Mouse & Rat Exterminator in Montreal
Rodents chewing through your walls and contaminating your food? Blackline Pest Control delivers complete exclusion, bait station programs, and structural sealing — so they never come back.
Why Rodents Are a Year-Round Problem in Montreal
Montreal's harsh winters drive mice and rats indoors in search of warmth, food, and shelter. The city's aging housing stock — full of foundation cracks, deteriorating mortar, and gaps around utility penetrations — provides countless entry points for rodents that can squeeze through openings as small as 6mm. Once inside, they establish colonies rapidly and are extremely difficult to eliminate without professional intervention.
The house mouse (Mus musculus) and Norway rat (Rattus norvegicus) are the two most common species in Montreal. A single female mouse can produce 5–10 litters per year, with 5–6 pups per litter. An infestation that starts with two mice can grow to over 200 individuals within six months if left untreated.
Beyond the structural damage — gnawed wires, chewed insulation, contaminated food — rodents pose serious health risks. They carry Hantavirus, Leptospirosis, and Salmonella in their droppings and urine. Their constant gnawing on electrical wiring is a leading cause of house fires. In Montreal's multi-unit buildings, a rodent problem in one unit can spread throughout the building via shared walls and utility chases.
Blackline Pest Control's rodent program goes beyond trapping. We conduct a full property inspection to identify every entry point, seal them with professional-grade materials (steel wool, hardware cloth, caulk), install tamper-resistant bait stations, and monitor the program until the infestation is completely resolved.
How We Treat Mice & Rats in Montreal
A complete exclusion-first approach that eliminates the infestation and prevents it from returning.
Full Property Inspection
Our technician conducts a comprehensive interior and exterior inspection, identifying all active entry points, runways, nesting sites, and the extent of the infestation. We document every gap, crack, and penetration that requires sealing.
Exclusion & Sealing
We seal all identified entry points using professional-grade materials: steel wool, hardware cloth, copper mesh, and exterior-grade caulk. This is the most critical step — without exclusion, rodents will simply re-enter after treatment.
Bait Stations & Trapping
Tamper-resistant bait stations are placed along active runways, in wall voids, and in areas of high activity. We use Health Canada-approved rodenticides and snap traps to eliminate the existing population quickly and humanely.
Monitoring & Follow-Up
We return to check bait stations, remove any deceased rodents, and confirm that exclusion work is holding. Our 100-day guarantee means if rodents return after our exclusion program, we come back at no charge.
Pricing & Our 100-Day Guarantee
Single Unit
- Interior inspection
- Bait stations & traps
- Entry point sealing
- 100-day guarantee
Full Exclusion Program
- Full interior & exterior inspection
- All entry points sealed
- Bait stations installed
- 3 monitoring visits
- 100-day guarantee
Multi-Unit / Commercial
- Building-wide assessment
- Exterior perimeter sealing
- Ongoing monitoring program
- Landlord documentation
- 100-day guarantee
100-day guarantee: if rodents return within 100 days of our exclusion work, we re-treat at no charge. A $45 travel fee applies to re-treatment visits outside the Montreal core.
Signs of Mice or Rats in Your Montreal Home or Business
Droppings Along Walls and in Cabinets
Mouse droppings are small (3–6mm), dark, and pointed at both ends. Rat droppings are larger (12–20mm) and capsule-shaped. Finding them along baseboards, in kitchen cabinets, or behind appliances confirms an active infestation.
Gnaw Marks on Food Packaging and Wires
Rodents gnaw constantly to keep their teeth sharp. Look for chewed corners on cereal boxes, gnawed electrical wires (a serious fire hazard), and bite marks on wooden furniture, baseboards, and structural elements.
Tracks and Runways Along Walls
Mice and rats follow the same paths repeatedly, leaving greasy smear marks along walls and baseboards from the oils in their fur. In dusty areas, you may see actual footprints or tail drag marks.
Scratching Sounds in Walls at Night
Rodents are most active between dusk and dawn. Scratching, scurrying, or squeaking sounds coming from inside walls, ceilings, or under floors at night are a strong indicator of an active infestation.
