To get rid of Pharaoh ants in the UK, you must use non-repellent, professional-grade baits placed strategically across all affected areas, supported by thorough surveys, removal of food sources, and follow-up visits to ensure satellite colonies are eliminated. Sprays should never be used — they trigger “budding”, causing the colony to split into multiple nests and making the infestation far worse.

Because Pharaoh ants are a tropical species that only thrive in heated buildings, effective control depends on understanding their biology, behaviour, and unique colony structure. This guide explains exactly how to identify them, where they nest, how modern baits work, and when professional BPCA-certified intervention is essential.

Identify Pharaoh Ants

Pharaoh ants (Monomorium pharaonis) are one of the smallest pest ant species found in UK buildings. Workers measure just 1.5–2 mm, are pale yellow to reddish, and have a darker abdomen with distinctive elbowed antennae.

Their biology makes them difficult to control:

• They are a tropical species, surviving only indoors in heated environments.
• They require 18°C+ to breed, with optimum development around 30°C — common around ovens, boilers, and warm pipe runs.
• They form multiple-queen colonies, which allows rapid expansion.
• They bud when threatened, producing satellite nests that spread through the structure.

You’ll typically find them foraging along edges, skirting boards, pipe runs, and electrical outlets, particularly in kitchens, bathrooms, bakeries, hospitals, and places with consistent heat and humidity.

Correct identification is essential because the wrong treatment — especially sprays — causes colony fragmentation and rapid spread.

Inspect for Infestations

Pharaoh ants rarely nest in obvious locations. Colonies are often hidden within:

• Wall voids
• Electrical sockets
• Pipe boxes and risers
• Under appliances
• Airing cupboards and boiler rooms
• Voids around ovens or commercial machinery

Because only 5–10% of workers forage, visible ant trails represent only a fraction of the total colony.

Effective inspection requires:

• Tracking foraging trails to warm areas
• Checking multiple floors (they spread vertically through buildings)
• Gathering information from occupants
• Using non-toxic bait placements to map activity where needed

If ants reappear in new areas or across several rooms, budding has likely occurred — a sign that inappropriate treatments were used previously.

A professional inspection from a BPCA-certified technician can help identify all active nests and entry points, providing a clear ant treatment plan to remove Pharaoh ants safely and completely.

Eliminate Food Sources

Before baiting, remove attractants that interfere with control:

• Deep-clean kitchens, especially behind cookers and under fridges
• Store food in airtight containers
• Rinse recycling and wipe surfaces daily
• Seal bins and empty them regularly
• Clean up sugary spills, grease, and residues immediately

This step supports bait uptake and prevents ants from choosing easier food sources instead.

Use Effective Insecticides

The key to controlling Pharaoh ants is non-repellent, slow-acting baits — never sprays.

Why Sprays Fail

Spraying Pharaoh ants:

• Causes budding, splitting colonies into multiple nests
• Drives ants deeper into the building
• Extends the infestation
• Makes professional treatment slower and more complex

How Modern Baits Work

Before 2010, technicians relied almost solely on s-methoprene IGR baits, which disrupt reproduction but take 4–6 months for full control.

Today, faster-acting gel baits containing compounds such as imidacloprid allow:

• Visible reduction within one week
• Full colony control typically in 2–3 weeks
• Excellent transfer through workers to queens and developing brood

These baits are placed:

• Along foraging routes
• Near heat sources
• Behind appliances
• Inside voids
• At entry points between rooms

Use IGRs When Required

IGRs still have value in:

• Organic-certified environments
• Sensitive sites where non-toxic formulations are preferred
• Situations where long-term colony sterilisation is desirable

A combined baiting strategy, tailored to the building, yields the best results.

Placement Matters

Controlling Pharaoh ants requires comprehensive coverage. Technicians work from the outside of the infestation inward, ensuring no colony pockets are missed.

Under-baiting guarantees treatment failure.

Seal Entry Points

After the colony has been controlled, preventing reinfestation is essential.

Seal:

• Gaps around pipework
• Cracks in walls and tiles
• Voids behind units
• Window and door frame gaps
• Damaged sealant around sinks or appliances

Outdoors:

• Trim vegetation touching the building
• Seal gaps around utility entry points
• Reduce moisture accumulation near walls

Proofing helps prevent both Pharaoh ants and other crawling insects from returning.

Monitor and Prevent Re-Entry

Even after successful extermination, Pharaoh ants can reappear if a hidden satellite colony survives.

Monitor:

• Warm pipe runs
• Kitchens and bathrooms
• Electrical outlets
• Skirting board edges

Maintain cleanliness and reduce moisture levels. Keep monitoring baits discreetly in key areas for a few weeks.

If activity re-emerges, a secondary nest may have gone unnoticed — requiring another round of targeted pharaoh ant treatment.

Natural Methods to Eliminate Pharaoh Ants

Natural Methods (Helpful for Minor Activity Only)

Natural remedies can reduce trails but do not eradicate colonies because they do not reach queens or brood.

You may use:

• Vinegar and water spray – disrupts pheromone trails
• Baking soda + sugar bait – limited effectiveness
• Diatomaceous earth – dehydrates ants on contact

These methods are suitable for mild nuisance activity but not established infestations. For multi-queen colonies, professional treatment is the only reliable solution.

When to Call a Professional

Call a pest control professional if:

• Ants reappear after DIY attempts
• You see activity in multiple rooms
• Ants appear near warm machinery or pipe runs
• You suspect satellite colonies
• You manage a commercial setting (bakeries, care homes, hospitals, restaurants)

Because Pharaoh ants can nest deep within structures and bud rapidly, BPCA-certified intervention is often required for complete eradication.

Bugwise Pest Control uses:

• Advanced non-repellent gel baits
• Integrated insect growth regulators
• Professional surveying techniques
• Follow-up programmes to ensure eradication
• Long-term proofing and prevention advice

We provide discreet, guaranteed Pharaoh ant treatments across London, Essex, Romford, Ilford, Barking, Dagenham, and surrounding areas.

For clearer images and a full breakdown of their appearance and behaviour, see our complete Pharaoh Ant Identification Guide.