How to identify it
Work down these in order — the first one is usually enough on its own.
- A single node in the waist and an evenly rounded thorax in profile
- Much larger than other common household ants
- Winged reproductives appear in spring and are frequently mistaken for termite swarmers
What it gets mistaken for
Most people arrive at a pest name by ruling things out. These are the ones that genuinely look similar, and the detail that separates them.
Where you will find it
- Damp or previously water-damaged wood — around leaks, window frames, door frames
- Beneath dishwashers and around bathroom plumbing
- Hollow doors, wall voids and the space beneath insulation
- Tree stumps, firewood and landscape timbers outdoors
Signs it is already there
You will nearly always see the evidence before you see the pest itself.
- Small piles of what looks like sawdust (frass), often with insect fragments in it
- A faint rustling in wall voids on a quiet night
- Large ants indoors persistently, especially after dark
Moderate. Worth dealing with, but not an emergency.
Why it is harder to deal with than it looks
The ants you see are foragers, often a long way from the nest, and the nest is usually inside wood you cannot open up. Surface spraying does nothing to it. Satellite nests are common, so finding one does not mean you have found them all.
What actually works
Find and fix the moisture, since carpenter ants overwhelmingly target wood that is already damp. Replace damaged timber. Treatment needs to reach the nest, which usually means baiting or a targeted void application rather than perimeter spray.
Common questions
How do I tell a carpenter ant from a eastern subterranean termite?
This is the important one. Ants have a pinched waist, elbowed antennae and front wings longer than the hind wings. Termites have no waist, straight antennae and four wings of equal length.
How do I tell a carpenter ant from a odorous house ant?
Odorous house ants are a fraction of the size and smell musty when crushed.
Where are carpenter ant usually found in a home?s
Damp or previously water-damaged wood — around leaks, window frames, door frames Beneath dishwashers and around bathroom plumbing Hollow doors, wall voids and the space beneath insulation.
Is a carpenter ant dangerous?
They do not eat wood, but they hollow it out to nest in it. Damage accumulates slowly and almost always indicates a moisture problem that needs fixing anyway.
Identification guidance only. Under Texas law, applying pest control treatments for hire requires a licence from the Texas Department of Agriculture. This page describes what a pest looks like — it is not a diagnosis of your property or a treatment recommendation for it.