Ant Treatment London
Indoor & Outdoor Ant Control — Fast & Effective
While ants may seem like a minor nuisance, a mature black garden ant colony contains up to 15,000 workers and multiple queens. Pharaoh ants — increasingly common in London's heated buildings — carry Salmonella and Streptococcus, making them a genuine health risk in kitchens and food businesses. Without professional treatment that targets the queen and the entire colony, ant infestations will return season after season regardless of how many workers are killed on the surface.
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What's Included
Every treatment is carried out by a certified technician and includes:
How We Treat It
Our step-by-step treatment process, used by every Zeus technician on every visit.
Species Identification
Correct species identification is critical — Pharaoh ants require gel bait treatment exclusively, as insecticide sprays cause the colony to split and the infestation to spread. We identify the species before any treatment begins.
Gel Bait Application
For indoor species, professional-grade gel bait is placed directly along active ant trails. Worker ants carry the slow-acting bait back to the nest and feed it to the queen, eliminating the entire colony within 3–14 days.
Residual Spray & Perimeter
For garden ants and external infestations, a residual insecticide is applied to all trails, entry points, nesting areas and the full external perimeter of the property, creating a barrier against re-entry.
Follow-Up & Prevention
We advise on exclusion measures — sealing gaps, removing food sources and managing moisture — to prevent future infestations. A follow-up is available if activity persists after the initial treatment programme.
Frequently Asked Questions
Why do ants keep coming back every summer?
Garden ant colonies are perennial — the same colony returns to activity each spring. Without treating and eliminating the queen, worker ants will continue to emerge year after year. Professional gel bait treatment targets the queen directly rather than just surface workers.
Are Pharaoh ants dangerous?
Yes. Pharaoh ants are a serious health risk, particularly in hospitals, care homes and food businesses. They carry Salmonella, Streptococcus and Clostridium. They must be treated with gel bait only — insecticide sprays cause the colony to split and spread the infestation further.
Do I need to leave the property during treatment?
For gel bait treatment, no vacating is required. For residual spray treatment, we recommend leaving for 1–2 hours while surfaces dry. We will advise you on specific precautions tailored to your property before we begin.
Can you treat flying ants?
Flying ants are reproductive males and queens on their nuptial flight — typically a single warm day in July. If flying ants are emerging from inside your property, the indoor nest should be treated. External flying ant days do not require treatment.
How long does ant treatment take to work?
Gel bait takes 3–14 days to fully eliminate a colony as it must be distributed throughout the nest to reach the queen. Residual spray kills ants on contact and provides ongoing protection for several weeks from a single application.
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