Ants are among the most common household pests in the UK, with black garden ants and pharaoh ants frequently invading kitchens and food storage areas in large numbers.
Typical Cost
£60–£120
DIY Possible?
For mild cases
Season
Ant activity in the UK is strongly seasonal
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The black garden ant (Lasius niger) is by far the most common ant pest in UK homes, entering buildings in search of sweet foods during spring and summer. Pharaoh ants (Monomorium pharaonis) are a more serious indoor pest, particularly in heated buildings such as hospitals and blocks of flats, and require specialist treatment. While ants are not typically a health hazard, large infestations can contaminate food, undermine paving, and cause considerable nuisance.
Ready-to-use bait stations containing a sweet liquid insecticide that worker ants carry back to the nest, poisoning the queen and the entire colony. Place stations along ant trails and near entry points. Allow up to two weeks for the bait to be distributed throughout the colony.
Pouring several kettles of boiling water directly into an outdoor ant nest entrance. This can kill a significant number of ants and may destroy a small nest, but larger colonies often extend too deep for the water to reach the queen and brood chambers.
Applying permethrin-based ant killer powder along ant trails, around entry points, and directly onto visible nests. Worker ants walk through the powder and transfer it to the nest. Effective for garden ants but must be kept dry to remain active.
Using silicone sealant or caulk to block gaps around doors, windows, pipes, and cracks in walls where ants are entering the property. This does not address the nest itself but prevents ants from gaining access to your kitchen and food areas.
Thoroughly cleaning kitchen surfaces, storing food in sealed containers, wiping up spills immediately, and keeping bins clean and closed. Removing the food source that is attracting ants into the property can encourage them to forage elsewhere.
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Professional ant treatment costs depend on the species involved and the extent of the infestation. Garden ant treatments are usually straightforward and may require just one or two visits. Pharaoh ant infestations in large or multi-occupancy buildings can be significantly more expensive and time-consuming, potentially requiring a coordinated treatment programme across multiple units.
Ant activity in the UK is strongly seasonal. Colonies become active in spring (March–April) as temperatures rise, and foraging workers increasingly enter buildings from May through September. The famous "flying ant day" events typically occur in July or August, when winged males and queens swarm to mate — though swarming may happen over several days or weeks depending on weather conditions. Ant activity drops significantly from October onward, and colonies become dormant through winter.
Flying ant day refers to the period, usually in July or August, when virgin queen ants and males take flight to mate. It is not a single nationwide event — swarming is triggered by warm, humid conditions following rain and can occur on different days in different areas. The swarms are harmless and typically last only a day or two.
Ants send out scout workers to search for food, and when a scout finds a reliable source, it lays a chemical (pheromone) trail back to the nest for other workers to follow. Sweet and sugary foods are particularly attractive to the common black garden ant. Cleaning the trail with soapy water and removing the food source will discourage further visits.
The common black garden ant does not sting and its bite is too weak to pierce human skin, so it poses no direct health risk. However, pharaoh ants (found mainly in heated buildings) can carry harmful bacteria. The main concern with garden ants is food contamination and the nuisance of large numbers in the home.
The only way to permanently resolve an ant problem is to destroy the queen in the nest. Bait-based treatments are the most effective approach because workers carry the bait back to the colony. Killing surface ants with spray only removes a fraction of the colony and the queen will quickly replenish worker numbers.
Garden ants do not cause structural damage to buildings in the UK, unlike carpenter ants found in other countries. However, nesting activity can undermine paving slabs, damage lawns, and push fine soil into properties through small gaps. In rare cases, ants nesting near electrical connections can cause short circuits.
Wasps become a significant nuisance across the UK each summer, and their nests — which can house thousands of aggressive insects — often require professional removal.
Cockroaches are one of the most reviled pests in the UK, carrying serious disease risks and thriving in warm, humid environments such as kitchens, bathrooms, and commercial food premises.
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