Why Are Ladybirds Coming Into Your House? What to Do

Why are ladybirds coming into your house? When autumn turns colder, they look for a sheltered place to spend the winter. They are not breeding in the house, eating the building or infesting stored food.

The biggest gatherings are often harlequin ladybirds, but native species can also overwinter indoors. The sensible response is usually simple: leave them alone, or gently collect and move them without spraying or crushing them.

Why are ladybirds coming into your house?

Most adult ladybirds survive winter in a dormant state called diapause. As temperatures fall and food becomes scarcer, they seek dry, stable shelter. Natural hiding places include bark, rock crevices, hollow trees and leaf litter. Gaps around windows, roof spaces and sheds can offer a similar refuge.

Some species spend winter alone, while others form conspicuous clusters. Harlequin ladybirds are especially likely to gather in large numbers. According to the Royal Horticultural Society, autumn groups can be particularly noticeable on the warmer south-facing sides of buildings before the insects find a way inside.

This is seasonal behaviour rather than a sign that a home is dirty. A warm, bright spell may wake dormant beetles, which is why they sometimes begin crawling around a window in the middle of winter.

Are all indoor ladybirds harlequins?

No. Britain has more than 40 resident ladybird species, and several can use buildings for shelter. The familiar native two-spot ladybird is one example. The non-native harlequin, Harmonia axyridis, is simply the species most associated with very large indoor groups.

Harlequins vary enormously. They can be orange or red with black spots, or black with red spots, so spot-counting alone is unreliable. They are generally about 8 to 10 millimetres long and often have orange-brown legs and undersides. Native two-spot and ten-spot ladybirds are usually smaller, at about 4 to 5 millimetres.

If identification matters, photograph the insect from above and submit the sighting to the UK Ladybird Survey rather than guessing. The survey accepts records of harlequins and native species.

Can ladybirds damage a house or hurt people?

They do not eat timber, clothes, carpets or food, and they do not reproduce indoors during winter. The Natural History Museum describes harlequins in homes as harmless. Very occasionally a ladybird may nip if handled, but this is not a serious danger.

The practical nuisance is their defensive fluid. When frightened or crushed, a ladybird can release a yellow liquid that smells and may stain pale walls, curtains or furniture. This is why vacuuming, squashing and handling a whole cluster roughly are poor choices.

The harlequin does affect wildlife differently from native species. It eats aphids, but can also consume the eggs and larvae of other insects, including ladybirds. Evidence about its long-term effect on British native ladybirds is mixed, and destroying a few adults inside one home will not control its established population.

What should you do with ladybirds indoors?

1. Leave a settled cluster alone if it is not causing a problem. Dormant ladybirds use little energy and may remain quiet until spring.
2. For active beetles, use a soft brush and a container. Avoid pressing or shaking them, which can trigger the staining fluid.
3. Move them to a sheltered place. An unheated shed, a dry log pile or a purpose-made ladybird lodge offers protection without keeping them in a heated room.
4. Do not use insecticide. Sprays can harm native ladybirds and other beneficial insects as well as harlequins.

If you release active ladybirds outdoors, choose a sheltered dry spot rather than an exposed surface in severe weather. They need protection from repeated freezing and thawing, not a warm living room.

How can you stop ladybirds coming back?

Check window frames, vents and doors for small gaps, especially on sunny sides of the building. Repair loose seals and obvious cracks while preserving any ventilation the property needs. Fine insect mesh can help at suitable openings, but it must not block an air vent or create a damp problem.

Outside, leaving some seedheads, bark, logs and dry leaf litter gives native insects alternative winter shelter. A simple ladybird lodge can be filled with dry twigs, leaves and pine cones and placed somewhere stable and protected from heavy rain.

What is ladybird in Welsh?

One established Welsh name is buwch goch gota. It appears in Welsh Government Hwb nature resources. The name is delightfully memorable, but this article does not use it to label a particular species: harlequins, seven-spots and two-spots are biologically different ladybirds.

For more ways to make a garden useful to wildlife, read our guide to No Mow May in Wales. If you enjoy seasonal wildlife stories, see where red squirrels still live in Wales.