Subterranean termites can damage timber while remaining out of sight, so the absence of a swarm does not rule out an infestation. Mud tubes on a foundation, hollow-sounding wood or wings near a window are reasons to investigate, but none alone confirms active termites. Avoid disturbing the evidence or spraying an unidentified insect. Record what you have found and arrange an inspection if the signs are credible, especially where structural timber may be affected. The right treatment depends on confirming the pest, locating its routes and assessing the building. A written treatment plan also helps you compare coverage, follow-up and costs before you commit.
Subterranean termites usually stay hidden in soil, timber or protected spaces. They may reach a building through cracks, joints or other concealed routes, so activity is not always visible on the surface. Look for several clues together rather than relying on one symptom.
Some subterranean termites build visible shelter tubes; others may use concealed spaces. A lack of tubes on an exposed foundation therefore does not establish that the building is clear. In New Zealand, local termite risk and available treatments can vary. Ask a local pest professional to identify any suspected termites rather than assuming advice or products intended for another region apply to your home.
Winged ants and termites are sometimes mistaken for one another. Termite swarmers typically have a broad waist, straight-looking antennae and two pairs of wings of similar length. Ant swarmers usually have a pinched waist, elbowed antennae and front wings longer than the hind wings. These are useful clues, not a substitute for identification: damaged insects or shed wings can be hard to assess.
Wood damage is also not conclusive. Moisture, fungal decay and other insects can weaken timber or affect paint and flooring. If you find a specimen or shed wings, take a clear photograph and, if practical, keep a sample in a sealed container for the inspector. Record where and when you found it. A professional can assess the insect and inspect likely entry points before recommending treatment.
A surface spray is not a reliable way to control subterranean termites: it may kill insects it contacts without reaching concealed routes or the colony. Avoid applying products unless the pest professional advises it and the product is suitable for that use. Don’t cover up damaged timber or begin repairs until the inspection and treatment plan account for the suspected activity.
Treatment should respond to the building, the confirmed termite type and the evidence of activity. A method that suits an accessible foundation may not suit a home with difficult access, extensive paving or concealed entry routes. The table compares common approaches; it is not a substitute for a site-specific assessment.
| Approach | How it works | Main advantage | Limitations to discuss |
|---|---|---|---|
| Soil-applied termiticide treatment | A suitable product is applied to soil in targeted areas around or beneath the building to create a treated zone. | Can address routes between the colony and the structure across the treated areas. | Coverage depends on site access, soil and construction. Paving or other barriers may affect the work, and application can involve drilling or trenching. Ask what must be moved or reinstated. |
| Bait stations | Stations are placed where termite activity can be monitored; bait is used as part of a managed control programme. | Can be useful where a soil treatment is unsuitable or where ongoing monitoring is part of the plan. | Requires inspection and maintenance. Results may take time, and performance depends on termite activity and the monitoring plan. |
| Localised treatment of timber or voids | Product is applied to an accessible infested area or a route identified during inspection. | May be appropriate for a clearly defined, accessible area and can form part of a broader plan. | May not reach concealed routes or the colony. Ask what evidence supports treating only that area and how activity elsewhere will be checked. |
| Exclusion, repairs and moisture management | Entry points, timber-to-soil contact, leaks or damaged components are addressed where appropriate. | Reduces conducive conditions and can help protect repaired parts of the building. | Repairs and prevention measures alone do not confirm that active termites have been controlled. |
Soil treatment may suit a building where the pest professional can identify and treat likely access routes. Baiting may be worth discussing when access or site conditions make a continuous treated zone impractical, but it requires a monitoring commitment. Localised treatment can be useful as part of a plan, yet it is a limited choice if the extent of activity is unknown. Repairs and moisture control support termite management; they should not be presented as a stand-alone cure for a confirmed infestation.
Ask the contractor to explain why the recommended method fits your building and what alternatives were considered. If a quote proposes several methods, ask whether they address different parts of the problem or overlap. Confirm what happens if activity continues, how follow-up is arranged and whether monitoring or repairs are charged separately.
There is no useful one-size-fits-all price for termite work. The cost depends on factors such as the size and layout of the building, access to foundations or voids, the extent of suspected activity, the treatment method and any work needed around paving or landscaping. Repairs to damaged timber may be separate from pest treatment.
Compare written quotes by scope, not just by the headline total. A lower quote may cover a smaller area or omit monitoring, while a more expensive proposal may include work that is not necessary for your situation. Ask each provider to clarify:
Ask the provider to identify any assumptions in the quote, such as access to a crawl space or removal of stored items. Before accepting, check the proposed treatment against the inspection findings and ask for any exclusions to be stated plainly. Where treatment products or qualifications are subject to local requirements, confirm that the provider meets the requirements applicable to your area.
Prevention cannot guarantee that termites will never reach a building, but good maintenance makes conditions easier to monitor and can reduce avoidable risks. Keep timber, stored wood and building debris from direct contact with soil where practicable. Maintain drainage, repair leaks and address persistent dampness. Ensure landscaping or stored materials do not conceal the foundation or block access needed for inspection.
Mulch and garden beds do not, by themselves, prove termite activity. However, dense ground cover or piled materials can hide tubes and make inspection more difficult. Keep an accessible view of vulnerable areas where possible, and avoid changing drainage or blocking building openings in an attempt to create a barrier. If a professional identifies a specific risk around your home, ask for a practical correction that does not create a new moisture or ventilation problem.
After treatment, follow the service provider’s instructions for inspections and maintenance. Keep records of the inspection, treatment locations and any follow-up visits. If new tubes, wings or fresh timber damage appear, photograph them and contact the provider rather than assuming the earlier treatment has failed or repeating a DIY application.
Yes. Swarming is only one possible sign, and it may not be observed even when termites are active. Mud tubes, damaged timber or other evidence can justify an inspection without a swarm.
No. Photograph it and leave it in place if possible so the inspector can assess its location and condition. Removing a tube does not control termites and may remove useful evidence.
No. Pest treatment and structural repair are separate tasks unless the written quote specifically includes both. Have the damage assessed and coordinate repairs with the treatment plan so that access and monitoring are not compromised.
A household spray may affect insects it directly contacts but is unlikely to reach concealed routes or the colony. Avoid spraying before identification and follow any product label; ask a pest professional what, if anything, is appropriate for the specific site.
Ask the provider to define the monitoring or follow-up process before treatment begins. The signs and checks used will depend on the method, the building and the evidence found during inspection; a written plan makes it clearer what to report and when.
If you find possible subterranean termite signs, document them, avoid disturbing the area and arrange an identification before choosing a treatment. Compare proposals by their coverage, limitations, follow-up and repair exclusions. A method suited to the confirmed activity and the building is more useful than a quick surface treatment or a quote that leaves those details unclear.
