Yes. Fleas can live in a home with no cat or dog, and it happens more often than people expect. They can come from the last owners' pets, from wild animals or birds living in or around the house, or be carried in on your clothes from somewhere that already has fleas.
This post explains where fleas come from when there are no pets, why they can appear all of a sudden, how to check the bites are fleas, what you can safely do yourself and when to call a professional. It's a common worry in autumn and winter, when spare rooms are opened up for visitors and wild animals look for shelter in lofts and under floors.
Where fleas come from when you don't have pets
The most common sources are:
- The last occupants' pets. Fleas and their eggs can survive dormant for long periods, sometimes up to 18 months, so a house can have fleas waiting before you even move in.
- Wild animals. Feral cats, foxes and other wild animals are the most common carriers of fleas. One sheltering under decking, a shed or the floor can bring fleas right up to the house.
- Birds and their nests. Nests in the loft, eaves or chimney can hold fleas, which can find their way into the rooms below.
- Rats, mice and squirrels. Animals living in the loft, wall cavities or under the floor carry fleas too.
- Carried in. Fleas can hitch a ride on your clothes, skin or hair after you visit an infested home, and a visiting pet can leave eggs behind.
Why fleas can appear all of a sudden
A flea goes through four stages: egg, larva, pupa and adult. The pupa is a sticky cocoon that dust clings to, so it's very hard to see. Around 95% of flea eggs, larvae and pupae live in the home rather than on an animal, deep in carpets, gaps between floorboards and soft furnishings.
A fully formed flea can wait inside its cocoon until it senses a host nearby, through vibration, warmth or the carbon dioxide we breathe out. That's why a spare room that hasn't been used for months, or a house that stood empty before you moved in, can suddenly seem full of fleas as soon as people start walking about.
The cat flea causes about three in four flea problems in UK homes, and it will happily bite people. But a female cat flea needs to feed on an animal to lay eggs that hatch. So if fleas keep turning up in a home with no pets, an animal is often still feeding them somewhere: in the loft, under the floor or just outside.
How to tell if it's fleas
Flea bites are small red spots, about 5 mm across, often in lines or clusters. Adults are usually bitten on the ankles and lower legs, while children can be bitten almost anywhere because they sit and play on the floor.
The fleas themselves are dark brown, around 2 to 3 mm long and fast. A simple check is to walk slowly across the carpet in white socks, then look for dark specks that jump.
If the bites appear mainly overnight on your arms, neck and shoulders, bed bugs are worth ruling out, as they live in mattress seams and bed frames rather than carpets.
Try not to scratch, as this can lead to infection. If a bite becomes swollen, painful or infected, speak to a pharmacist. If you have signs of a severe allergic reaction, such as swelling of the face or difficulty breathing, call 999.
What you can safely do yourself
These steps won't always clear an infestation on their own, but they help, and they make any treatment work better:
- Vacuum every day. Do carpets, rugs, sofas, under beds, stairs and along skirting boards. The vibration draws fleas out of their cocoons, and the vacuum lifts eggs and larvae. Empty it into a bag and put it in an outside bin each time.
- Wash bedding and throws hot. Wash bed linen, throws and cushion covers at the hottest temperature the fabric allows, preferably 60°C or higher.
- Use every room. Walk through spare rooms and rooms you rarely use, so any fleas waiting there hatch now rather than in a month's time.
- Look for the source, without touching it. Listen for scratching in the loft, and look for droppings, gnaw marks or nesting material. Don't move nests or handle wild animals yourself.
- Be careful with shop-bought sprays. If you use one, follow the label exactly, put food away, cover any fish tanks and keep everyone out until the room has been aired.
When to call a professional
It's time to get help if:
- several people in the house are getting bitten
- you're still being bitten after a week or two of daily vacuuming
- you've just moved in and fleas are in several rooms
- you think the source is in the loft, under the floor or in a wall
If the fleas are coming from rats or mice, clearing the fleas alone won't last. Our rodent control service deals with the animals and how they're getting in. After a flea treatment it's normal to see some fleas for a week or two, as the last ones hatch from their cocoons and cross the treated floor.
How we deal with fleas in a home without pets
We start with a room-by-room survey to find where the fleas are living, and look for the animal or nest that brought them in. We then use registered insecticidal products where they're needed, alongside non-chemical options such as steam and vacuuming for soft furnishings. You'll get clear aftercare advice and a follow-up check, so you know the problem has gone and why it started.
If you're getting bitten and there are no pets in the house, Pegasus Pest Solutions can find out where the fleas are coming from and clear them. Book a visit through our flea and bed bug control service.
