How They Get Into a Room Nobody Sleeps In
A spare room is rarely empty. It holds the suitcases after a holiday, the bags of clothes waiting for the charity shop, the furniture someone gave you, and whoever stayed over last. Each of those can bring bedbugs in, and after a guest leaves nobody is in the bed to notice the bites.
If it was a visitor, our guide on when a visitor brings bedbugs covers raising it with them. If it was luggage, see unpacking after a holiday.

Why Leaving It Empty Does Not Fix It
Bedbugs can go a long time between feeds, so closing the door on the room and waiting is not a plan. What does happen is that they start looking for a host. In a house, that means the room next door, the landing, or the sofa where someone naps in the afternoon.
So an unused room is not only a problem in itself. It is a store that keeps feeding the rest of the house, a few at a time, for as long as it is left alone.
Checking the Spare Room Properly
Because nobody has been bitten in there, you are looking for what they leave rather than what they do:
- Dark spotting along the mattress piping and under the label
- Pale shed skins in the corners of a divan base or along the slats
- Spotting on the screw heads and joints of the bed frame
- Anything similar along the seams of stored bags or folded bedding
- The same signs on the skirting nearest the bed
If you find something you cannot identify, keep it in a sealed bag or photograph it. An inspection starts at £120 and tells you whether it is bedbugs before anything is treated.
Treating a Guest Room
A spare room in Sidcup is often the easiest room in the house to treat, because nobody has to be moved out of it. The catch is what is stored there. For chemical treatment the floor has to be cleared and the bedding washed, which can mean sorting years of boxes first. For heat, most contents can stay, apart from the heat-sensitive list we send you.
Either way, do not carry the stored bags into another room to make space. Leave them where they are and ask us what to do with them.
It is also worth checking the bedroom that shares a wall with the spare room, and the one whose door faces it across the landing. If bedbugs have been in an unused room for a while, those are the first places they go looking. Tell us what you find in each when you ring about the house in Sidcup, and we will say whether one room needs treating or more. The wider picture for family homes across the borough is on the Bexley page.
Bedbug Control Sidcup — Questions
Nobody has been bitten. Why would there be bedbugs?
Because nobody has been in the bed. The bites are what usually gives them away, and in an unused room that warning does not happen.
Should I throw out the spare mattress?
Not before we have seen it. A mattress can usually be treated, and carrying it through the house can spread them to other rooms.
Can I just keep the door shut until the treatment?
Keeping it shut does no harm, but it will not contain them for long. Get it looked at rather than waiting.
Is heat better for a room full of stored things?
Often, because it reaches into boxes and piles without everything being emptied out. It costs more than chemical, and we will say if chemical would do the job.
What should I do with the guest bedding?
Strip it in the room, bag it before it leaves, and hot-wash and dry it. Bedding that was washed and put away before the last guest stayed can still be checked and washed again to be sure.
Elsewhere in Bexley
The other areas in the borough, each written around a different situation.
Bedbug Advice for Sidcup
Picked for this page: the guides that go further on what matters for Sidcup.

When a Visitor Brings Bedbugs
A relative's stay, a guest's bag: how to raise it without a row, and how to treat the guest room.
Read more →
The Places That Get Missed
Beyond the bed and the two-metre radius: the harbourages that survive a mediocre inspection.
Read more →
The Early Signs, and the Timeline
Week one to month six. What is detectable when, and why 'early' is mostly invisible.
Read more →
How Fast Do Bedbugs Spread?
How it grows in one room, how it reaches the next, and the everyday habits that speed it up.
Read more →Bedbug Treatments in Bexley
Every service has its own page for Bexley: heat, chemical, hotels, commercial premises and inspections.
Covering Sidcup
Tell Us About the Property
Tell us what is in the spare room and when it was last used, and we will tell you how we would treat it.