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Ants

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Ants are the most common reason an Australian household calls a pest controller, and also the one where identification changes everything. A trail of small black ants across a kitchen bench is a nuisance with a straightforward answer. A nest of imported fire ants in a south-east Queensland backyard is a biosecurity matter handled by a government eradication program, not a job for a private treatment.

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For the ordinary species, the thing to understand is that the ants on the bench are foragers, and there may be thousands more where they came from. Killing the ones you can see achieves nothing except a clean bench for an hour. The colony is what matters, and the way to reach it is to let the foragers carry something back, which means resisting the urge to wipe the trail away before anyone has looked at it.

Ants also do something more useful than annoy you: they tell you about the building. A trail coming out of a wall in the same place every summer usually means there is moisture in that wall, and ants nesting in a wet bathroom stud is a plumbing problem wearing an insect costume. Treat the ants and ignore the cause, and you will be doing this again next year.

The ant problems Australian homes actually have

  • Small dark ants trailing to food on benches and in pantries, which is a foraging problem solved with bait rather than spray.
  • Ants nesting in wall cavities, subfloors and wet areas, which is a moisture problem that happens to have ants in it.
  • Ants in pavers, driveways and garden beds pushing sand up between joints, which is a landscaping nuisance more than a household one.
  • Large ants with a painful sting in lawns and garden edges, which are a real problem for children and for anyone with an allergy.
  • Ants farming scale and aphids on citrus and ornamentals, where the ants are defending a food source rather than seeking yours.
  • Imported fire ants in the parts of Queensland where they occur, which are a biosecurity matter and not an ordinary pest job.

The ant you report instead of treating

Red imported fire ants are a declared biosecurity concern in Queensland and are dealt with through a dedicated government program with its own movement controls and treatment operations. If you think you have found them, the first call is to the Queensland Government's fire ant program rather than to a pest control company, because a private treatment on a suspected nest can disperse a colony and destroy the evidence the program needs.

There is a second reason to be careful, which has nothing to do with the law. Fire ants sting aggressively and in numbers when a nest is disturbed, and a nest looks like nothing much until somebody stands on it. Do not dig it, hose it or pour anything on it while you wait for advice, and keep children and pets away from it.

Other states have their own biosecurity arrangements and their own lists of invasive ants, so if you are outside Queensland and something looks unfamiliar and aggressive, ask your own state's agriculture or biosecurity department before anyone treats it.

Reading the trail before you wipe it away

  • Follow the line to where it enters the building; the entry point matters far more than the destination.
  • Note whether the ants are carrying something back, which tells you the bait type they will accept.
  • Check whether the trail appears at the same time of day, since many species forage on a schedule.
  • Look at where the trail emerges outside — a weep hole, a slab edge, a paver joint or the base of a tree.
  • Photograph a few ants next to something for scale before you clean, because identification is easier from a photo than from memory.
  • Watch for winged ants indoors in warm weather, which indicate a mature nest close by rather than a passing forager.

Why baiting beats spraying a foraging colony

A surface spray kills the ants it touches. Since the ants it touches are a tiny fraction of a colony that is mostly underground or inside a cavity, the visible result is immediate and the actual result is close to nothing. Worse, some species respond to a disturbance by splitting the nest, which turns one problem into several.

Baiting works the other way around. The bait is chosen to match what the colony is currently collecting — sweet, protein or oil-based — and the foragers carry it home and distribute it. It looks like nothing is happening for a few days, which is the point at which most people give up and reach for the spray, undoing the work. A technician who explains that delay before starting is doing the job properly.

The one thing that reliably ruins a baiting programme is cleaning the trail with a strong detergent or spraying around the bait. Leave the trail alone, keep other food off the bench, and let the ants do the delivery.

When ants are telling you about the building

  • A trail emerging from the same bathroom wall every summer usually points to a leaking shower or waste connection.
  • Ants in a subfloor often mean poor ventilation and damp soil rather than anything about the kitchen.
  • Nests in a window reveal or door jamb suggest water is getting behind the flashing.
  • Ants working in an external wall cavity can be reaching it over a garden bed built up above the slab edge.
  • Heavy ant activity around an air-conditioning unit often traces back to condensate discharging against the wall.
  • Ants following a service penetration into a cabinet indicate a gap that other pests will use later.

