Preventing ants is far easier and cheaper than treating an established colony. Ants enter homes for two reasons — food and water. Remove these attractants and seal the entry points, and most ant problems can be avoided entirely.
This guide covers practical, proven prevention measures for both inside your home and in your garden.
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Inside Your Home — Food and Hygiene
Ants are attracted by even tiny amounts of food residue. These measures remove the incentive for scouts to recruit workers into your home:
Wipe surfaces immediately — clean up spills, crumbs, and sticky residue on worktops, hobs, and tables as soon as they occur.
Store food in airtight containers — transfer sugar, cereals, biscuits, and pet food from packets into glass or plastic containers with sealed lids.
Keep bins clean and sealed — use bins with tight-fitting lids indoors and out. Clean the bin and surrounding floor regularly to remove sticky residue.
Remove pet food between meals — pick up bowls after feeding and wipe the floor underneath. Pet food is one of the top attractants.
Do not leave dirty dishes overnight — wash up or load the dishwasher before bed. Ants are most active at night during warm months.
Clean under appliances — food debris under the fridge, oven, and toaster builds up quickly and draws ants in.
Seal Entry Points
Ants exploit gaps as small as 1mm. Sealing entry points is the most effective physical prevention measure:
Skirting board gaps — caulk or fill any gaps between skirting boards and the floor or wall, especially in the kitchen and bathroom.
Door and window frames — check seals around door frames, window frames, and thresholds. Replace cracked or shrinking sealant.
Pipe entry points — seal gaps around pipes, cables, and conduits where they pass through external walls using silicone or expanding foam.
Air bricks and vents — ensure mesh covers are intact and not cracked or missing.
Cracks in brickwork and render — fill any external cracks, particularly at ground level and around the foundation.
Garden and Outdoor Prevention
Most ant colonies nest outdoors and forage inside. Reducing nest sites near your home cuts the risk significantly:
Move nest sites away from the house — ant nests under paving slabs, in cracks beside walls, and in borders against the house are more likely to forage indoors. Treat or disturb nests within 1–2 metres of external walls.
Trim vegetation — cut back plants, shrubs, and overhanging branches that touch external walls. Ants use vegetation as bridges to reach windows and upper floors.
Clear debris — remove leaf litter, rotting wood, and garden waste piled against the house. These provide ideal nesting cover.
Manage compost bins — keep compost bins away from the house and ensure they have sealed bases to reduce ant nesting underneath.
Clean patios and decking — sweep up food debris from barbecues and outdoor eating areas promptly.
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Seasonal Prevention Tips
Ant behaviour changes through the year. Adjust your prevention efforts accordingly:
Spring (March–May) — colonies become active as temperatures rise. Seal entry points and clean thoroughly before the season starts. This is when scouts begin searching for food sources.
Summer (June–August) — peak activity. Maintain strict food hygiene, keep windows and doors closed or fitted with screens, and deal with spills immediately. Flying ant swarms occur during this period.
Autumn (September–October) — activity decreases but colonies are stocking up for winter. Maintain hygiene standards and seal any new gaps that have appeared over summer.
Winter (November–February) — garden ants are dormant. However, Pharaoh ants and ghost ants remain active year-round in heated buildings. If you see ants in winter, you likely have an indoor-nesting species that needs professional treatment.
When Prevention Is Not Enough
If you have sealed entry points, removed food sources, and still see regular ant trails, the nest is likely very close to or inside your property. At this point, professional treatment is the most effective option.
Pharaoh ants and ghost ants nest inside heated buildings year-round and cannot be prevented by outdoor measures alone. If you suspect either species, professional identification and treatment is essential — DIY sprays will make the problem worse. Visit our Ant Control page for professional help.
Frequently Asked Questions
Does white vinegar prevent ants?
Vinegar disrupts pheromone trails temporarily, which can deter ants from a specific route. However, it does not kill ants, repel them long-term, or affect the nest. It is a short-term measure, not a prevention strategy.
Do cinnamon or peppermint repel ants?
Some strong-smelling substances may briefly deter ants from a specific area, but ants simply find alternative routes. There is no scientific evidence that household spices or essential oils provide effective long-term ant prevention.
Can ants get through sealed windows?
Yes — if the sealant has cracked, shrunk, or degraded. Check window and door seals annually and replace any that have gaps. Ants can enter through gaps as small as 1mm.
Should I kill ants I see in my house?
Killing individual ants does not solve the problem — the colony replaces them within hours. Instead, follow the trail to identify the entry point, clean the area with soapy water to remove the pheromone trail, and seal the gap. If trails persist, professional treatment is needed.
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