What attracts termites to a house
Nothing you own summons a colony. What your house can do is make itself the easiest thing to find and the easiest thing to reach.
What actually attracts termites to a house?
There are four things, and only three of them are yours to change. They are moisture, timber in contact with the soil and concealed routes from the ground into the building. The fourth is the colony already being in the area. You did not cause that one and you cannot remove it. Across most of Australia, subterranean termites are simply part of the ground your house is standing on.
So the useful question is not “what attracted them”. It is: of the houses within foraging distance of a colony, which one is the easiest to find, the easiest to get into unseen. And the most rewarding once they are in? That is a list you can shorten.
1. Moisture, which is the one that matters most
Subterranean termites lose water through their body wall and must stay in a humid environment. Damp soil against a building is therefore not just pleasant for them, it is a precondition for working there comfortably.
Think of a leaking tap, a hot water relief line discharging at the wall, or a downpipe that ends at the footing. An air conditioner dripping in one spot all summer does it too, and so does a garden bed watered daily against the slab edge. Each creates a permanently wet patch exactly where you least want one.
Damp also softens timber and makes it easier to eat, and it brings fungal decay along with it. The two are found together in subfloors so often that inspectors treat one as a reason to look harder for the other. This is the biggest single lever you have, and it is covered in full in moisture and the subfloor.
2. Timber sitting in the ground
A colony foraging through the soil finds timber by running into it. Anything wooden that is buried, half-buried or resting on soil is a free hit. And it lets numbers build up right beside the building before anything touches the house itself:
- Stumps left after a tree came out, which are also a classic nest site in their own right.
- Form-work never dug out after the slab was poured.
- Offcuts and scrap stored under the house or down the side.
- Firewood stacked on the ground against a wall.
- Timber retaining walls, sleepers and garden edging in soil contact.
- Fence posts and pergola posts set straight into the ground.
- Cardboard and stored paper in a damp subfloor, which is cellulose too.
3. A concealed way in
Termites avoid open air and light. If the route from soil to timber is exposed, they have to build a mud tube across it. And a mud tube on a bare wall is visible: which is exactly the point of leaving that strip of wall bare. What makes a house attractive is a route that skips the visible part altogether.
That is what bridging means. A garden bed or mulch is built up above the slab edge, a path or paving is poured over the perimeter. Or a deck is built hard against the wall. Foam cladding or render may be taken down past the line it was supposed to stop at. Or a slab penetration was never sealed.
Every one of those hands the colony a covered approach past whatever barrier the house has, and past the inspector's eyes as well. A house with a perfect barrier and a bridged slab edge is, in practice, a house without a barrier.
4. What you cannot remove
You cannot make your street less termite-prone, you cannot make a neighbouring colony go away, and you cannot change the species that live in your region. Anyone selling you a way to repel termites from a block of land is selling something that does not exist.
What is achievable is the combination that actually protects buildings: remove the conditions above, keep a managed barrier appropriate to the house. And inspect at least annually so that if they do arrive it is found early.
The explanations that do not hold up
| What people blame | What is actually going on |
|---|---|
| “Mulch attracts termites” | Mulch itself is a minor food source and not the issue. Mulch piled above the slab edge against the wall is the issue, because it hides the strip where a tube would show and holds moisture there. Keep it low and keep it back |
| “The gum tree did it” | A tree can host a nest, but most do not, and most houses with trees never have a problem. It is worth checking, not worth panicking about |
| “The neighbour got treated and pushed them onto us” | Modern non-repellent termiticides are designed not to be detected, so there is nothing to flee from. A colony was already foraging across both blocks |
| “We are fine, the house is brick” | Brick veneer is a timber-framed house with a brick skin. The frame, the roof timbers and the joinery are all on the menu, and a full masonry house still has a timber roof |
| “There is no timber touching the ground, so we are safe” | Necessary but not sufficient. They will build tubes up a pier, a pipe or a wall to reach timber that is well clear of the soil |
| “We had a treatment done, so that is dealt with” | A barrier is a managed system with a service life, not a one-off event. Untouched, it stops being a barrier without announcing it |
Where the effort pays
If you do one thing, stop whatever is keeping soil wet against the building. If you do a second, get the timber out of the ground. If you do a third, uncover the slab edge so the wall can be seen. None of that guarantees you will never have termites, because the colony in the ground was never yours to control. But it moves your house from the easiest target in the street to one of the harder ones, and it makes every inspection that follows worth more.
Frequently asked questions
Does anything actually attract termites, or do they just turn up?
Both, in a sense. A foraging colony finds things by running into them, so nothing summons them from a distance. But once they are foraging nearby, damp soil, buried timber and a concealed route into the building make your house far more likely to be the one they stay at.
Is mulch bad for termites?
Mulch on its own is not the problem. Mulch heaped above the slab edge against a wall is, because it hides the strip of wall where a mud tube would be visible and keeps that soil damp. Keep the level below the slab edge and leave a bare inspection strip.
Can I use something to repel termites from my yard?
No. There is no product that keeps termites out of a block of land, and the professional systems work in the opposite way: they are deliberately undetectable so the colony carries the active ingredient back with it. Protection comes from conditions, a maintained barrier and regular inspection.
Will killing the ones I can see stop them being attracted?
It does the opposite of what you want. Spraying or breaking open workings makes the colony abandon that route and come back somewhere concealed, and it destroys the evidence an inspector needs. Leave anything you find intact and get it looked at.
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.
- Queensland Building and Construction Commission. Protect against termites — termite management systems and inspections
- Department of Health, Victoria. Pest control — termites