Mouse Control and Mice Removal in Scarborough

Mouse control in Scarborough is two jobs done together: trapping the mice already inside, and closing the gaps they used to get in. A treatment that only lays bait removes this month's mice while leaving the road open for next month's. Most Scarborough mouse jobs run $200 to $500, need one visit plus a follow-up, and carry our two-month guarantee. If you are hearing scratching in the walls after dark or finding droppings under the sink, that is a mouse, and fall is when they come indoors.

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What are the signs of mice in your home?

The signs of mice are rice-sized dark droppings along walls and in the backs of drawers, scratching and scurrying in the walls and ceiling after dark, gnaw marks with shredded nesting material, and greasy rub marks where they run the same path each night.

What to look and listen for:

• Droppings the size of a grain of rice, dark and pointed, along baseboards, in drawers, and at the back of cupboards.
• Night scratching in the walls and ceiling, loudest once the house goes quiet.
• Greasy brown rub marks along baseboards and entry holes from the oil in their fur, the mark of a route run night after night.
• Gnaw marks on food packaging, wood, and wiring, plus small nests of shredded paper or insulation.
• A musky, ammonia smell in a pantry, closet, or cupboard.

As the nights cool, mice push into the postwar Birch Cliff, Cliffside, and Wexford bungalows through pencil-width gaps around pipes and worn door sweeps. Small, pointed droppings mean mice; blunt droppings roughly three times the size mean rats, and a different plan.

Why you suddenly have mice (and why it is almost always fall)

Mice head indoors as soon as the nights turn cold, which across Scarborough runs September through December. A house mouse only needs a gap the width of a pencil, about 6 millimetres, to slip inside, and Scarborough's postwar bungalows, back-splits, and side-splits offer plenty: the gap where the gas line enters, a worn garage door sweep, the weep holes in brick, a soffit corner, an aging foundation that has settled and cracked. One warm wall and a food source and they settle in for winter, breeding the whole time. A single female can produce five to ten litters a year. That is why "I only saw one" turns into a real problem fast, and why the fall call is the cheapest call.

A mouse problem is an entry problem. Kill the mice without sealing the gaps and you have bought yourself a monthly subscription, not a solution.

The signs it is mice, not something else

• Droppings the size of a grain of rice, dark and pointed, usually along walls, in the back of cupboards, or under the kitchen sink.
• Scratching or scurrying inside walls and ceilings, loudest at night when the house is quiet.
• A musky, ammonia smell in an enclosed space like a pantry or a closet.
• Gnaw marks on food packaging, baseboards, or wiring, and small piles of shredded paper or insulation where they nest.
• A greasy smudge along a baseboard or entry hole, from the oil in their fur on the same path run night after night.

Mouse droppings are small and pointed; rat droppings are three times the size and blunt. If the droppings are big, read the rat control page instead, because the plan is different.

How we actually clear them

1. Inspection (free). We find the runs, the nest areas, and every entry point, inside and out. This is the step that decides whether they come back.
2. Trapping and treatment. We place traps and, where appropriate, tamper-resistant bait stations that keep the product away from pets and children. Health Canada's rules require rodenticide near homes to be used in these locked stations, and we follow them. See the PMRA guidance on rodenticide safety.
3. Exclusion, the part that lasts. We seal the entry points with steel wool, hardware cloth, and sealant that a mouse cannot chew through. This is what turns a treatment into a fix.
4. Follow-up. We come back to clear traps, confirm the activity has stopped, and check the seals held.

Mice nest removal: what comes out, and how

Mice nest removal in Scarborough means finding the nests, taking out the shredded material and droppings without stirring them into the air, and sealing the spot so a new family does not move into the same warm corner. Mice build close to food and heat: behind the stove and fridge, under the dishwasher kick plate, in the bottom of a kitchen cabinet, in the insulation above an attached garage on a Woburn or Agincourt back-split, and along the box sill where the floor joists sit on the foundation. A nest looks like a loose ball of chewed paper, fabric, and pink or yellow fibreglass, usually with droppings packed around it.

Reachable nests come out once the mice are trapped, along with the soiled material around them. A nest closed inside a finished wall is usually left alone: once the mice are gone and the entry is sealed it is inert, and cutting open drywall rarely pays. Attic insulation that is heavily soiled is a job for an insulation contractor, and we will tell you when it has reached that point.

If you are cleaning up yourself, follow the Public Health Agency of Canada's hantavirus clean-up advice. Never sweep or vacuum mouse droppings; spray them and the nest with disinfectant or 1 part bleach to 9 parts water, let it soak 10 minutes, then wipe up wet. Wear rubber or plastic gloves and double-bag the waste.

Do you need a pro, or can you do it yourself?

A single mouse caught in a trap, with no droppings and no scratching, is often a one-off you can manage yourself with a few snap traps and a tube of sealant. Call a pro once you are seeing droppings in more than one room, hearing activity in the walls, or catching mice faster than you can reset the traps. That means they are breeding inside, and store-bought traps alone will not out-pace them. Our honest do-I-need-an-exterminator guide walks through the line.

Keeping them out for winter

The mouse-proofing that earns its keep: a door sweep on the garage, steel wool packed into the gap where pipes and wires enter, quarter-inch hardware cloth over weep holes and vents, and food kept in glass or hard plastic rather than the cardboard boxes mice chew straight through. Because Scarborough is part of the City of Toronto, the Toronto property standards bylaw applies here too and requires properties to be kept free of rodents, and sealing is how you meet that without poison.

Mice in the walls in late October: what to do this week

The end of October is when Scarborough households start hearing mice in the walls and ceilings at night. The first sharp cold sends house mice out of the ravine edges along Highland Creek, the Rouge and the Bluffs, and out of backyards and gardens, toward the nearest warm wall. Health Canada puts the gap a mouse needs at the size of a dime (Health Canada, rats and mice).

How to get ahead of it before the ground freezes:

• Bungalows, back-splits and side-splits. Check the low points first: settled foundation corners, the basement window wells, and the gas meter entry. On a split-level, look hard at the joint where the lower level meets the upper one; it is a common gap.
• Basement floor drains. Toronto's Municipal Code Chapter 629 applies in Scarborough and requires floor drains to be screened with a metal grill (section 629-37). An uncovered drain in an older Scarborough basement is an easy way in.
• If they are already in the wall, trap, do not poison. A mouse that takes bait often dies inside the cavity, and you get a smell you cannot reach. Snap traps where they come out of the wall, under the sink, behind the stove and along the basement walls, then seal the outside once the catches slow down.
• Apartment towers. In a building of three or more storeys and 10 or more units, RentSafeTO applies. Report mice to the landlord in writing first, then call 311 if nothing happens.

Doing this in late October is cheaper than doing it in February, when a few mice in a wall have become a colony through the walls and attic.

Common questions

Reviewed October 2026.

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