
Plexes and small buildings
- Duplexes and triplexes
- Fourplexes and sixplexes
- Apartments above a storefront
- Rooming houses
- Small self-managed condos

Plexes, rental buildings and condos
In a building, one unit's infestation quickly becomes the neighbours' problem. We check the unit in question, the ones that share its walls and floors, and the common areas, then help you get tenants ready before we treat, by the rules.
Cockroaches, bed bugs and mice don't stop at a unit's door. They travel through shared walls, floors, plumbing stacks and ducts, and the insects also hitch a ride on furniture and boxes during moves. For mice, our page on mice in the walls shows the routes they use. Treating one unit while the one next door stays infested means you may have to start over. Montreal public health takes the same view: it recommends also inspecting the units above, below and beside the affected one, as well as common areas.
Responsibilities are shared. The landlord must keep the dwelling in good habitable condition and comply with sanitation rules, and the tenant must keep the unit clean and tell the landlord about any serious problem, as the Tribunal administratif du logement points out. In Montreal, the by-law on the sanitation, maintenance and safety of dwellings (03-096) requires dwellings to be free of pest insects and rodents. That by-law applies in the boroughs of the City of Montreal, not in the island's separate municipalities such as Dorval or Pointe-Claire; elsewhere, check with your municipality.
We start with the unit where the problem was reported, then check the ones that share a wall, floor or ceiling with it. That's often where we find the source of the infestation, or where it's headed next.
Treatment works when every unit is ready. We explain the instructions to pass on for each pest: emptied cabinets for cockroaches, fabrics sealed in bags for bed bugs.
Garbage rooms, chutes, laundry rooms, basement lockers and hallways are crossroads for pests. We inspect them along with the units.
Write down the date of every complaint, every notice to tenants and every visit. Those records will help if a file ends up with the City or the Tribunal administratif du logement.
When these signs add up, the problem has probably spread beyond the unit where it was reported.
The method doesn't change, but it's organized at the scale of the whole building.
We inspect the affected unit, the adjacent units and the common areas, then identify the pest and the routes it uses.
You notify tenants within the required time; we give you the prep instructions to hand out, depending on the pest.
We treat the units involved and the common areas with registered products, at the same time whenever possible, so pests don't take refuge next door.
We point out the gaps to seal, such as pipes, baseboards and door sweeps, and follow up in units where activity persists. For rodents, see also sealing entry points.
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Call 514-231-1615Except in an emergency, a landlord must give 24 hours' notice, verbal or written, before entering a unit to check its condition or do work, as the Tribunal administratif du logement points out. For an extermination, give more notice when you can: emptying cabinets or running fabrics through the dryer takes time. Written notice, along with the prep instructions, leaves a record and avoids misunderstandings. For a specific legal question, check with the Tribunal.
Explain that treating their unit also protects the neighbours, and offer another time. Once notice has been given, the tenant must let the landlord check the unit's condition and carry out work. If there's a dispute, the Tribunal administratif du logement can order access or set its conditions.
Not always. Once the affected unit, its neighbours and the common areas have been inspected, we treat wherever there's activity. For bed bugs, the City of Montreal requires landlords to let the exterminator visit the entire building to assess how far the infestation has spread.
In Montreal, if nothing is done within a reasonable time after the tenant's notice, the tenant can contact the City through 311. The City can then decide to inspect the unit, require corrections and issue fines if the by-law isn't being followed. The tenant can also turn to the Tribunal administratif du logement, which can, among other things, order work, reduce the rent or cancel the lease. Acting on the first notice avoids getting to that point.
The price depends on the number of units to inspect and treat, the pest involved, the condition of the common areas and the follow-up required. The free quote is prepared after we've walked through the building.

Service 24/7. A technician answers and comes to you quickly in Montreal, Laval and on the South Shore. Quotes are free.