Ant Exterminator in Montreal
Carpenter ants destroying your wooden structures? Pavement ants invading your kitchen? Blackline Pest Control eliminates ant colonies at the source with targeted perimeter spray and bait treatments.
Why Ants Are More Than Just a Nuisance in Montreal
Montreal's climate — with its dramatic freeze-thaw cycles, heavy snowfall, and warm humid summers — creates ideal conditions for ant infestations. Every spring, as temperatures rise above 10°C, ant colonies emerge from their winter dormancy and begin foraging aggressively. Montreal's aging housing stock, with its abundance of moisture-damaged wood and foundation cracks, provides perfect nesting conditions for carpenter ants.
The black carpenter ant (Camponotus pennsylvanicus) is the most destructive ant species in Quebec. Unlike termites, carpenter ants do not eat wood — they excavate it to create smooth-walled galleries for their nests. A mature carpenter ant colony can contain 3,000–10,000 workers and cause structural damage that rivals termite infestations. They are particularly attracted to moisture-damaged wood around leaky pipes, roof edges, and window frames.
Pavement ants (Tetramorium caespitum) are less destructive but far more visible — they invade kitchens in large numbers, contaminating food and creating unsanitary conditions. Odorous house ants emit a distinctive rotten coconut smell when crushed and are notoriously difficult to eliminate with DIY methods because their colonies have multiple queens.
Blackline Pest Control uses a combination of exterior perimeter spray, targeted gel bait, and direct nest treatment to eliminate ant colonies completely. We identify the species, locate the nest, and apply the most effective protocol — not just a generic spray that drives ants deeper into your walls.
How We Treat Ants in Montreal
Species-specific treatment that targets the colony, not just the foragers you can see.
Species Identification & Inspection
We identify the ant species and locate the primary nest and satellite colonies. For carpenter ants, we inspect moisture-damaged wood, wall voids, and structural elements. Species identification determines the entire treatment approach.
Exterior Perimeter Spray
We apply a residual insecticide barrier around the entire foundation, window frames, door thresholds, and utility penetrations. This creates a protective zone that kills ants attempting to enter and disrupts foraging trails.
Gel Bait & Direct Nest Treatment
Slow-acting gel bait is applied along ant trails and near entry points. Worker ants carry the bait back to the colony, feeding it to the queen and larvae. For carpenter ant nests in wall voids, we apply dust insecticide directly into the gallery system.
Follow-Up & Prevention
We return to assess treatment effectiveness and reapply as needed. We also provide recommendations for moisture control and structural repairs that will prevent future infestations. Our 100-day guarantee covers free re-treatment if ants return.
Pricing & Our 100-Day Guarantee
Pavement / House Ants
- Perimeter spray
- Gel bait application
- 100-day guarantee
- Follow-up visit
Carpenter Ants
- Full inspection
- Perimeter spray
- Wall void dust treatment
- Gel bait
- 100-day guarantee
- 2 follow-up visits
Commercial / Multi-Unit
- Building-wide assessment
- All species treated
- Ongoing prevention program
- 100-day guarantee
- Documentation provided
Signs of Ants in Your Montreal Home or Business
Ant Trails Along Walls and Counters
Visible lines of ants marching between their nest and a food source are the most obvious sign. Pavement ants form long trails along baseboards and countertops, while carpenter ants are often seen individually foraging at night.
Sawdust-Like Frass from Carpenter Ants
Carpenter ants push wood shavings, insulation fragments, and dead ant body parts out of their galleries. Finding small piles of this "frass" near wooden structures, window frames, or baseboards indicates an active carpenter ant nest inside your walls.
Hollow-Sounding Wood
Tap on wooden beams, door frames, and window sills. If the wood sounds hollow where it should be solid, carpenter ants may have excavated galleries inside. This is a serious structural warning sign requiring immediate professional inspection.
Winged Ants (Swarmers) Indoors
Seeing winged ants — called alates or swarmers — inside your home, especially in spring, indicates a mature colony nearby. Swarmers are reproductive ants leaving to start new colonies. Finding them indoors means the parent colony is inside your structure.
Ants Near Moisture Sources
Carpenter ants are particularly attracted to moisture-damaged wood. Finding them near leaky pipes, around bathroom fixtures, in basement corners, or near roof leaks suggests both an ant problem and an underlying moisture issue that needs addressing.
