Why It Can Happen Just After a Neighbour's Treatment
Bedbugs in a flat below do not stay politely on their own side of the ceiling. They follow heating pipes, cable runs and the gaps around them, and they travel further when they are disturbed. A treatment next door is a disturbance: furniture gets moved, beds get stripped, and a few insects that were living near the shared wall or floor can wander up rather than meet the treatment.
That does not mean your flat has an infestation. One insect seen soon after a neighbour's treatment may be a single wanderer. It may also be the first sign of a group that has been in your flat for weeks, carried in by the same route before anyone downstairs noticed. The only way to tell those apart is to look properly.

What to Do With the One You Found
- Catch it if you still can. Clear tape or a small jar with a lid is enough. Keep it; it is the most useful thing you can show anyone.
- Note where it was. Pillow, headboard, skirting by the radiator pipe, near a socket on the shared floor: the spot tells us which route it probably used.
- Check your own bed before anything else. Look along the mattress seams, the corners of the base and the back of the headboard for dark spotting or pale shed skins. The London guide to early signs of bedbugs shows what to look for.
- Leave the furniture where it is. Moving the bed away from the wall or into another room spreads whatever is there.
- Keep sleeping in your own bed. Moving to the sofa tends to take them with you.
Talk to the Neighbour and the Building
Ask your neighbour, politely, which rooms were treated, whether it was heat or chemical, and whether more visits are booked. A chemical course usually runs to a second visit, sometimes a third, and the residue keeps working in between, so the picture below you may still be changing. Heat leaves nothing behind, which is why in shared buildings a light residual is sometimes put around the edges of a treated room.
If the building has a managing agent or a housing officer, tell them in writing what you found and when. Several flats sharing pipes and walls are better dealt with as one problem than one flat at a time. Who arranges and pays for any work depends on your tenancy or lease and on where the problem started; we are pest controllers, not legal advisers.
Getting It Confirmed Before Anyone Pays for Treatment
A single sighting in a Battersea flat is exactly the case an inspection is for. Inspections start from £120. We look at the beds, the sofa, the skirtings and the points where services come up from the floor below, and tell you whether there is anything established in your flat or only a stray.
If there is an infestation, the choice between heat and chemical treatment depends on how many rooms are affected and what is happening below you. Treatments start from £220, heat costs more than chemical, and the figure is given on the phone before anything is booked. The Wandsworth borough page covers how different buildings in the area change the plan.
Bedbug Control Battersea — Questions
Does one bedbug mean my flat is infested?
Not necessarily. After a neighbour's treatment a single stray is possible. Check your bed closely, keep the insect, and if you find any spotting or more of them, book an inspection.
Can the treatment downstairs push them into my flat?
It can disturb them, and disturbed bedbugs move. That is a reason to check your own flat now, not a reason to delay the treatment downstairs.
Should I use a spray from a shop around the pipes?
We would rather you did not. Shop sprays tend to scatter bedbugs further into the wall and floor rather than dealing with them.
Who pays if it came from the flat below?
That depends on your tenancy or lease and on the cause. Report it in writing to your landlord or managing agent and ask them; we cannot give legal advice.
What should I tell you when I ring about a Battersea flat?
Which floor you are on, when the neighbour was treated and how, where you found the insect, and whether you have seen any marks on your bedding.
Elsewhere in Wandsworth
The other areas in the borough, each written around a different situation.
Bedbug Advice for Battersea
Picked for this page: the guides that go further on what matters for Battersea.

Why Bedbugs Reappear After Treatment
Hatching, survival or re-introduction. Three different problems that look identical.
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Inspection First, or Straight to Treatment?
When the £120 saves you money, and when it is £120 you did not need to spend.
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Bedbugs, or Something Else?
A walkthrough you can do tonight with a torch, and what to do with what you find.
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Dining Chairs and Upholstered Seating
Why chairs are usually clear, when they are not, and how to check and treat them.
Read more →Bedbug Treatments in Wandsworth
Every service has its own page for Wandsworth: heat, chemical, hotels, commercial premises and inspections.
Covering Battersea
Tell Us About the Property
Tell us when the flat below was treated and where you found the bedbug, and we will ring you back.