Extermination of Carpenter Ants Greater Montreal
Call a certified exterminator for carpenter ants
Calling a certified carpenter ant exterminator is essential to effectively eliminate a colony established in your home. Unlike DIY treatments that are often ineffective, a professional has access to specialized products and the right techniques to locate hidden nests and treat infested areas thoroughly.
At 911 Exterminateur, our technicians respond with speed, precision, and discretion, whether it’s a house, a business, or a multi-unit building. Every intervention begins with a targeted inspection to ensure a safe and long-lasting treatment.
Suspect an infestation? Request a free estimate today. Our teams operate throughout Greater Montreal, including the North Shore and South Shore.
An exterminator
near you
Our dispatch center directs your request to the nearest available team to ensure a rapid response, whether you are on the island, the North Shore, or the South Shore.
Montreal
South Shore
North Shore
Contact us for a quick estimate
Satisfied clients
Rapid response throughout Greater Montreal
Our team operates throughout Greater Montreal to quickly handle any carpenter ant infestation, whether in a private residence or a commercial building. Thanks to our network of strategically positioned certified technicians, we provide fast service in:
Montreal (Island)
all boroughs
South Shore
Longueuil, Brossard, Boucherville…
North Shore
Terrebonne, Blainville, Repentigny…
No matter your location, we guarantee a response within 24 hours in most cases. Travel and inspection are generally free, especially in urgent situations or when visible activity is high.
How to detect an infestation of carpenter ants?
Carpenter ants are often difficult to spot with the naked eye, especially when they’ve established a colony inside walls or wooden structures. Here are the most common signs of an active infestation:
- Presence of small pile of fine sawdust (often near baseboards or window frames)
- Large black ants seen indoors, especially at night
- Light sounds in walls (scratching or cracking)
- Wood appears weakened, unusual dampness near foundations
To learn more about how these pests build their nests, consult this educational guide from Espace pour la vie.
If you notice one or more of these signs, it is strongly recommended to have your property inspected by a professional before the damage becomes structural.
Our extermination method
Inspection, targeted treatment and prevention
Our approach is based on a rigorous three-step protocol designed to effectively eliminate carpenter ant colony and prevent their return:
Targeted inspection
Our technicians identify entry points, risk areas and the potential presence of secondary nests.
Professional treatment
We apply a registered insecticide (gel, powder or liquid), specifically formulated for carpenter ants, in accordance with the standards of Health Canada.
Personalized prevention
Concrete recommendations for sealing inlets, correcting moisture sources and preventing future reinfestation.
Each treatment is tailored to your situation - single-family home, multiplex or commercial premises - with follow-up if necessary. Our products are safe for children and pets when applied correctly.
Risks for your home
Damage, humidity and hidden colonies
Carpenter ants don’t just invade your space — they tunnel through wood, weakening load-bearing structures like beams, floors, and window frames.
Significant structural damage, costly to repair
Persistent moisture that promotes their spread
Hidden nests that are difficult to locate without specialized tools
A well-established colony can contain several thousand individuals. The longer the intervention is delayed, the worse the damage becomes — and so does the treatment cost.
How much does a carpenter ant treatment cost?
The cost of carpenter ant extermination depends on several factors: the extent of the infestation, the location of the nest, the type of building, and the preventive measures required.
In general, here are the price ranges observed:
Standard inspection and treatment between 250 $ and 450 $
Complex treatment (multiple nests or difficult access): up to 650 $
All our treatments are carried out by certified technicians using professional-grade products approved by Health Canada. Travel fees are waived in most cases.
Would you like more details on the techniques used, the duration of the effects, or the differences between a one-off treatment and a preventive plan? Consult the complete guide to carpenter ant prices and treatments.
Get a free quote within 24 hours
Our team is available 7 days a week to assess your situation and propose a suitable treatment against carpenter ants. The inspection is quick, discreet and free of charge in most cases.
Call us now or fill in our online form to receive a personalized estimate within 24 hours. We operate throughout the Greater Montreal area, including Montreal, Laval, the North Shore and the South Shore.
Frequently asked questions about carpenter ant extermination
How long does it take to completely eliminate an infestation?
In general, a single intervention is enough to eliminate the main colony. However, secondary nests may require a follow-up visit in the following weeks.
Do carpenter ants return after treatment?
No, if the source of the moisture is controlled and the entry points are sealed off. We always provide personalized preventive advice after every treatment.
Is it dangerous to live in an infested house?
Carpenter ants don't transmit disease, but they can weaken the structure of your home over time, especially if the infestation is advanced.
Should I leave the house during treatment?
No. The products used are safe and applied in a targeted manner. You can stay on site, unless specifically instructed by the technician.
When is the best time of year to treat carpenter ants?
Spring is often the time when activity is most visible, but colonies are active indoors all year round. As soon as signs appear, it's time to take action.