Ant Entry Points Around Foundation
Inspect your foundation, window frames, door thresholds, and utility penetrations. Ants entering through cracks in the foundation or gaps around pipes are a sign of an outdoor colony that has found a reliable food source inside your home.
Signes de fourmis / Señales de hormigas
🇫🇷 Pistes de fourmis · Sciure de bois · Bois creux · Fourmis ailées · Fourmis près de l'humidité · Points d'entrée
🇪🇸 Rastros de hormigas · Aserrín de madera · Madera hueca · Hormigas con alas · Hormigas cerca de humedad · Puntos de entrada
We Treat Ants Across Montreal and Surrounding Areas
Condos & commercial
Heritage triplexes
Older wooden homes
Heritage properties
Suburban homes & decks
South Shore residences
New developments
Commercial & industrial
Riverfront properties
Family homes
East-end residential
Residential & commercial
Frequently Asked Questions About Ant Extermination in Montreal
What types of ants are most common in Montreal?
The most common ant species in Montreal are carpenter ants (Camponotus pennsylvanicus), pavement ants (Tetramorium caespitum), and odorous house ants. Carpenter ants are the most destructive, as they excavate wood to build their nests, causing structural damage similar to termites.
Do carpenter ants cause structural damage in Montreal homes?
Yes. Carpenter ants do not eat wood, but they excavate it to create galleries for their nests. Over time, this can cause significant structural damage to wooden beams, window frames, door frames, and decks. A large carpenter ant colony can cause thousands of dollars in damage if left untreated.
Why do I have ants in my Montreal home every spring?
Ants overwinter in colonies underground or inside walls. In spring, as temperatures rise, they become active and forage for food. Montreal's freeze-thaw cycles create cracks in foundations and exterior walls that ants exploit as entry points. Annual perimeter treatments can prevent seasonal invasions.
How long does ant extermination take?
A single ant treatment visit takes 1–2 hours. Most infestations are resolved within 1–2 treatments. Carpenter ant infestations with established wall void colonies may require 2–3 visits. Our 100-day guarantee covers free re-treatment if ants return.
Are ant treatments safe for children and pets?
Yes. We use Health Canada-approved products applied in targeted locations. Exterior perimeter sprays are applied to the foundation and entry points. Interior treatments use gel bait in cracks and crevices. Children and pets can return to treated areas once the product has dried, typically within 1–2 hours.
How much does ant extermination cost in Montreal?
Ant extermination in Montreal starts at $199 for a single-unit treatment. Carpenter ant infestations requiring wall void treatment or larger properties may cost $300–$700. We provide a free inspection and transparent quote before any work begins.
Related Services
Bed Bug Exterminator
Heat treatment and chemical protocols for complete bed bug elimination.
Learn MoreWhat Clients Say About Our Ant Extermination Service
Real feedback from Montreal homeowners and businesses we've helped.
“Carpenter ants were destroying my deck and window frames. Blackline found the main nest inside my wall, treated it directly, and applied a perimeter spray. No ants since and the st...”
“Pavement ants invading my kitchen every spring for years. Blackline did a perimeter treatment and gel bait application. First spring in 4 years with zero ants inside. Incredible di...”
“Found winged carpenter ants inside — a sign of a mature colony. Blackline responded same day, located the nest in my basement wall, and treated it. Follow-up confirmed complete eli...”
“Ants everywhere in spring. Blackline identified two species — carpenter ants and pavement ants — and treated both with different methods. Thorough and professional. No ants after t...”
“Good service. Needed two treatments for the carpenter ants but they came back at no charge for the second visit. Technician was knowledgeable and explained the biology of the infes...”
“Odorous house ants in my kitchen — impossible to get rid of with store products. Blackline used gel bait that the ants carried back to the colony. Gone within a week. Wish I had ca...”
Free inspection · No obligation · Same-day available
Request a Free Inspection & Quote
Same-day appointments available. No obligation. We respond within 2 hours during business hours.
All Pest Control Services
Service Areas
Ready to Eliminate Ants from Your Property?
Same-day service available. Free inspection. 100-day guarantee. Our certified technicians are standing by to help you reclaim your home.
Serving Montreal, Laval, Longueuil, Brossard, and all surrounding areas.