The reason store spray never fixes an ant problem is simple: it kills the ants you can see and leaves the queen and the colony untouched. Toronto homes deal with three common indoor ants: pavement ants, odorous house ants, and pharaoh ants. All three are worked from the nest out, with bait the workers carry back to the queen, not a wall of poison at the door. Most Toronto ant jobs run $150 to $300, take one visit plus a check-in, and come with our two-month guarantee. Ant season here runs April through September, and a trail across the counter in May is the cheap call.
our local line
Why you have ants, and why it is almost always spring to summer
Ants come indoors looking for two things: food and water. In Toronto that starts in April, when the ground warms and the colony wakes up, and it runs hard through September. A worker scouts, finds the crumbs behind your toaster or the moisture under the sink, lays a scent trail, and the rest of the colony follows the line. What looks like a sudden invasion is one nest outside that has decided your kitchen is the closest grocery store.
The species tells you the plan. Pavement ants nest under walkways, driveways, and slab foundations, and push up through cracks. Odorous house ants give off a rotten-coconut smell when crushed and love moisture, so they show up near dishwashers and leaks. Pharaoh ants are the hard ones: tiny, pale yellow, and they nest deep inside wall voids and warm buildings, common in condos and apartments.
Spraying pharaoh ants makes them worse, because the colony splits and scatters new nests through the building, a process called budding. That single fact is why the store can of spray backfires on the one ant that most needs a professional.
The signs it is ants, and which kind
- A steady trail of ants along a baseboard, counter edge, or windowsill, running to and from one point. A trail means a nest, not a stray.
- Ants around water: under the kitchen sink, behind the dishwasher, near a bathroom pipe. Odorous house ants in particular follow moisture.
- A faint rotten smell when you crush one. That is the odorous house ant, named for exactly that.
- Tiny pale-yellow ants in a hospital-like spread through a condo or apartment, in bathrooms and kitchens at once. That points to pharaoh ants, and it needs baiting, never spray.
- Small piles of soil pushed up between paving stones or along the foundation, the sign of a pavement ant nest below.
If the ants are large and black and you are finding coarse sawdust, that is a different problem. Read the carpenter ant control page, because those nest in your wood and the treatment is not the same.
Why the store spray fails, and what actually works
A can of spray kills foragers on contact and leaves a repellent line the survivors simply route around. The colony keeps producing hundreds more workers, and the queen never sees the product. You clear the visible trail for a day and it is back by the weekend.
Baiting works the other way. The workers take a slow-acting bait back to the nest and feed it to the queen and the brood before it acts, so the colony dies from the inside. It looks slower for the first few days on purpose. Here is how we run it:
- Inspection (free). We follow the trails to find where they enter and, where we can, the nest itself. We identify the species, because pharaoh ants and pavement ants are not baited the same way.
- Targeted baiting. We place bait the workers will actually carry, matched to whether the colony wants sugar or protein at that point in the season. Health Canada's Pest Management Regulatory Agency registers these products and evaluates their risk to children and pets before approval, and we apply them to the label.
- Perimeter and entry treatment where it fits. For pavement ants coming in from outside, we treat the exterior nest and entry points so the source is cut off, not just the indoor trail.
- Follow-up. We come back to confirm the trails are gone and the colony has collapsed, and re-bait if a satellite nest is still active.
Do not spray a pharaoh ant trail. It triggers budding, the colony splits, and a one-room problem becomes a whole-building one. If the ants are tiny and pale and spread through more than one room, stop spraying and call.
What ant control costs in Toronto
A standard Toronto ant treatment runs $150 to $300. The range depends on the species, how many nests are in play, and whether the source is one exterior nest or several inside a wall. A single pavement-ant trail from the driveway sits at the low end. A pharaoh ant infestation spread through a condo, needing repeat baiting, sits at the top.
| Job | Typical Toronto range |
|---|---|
| Single trail, one nest, general ants | $150 to $250 |
| Whole-home general ant treatment | $200 to $300 |
| Pharaoh ants / multi-nest baiting program | $300 to $450+ |
| Follow-up visit (included in most jobs) | usually no extra charge |
Carpenter ants are their own job and cost more, because finding the nest inside the structure is the real work. Those run $250 to $500 and are covered on the carpenter ant page. Every pest and its price is on the full cost page.
Do you need a pro, or can you do it yourself?
One short trail of pavement ants from a patio, caught early, is often a do-it-yourself job: wipe the trail to break the scent, seal the crumbs, and set a sugar-based bait station where you saw them. Give it a week. Call a pro when the trails keep coming back, when they are in more than one room, when they are the tiny pale pharaoh ants, or when spray has already been tried and failed. Those all mean an established colony you will not out-bait from the hardware-store shelf. Our honest do-I-need-an-exterminator guide walks the line.
Keeping ants out through the season
Ant prevention in Toronto is mostly moisture and food control. Fix the drip under the sink and the leaking hose bib, because odorous house ants track water. Wipe counters and keep sugar, honey, and pet food in sealed containers. Seal the obvious entry cracks along the foundation and around door frames with caulk. Keep mulch and firewood off the foundation, since that is where pavement and other outdoor ants nest before they find a way in. None of this kills a colony that is already inside, but it decides whether one comes back after we clear it.
Common questions
How do I get rid of ants permanently in Toronto?
Bait the colony so the queen is killed, then cut off the food and moisture that drew them in. Spray only clears the trail you can see and leaves the nest breeding, which is why the ants come back a few days later.
Why do I get ants every spring?
The colony outside wakes up when the ground warms in April and sends scouts looking for food and water. Your kitchen is the nearest source. It is a seasonal cycle, April through September, not a sign your home is dirty.
Are these ants dangerous?
Pavement and odorous house ants are a nuisance, not a health or structural threat. Pharaoh ants can carry bacteria across surfaces, which is why they are a real concern in condos and around food. None of them chew wood. The ones that damage wood are carpenter ants.
How long does ant treatment take to work?
Bait looks slow on purpose for the first three to five days, because the workers need to carry it back and feed the queen before it acts. Most trails are gone within one to two weeks, and a heavy pharaoh ant job can take a couple of baiting rounds.
Do I need to leave during ant treatment?
No. Baiting and targeted treatment do not require you to leave the home. If we apply any product, we tell you about any surface to keep clear and for how long, per the label.
Is one ant trail an infestation?
A single trail means one colony has found your home, which is enough to treat, but it is not a house full of nests. Caught in spring, it is the small, cheap job. Left through summer, it can branch into several.
Does the guarantee cover ants?
Yes. If ants are still active within two months of the treatment, we come back once at no charge.
Reviewed August 2026.
our local line
Straight pricing, no bait
Tell us the pest and your neighbourhood and we give you a price range on the spot. The inspection is free, and there is no charge to ask.
- Published price ranges, no "call for a quote"
- Free inspection, price locked before we start
- Licensed and insured technicians
- Two-month guarantee, one free re-treatment
- Honest advice if you do not need a pro yet
Toronto & the GTA · Same-day, 24/7 for emergencies
Get a straight quote
Tell us what you are seeing and we come back with a price range and a time. No obligation, no on-site surprise.