Subterranean termite treatment: how a technician handles a ground colony
The method matters less to you than the questions you ask and what you leave alone before the technician arrives. Here is what to expect.
What a subterranean termite treatment actually is
A subterranean termite treatment is a job done by a licensed pest management technician, using a product registered by the APVMA, to stop a ground-nesting colony reaching or feeding on your house. It is not something you do. Nor is it one single method.
This page is about what the treatment involves and what to ask. Which method suits your property is the technician's call, made after an inspection.
The main ways a technician deals with a ground colony
Most professional work falls into a few approaches, and a real job often combines them. The differences matter because they work on different parts of the problem.
| Approach | What it does | What to know |
|---|---|---|
| Soil barrier | A treated zone in the ground around and under the building that termites have to cross | Only as good as its continuity; gaps and bridging undo it |
| Baiting system | Stations around the property feed a slow-acting active to foraging workers, who carry it back | Works through the colony, and needs monitoring over time |
| Non-repellent treatment | A product termites cannot detect, so they pass it on inside the colony | Depends on undisturbed activity to work |
| Physical barrier or mesh | Built in during construction to force termites into view | Cannot usually be retrofitted to an existing slab |
Brand names such as Termidor, Sentricon, Exterra and Trelona sit under those headings. They are explained here, not recommended, and choosing between them is not a shopping decision.
Why the treatment depends on the colony being left alone
This is the point most people miss. Non-repellent products and baits work because termites keep coming and carry the active back to the colony. If you have broken the tubes or sprayed the area first, the colony withdraws and re-enters elsewhere, and the transfer effect is lost.
So the most useful thing you can do before a technician arrives is nothing. Do not disturb it. Note where you saw it and when, and leave it intact.
Why a treatment is not the end of the story
A treatment deals with the activity found on the day. It does not make a house termite-proof for good. Barriers get bridged by garden beds and paving, bait stations need checking, and a new colony can find a different way in.
That is why a regular inspection to AS 4349.3 matters after the work, and why any warranty attached to a treatment usually depends on it. What a warranty actually covers is a question for the installer and your contract, not for us.
What to ask before you agree to anything
- Is the technician licensed in your state, and is the product APVMA registered?
- What did they find, and where, and how was it confirmed?
- Which approach do they propose and why that one for this property?
- What do they need you to leave undisturbed before the visit?
- What follow-up inspection or monitoring is included, and how often?
Get the answers in writing. If you are unsure about a contract or a claim, take it to a conveyancer, your insurer or the consumer affairs body in your state.
What not to do while you wait
Do not spray, do not break open a tube and do not pull trim off to look. Do not buy a retail product hoping it will do the same job. A shop spray repels, and repelling is exactly what makes a colony relocate.
Frequently asked questions
Can I treat subterranean termites myself?
No. Professional treatment uses APVMA-registered products applied by a licensed technician, and a retail spray can make a colony withdraw and re-enter somewhere hidden. The safe step for you is to leave the evidence alone and book an inspection.
Is baiting better than a soil barrier?
Neither is better in general. They work in different ways, and the right choice depends on the building, the site and what the inspector finds. A licensed technician makes that call, and some jobs use more than one method.
Does treatment mean my house is protected for good?
No. A treatment deals with the activity found at the time. Barriers can be bridged, bait stations need monitoring and colonies can find new routes, which is why regular inspection continues after the work.
What should I do before the technician visits?
Touch nothing. Do not break tubes, spray or remove trim. Write down where and when you saw the evidence, and let the technician see it exactly as you found it.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- Department of Health, Victoria. Pest control — termites
- Queensland Building and Construction Commission. Protect against termites — termite management systems and inspections
- Standards Australia. Australian Standards (AS 3660 termite management, AS 4349.3 timber pest inspection)
- Australian Building Codes Board. National Construction Code