Small, brown, and covered in bristles. Finding one tells you three things — what it is, that something is being eaten, and roughly where to look for the rest.
The damaging stage of the carpet beetle — elongated, brown, densely bristly, up to about 5mm, often called woolly bears. They feed on keratin: wool, silk, fur and feather.
The adult beetle you may also have seen does not damage fabric. Finding larvae means active feeding is happening now.
If what you have found is smooth and cream rather than brown and bristly, that is a carpet moth larva. Similar damage, comparable treatment, different search.
Read nextCarpet Beetles or Carpet Moths in Harrow – How Do You Tell? →Carpet beetle larvae moult repeatedly as they grow and leave the empty bristly skin behind. Those skins look almost identical to the larvae, which causes two problems:
A live larva moves when disturbed. A shed skin is papery and hollow. Worth checking before drawing conclusions either way.
See our complete service, published room prices and treatment information.
View Carpet Beetle Control Harrow →Two routes, and the second is the one people miss.
Adult carpet beetles feed on pollen and are drawn to flowering plants. They come in through open windows in spring and early summer and lay eggs on suitable material indoors.
This is the important one. Old birds' nests in eaves and roof voids, nests in disused chimneys, dead birds or rodents, and old wasp nests all contain exactly what carpet beetle larvae feed on. Such a source produces adults continuously, which then fly down into the rooms below.
If you are finding larvae in several upstairs rooms, check the loft. It is twenty minutes and it can be the difference between one treatment and two.
Away from light, in natural fibres:
| Material | At risk? |
|---|---|
| Wool carpet and rugs | Yes |
| Wool clothing, especially stored | Yes |
| Silk, cashmere, sheepskin, fur, feather | Yes |
| Upholstery with natural-fibre content | Yes |
| Taxidermy and natural-history items | Yes — a known museum pest |
| Polypropylene and nylon carpet | No |
| Cotton and linen | Not usually, unless soiled |
Carpet beetle larvae do not bite. Some people react to the bristly hairs with an itchy rash, which gets mistaken for bites and occasionally for bed bugs.
If someone in the household has an unexplained itchy rash and you have found bristly larvae, the two may be connected. A doctor can advise on the rash; we can deal with the source.
Any live larvae mean active feeding. The number matters less than the extent — how many rooms they are in.
Not on the fibre itself, but they can live in the debris that accumulates in it — pet hair and human hair are keratin too.
If the source is still there, yes. Which is the argument for finding it rather than only treating the rooms.
An old wasp nest is a carpet beetle food source — and a live one is £90 fixed cost across Harrow, guaranteed.
Elongated, brown and densely bristly, up to about 5mm, often with a tuft of longer hairs at the tail.
Larvae moult repeatedly and leave empty bristly skins behind, which look almost identical to the larvae.
Adults flying in from outside, or a source inside the building — most often an old bird's nest in a roof space.
Under furniture that never moves, along carpet edges, under rugs, in wardrobes and airing cupboards.
Keratin — wool, silk, cashmere, sheepskin, fur and feather. Synthetics are generally not at risk.
No. Some people react to the bristly hairs with an itchy rash mistaken for bites.
Not on the fibre, but they can live on the pet and human hair that accumulates in it.
Any live larvae mean active feeding. The extent — how many rooms — matters more than the number.
Photograph one and tell us where you found it. And check the loft — it is often where these start.
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