Bed Bugs in the Mattress?
Keep, Treat or Discard After a Tenant (2026)

Bed bugs after a tenant: why the mattress decision matters

A tenant moves out, the new one moves in, and two weeks later you get a message with a photo of bites on an arm. Or the outgoing tenant admits, on handover day, that they “had a bit of a bed bug problem”. Either way the first question every landlord asks is the same: can I keep the mattress, or does it have to go?

The answer matters more than the price of a mattress. Throw it out the wrong way and you carry the bugs through the corridor, the lift and the bin room, and possibly into the next unit. Keep it without a plan and the next tenant inherits the problem. This guide is about that decision: how to inspect, when keeping is reasonable, how encasements work, and how to dispose of a mattress without spreading the insects. For how the unit itself is treated (heat versus chemical, and what it costs), read the bed bug treatment guide — this page does not repeat it.

Two facts shape everything below. First, bed bugs are hard to eliminate partly because they can survive up to approximately 300 days without feeding, so an empty unit does not starve them out between tenants. Second, the mattress is rarely the only place they live. They hide in bed frames, headboards, sofa seams, skirting gaps and cracks in the wall, so replacing the mattress alone almost never solves an infestation.

How to inspect the mattress properly

Do the inspection before you decide anything, and do it in daylight with a strong torch. An adult bed bug is only about 4–5 mm long, flat and reddish-brown, so you are looking for small things in tight places.

1. Strip the bed completely and bag the sheets, pillowcases and mattress protector straight away.
2. Lift the mattress and inspect all its seams and surfaces, and those of the divan or box base underneath. Run the torch along the piping, the stitched edges, the handles and the air vents.
3. Look for the three classic signs: dark spots of dried excrement, small blood spots where a bug was crushed, and pale shed skins.
4. Check the bed frame joints, the back of the headboard, and the slats. A wooden frame with cracks is a common hiding place.
5. Check the nearest furniture: bedside tables, the sofa or armchair in the same room, curtain folds and the skirting behind the bed.
6. Photograph everything you find, with the date. You will want it for the tenancy record and for the pest control company.

What you find, and what it means

Use what you actually find, not what the tenant says, to judge how serious it is:

Keep or discard: a decision guide

There is no single right answer. Many infested mattresses can be kept if they are treated with the rest of the room and then sealed in an encasement. Discarding is sensible when the mattress is old, damaged or cheap to replace, or when you simply want a clean start for the next tenant. What does not work is replacing the mattress and doing nothing else.

Whichever you choose, treat first. A new mattress brought into an untreated room is simply a new home for the same bugs.

Keeping the mattress: how encasements work

An encasement is a zipped cover that seals the whole mattress, not just the top. Once it is on and closed, any bugs inside cannot get out to feed, and bugs trapped inside encasements will eventually die of starvation. New bugs also cannot move into the seams, and any that appear on the smooth outer surface are easy to spot.

• Use a proper encasement, not a fitted protector. A fitted sheet-style protector leaves the sides and base open.
• Encase the base too if it is a divan or box base with fabric and seams.
• Leave it on. Because bed bugs can survive for many months without feeding, an encasement only works if it stays sealed for a long time. Tell the tenant not to remove it.
• Check the zip and the cover at every inspection. A tear or an open zip defeats the purpose.

Discarding it: how to dispose without spreading bugs

This is where most landlords make the problem worse. A mattress dragged through the living room, down the corridor and into the lift sheds bugs and eggs all the way. Do it in this order:

1. Wrap the mattress completely in heavy plastic sheeting or a mattress disposal bag, and tape it closed, before it leaves the bedroom.
2. Make the mattress unusable: rip the cover and remove the stuffing, so nobody picks it up and takes it home.
3. Mark it clearly as infested with bed bugs, so nobody unknowingly brings it into their home.
4. Do not leave it on the kerb, the porch, the corridor or the common bin area for days. Take it straight to disposal, or arrange collection with your building management.
5. Vacuum the route it took and the bedroom floor afterwards, seal the vacuum bag tightly and throw it out in an outdoor rubbish bin straight away.

