Fleas in the house are frustrating because the ones you can see are only a small part of the problem. The adult fleas jumping onto your ankles or your pet are the last stage of a life cycle that mostly happens out of sight, in carpets, sofa cushions, pet beds and the gaps between floorboards.
That is why a quick spray or a single deep clean rarely finishes the job. To get rid of fleas in your house for good, you need to treat your pets, treat the home and keep going for long enough to catch the fleas that have not hatched yet.
Quick answer: how do you get rid of fleas in your house?
Treat every pet in the home at the same time with a vet-recommended product, wash pet bedding and throws on a hot wash, then vacuum carpets, rugs, sofas and floor edges every day. Treat the rooms with a suitable household flea product used exactly to the label. Expect newly hatched fleas for two to three weeks as dormant pupae emerge.
Why fleas in the house are hard to get rid of
The cat flea (Ctenocephalides felis) is the most common flea in UK homes, and despite the name it happily lives on dogs too. Once an adult female has fed, she can lay up to 40 to 50 eggs a day. Those eggs are not sticky. They drop off your pet wherever it walks, sleeps and sits, which is why the house ends up carrying most of the infestation.
According to the British Pest Control Association, around 95% of flea eggs, larvae and pupae live in the environment rather than on pets. So treating the dog or cat alone leaves most of the problem in place.
| Life stage | Where you will find it | What you need to know |
|---|---|---|
| Eggs | Carpets, pet beds, sofa cushions, anywhere the pet rests | Hatch in a few days. Vacuuming removes many of them |
| Larvae | Deep in carpet pile, floorboard gaps, under furniture | Avoid light and feed on flea dirt. Need some humidity to survive |
| Pupae (cocoons) | The same hidden spots as larvae | The cocoon protects them from insecticides. They can wait weeks or months to hatch |
| Adults | On pets, and jumping onto people nearby | Only a small share of the total. Start laying eggs soon after their first feed |
The pupal stage is the one that catches people out. A fully formed flea can sit inside its cocoon until it senses a host nearby. The BPCA notes that vibration, pressure, heat, noise and carbon dioxide can all trigger it to hatch. Under household conditions the whole cycle usually takes a few weeks, but it can stretch to several months when conditions are cool or there is nothing to feed on.
Signs you have fleas in the house
Most people realise they have fleas in one of a few ways. Often it is more than one at once.
- Bites on the ankles and lower legs. Flea bites are usually small, itchy red spots, often in clusters below the knee. Our guide on what flea bites look like covers how to recognise them.
- A pet that keeps scratching, nibbling at its back or the base of its tail, or losing patches of fur.
- Flea dirt. Tiny dark specks in your pet's coat or on its bedding. This is digested blood passed by adult fleas.
- Fleas you can see. Small, dark brown, flattened insects that jump rather than crawl, often noticed on pale carpets or socks.
- One room that feels worse than others, usually wherever the pet sleeps or the room that has been shut up for a while.
If you are in Tonbridge, Tunbridge Wells, Sevenoaks or elsewhere in West Kent and the fleas are already in several rooms, our flea treatment service can treat the whole property, or you can call us on 07897 314478 for advice first.
A simple check is the white paper test, which the RSPCA recommends. Comb your pet with a fine-toothed flea comb over a sheet of white kitchen paper, then dampen any dark specks. If they turn reddish-brown, it is flea dirt, and your pet almost certainly has fleas.
If you are not sure whether you are dealing with fleas or something else, the bite pattern and where it happens are a good clue. Our comparison of bed bugs vs fleas explains the differences.
How to get rid of fleas in your house, step by step
The steps below work together. Skipping one, especially the pet treatment or the daily vacuuming, is the most common reason a flea problem drags on.
1. Treat every pet at the same time
Treat all dogs and cats in the household on the same day, even the ones that do not seem itchy. Ask your vet which product is right for each animal, as the right choice depends on species, age and weight. Never use a dog flea treatment on a cat. Some contain permethrin, which is highly toxic to cats. Keep pets on regular treatment afterwards so that any newly hatched fleas that jump on are killed before they can lay eggs.
2. Wash bedding and soft furnishings
Wash pet bedding, blankets, throws and cushion covers on the hottest wash the fabric allows, and tumble dry where you can. Do the same for your own bedding if a pet sleeps on the bed. Heavily soiled pet beds that cannot be washed properly are often better replaced.