Making the kitchen a poor proposition next season

  • Store sugar, honey, pet food and anything oily in sealed containers rather than in opened packets.
  • Wipe benches and the floor under the bin at night, because foraging is heaviest when the kitchen is quiet.
  • Seal the gaps around pipes and cables where they pass through cabinets and external walls.
  • Keep mulch, pot plants and garden beds back from the wall so nests do not sit against the building.
  • Deal with scale and aphids on citrus near the house, which removes the reason ants are patrolling the branches.
  • Fix small leaks promptly; a permanently damp stud is a nest site that no bait programme can compensate for.

Ants: frequently asked questions

Why do the ants come back a week after I spray?

Because spraying reaches foragers, and foragers are the small, replaceable part of a colony. The queen and the brood are somewhere you cannot see, usually underground, inside a wall cavity or beneath a slab, and they keep producing replacements. Some species also respond to being sprayed by splitting into several nests, which is why a spray can genuinely make the problem worse. Bait is slower and less satisfying, but it is carried back to the part of the colony that actually matters.

I think I have found fire ants. What should I do?

Leave the nest completely alone and contact the Queensland Government's fire ant program before anyone treats it. Do not dig it, hose it, or pour anything onto it: disturbing a nest disperses the colony, can destroy the evidence needed to confirm the identification, and provokes a large number of stings from an ant that stings aggressively when its nest is threatened. Keep children and pets well away in the meantime, and if you are outside Queensland, contact your own state's biosecurity or agriculture department instead.

Should I clean the ant trail before the technician arrives?

No. The trail is the most useful piece of evidence in the house. It shows where the ants are entering, which direction they are travelling, what they are collecting and roughly how big the colony is, and a technician can place bait far more effectively with it than without it. Move food off the bench by all means, but leave the trail itself and the entry point undisturbed, and resist the urge to spray around it while you wait.

Are ants in the wall damaging the house?

Ordinary household ants do not eat timber the way termites do, but ants nesting inside a wall are still worth taking seriously for two reasons. They usually chose that spot because it is damp, so their presence is a signal that water is getting somewhere it should not. And some species will excavate soft or decayed timber to enlarge a nesting space, which makes an existing moisture problem worse. If ants keep appearing from the same wall, the question to ask is about the plumbing and the flashing, not just about the ants.

Do I need a licensed technician for ants?

If you are paying somebody to apply pesticide, yes. Pesticide application for a fee or reward is licensed by each state and territory through its own regulator, and the licence should be current and produced on request. For a small foraging trail, a properly labelled retail bait used exactly according to its label instructions is a legitimate first step, kept well away from children and pets. Where the problem is recurrent, structural or involves an ant you cannot identify, the identification alone is worth the call-out.

Sources

  1. Business Queensland: Fire ants
  2. Service NSW: Apply for a pest management technician licence

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the cost of ant control

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Type of pest or animal
  • How widespread the problem is
  • Size of the home and number of units affected
  • Treatment method
  • Number of follow-up visits
  • Exclusion work, such as sealing gaps or installing barriers

How to compare exterminators before you hire

  • Choose a company that inspects first and identifies the pest before recommending treatment.
  • Ask whether they are licensed to apply pest control products in your area.
  • For wildlife like raccoons, squirrels or birds, look for a company that uses humane removal and seals entry points.
  • Ask how they'll keep children, pets and food safe during and after treatment.
  • Get the treatment plan in writing, including follow-up visits and what happens if the problem comes back.

Questions to ask exterminators before you hire

  • What pest do you think this is, and how did you identify it?
  • Are you licensed to apply pest control products in my area?
  • What products or methods will you use, and are they safe around children and pets?
  • How do I need to prepare my home before treatment?
  • How many visits are included, and what happens if the problem comes back?
  • Will you seal entry points so the problem doesn't return?

When to call a pro for ant control

  • Droppings, gnaw marks or scratching noises in walls or the attic
  • Bites or small blood spots on bedding that could point to bed bugs
  • A wasp or hornet nest near a door, deck or play area
  • An animal living in the attic, chimney or under a deck

Ant control permits and local rules

Some ant control work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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