How to Repel Ants in the Kitchen

The instinct when you see ants on a worktop is to squash them, and it's genuinely one of the worst things you can do. Some UK ant species release alarm pheromones when crushed, which attracts more ants to that exact spot rather than deterring them. More fundamentally, the ants you can see are a tiny fraction of the colony, and killing foragers does nothing to the nest producing them. Effective ant control in a kitchen works on two fronts: breaking the invisible chemical trails guiding them to your food, and using bait that workers carry back to the queen.

What's Actually Happening

The black garden ant, Lasius niger, is by far the most common species entering UK homes, with colonies typically containing 4,000 to 15,000 workers. When a single scout ant finds food, it returns to the nest laying a pheromone trail, a chemical scent path that other workers then follow directly to the source. This is why a couple of ants on Monday becomes a steady procession by Wednesday, the trail is being reinforced with every trip.

Understanding this changes the whole approach. If you clean up the food but leave the trail intact, ants keep arriving to check. If you break the trail but leave a food source, they simply re-establish it. You need both.

Step 1: Break the Pheromone Trails

Wipe down every surface ants have been walking on with a solution of white vinegar and water, roughly equal parts, or a strong soapy water mix. This dissolves the scent trail rather than just cleaning the surface visually. Pay attention to the routes rather than just the destination, follow the line of ants back to where they enter and treat the full path along skirting, worktop edges, and around window frames.

Step 2: Remove Every Food and Water Source

Ants are foraging for exactly three things: food, moisture, and warmth. Store dry goods in airtight containers rather than opened packets. Wipe up crumbs and spills immediately, including sticky residue on the outside of jars and bottles, which is a genuinely common overlooked source. Don't leave pet food bowls down between feeding times. Empty and clean the bin regularly, and check under it, since spills underneath a bin are a classic hidden attractant. Fix any dripping taps, since standing water matters as much as food.

Ants are largely nocturnal foragers, so leaving anything uncovered overnight is particularly worth avoiding.

Step 3: Use Bait, Not Spray

This is the step that actually resolves an infestation rather than reducing its visible symptoms. Surface sprays kill the ants you can see and leave the colony entirely untouched. Bait works the opposite way, workers carry it back to the nest and feed it to the queen and brood, collapsing the colony from within.

A homemade borax and sugar paste, mixed at roughly one part borax to three parts sugar, is the classic approach and typically eliminates a colony within about seven days. Commercial gel baits and enclosed bait stations work on the same principle and are the standard professional method.

The counterintuitive part is that you should let ants take the bait rather than clearing them away. Seeing more ants around a bait station in the first day or two is the treatment working, not failing.

Step 4: Seal the Entry Points

Follow the trail to find where they're coming in, typically tiny gaps around pipework, under door thresholds, at skirting board junctions, or around window frames. Seal these with sealant or filler once the colony has been dealt with. Doing this before baiting can simply redirect them to another entry point rather than resolving the problem, so it's worth doing in this order.

Natural Deterrents That Genuinely Help

Once trails are broken and bait is working, deterrents at entry points reduce the chance of re-establishment. Cinnamon, coffee grounds, and vinegar sprays all disrupt or mask pheromone trails, and cost under £5. They're supplementary rather than a solution on their own, since none of them affect the colony, but they're genuinely useful at doorways and known entry points.

Why a Deep Clean Matters More Than Usual Here

Ant control in a kitchen is unusually dependent on eliminating food sources that a normal wipe-down misses, grease films behind the hob, crumbs under the toe-kick beneath units, residue in the tracks of drawers, and spills underneath appliances. These are exactly the areas that routine cleaning skips and that a proper deep clean covers. Our related guide covers how to deep clean a kitchen properly, including the behind-appliance and under-unit areas that most commonly harbour the food sources keeping an ant trail alive after everything visible has been cleared.

When You Need a Professional

Most black garden ant problems resolve with the approach above. There are genuine exceptions worth knowing about.

Pharaoh ants specifically should never be treated DIY. These are small yellow-brown ants roughly 1.5 to 2mm long, found in heated buildings, and they respond to over-the-counter insecticides by budding, splitting into multiple new colonies and making the problem substantially worse. They need a specialist bait protocol carried out by a qualified pest controller, and treatment can run several weeks to months.