3. Vacuum every day, and do it thoroughly
Vacuuming is one of the most effective things you can do. A study at Ohio State University found that vacuuming killed an average of 96% of adult cat fleas and all of the larvae and pupae tested. It also lifts the carpet pile so treatments reach deeper, and the vibration encourages pupae to hatch out, where they can be dealt with.
- Vacuum all carpets and rugs, going slowly and in more than one direction.
- Use the crevice tool along skirting boards, around radiators and in gaps between floorboards.
- Do sofas and chairs, including under and between the cushions.
- Vacuum under beds and furniture, and inside the car if your pet travels in it.
- Empty the vacuum or change the bag outside and put the contents straight in the outside bin.
4. Treat the house
A household flea spray, applied exactly as the label directs, can treat carpets, rugs and soft furnishings that pets use. Always check the product is suitable for the surface, keep pets and children out of the room until it is dry, and take fish tanks and bird cages into account, as some products are harmful to them. Pay particular attention to the places pets sleep, under furniture and along the edges of rooms, because larvae move away from light and settle there.
5. Keep going for at least three to four weeks
This is the step people drop too early. Carry on vacuuming daily and keep pets on their treatment for at least three to four weeks. You are waiting for every pupa in the house to hatch, and each newly hatched flea needs to meet a treated pet or a treated floor before it can breed.
Why fleas come back after treatment
Seeing fleas a week after treating the house does not usually mean the treatment has failed. It usually means the pupae are hatching on schedule. The cocoon protects the flea inside from insecticides, so no spray can reach it until it emerges.
University of Kentucky entomologists advise that you should expect to see some fleas for a few weeks after treatment, and that retreatment may be needed if adult fleas are still being seen beyond four weeks. Numbers should fall steadily over that time. If they are not falling, something is being missed. The usual reasons are:
- One pet was not treated, or its treatment has lapsed.
- A room was skipped, often a spare bedroom, the car or a pet's favourite spot under the stairs.
- Vacuuming stopped once the first fleas disappeared.
- Fleas are coming in from outside, from a visiting animal or from wildlife around the property.
Fleas in the house but no pets?
It is surprisingly common to find fleas in a home with no pets, and there is nearly always an explanation.
- Previous occupants had pets. Moving into a house or flat that has been empty for a while is a classic trigger. Pupae left behind can wait for weeks, then hatch in numbers once people start walking around again.
- Visiting animals. A neighbour's cat that comes in through an open door or window, or a friend's dog that stayed over, can leave eggs behind.
- Wildlife. Animals nesting in a loft, under a floor or close to the house can bring fleas with them.
- Carried in on people. Flea eggs, larvae and pupae can be carried into and around a home on shoes and clothing, for example after visiting an infested property.
Without pets the steps are the same, minus the pet treatment. Fleas cannot build a lasting population on people alone, but a hatch of pupae in an empty or newly occupied property can still cause a lot of bites in a short time. If you are a landlord dealing with fleas between tenancies, our pest control checklist for landlords covers what to check before new tenants move in.
Why flea problems get worse in autumn
Many people expect fleas to be a summer problem, but in the UK they often become noticeable in autumn. Fleas thrive at around 21 to 29°C. When the central heating goes on, homes stay warm enough for the life cycle to keep running through the colder months, and pets spend more time indoors on carpets, sofas and beds. The PDSA has pointed to milder winters and widespread central heating as reasons flea numbers have increased in recent years.
Autumn is also when a lot of pupae that have been waiting through the summer start hatching as the house gets busier and warmer. If your pet's flea treatment has lapsed over the summer, this is when you will notice.
What not to do
- Do not rely on flea bombs or foggers alone. They release insecticide upwards into the air, so it often does not reach the places fleas develop, such as under furniture and deep in carpet pile.
- Do not use dog flea products on cats, and do not use pet flea treatments on people or in ways the label does not allow.
- Do not stop vacuuming once you stop seeing fleas. The next batch of pupae may not have hatched yet.
- Do not treat just one room. Pets and people carry eggs around the house, so treat everywhere the pet goes.
- Do not mix products or make homemade insecticides. Use products only as their labels direct.
