Mouse Exterminator Cost in Ontario: What You'll Actually Pay

Quick answer: In Ontario, professional mouse control typically costs $200–$600 for a standard home. A single-visit treatment runs $300–$400, a proper two-visit program with entry-point sealing runs $450–$600, and severe or long-standing infestations in larger homes can reach $800+. At Sani IQ, a single-visit treatment is $345 and our two-visit Complete Mice Protection program — the one we recommend for any active infestation — is $495, with exclusion sealing included on the second visit. The number that matters most isn’t the price of the visit; it’s whether the entry points get sealed. A cheap job that skips exclusion is a job you’ll pay for twice.

Scratching in the walls at 2 a.m., droppings behind the toaster, a chewed bag of rice at the back of the pantry — by the time most homeowners search “mouse exterminator cost,” the mice have been in the house for weeks. This guide breaks down what mouse control actually costs in Ontario, what the cheap quotes conveniently leave out, and how to tell whether you need a $345 visit or a full program.

What does a mouse exterminator cost in Ontario?

Here’s the realistic range across the province, based on what companies charge and what the job actually involves:

Situation	Typical Ontario range	What’s involved
Light, first-time activity	$300–$400	Inspection, interior/exterior baiting, monitoring
Active infestation (standard home)	$450–$600	Two visits: knockdown, then follow-up + sealing entry points
Severe / long-standing / large home	$800–$1,200+	Multiple visits, extensive exclusion, sanitation guidance
Ongoing protection plan	$845–$1,395/yr	Year-round coverage including rodents, quarterly service

At Sani IQ the pricing is published, which is rarer in this industry than it should be: $345 for a single-visit treatment when the activity is genuinely light and new, and $495 for Complete Mice Protection — two visits about three weeks apart, with entry-point sealing done on the second visit once activity has been knocked down. Year-round protection plans start at $845 and cover mice alongside the insects that show up the rest of the year.

Why the second visit and the sealing matter more than the price

A mouse infestation is a building problem wearing a rodent costume. A house mouse squeezes through a gap the width of a pencil — about 6 mm — and your home has more of those than you think: the gap under the garage door, the hole where the AC line enters, dryer vents, gaps in brick weep holes. (Our house mouse guide covers how to recognize them and the signs they leave.)

One-visit jobs kill the mice that are currently inside. They do nothing about the highway they used to get in. That’s why the industry’s dirty little secret is the $250 “treatment” that turns into three $250 treatments over a winter. When you compare quotes, the only question that separates them: is exclusion (sealing) included, and is there a follow-up visit to confirm activity has stopped? If the answer is no, you’re not comparing the same service.

What makes the price go up?

A few honest factors move a quote from the low end to the high end:

• How long the mice have been there. A months-old infestation means an established nest, multiple litters, and droppings/urine contamination that needs addressing — more visits, more work.
• Size and construction of the home. Century homes with fieldstone foundations (common in older parts of Barrie and across small-town Ontario) have far more entry points than a 2010s build with poured concrete.
• Attached garages and additions. The junctions are entry-point factories.
• Severity of exclusion work. Sealing three gaps is included in a program; screening an entire foundation’s weep holes or rebuilding a garage-door sweep is quoted separately by any honest company.

DIY vs professional: the actual math

Store-bought snap traps and bait stations will cost you $40–$80, and they do catch mice. The problem is arithmetic: a female house mouse produces 5–10 litters a year, 5–6 pups each. Traps that catch two mice a week don’t beat a reproduction curve like that, and DIY almost never includes finding and sealing entry points, which is the part that actually ends the problem.

Where DIY makes sense: a single mouse spotted in the garage in November, no droppings inside. Where it doesn’t: droppings in more than one room, noise in the walls, or activity that’s survived more than two weeks of trapping. At that point the $80 in traps is money spent on top of the professional visit you’ll book anyway — plus the contaminated insulation risk if a poisoned mouse dies in a wall void.

If you’re not sure which side of that line you’re on, our 60-second quiz will tell you honestly whether you need the single visit or the program — it quotes the same published prices either way.

Who pays — landlord or tenant?

In Ontario, under the Residential Tenancies Act, landlords are responsible for pest control in rental units, including mice, unless the infestation was demonstrably caused by the tenant. If you’re renting, report it in writing. If you’re the landlord, treat it fast — a mouse problem in one unit of a multiplex is a building problem within a month, and the treatment cost scales accordingly. This applies across the GTA and Durham — we handle a steady stream of rental and student-housing mice calls in Oshawa for exactly this reason.

What happens during a professional mouse treatment?

A proper program looks like this — and this is what a $495 program buys, so you can hold any quote to it:

1. Inspection — where they’re getting in, where they’re nesting, how established the population is.
2. Knockdown — tamper-resistant bait stations and trapping placed on the runways mice actually use (along walls, behind appliances), safe around kids and pets.
3. Follow-up (~3 weeks later) — confirm activity has collapsed, refresh stations.
4. Exclusion — seal the entry points found in step 1, so the next generation of field mice stays outside where it belongs.
5. Guarantee — at Sani IQ, if activity returns inside the guarantee window, so do we, at no charge.

Frequently asked questions

How much does it cost to get rid of mice permanently in Ontario? Budget $450–$600 for a two-visit program with exclusion — that’s the “permanent” tier. Single visits ($300–$400) treat the current population but leave the entrances open. Sani IQ’s Complete Mice Protection is $495 including sealing.

Is a mouse exterminator worth it? If there are droppings in more than one spot, yes. Mice breed faster than DIY trapping removes them, they contaminate food-prep surfaces (salmonella is the real health concern), and they gnaw wiring — an actual fire risk. The $495 program is cheaper than one electrician visit.

How do I know if the mice are gone? No new droppings, no noise, and untouched monitoring stations for two to three weeks. This is exactly what the follow-up visit verifies — flour patches and station checks, not guesswork.

Do mice come back after extermination? Not through sealed entry points. They come back through unsealed ones — which is why exclusion is the deciding line between a treatment that lasts and one that doesn’t.

Ready for a real number instead of a range? Call (705) 302-1887 or take the quote quiz — published pricing, no mystery fees.