Varied carpet beetleAnthrenus verbasci — identification, signs & control

• Adults 1.5–3.5 mm, almost round, covered in a patchwork of white, brown and golden-yellow scales
• Short clubbed antennae; adults often play dead when touched and fly well in warm weather
• Larvae ('woolly bears') about 4–5 mm, carrot-shaped and banded brown, with dense hairs and backward-pointing tufts at the tail end
• Empty larval skins, like small hairy brown husks, collect where larvae have been feeding
• Damage shows as small scattered holes and thinning carpet along skirting boards, under furniture and in stored wool

Beetles on windowsills

Adults gather at windows from spring into early summer, trying to get outside to flowers.

Woolly bears

Small hairy larvae crawling on carpets, in drawers or on stored clothing, often near skirting boards.

Cast skins

Empty, bristly husks left each time a larva moults, often the first thing people find.

Scattered holes

Holes and grazing in wool carpets, rugs, felt, feather pillows and stored knitwear, with no silk webbing.

Itchy rash with no visible bites

Larval hairs can cause an itchy, bite-like rash in some people, which is easily mistaken for bed bugs.

Adult carpet beetles spend the warmer months on garden flowers, feeding on pollen and nectar, then fly in through open windows to lay eggs. Birds' nests are a favourite nursery: an old sparrow or starling nest in the eaves or loft can feed several generations, and larvae spread from there into the rooms below. Indoors they head for undisturbed natural fibres and debris, such as carpet edges, the floor under heavy furniture, airing cupboards, drawers, and fluff along skirting boards and in floor voids. Outdoors, development usually takes two summers; in a warm home the whole cycle can finish in a year. Adults live for two to six weeks.

Carpet beetles don't bite and don't spread disease. They cause slow, cumulative damage to wool carpets, rugs, upholstery, stored clothing, feather duvets and anything made of fur, and they are a serious pest in museum and natural-history collections. The larval hairs are the one health issue: in some people they cause itchy skin or a rash that looks very like insect bites, which leads to a lot of wrongly suspected bed bug infestations.

Carpet beetles are not covered by any specific pest law and don't need to be reported. Any insecticide used indoors must be an approved biocidal product used as the label directs. If the source is a bird's nest in the loft or eaves, remember that wild birds' nests are protected while in use or being built under the Wildlife and Countryside Act 1981, so clear old nests only once they are no longer active.

Many carpet beetle problems can be sorted at home. Vacuum thoroughly along skirting boards, under furniture and inside drawers and wardrobes, then empty the vacuum into an outside bin. Wash affected textiles hot, or freeze small items for about a week. Check the loft for old bird nests and dead insects, and clear them once nests are no longer in use. If you are still finding woolly bears or fresh damage a month after a thorough clean, or larvae are turning up in fitted carpets across several rooms, a residual treatment is worth having.

A free inspection comes first. We confirm carpet beetle rather than bed bugs or clothes moths, then trace the source, checking lofts, eaves, airing cupboards, floor edges and stored textiles. We ask you to vacuum and launder affected items beforehand. The technician treats carpet edges, the floor under furniture, the inside of emptied wardrobes and gaps between floorboards with a residual insecticide, and advises on removing old nests where that can be done lawfully. You get a written record of what was used and where, and we come back if larvae are still turning up. Treatments start from £90.

1. 1Vacuum under heavy furniture and along skirting boards regularly, including under rugs that rarely move
2. 2Store wool, feathers and furs clean and sealed; larvae favour stained fabric
3. 3Clear old bird nests from lofts and eaves once they are no longer in use, and stop birds getting back in
4. 4Fit fly screens to windows you open often in spring and early summer
5. 5Shake out cut flowers from the garden before bringing them indoors
6. 6Remove dead insects and fluff from loft insulation, window frames and light fittings

Carpet beetle hairs can cause an itchy rash that looks like bed bug bites, so on Hertfordshire call-outs for suspected bed bugs we look for woolly bears and cast skins before recommending any bed bug treatment. In the county's older houses, old sparrow and starling nests under roof tiles and in the eaves are a typical starting point, with larvae working down through the loft into the bedrooms below.

Areas we cover: St Albans · Harpenden · Hatfield · Welwyn Garden City · Watford · all areas