For bites, keep the skin clean and try not to scratch. A pharmacist can advise on creams or antihistamines. Contact NHS 111 if a bite looks infected or you are worried, and call 999 if someone has signs of a severe allergic reaction, such as difficulty breathing or swelling of the face or mouth.
When to call a professional
Most mild flea problems in a home with one pet can be cleared with the steps above. It is worth getting professional help when:
- You are still seeing plenty of fleas after three to four weeks of treating pets and vacuuming.
- Several rooms, or the whole house, are affected.
- You have moved into a property and fleas appeared soon after, with no pets of your own.
- Someone in the home is reacting badly to bites, or there are young children or vulnerable people in the house.
- You are a landlord or letting agent and need the property treated between tenancies.
What a professional flea treatment involves
A professional treatment starts with finding out where the fleas are breeding, not just where they are biting. A technician will ask about pets, which rooms are worst and how long it has been going on, then check the places larvae collect: pet sleeping areas, carpet edges, under beds and sofas, stair runners and any rooms that have been shut up.
Before the visit you will normally be asked to:
- Make sure every pet has been treated by, or on the advice of, your vet.
- Wash pet bedding and any loose fabrics on a hot wash.
- Clear floors of toys, clothes and clutter so carpets and floor edges can be reached.
- Vacuum thoroughly, including edges and under furniture.
- Plan for people and pets to be out of the treated rooms until surfaces are dry.
The technician treats carpets, rugs, floor edges and suitable soft furnishings with professional products, applied safely and in line with the label. Afterwards you will be told when it is safe to go back into the rooms and when to start vacuuming again, as that depends on the treatment used. Expect to see some newly hatched fleas for a couple of weeks. That is normal, and it is a sign the pupae are emerging into a treated home.
Frequently asked questions
How long can fleas live in a house without pets?
A newly hatched adult flea that cannot find a host will usually only survive for days to around two weeks, depending on temperature and humidity. Pupae are the long-lasting stage. They can wait in their cocoons for weeks or even months, which is why fleas can appear in a property that has been empty for some time.
Can fleas live in your bed?
Fleas can end up in a bed, especially if a pet sleeps on it, and eggs can fall into bedding. They do not live in beds the way bed bugs do, though. Washing bedding on a hot wash and vacuuming the mattress and the floor around the bed deals with them.
Do flea bombs work?
Flea bombs and foggers are rarely effective on their own. The insecticide goes up into the air and settles on open surfaces, so it often misses the places larvae and pupae hide, such as under furniture and deep in carpets. Targeted treatment plus thorough vacuuming works better.
How long after treatment will I still see fleas?
It is normal to see some fleas for two to three weeks after treatment as pupae hatch. Numbers should drop steadily. If you are still seeing a lot of adult fleas after about four weeks, the house may need another treatment or something has been missed.
Can you get rid of fleas in one day?
Not completely. You can kill the adult fleas quickly, but eggs keep hatching and pupae are protected from treatments until they emerge. Getting rid of fleas in your house properly takes a few weeks of consistent effort.
Should I vacuum after flea treatment?
Usually yes, but follow the aftercare advice you were given, as the right timing depends on the product used. Once you are told it is fine to start, regular vacuuming helps because the vibration encourages pupae to hatch and meet the treatment.
Can fleas live on humans?
Cat and dog fleas will bite people, but they do not live on humans the way they live on pets. They jump on to feed, usually around the ankles, and then drop off.
Why do I have fleas in winter?
Central heating keeps homes warm enough for fleas to keep breeding all year, and pets spend more time indoors in colder months. That is why vets usually recommend keeping pets on flea treatment year-round.
Need help with fleas in your house?
If you have treated your pets, vacuumed for weeks and still have fleas, or the problem is across several rooms, and you are in Tonbridge, Tunbridge Wells, Sevenoaks or another area we cover across West Kent and selected nearby parts of Surrey and Sussex, speak to Protego Pest Control.
We are a local pest control team in Tonbridge, BPCA Level 2 trained, part of the Prompt CPD Scheme and fully insured. We are available for contact 24/7 and will give you straightforward advice based on what you have found. Find out more about our flea treatment in Kent.
Contact Protego Pest Control, call 07897 314478 or email info@protegopestcontrol.co.uk.
Not sure whether those marks are flea bites? Read our guide to what flea bites look like.
