Roughly half the infested units in a building are not the ones complaining. That is the finding that makes complaint driven pest management a losing strategy, and it is the reason a building that treats every reported unit promptly can still get worse year over year.
We run property manager bed bug inspections in Toronto and across the GTA, sweeping stacks, floors and whole buildings and handing back a dated record of which units were clear and which were not. We do not treat, so nothing in that record is written by someone with a treatment to sell.

Unaware residents
~50%
About half of confirmed infestations were in units whose residents did not know, across 2,372 apartments studied.
Adjacent units
53%
In a tracked high rise, 53 per cent of units adjacent to an infested unit were themselves infested.
Building spread
41 months
Time from first confirmed introduction to 45 per cent of that building's units being infested.
Units per hour
4 to 6
A canine team clears a one bedroom in ten to fifteen minutes, which is what makes screening a stack affordable.
In 2016, Wang and colleagues published a study in the Journal of Medical Entomology covering 2,372 apartments across 43 buildings. The overall infestation rate was 12.3 per cent, ranging from 3.8 to 29.5 per cent between buildings. Approximately half of the infestations they detected were in apartments whose residents were unaware of them, and only 68 per cent of residents with a confirmed infestation reported any bite symptoms.
That last figure explains the first. A meaningful proportion of people do not react visibly to bed bug bites, so they have nothing to report. Others notice bites and attribute them to something else, and some know exactly what they have and do not tell the landlord, because they expect to be blamed or charged.
The operational consequence is straightforward. If your pest management runs on incoming complaints, you are working from a list that is missing roughly half its entries, and the missing half continues to seed the units around it while you treat the ones that called.
Wang and colleagues tracked a high rise apartment building from its first confirmed introduction and found 101 apartments, 45 per cent of the complex, infested within 41 months. Among units adjacent to an infested unit, 53 per cent were infested. Across the hallway the figure was 45 per cent.
The mechanism was measured directly in a 2015 mark and recapture study by Cooper, Wang and Singh. Marked insects released in six apartments turned up in neighbouring units of five of them, moving to units above, below, beside and across the corridor, with individuals covering at least twelve metres. Of the marked adults recovered next door, 92 per cent were female.
Those studies were conducted in New Jersey rather than Ontario, and no equivalent GTA dataset exists, so treat the percentages as illustrating a mechanism rather than predicting your building. The mechanism is the point. Bed bugs move between units through the building itself, and a unit that reports is a unit where the population has grown large enough to be noticed, which is later than it started.
Toronto Municipal Code Chapter 354 applies to purpose built rental buildings with three or more storeys and ten or more rental units. Both thresholds have to be met, and the words purpose built rental mean condominium corporations are outside the program entirely, including condos with rented units in them.
For buildings that are covered, section 354-3.3 requires the owner to inspect common areas at least once every 30 days, and to inspect any area of the property within 72 hours of receiving information indicating the presence of pests. It also requires measures to prevent the spread of pests into other portions of the property, and the retention of a pest management operator licensed by the Ministry of the Environment.
Section 354-4.1 requires logs of every scheduled and unscheduled pest inspection, recording date, location, the name of the licensed operator and the results including any recommended treatment, along with logs of treatment activity. Those records must be kept for at least 24 months.
One thing the by-law does not require, despite being widely described that way, is a written pest management plan. The phrase does not appear in Chapter 354. What section 354-3.2 requires is a posted schedule of pest control services and published service standards including the timelines a tenant can expect. Notably, subsection B(13)(h) prohibits posting the location of treatment activity, which is worth knowing before anyone puts a unit number on the notice board.
Section 354-6.1 is the provision most relevant to turnover: no person shall rent a unit to a new tenant if the owner or operator is aware of the presence of pests in that unit.
RentSafeTO evaluates covered buildings on a cycle and publishes a score. Evidence or observation of pests in common areas sits in the High Risk category, which carries the heaviest weighting in the scoring. A pest control log with undocumented past inspections or no scheduled next inspection is scored separately as a cosmetic item.
Buildings in the lowest band become candidates for audit. The programme has been revised recently and the specifics change, so confirm the current mechanics with the City rather than relying on any summary including this one. The durable point is that documented, scheduled pest inspection is scored, and an undocumented reactive approach is scored against you twice: once for what gets observed and once for the missing log.
Section 20(1) makes the landlord responsible for maintaining the complex, including the units in it, in a good state of repair and fit for habitation. The Landlord and Tenant Board's own interpretation guideline names infestations of vermin as an example of unfitness, and describes the obligation as very broad.
The guideline also records a real limit. A landlord may argue they are not liable for maintenance problems they were unaware of and could not reasonably be expected to know about. That defence turns on what the landlord knew or should have known, and a documented programme of proactive inspection is precisely the evidence that settles that question, in either direction. It is worth understanding that a record of inspection cuts both ways: it can show reasonable diligence, and it can show that a problem was identified and not acted on.