In a strata building, tell the management office before you move an infested mattress through the common areas. They would much rather arrange a clean route than deal with bed bugs in the neighbouring units.

Treating the unit is a job for a pest control company

Whatever you decide about the mattress, the room needs treatment if there is an active infestation. Heat kills bed bugs — an hour at 45 °C or over is enough — but getting every crack of a room to that temperature, or applying insecticide properly with a follow-up visit, is specialist work. Treating bed bugs is a job for a pest control company. The bed bug treatment guide linked above explains heat versus chemical methods, how to prepare the room and what to expect. For bedding and clothing, a home tumble dryer on its hottest setting can deliver the heat needed; things that cannot be treated can be sealed in a plastic bag and left there for up to a year.

What mattress cleaning can and cannot do

Landlords often ask whether a professional mattress clean will deal with bed bugs. Be realistic. A strong vacuum aimed at the seams can pick up some bugs and eggs, and cleaning is good hygiene between tenants, but a mattress clean is not a bed bug treatment and nobody should sell it to you as one. The mattress cleaning guide explains what a clean does do: dust mites, sweat, stains and odours. Order matters: treatment first, then cleaning, then the encasement.

Also, bed bug bites are not known to transmit any infectious disease. That does not make an infestation acceptable, but it does mean the problem is itching, sleep and reputation, and the fix is method and follow-through rather than panic.

Turnover checklist for landlords

The cheapest bed bug problem is the one you catch between tenants. At every turnover of a furnished unit:

• Inspect every mattress, bed frame and upholstered chair using the steps above, and photograph the result.
• If anything is found, arrange treatment by a pest control company before the next tenant moves in, not after.
• Think twice before furnishing with second-hand beds or mattresses; if you do, inspect them thoroughly before they come into the unit.
• Book a full move-out clean after treatment; the move-in and move-out cleaning guide sets out the scope.
• Record the condition in the inventory and tenancy file. Who pays for what is covered in the landlord vs tenant repair responsibility guide.
• Fix the building gaps described in the next section while the unit is empty.

Building repairs that remove hiding places

Bed bugs hide in cracks. Sealing cracks and crevices removes hiding places and brings the bugs out into the open, which makes any treatment more effective and later checks easier. This is building work, and the turnover gap is the right time to do it:

• Seal gaps along the skirting and where the skirting has pulled away from the wall.
• Fill cracks in the plaster and around door frames and window frames in the bedroom.
• Seal around pipes and cables where they pass through walls, so bugs cannot travel between rooms or units through the gaps.
• Re-fix or replace loose wall panels, cornices and headboard panels that leave a gap behind them.
• Replace a damaged wooden bed frame or built-in bed platform with deep cracks, through trade coordination.

How ClickBina helps with the turnover

Bed bug treatment is a job for a pest control company, and we will say so. What we do is the building and turnover side: turnover cleaning, sealing cracks and gaps along skirtings, walls and pipe openings, replacing damaged fittings and panels, and coordinating the trades so the unit is ready for the next tenant. We are an experienced KL & Selangor contractor and the price is flat, with no hidden charges. A site visit is RM150, waived if you go ahead. WhatsApp us your job details and we reply within the hour.

Sources & methodology

Inspection steps, the signs to look for, disposal of infested mattresses, encasements, second-hand furniture and the dryer advice are from the University of California IPM guide to bed bugs. Sealed encasements, bagging items for up to a year, ripping and marking discarded furniture, vacuum bag disposal and sealing cracks are from the US EPA do-it-yourself bed bug control guidance. Size, survival without feeding, the heat that kills them and disease transmission are from the Wikipedia article on bed bugs. This guide publishes no treatment prices, because treatment is priced by the pest control company that carries it out.