference points
• A list of conducive conditions and what to change
• A written, fixed-price proposal if treatment is recommended: the method, the scope, the price, the timeline and the guarantee

At PestsRova, a licensed termite inspection is ฿990, and it's free with any year package. Full termite programs — a Termidor HE soil barrier or an Exterra baiting installation — typically run ฿5,000–15,000 depending on the structure and the method, and we quote them in writing after the inspection, never before. Termites are the one exception to our flat-price-by-home-size model, precisely because a quote given before anyone has looked at the building is a guess. Annual monitoring is free on packages. The full breakdown is on our pricing page, and the choice between barrier and bait is explained in soil treatment vs baiting.

How to spot a bad inspection

Plenty of "inspections" in Bangkok are a 15-minute walkthrough designed to end in a spray. Warning signs:

• No moisture meter comes out of the bag
• You're quoted a treatment price before anyone has seen the building
• The "free inspection" ends with pressure to sign that afternoon
• No photographs, or photographs that aren't shared with you
• The recommendation is to spray the visible termites (this spreads the colony, it doesn't kill it)
• Nothing is put in writing
• Nobody mentions conducive conditions or asks about leaks
• The technician never opens a wardrobe or looks in the riser cupboard

Questions worth asking on the day

• Which species do you think this is, and how can you tell?
• Where do you think the entry point is?
• What couldn't you access, and does that matter?
• If you recommend a barrier, where exactly does it go and where are the gaps?
• If you recommend baiting, how many stations and how often are they checked?
• What's covered by the guarantee and for how long?
• What do I need to fix on my side (leaks, drainage, timber contact)?

A technician who can answer these plainly is someone you can work with. All PestsRova lead technicians speak English, and we're happy to explain anything twice.

After the inspection

If activity is confirmed, treatment is usually scheduled within a few days, and the proposal will tell you what to expect on the day — where drilling happens for a soil barrier, or where stations go for baiting. If nothing active is found but conditions are conducive, you'll get a short list of fixes and a suggestion for monitoring. Either way, an annual check is the sensible rhythm in Bangkok, ideally before the swarm season starts.

Book a licensed termite inspection through our termite control page, or message us on LINE (@pestsrova) or WhatsApp with your photos and we'll tell you honestly whether you need one. We're open daily 8:00–20:00 across all BTS and MRT zones, and every visit ends with a photo report — no guesswork, no surprise invoices.