How Do You Know If You Have an Ant Infestation in Cambridge?

Ants get into almost every Cambridge property at some point in the summer, and most of the time it means nothing at all. The useful question is not “are there ants” but “are they organised”.

The One Sign That Actually Matters

A trail. Not ants, but ants following each other along the same route, repeatedly, over days.

That is the difference between a wanderer and a colony. When a foraging ant finds something worth having, it lays a pheromone trail on the way home. Other workers follow it and reinforce it, and within hours you have a defined line running from a gap somewhere to whatever they have found.

A trail means a colony has committed resources to your property. That is what is worth treating.

The Other Signs, and What Each One Means

Ants at the same spot every day

Behind the kettle, under the toaster, at the pet bowl, around the bin. Repetition is the signal — it means there is a food source they have locked onto, and finding it is usually half the solution.

Ants emerging from a crack or a skirting

More significant than ants coming in under a door. If they are coming out of the fabric of the building — a floor joint, a skirting board, a gap around a pipe — the route is established and may lead to a nest in or under the structure.

Fine sand or soil appearing outside

Small heaps of excavated material between paving blocks, at slab joints, or along the base of a wall. That is spoil from a colony digging below, and if it is against the house it is the likely source of anything you are seeing indoors.

Activity returning within days of a spray

One of the clearest indicators there is. A supermarket spray kills the foragers it touches; if the colony is established, replacements are out within a few days. Ants back within a week of spraying means the nest is untouched and near.

Winged ants indoors

Winged ants outdoors in summer are the normal nuptial flight and need nothing. Winged ants emerging from inside the building are different — that means a mature colony in the structure, and a colony only produces winged forms once it is well established.

Activity in the middle of winter

What Is Not an Infestation

• A handful of ants after a door has been open on a warm day
• Ants in the garden, in the lawn, or under a stone — that is where they live and they are useful there
• A single ant on a worktop with no others behind it
• Winged ants outside on a warm humid afternoon in summer
• Ants on a fence or a shed away from the house

None of these needs treating, and anyone who tells you otherwise is selling you something you do not need.

A Five-Minute Check

1. Watch the line for sixty seconds. Which way is the traffic going? There will be two streams — one loaded, one empty.
2. Follow it away from the food. Along the worktop, down the unit, along the skirting. Where does it leave the room?
3. Note the exit point. A gap at floor level, an airbrick, a pipe entry, the threshold of an external door.
4. Go outside and look at that spot. Nine times out of ten the answer is there — soil against the wall, a patio joint, a path.
5. Check for sand. Fresh fine spoil between blocks or slabs is the colony telling you where it is.

That five minutes is genuinely useful information, and telling us what you found makes the visit faster.

What Happens Next

Our ant control service is £240 fixed price and guaranteed, with no call-out fee. The cost guide sets out what that covers, and the main Ant Control Cambridge page explains the service in full.

If you are not certain the problem is ants at all, a pest inspection and survey is £120 fixed cost and settles it.