Also worth calling a professional if the colony appears to be nesting inside a wall or kitchen cavity rather than outdoors, if you've baited properly and activity continues after two to three weeks, or if the infestation spans multiple rooms rather than following a single kitchen trail.

Common Mistakes and What to Do Instead

Mistake: squashing ants on sight. Some species release alarm pheromones when crushed, drawing more ants to that spot. Wipe them up with vinegar solution instead, which removes them and breaks the trail simultaneously.

Mistake: using surface spray as the main treatment. It kills visible foragers while the colony continues producing thousands more. Bait that gets carried back to the nest is what actually resolves an infestation.

Mistake: clearing ants away from bait stations. More ants around bait in the first days means it's being carried back to the colony. Leave them to it.

Mistake: sealing entry points before treating the colony. This often just redirects them to a different gap. Deal with the nest first, then seal.

Mistake: cleaning the destination but not the trail. Removing food without dissolving the pheromone path means ants keep arriving to check. Treat the full route they've been walking.

Mistake: attempting DIY treatment on Pharaoh ants. Over-the-counter products cause this species to bud into multiple colonies. Correct identification matters before choosing any method.

What It Costs in the UK

DIY treatment is genuinely inexpensive. Borax typically costs a few pounds, natural deterrents like cinnamon, coffee grounds, and vinegar come to under £5 in total, and commercial ant bait stations typically cost £5 to £15 for a pack.

Professional treatment for black garden ants in a residential property typically costs £150 to £180 for a standard treatment involving targeted insecticide gel or spray, with the wider UK range running roughly £120 to £300 depending on infestation severity, property size, and the number of treatments needed. BPCA-certified technicians sit at the upper end of that range and are worth it for species identification alone if you're unsure what you're dealing with.

If ants have nested inside kitchen units or wall cavities, treatment sometimes requires units to be cleared or partially removed for access, which is worth understanding as a possibility before it arises. For context on the scale of that, according to InstantCost.co.uk's 2026 UK kitchen renovation pricing data, a fully fitted kitchen costs £8,000 to £15,000 for a standard 8 to 12 unit kitchen, which is a useful reminder that treating an infestation properly at £150 to £300 is considerably cheaper than the disruption of dealing with damage or contamination in fitted units later.

Pest control figures are based on current UK provider data including Checkatrade. Kitchen renovation figures are from InstantCost.co.uk's 2026 UK pricing data.

Staying Safe

Borax is toxic if ingested, so keep any homemade bait well out of reach of children and pets, and use enclosed bait stations rather than open dishes in any household with either. If you have young children or pets and are uncertain about placing bait safely, professional treatment using enclosed stations is the more sensible route.

Never mix insecticide products, and ventilate the kitchen during and after any treatment. Store all products in original labelled containers.

Product guidance varies by manufacturer, so check labels for placement and safety instructions, particularly regarding children and pets.

FAQ

Why do more ants appear after I kill the ones I see? Some species release alarm pheromones when crushed, attracting others to that location. Beyond that, visible foragers are a small fraction of a colony that may contain 4,000 to 15,000 workers, so killing them doesn't reduce the source.

Does vinegar actually get rid of ants? It breaks the pheromone trails guiding ants to food, which is genuinely useful, but it doesn't affect the colony. Use it alongside bait rather than as a standalone treatment.

How long does ant bait take to work? A borax and sugar bait typically eliminates a colony within about seven days, as workers carry it back to the queen and brood. Expect increased ant activity around the bait initially, which indicates it's working.

Should I seal up entry points straight away? Treat the colony first. Sealing before baiting often just redirects ants to a different gap rather than resolving the underlying nest.

How much does professional ant control cost in the UK? Typically £150 to £180 for standard black garden ant treatment, with the wider range running £120 to £300 depending on severity, property size, and number of visits required.

Which ants should I never treat myself? Pharaoh ants, small yellow-brown ants around 1.5 to 2mm found in heated buildings. Over-the-counter products cause them to bud into multiple colonies, making the problem worse. These need specialist professional treatment.