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Bed bug extermination in Montreal

An honest comparison of the methods — limitations included — what a real case actually looks like, and what Quebec law says about who has to pay. Written by a certified applicator, not a marketing department.

Mehdi Bouraya · CD5 certified applicator no. 402569085 · Updated July 26, 2026

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The four methods, and what none of them do

Every method has a real limitation. An exterminator who mentions none of them is selling you a package, not a diagnosis.

Heat treatment

How it works
The entire room is raised to 50–60 °C for several hours using industrial heaters, with probes verifying temperature at the core of mattresses, box springs and baseboards.
Actual effectiveness
Kills every life stage in a single intervention, eggs included. That is heat's one decisive advantage: no other treatment reliably destroys eggs in one pass.
Preparation required
Removal of heat-sensitive items: candles, vinyl records, aerosols, medication, fragile electronics, plants, pets. Preparation is lighter than for chemical treatment — no need to bag everything.
Cost
The most expensive method per intervention, but often the cheapest overall when it avoids three follow-up visits.

Limitation

No residual effect: a bed bug arriving from the neighbouring unit the next day survives. In a plex or shared-wall building, heat alone leaves the door open to reinfestation.

Residual chemical treatment

How it works
Targeted application of Health Canada approved insecticides in harbourages: mattress seams, bed frames, baseboards, cracks, behind picture frames and outlet plates.
Actual effectiveness
Kills bed bugs on contact and for several weeks after application. It is this residual effect that catches individuals hatching after the technician has left.
Preparation required
Demanding preparation: hot washing and drying of all textiles, bagging, clearing baseboards and closets. This is where most treatments fail.
Cost
The most affordable per visit, but two visits must be budgeted, sometimes three.

Limitation

Eggs are not reliably reached, and a classic product's residual effect fades before they have all hatched. That is exactly the limitation the biological barrier removes, by staying active for several weeks.

Dry steam

How it works
Steam above 100 °C applied slowly to surfaces where neither room heating nor product application is possible: mattresses, sofas, curtains, carpets.
Actual effectiveness
Excellent at the point of contact, eggs included. Useful as a targeted complement on upholstered furniture.
Preparation required
Minimal, but textiles must be able to dry completely afterwards.
Cost
Low on its own, almost always billed within a combined package.

Limitation

Does not penetrate deep cracks or wall voids. Never sufficient on its own for an established infestation.

Biological barrier — our method

How it works
A discreet biological barrier is applied in strategic areas. Bed bugs cross it, return to their harbourage, and the treatment then acts on the infestation. Added to that: steam on the mattress and sofa — the only surfaces where no product can be applied — and targeted treatment of structural harbourages.
Actual effectiveness
This is our primary method. Its decisive advantage: the effect persists for weeks after the visit, so the young that hatch later encounter it too. That is what usually avoids a second intervention.
Preparation required
Lighter than a classic chemical treatment: the barrier does not require emptying everything. We provide a detailed sheet per unit and explain why each step matters.
Cost
The best result-to-price ratio in an occupied dwelling, all the more so since one intervention is enough in most files. Free inspection and quote, firm price before the work.

Limitation

The effect is not instant: bed bugs must cross the barrier and return to their harbourage. Activity is therefore still visible in the first days — that is expected, and we explain it before the intervention rather than after.

What a real case looks like

A bed bug infestation is not solved in one visit. Here is the schedule we follow, and why each step exists.

  1. 1

    Day 0 — Inspection

    Species confirmation, mapping of harbourages and travel routes, assessment of infestation level and at-risk units. That reading determines where the barrier goes.

  2. 2

    Days 1–3 — Preparation

    The client follows the preparation sheet given at inspection. This step determines the outcome: a poorly prepared unit will defeat a technically flawless treatment.

  3. 3

    Day 4 — First treatment

    Biological barrier placed in strategic areas, steam on the mattress and sofa, targeted treatment of structural harbourages. 2 to 5 hours depending on floor area. Re-entry after the safety interval on the label, generally 4 hours.

