Ants are coming into your house because a single foraging worker found food, almost always something sweet, and laid a scent trail back to the nest so the rest of the colony could follow it. The ants on your worktop do not live in your kitchen. They live outside, usually within a few metres of the wall, under a patio slab, in the sand beneath block paving, or in a warm pocket of soil against a south facing wall. Your house is the food source. It is not the nest.
That distinction decides what actually works. Wiping up the ants you can see removes a tiny fraction of a colony that averages four to seven thousand workers, and it leaves both the queen and the scent trail intact, so a fresh column arrives within the hour. Three things end it. Cut off the food, destroy the trail, and get a treatment back into the nest itself. The rest of this article covers how to do each one, how to work out where the nest is, and how to tell a routine garden ant problem from one that needs a professional.
The ants you see are foragers, not residents
Nearly every ant call we take is the black garden ant, which is very dark brown rather than truly black. Workers run three to five millimetres. There are more than forty ant species in the UK, but only a handful ever bother a house, and this is the one that does it.
A colony has a single queen who can live well over a decade, and she never leaves the nest. The ants indoors are a small foraging party. Killing them changes nothing at all where it counts, which is why the problem appears to reset every morning.
The trail is the mechanism people miss. A worker that finds food walks back to the nest laying pheromone as it goes, and every ant that follows reinforces it. That is why you get one ant on Monday and a marching column on Tuesday.
What is actually drawing them in
Sugar, overwhelmingly. Jam, honey, fruit, fizzy drink residue in the recycling, dry pet food, and the sticky film around the base of a kitchen bin. In a dry spell they will also come in for water, which is why sinks and pet bowls pick up traffic in July even in a spotless kitchen.
We’ve found the bin is the most under-checked source in a Kent kitchen. People scrub the worktops and the floor and never lift the liner out to look at the plastic underneath it.
Getting in is easy for them. Gaps around pipework under the sink, cracks in mortar, the underside of a door threshold, the surround of an airbrick, or the line of the damp proof course. A three millimetre insect does not need a hole you can see. The season runs roughly April to October, because the nest is outdoors and activity tracks ground temperature.
Why some homes here get it worse than others
From working with clients across Romney Marsh and the coastal strip, the ground is a large part of the answer. Much of the Marsh is reclaimed land and shingle. It drains freely, it warms quickly, and it holds that heat. Black garden ants want precisely that, so a lot of properties around Dymchurch, Lydd and New Romney sit on close to perfect nesting ground.
Block paving is the other big one. It is laid on a sand bed with sand-filled joints, and ants will nest straight into it. The tell is small volcano-shaped piles of sand pushed up between the blocks, almost always on the sunniest side. Newer estates around Ashford and Hawkinge are full of it, and the nest is often within a metre of the back door.
Older terraces in Folkestone and Hythe give ants a different route. Suspended timber floors and airbricks mean they can work along under the floor and surface anywhere they find a gap in the skirting, which is why the trail sometimes seems to appear from nowhere in the middle of a room.
Why the spray under the sink does not end it
In our experience, a sugar-based gel bait works better than a contact spray because the workers carry it back into the nest and feed it to the queen and the brood, which kills the colony at source, whereas a spray only kills the ants it lands on and leaves the queen laying replacements at the same rate as before. That difference is the whole reason treating the nest and simply spraying the trail produce such different outcomes.
There is a second problem with sprays. Many household ones are repellent, so rather than destroying the trail they scatter it. The ants reroute, often into a wall cavity or under the floor where you cannot watch them, and the job becomes harder to solve than it was to begin with.
Gel goes into cracks, hinge gaps and the back of units rather than on open surfaces, which is also why it is a more sensible choice than an aerosol if you have pets or young children in the house.
What about flying ants
Flying ants usually arrive in July, on a warm, humid, still day, often a day or two after rain. This is the nuptial flight, when winged males and new queens leave the nest to mate. It is not one national flying ant day. It comes in waves across several weeks, and colonies in the same area tend to synchronise, which is why an entire street gets it at once.
They are harmless and gone within a couple of days. They are also genuinely useful. If they are pouring out of a doorstep, a patio joint or an airbrick, you have just found your nest without lifting a slab.
Not every ant is a garden ant
Red ants are smaller, reddish, and they sting. They are mostly a garden nuisance rather than an indoor one.
Pharaoh’s ants are the species to take seriously. They are tiny, pale yellow, tropical in origin, and they only survive in heated buildings, so flats, care homes and hospitals are where they surface. They have multiple queens, and spraying them makes the colony split and spread rather than die. Baiting is the only reliable route with them.
A rough field test is the calendar. Tiny pale ants crossing a kitchen in January are not garden ants, and reaching for an aerosol is the worst thing you can do.
What to try before calling anyone
Wipe the trail down with hot water and a detergent, which lifts the pheromone properly. Then store food airtight, clean the bin including the base and the lid seal, and lift pet bowls between meals.
If you use a bait, put it directly on the live trail and then leave it completely alone. The mistake we see most often is people throwing the bait out after two days because more ants have turned up. More ants is the bait working. They are recruiting to it and carrying it home to the queen. Clear the trail away at that point and you have cut your own delivery route.
When to get someone in
Call if the trail returns within days of baiting, if ants are appearing upstairs or emerging from inside a wall, if you have tiny pale ants year round in a heated building, or if it is a food business where you carry due diligence obligations.
We are a family run firm, BPCA members, and we have been dealing with ant problems across South East Kent since 2008, with more than twenty years in the trade behind the work. We operate out of Dymchurch and cover Ashford, Folkestone, Hythe, Dover, Canterbury and the Marsh, with same day response on urgent jobs.
If ants are coming into your house and you would rather not spend the rest of the summer chasing them across the worktop, get in touch and we will find the nest.
