Under the Units and Along the Skirtings
Behind the plinth of a fitted kitchen there is a shallow gap running the length of the units, and very little ever comes out of it. Crumbs, hair, fibres from a doormat and a season's worth of dead insects collect there in the dark, which is a working larder for something a few millimetres long. The same is true of the run where a carpet is gripped against a deep skirting, and of the space under a divan bed with drawers that are never fully pulled out.
Because that material is the food, a house with hardly any carpet can still hold plenty of larvae. Look where fluff gathers rather than where the wool is. Where carpet beetles hide lists the spots worth a torch, and how to know whether you have them helps if you have only found a couple of beetles so far.
Old Nests and Dead Flies in an Interwar Roof
The roofs here have timber eaves, a gap at the verge and a lower roof at the rear, and sparrows and starlings get into all of it. Once the birds have finished with a nest it stays behind as a heap of feathers, droppings and dead insects, which is about the richest food a carpet beetle larva will ever find. A loft adds to it in its own right: flies and other insects that get in through a gap die against the joists and in the insulation and are never cleared out.
It is an offence to damage or destroy the nest of a wild bird while it is in use, so an active nest is left alone until the birds have gone. After that the debris wants clearing and the gap closing, which on a roof means a roofer with proper access rather than anyone on a ladder leaning sideways. Do not try to hook a nest out of the eaves from an upstairs window.
The Way Down Into the House
From the loft, the route indoors is short: the hatch on the landing, the gaps where pipes and cables drop through the ceiling, and the airing cupboard where towels, spare bedding and wool blankets are stacked warm. That is why the rooms just under the roof produce beetles first, and why the cupboard is worth emptying and vacuuming out early on.
What You Actually See, and When
- Rounded beetles two or three millimetres long, mottled brown, cream and yellow, indoors and on glass in spring and early summer
- Short brown larvae covered in bristles, curled along a carpet edge, under a bed or in a wardrobe base
- Pale hollow skins the larvae have shed, in drawers, under units and against the skirting
- Small ragged holes in jumpers, blankets, a wool rug or a felt-backed mat
Why the adults head for the windows explains the spring rush, and the larvae guide confirms what you have found. Smooth pale grubs with silky webbing point to carpet moths in Neasden instead, and the comparison guide settles it in a minute.
Itchy Skin and the Larvae
The bristles irritate some people's skin on contact, which can leave a rash that gets mistaken for bites. A pharmacist or GP is the person to ask about a rash or any other symptom, and anything that looks like a severe allergic reaction is a 999 call. Since the two get confused, going over the mattress seams for bed bugs is a sensible way of ruling the other possibility out.
Booking and Preparing the Rooms
Tell us which rooms have larvae, beetles or damage, whether birds go in and out of the eaves, and whether anything is stored in the loft, because the loft is treated as one of the rooms if the larvae are up there. Beforehand, vacuum the carpet edges, under the beds, inside wardrobe bases and along the kitchen plinth, and empty the cleaner outside. Adults can still appear for a while, particularly through the spring; how long it takes to settle depends on the rooms involved and on whether the source in the roof has been dealt with, and new larvae after the period we give you is a reason to ring.
Keeping the Numbers Down
- Pull the plinth off a kitchen run once in a while and vacuum the gap behind it
- Take divan drawers right out and vacuum the floor they sit on, not just the visible carpet
- Empty the airing cupboard and vacuum the slats and the floor when the bedding is changed over
- Have an empty nest cleared and the eaves gap closed by a roofer once the birds have finished with it
- Keep wool and feather items clean and bagged instead of loose in a loft or a case
- Vacuum up beetles found at a window rather than letting them wander back into a wardrobe
Preventing carpet beetles returning and the Brent carpet beetle advice cover the longer view; the borough page is Carpet Beetle Control Brent, and Pest Control Neasden takes in the area as a whole.