  4. 4

    Days 14–18 — Follow-up

    Checkpoint at the moment the eggs present during the intervention have hatched. With the barrier still active, those young encounter it in turn. We verify that activity is declining as expected — and step back in if it is not.

  5. 5

    Day 45 — Verification

    Verification inspection. No sign of activity over this period means the file is closed. Otherwise, we return at no charge under the written guarantee.

Who pays? What Quebec law says

This is tenants' most common question, and the one surrounded by the most misinformation.

Who pays the exterminator in a rental unit?

As a general rule, the landlord. Article 1854 of the Civil Code of Québec requires them to deliver a dwelling in good habitable condition and maintain it as such throughout the lease (article 1910). A bed bug infestation is considered an impairment of habitability, so extermination costs fall to the landlord — even where the origin of the infestation cannot be established. The tenant, for their part, must grant access and prepare the unit.

The landlord refuses to act. What is the recourse?

The tenant first sends the landlord a formal written demand, with a reasonable deadline and evidence of the infestation (dated photos, inspection report). Failing action, they may apply to the Tribunal administratif du logement (TAL), which can order the work, authorise the tenant to have the treatment done at the landlord's expense, grant a rent reduction or damages. Keep every written exchange: before the TAL, documentation is what counts.

What does the City of Montreal require?

The By-law concerning the sanitation, maintenance and safety of dwelling units (03-096) prohibits vermin in a dwelling and requires the landlord to engage an exterminator holding a valid permit. The tenant has the corresponding obligation not to impede treatment: refusing access or failing to prepare the unit can be held against them. Municipal inspectors may issue statements of offence.

In a condo building, who is responsible?

It depends on the declaration of co-ownership. In practice, treating a private portion falls to the unit owner, while common portions (hallways, laundry room, service shafts) fall to the syndicate. Because bed bugs move between units, an intervention limited to a single dwelling almost always fails: coordinating inspection of adjoining units is the syndicate's responsibility.

Can a landlord require a "bed-bug-free" unit at signing?

A landlord cannot use a lease clause to transfer their statutory habitability obligation to the tenant: such a clause is without effect. They may, however, require the tenant's cooperation with treatment, which is legitimate. A tenant presented with a lease imposing extermination costs would do well to consult the TAL before signing.

General information current as of July 2026, provided by a pest control company and not a law firm. For an ongoing dispute, contact the Tribunal administratif du logement or a legal advisor.

Four costly misconceptions

Throwing out the mattress solves it.

The mattress harbours only part of the population. The rest is in the bed frame, baseboards and furniture. Discarding a mattress without treatment is expensive and changes nothing — worse, it contaminates the truck, the hallway, and sometimes the neighbour who picks it up off the sidewalk.

Store-bought foggers work.

Foggers do not penetrate harbourages and act mainly as a repellent: they scatter the colony into wall voids and toward neighbouring units. After a fogger, the file becomes longer and more expensive to treat.

Sleeping elsewhere starves them out.

An adult bed bug survives several months without a blood meal. Leaving the bedroom does not starve them: it pushes them to seek a host elsewhere in the dwelling, or next door. Keep sleeping in your bed until treatment — counter-intuitive, but it is the correct instruction.

A clean home can't get bed bugs.

Bed bugs feed on blood, not crumbs. Cleanliness has no bearing on infestation risk: they travel with luggage, second-hand furniture and people. Clutter complicates treatment, but does not cause the infestation.

Go further

Identify a bed bug

Photos, actual size, traces and common mix-ups.

Prepare your home

The full checklist — the step that decides the outcome.

After treatment

What's normal, what isn't, when to call back.

Our service in detail

What the intervention and written guarantee include.

Bed bug extermination by area

Plateau-Mont-RoyalCôte-des-NeigesVilleray–Saint-Michel–Parc-ExtensionMontreal NorthVille-MarieLongueuilLavalMercier–Hochelaga-Maisonneuve

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