Can Bed Bugs Spread to Sofas?

They Do Not Explore. They Follow

A bed bug in a good harbourage next to a nightly host has no reason to go anywhere. Movement happens when one of two things changes: the harbourage fills up, or the host stops turning up.

A sofa on another floor is a long way in bed bug terms and there is nothing drawing them to it. So when a living room becomes involved, something moved — and it is nearly always a person or a possession rather than an insect.

The Four Routes, Ranked

1. Somebody started sleeping on it

By a very long way the most common. Somebody cannot face the bedroom, moves to the sofa, and takes the problem with them — on their clothing that night, and by presenting a host in a new place over the following weeks. A sofa in nightly use is a bed as far as a bed bug is concerned.

2. Things were carried down and piled on it

Bedding, clothing and bags moved out of a bedroom during a clear-out and stacked on the sofa while the room is dealt with. Hours of contact between infested fabric and upholstery is all it takes.

3. Somebody sits on it in the clothes they slept in

Far less likely than the first two, and not impossible in a household where somebody dozes on the sofa in the morning. The risk is proportional to how long they are still, not to the contact itself.

4. It arrived infested

Nothing to do with the bedroom at all. A second-hand sofa, or one from a house clearance, brought in already carrying them. Worth considering when the living room has evidence and the bedroom genuinely does not.

Catching It Early

A sofa that has just been colonised has very little on it, and it is in a predictable place: wherever the person who moved down there actually lies.

1. The crease where the seat meets the back, at the end somebody's head rests
2. The seam and piping of the two cushions at that end
3. The seam where that arm meets the seat
4. Underneath, at that end, on the dust cover and the frame

Checking the end somebody sleeps on first, rather than the whole sofa evenly, finds it considerably faster.

How To Stop It Happening

• Keep sleeping in the bedroom until it has been treated. This is the whole of the advice and it is the hardest part of it
• Do not pile bedding or clothing on the sofa during preparation
• Bag things in the bedroom and take them straight to the machine
• If somebody has already been sleeping downstairs, say so when you book — the living room is then part of the job rather than a surprise

Maidenhead: Open-Plan and Through Rooms

A lot of Maidenhead housing has knocked-through or open-plan ground floors, which changes one thing: there is no door between the sofa and the rest of the floor. It makes no difference to how the insects travel — they were carried either way — but it does mean treatment and any exclusion period cover a larger space than a single closed room.