Residential Bed Bug Inspections for Homes and Condos

It is worth knowing that finding nothing by eye proves very little, because the reaction people are working from is unreliable in a specific and well documented way.

The first time someone is bitten, there is often no visible reaction at all, or one that appears eight to ten days later. Sensitivity builds with repeated exposure. In one clinical series the average delay between a feeding and a visible reaction fell from about 8.4 days on the first exposure to 2.1, then 1.5, then 1.3 days as exposure continued.

Two things follow from that. Someone can be bitten for over a week before they see anything, by which point the insects have moved and fed again. And in a household of four, one person can be covered in marks while nobody else has a single one, which is the situation that leads people to conclude it must be something else.

The absence of bites does not rule out an infestation, and the presence of bites does not confirm one. That is why the useful question is not what your skin is doing but whether there is detectable bed bug activity in the room, which is a different question with a different method.

A visual inspection finds live insects, shed skins, eggs and faecal staining in the places a person can reach and see. That works when an infestation is established and sitting on a mattress seam. It is weakest exactly where most residential calls sit, which is a small population in a large space with a lot of places to hide.

A trained canine works from airborne scent rather than sight, so the search includes places nobody can open up. The wall void behind a headboard bolted to the wall, the underside of a fitted wardrobe, the gap under a floating floor and the cavity behind a baseboard are all inside the search rather than outside it.

In a detached house the infestation is almost always something that came in with a person or an object. In a multi-unit building it can arrive through the building itself, and that changes what a clear result in your own unit is worth.

Research on movement between apartments has recovered marked bed bugs in neighbouring units of five out of six release apartments, moving above, below, beside and across corridors, with individuals travelling at least twelve metres. Of the marked adults recovered next door, 92 per cent were female. One gravid female arriving from a neighbouring unit is enough to start again.

So if you live in a building and your unit is clear, that is genuinely good news about today and says nothing about the unit next door. Where an infestation has already been confirmed nearby, the useful scope is your unit plus the neighbours, and we can quote that. If you rent, our guides on who pays for treatment in Ontario and on what the Landlord and Tenant Board accepts as evidence set out where you stand.

People discard a mattress within days of the first bite more often than any other reaction, and it is almost always premature and expensive. If the infestation is not confined to the mattress, and it usually is not, the replacement gets infested by whatever is still in the room, and you have paid twice for the same problem.

The same applies to bagging clothing, buying retail sprays and steam cleaning. Retail products rarely resolve an infestation, and they contaminate the environment a detection dog is reading, which makes an accurate inspection harder afterward.

The order that works is find out first, treat what is actually there second, verify third. Our guide on preparing for an inspection covers what to do and what to leave alone, and the short version is that most advice online is written for treatment preparation, which is close to the opposite of what detection needs.

Clear a walking path so the handler and dog can move around the bed and along the walls. Put pets in a closed room or take them out. Turn off fans, air purifiers and portable air conditioners for an hour beforehand, because moving air disperses scent.

Do not strip the bed, do not vacuum or steam clean in the twenty four hours before, and do not move furniture or belongings between rooms. Moving a suspect chair from the bedroom to the living room before an inspection produces a result that tells you something misleading about your own home.

Write down what you have noticed and when, which room, which side of the bed, and anything already treated. The handler works the whole space regardless, but the history changes how the report reads.

Findings verbally before we leave, and a written report the same day listing every area covered, every location the dog alerted on, whether each alert was visually confirmed, and what we recommend.

Where nothing is found, the report records the areas covered as clear with the date. That document matters more than people expect. It is what a landlord, an insurer, a condo corporation or a Landlord and Tenant Board adjudicator reads when the question is what was known and when.

Because we do not treat, there is no quote attached to a positive result and no commercial reason for the report to say one thing rather than another.

Controlled research measured trained detection dogs at 97.5 to 98 per cent detection with no false alerts, sensitive down to a single adult insect or five viable eggs. Field research found performance varying considerably between individual teams, with certification alone not predicting it. The method matters as much as the dog.

In a home that means every room gets two full sweeps rather than one, working the room in a different direction the second time. An alert counts only when she repeats it in the same spot on that second pass, which is what separates a genuine indication from a dog reading her handler. The handler then opens up the location and checks it by hand while you watch.

In the report, alerts and visual evidence are separate lines. If the dog indicated behind a baseboard and nothing could be seen, it says exactly that rather than claiming a find. She is rewarded only on a confirmed alert, which is what keeps her accurate across hundreds of homes rather than drifting toward alerting because alerting earns the toy.

If you can see live bed bugs on a mattress seam, call an exterminator. Their inspection is free, it will confirm what you can already see, and you need their treatment anyway. Paying us to tell you what is in front of you would be a waste of your money.

If your budget covers either an inspection or a treatment and there is visible evidence, spend it on the treatment. We would rather say that than take the booking.