Two Kinds of Home, Two Kinds of Job
Heat treatment in this borough tends to fall into two shapes. One is a flat in a mansion block or a converted terrace, where the rooms are ours for the day but the walls, floors and stairs belong partly to other people. The other is a whole Victorian or Edwardian house, where one family has every floor and the question is how many of them need heating.
What the machines do, why it reaches the eggs and why one visit is usually enough is on the London heat treatment page, for the full explanation. This page stays with the buildings.
A Flat in a Mansion Block
Mansion block flats are often generous inside and awkward to reach. There may be a narrow common stair, a small lift or no lift at all, and a managing agent or porter who likes to know when equipment is coming through the entrance hall. Tell us on the phone which floor you are on and how the building is entered, and if the block has rules about contractors, check them before the day.
Inside, the solid walls work in our favour: they hold warmth well once they are up to temperature. The weak points are elsewhere. A chimney breast with an open flue, an old service hatch, or a gap round a pipe where it passes into the next flat all let heat bleed away, and they are also the routes a bedbug uses to wander next door. We look at each of them before the heaters go on.
Because a block is shared, heat on its own leaves nothing behind for a bug that comes back through the wall later. In most flats we put a light residual at the room edges once the rooms have cooled, and we tell you where it has gone.

A Victorian or Edwardian Terrace
A family house gives us the whole building, which makes planning simpler, but a terrace has its own habits. The rooms are tall, so there is a lot of air to move before the furniture catches up. Sash windows rattle and let warmth out; they stay shut, and we may block the worst draughts for the day. Boards laid over a void, with gaps between them, are exactly where eggs get pushed out of sight, and the thermal camera is how we make sure the heat has reached down into them.
The harder question in a house is how far to go. If the bites are in one bedroom and the signs are there and nowhere else, one room may be the right quote. If two children have been sharing a bed with a parent, or someone has been sleeping on the sofa to escape the bites, the floor as a whole is usually the surer thing to treat, because leaving one room out tends to mean doing it again.
- Loft rooms run hot already and are usually easy to bring up; tell us if there is one.
- Basement or lower-ground rooms can be cold and damp and take longer; mention them too.
- A split flat above or below, where a house has been converted, puts you back in the shared-building position described above.
What We Need to Know When You Ring
The figure we give on the phone depends on the rooms, so the more precise you are, the more useful the quote. Have these to hand:
- How many rooms have signs, and which rooms people have been sleeping in over the last few weeks.
- Whether it is a flat or a house, which floor, and whether there is a lift.
- Anything unusual in the rooms: a piano, a large aquarium, built-in wardrobes, a waterbed.
- Who else is in the building, if it is a flat, and whether anyone next door has mentioned bites.
- Whether you rent, and if so whether the landlord or agent knows yet.
If you are not sure it is bedbugs at all, start with an inspection in Wandsworth rather than booking heat on a guess.

Heat, Chemical, or Neither Yet
Heat suits a period flat or house where the belongings are many and the rooms are full of places to hide: bookshelves, picture rails, old furniture with joints and backs. It suits people who want the problem dealt with in a single day. It does not suit a home where much of the contents cannot take heat and cannot easily be moved out, and it costs more.
Where the signs are caught early in one room of a flat, chemical treatment in Wandsworth can be the sensible, lower-cost route. We will say so on the phone if we think it is.
If you have wool rugs, silk cushions or clothes that cannot go in a hot wash, read our guide to delicate fabrics before the day. If the flat has underfloor heating, the Wandsworth Town page deals with that.
What It Costs
Treatments start from £220, and heat costs more than chemical because of the equipment and the time on site. A whole house costs more than one flat bedroom. Ring 0800 955 1018, give us the room count and the details above, and you will have the figure before anything is booked. For how the borough’s other building types are handled, see the Wandsworth bedbug control page.
← Bedbug Control Wandsworth · Bedbug Heat Treatment London, in full
Bedbug Heat Treatment Wandsworth — Questions
Can you get the equipment up to a top-floor mansion flat with no lift?
Usually, yes, but tell us the floor and the stair when you ring so we can plan for it. If the building has rules about contractors, check them with the managing agent first.
Does an open fireplace cause a problem?
It lets heat escape and can be a route between flats or rooms. We look at it on the day and deal with it before heating starts, so mention any open flues when you book.
Do all the bedrooms in a terraced house need doing?
Not always. If the signs are confined to one room and nobody has been moving between beds, one room may be enough. If people have been swapping beds, we usually quote for the floor.
Will the heat damage old plaster or period woodwork?
The heat is raised gradually and held rather than blasted in. If you have something valuable or fragile, such as an antique piece or a musical instrument, tell us beforehand and follow what we advise about moving it.
Is heat enough on its own in a flat?
Heat kills what is in the room, but leaves nothing behind. In a shared building we normally add a light residual at the edges so anything coming back from next door meets it.
Can I stay in another room during the treatment?
Not in a flat, as a rule, and not in the rooms either side of a treated room in a house. Most people go out for the day and come back once the rooms have cooled.
Bedbug Treatments in Wandsworth
Every service has its own page for Wandsworth: heat, chemical, hotels, commercial premises and inspections.
Heat Treatment Advice
The guides that go into bedbug heat treatment in more depth.

How Heat Treatment Works, and Does It Kill Eggs?
What heat actually does to a bedbug, and why an egg has no defence against it.
Read more →
How Long Does a Heat Treatment Take?
Why one London flat takes four hours and another takes ten, and what decides it.
Read more →
Heat or Chemical: How to Choose
Five questions to ask yourself. Answer them honestly and the right treatment picks itself.
Read more →
Preparing Your Home for Heat Treatment
What to do the week before, the night before and the morning of. A plan, not a list.
Read more →
Can Bedbugs Survive a Heat Treatment?
Sometimes, yes. Here are the five ways it happens, and how each one is avoided.
Read more →Bedbug Control Across Wandsworth
Each area page is written around one situation we deal with.
Tell Us About the Property
Tell us whether it is a flat or a house, which floor, and which rooms have signs, and we will price the heat treatment.