What the Act does not contain is any obligation to inspect adjacent or adjoining units when one unit reports. There is no such section, and content claiming otherwise is wrong. In Toronto the nearest enforceable requirement is the 72 hour inspection duty and the prevent the spread duty in Chapter 354, which apply only to covered buildings. Outside those buildings, inspecting neighbouring units is prudence rather than obligation. It is still the right call, for the reasons in the section above.
This is general information about how the Act and the by-laws work rather than legal advice. For a specific building or a live dispute, speak to a paralegal or a lawyer.
The unit of inspection that makes sense in a multi-residential building is rarely the single apartment. When a unit reports, we inspect the reported unit, both neighbours, and the units directly above and below, which is the shape the dispersal research supports. Where two units on a floor have reported inside a few months, or where a building has a known history, the floor or the stack is the sensible scope.
A canine team covers a one bedroom in ten to fifteen minutes. That is the economics of the whole thing. Screening twelve units for the cost of treating one is a decision most managers make quickly once the arithmetic is in front of them, and it is not a decision that is available with visual inspection, which is too slow and too expensive at that scale.
A vacant unit is the easiest thing in a building to inspect and the hardest to judge by eye. Nothing is feeding, so the population retreats into harbourage and goes quiet, and a freshly painted empty apartment shows nothing at all. Adult bed bugs survive for months without a blood meal, and a field study that monitored a vacated apartment recovered live insects at 134 days and found the population still present at 155 days when the study ended.
Checking a unit before a new tenant arrives costs a fraction of what follows if they arrive, get bitten in week three, and nobody can establish who introduced what. It also engages section 354-6.1 directly, since a covered building cannot re-rent a unit where the owner is aware of pests, and awareness is a question of what was checked.
Every sweep produces a dated written report naming the units covered, the locations where the dog alerted, whether each alert was visually confirmed, and what we recommend. Units that were clear are recorded as clear, with the date, which is the half of the record that turns out to matter when a tenant application arrives eighteen months later.
Because we do not treat, the report is not attached to a quote and there is no commercial reason for it to say one thing rather than another. That is what makes it usable as third party evidence at the Landlord and Tenant Board, and it is why paralegals on both sides ask for this kind of document. Our guide on what evidence the LTB actually wants covers that in more detail.
Entry to a tenanted unit requires 24 hours written notice under section 27 of the Residential Tenancies Act, specifying the reason, the date and a time between 8 a.m. and 8 p.m. The Board's guideline is clear that the notice must specify a time rather than a broad window, and inspecting to determine whether repairs are required is one of the permitted grounds. We will work to whatever notice process your office already runs and we do not serve notices ourselves.
Discretion is part of the job in a residential building. Handlers arrive in an unmarked vehicle, the dog works on a short lead, and we do not discuss findings with anyone in a corridor. For covered buildings, remember that Chapter 354 prohibits posting the location of treatment activity on the notice board, so unit numbers stay off it.
Per unit pricing falls sharply with volume, because the cost of a sweep is mostly travel and setup rather than time in the unit. A single unit inspection is priced like a residential job. A stack or a floor is priced per unit at a fraction of that, and a recurring building programme is quoted annually.
The comparison worth running is not inspection against nothing. It is the cost of screening a stack against the cost of treating the units in that stack one at a time over the following two years, plus the abatement exposure if a tenant applies to the Board and the building has no record of what it checked. Our guide on inspection costs sets out the residential range and what moves it.
No. Chapter 354 covers purpose built rental buildings with three or more storeys and ten or more rental units. Condominium corporations are outside it, including condos with rented units. Condo obligations come from the Condominium Act and the corporation's own declaration instead.
Not under the Residential Tenancies Act, which contains no such provision. In Toronto, Chapter 354 requires a covered building to inspect any area of the property within 72 hours of information indicating pests and to take measures preventing spread, which in practice points the same way.
A canine team clears a one bedroom in ten to fifteen minutes, so a normal day is around twenty to thirty units depending on size, access and how many doors actually open.
We note it and move on, and the report records the unit as not accessed with the date. We do not negotiate entry, serve notices, or press a tenant at the door. That is your office's process and your legal ground, not ours.
That is what it is written for. It is dated, it names locations rather than making general assertions, and it comes from a company with no treatment to sell on the back of the result. Whether it helps in a given case is a question for your paralegal.
No. We only detect and report. Your existing pest control contractor treats, and a location specific report generally makes their work faster and cheaper than treating a whole unit on principle.
Landlord and Tenant
The first two weeks decide whether this costs you one unit or a floor. A practical sequence for landlords and property managers.
Read guideLandlord and Tenant
The corporation maintains the common elements and the owner maintains the unit. Bed bugs move through both, which is where most condo disputes start.
Read guideLandlord and Tenant
They do, it has been measured, and the dispersing insect is usually a mated female. The harder problem is that roughly half the people in an infested unit do not know.
Read guideTell us the building, the unit count and what has been reported so far, and we will come back with a scope and a price. Call 289-906-4256 or send the details through the form.
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