Nesting Materials in Hidden Areas
Mice build nests from shredded paper, fabric, insulation, and plant material. Check behind appliances, inside wall insulation, in attic spaces, and in rarely-opened storage areas for compact, ball-shaped nests.
Musky Ammonia-Like Odour
A strong, musky ammonia smell — particularly in enclosed spaces like closets, under sinks, or in basements — indicates a significant rodent presence. The odour comes from accumulated urine and is a reliable sign of an established colony.
Signes de souris / Señales de ratones
🇫🇷 Excréments le long des murs · Marques de rongement · Traces de pattes · Bruits nocturnes · Matériaux de nidification · Odeur d'ammoniaque
🇪🇸 Excrementos a lo largo de las paredes · Marcas de mordeduras · Huellas · Ruidos nocturnos · Materiales de nido · Olor a amoníaco
We Treat Mice & Rats Across Montreal and Surrounding Areas
Houses, apartments, condos, restaurants, warehouses, and commercial properties throughout Greater Montreal.
High-rise condos & offices
Dense apartment buildings
Residential triplexes
Heritage homes
Suburban homes & condos
South Shore residences
New developments
Industrial & commercial
Riverfront apartments
Family homes & duplexes
Heritage properties
Residential & commercial
Frequently Asked Questions About Rodent Extermination in Montreal
How do mice get into Montreal apartments?
Mice can squeeze through gaps as small as 6mm — the size of a pencil. They enter through foundation cracks, gaps around pipes and utility lines, under doors, through dryer vents, and via shared walls in apartment buildings. Montreal's aging housing stock has many such entry points.
What is the fastest way to get rid of mice in Montreal?
The fastest and most effective approach combines professional exclusion (sealing all entry points) with interior bait stations and snap traps. DIY methods rarely work because they address symptoms, not the source. A professional exterminator can eliminate an active infestation within 1–2 weeks.
Do mice come back after extermination?
Without proper exclusion work, mice will return. Our program includes sealing all identified entry points with steel wool, caulk, and hardware cloth. Our 100-day guarantee covers free re-treatment if rodents return after our exclusion work is complete.
Are rodent bait stations safe around children and pets?
Yes. We use tamper-resistant bait stations that are inaccessible to children and pets. The rodenticide is contained inside a locked housing that only rodents can access. We place stations in areas that are out of reach of children and domestic animals.
What diseases can mice and rats spread in Montreal?
Rodents can spread Hantavirus, Leptospirosis, Salmonella, and Lymphocytic choriomeningitis (LCMV) through their droppings, urine, and saliva. They also carry fleas and ticks that can transmit additional diseases. Prompt professional treatment is essential.
How much does mouse extermination cost in Montreal?
Mouse extermination in Montreal starts at $199 for a single-unit inspection and treatment. Full exclusion programs for larger properties range from $400–$900 depending on the number of entry points and property size. We provide a free inspection and transparent quote.
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Learn MoreWhat Clients Say About Our Mouse & Rat Control Service
Real feedback from Montreal homeowners and businesses we've helped.
“Mice were getting into my kitchen through a gap behind the stove. Blackline found 4 entry points I never would have found myself, sealed them all, and set up bait stations. No mice...”
“Rats in my basement — absolutely terrifying. Blackline came the same day I called, identified all entry points, sealed everything with steel mesh, and set up a bait program. Proble...”
“Had mice in my walls for months. Previous exterminator just set traps. Blackline did a full exclusion — sealed every gap in the foundation and around pipes. Haven't heard a single ...”
“Mice in my heritage home every winter. Blackline did a comprehensive exclusion program and I've had zero mice this winter for the first time in 5 years. Worth every dollar.”
“Fast, professional, and effective. The technician was knowledgeable and explained everything clearly. The exclusion work was thorough and the bait stations were placed strategicall...”
“Good service. The exclusion work took two visits to complete but they were thorough. The technician found entry points in places I never would have checked. Mice are gone and haven...”
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