How to Get Rid of Mice in Your House: Ontario Step-by-Step Guide

How Mice Get Into Ontario Homes

Every mouse inside your house entered through an opening you probably cannot see. House mice can squeeze through a gap as small as 6 millimetres — roughly the diameter of a pencil. That gap could be where a gas line enters the foundation, where the dryer vent meets the exterior siding, or under a garage door that has settled just a few millimetres over the years. Understanding exactly how mice get in is the essential first step to keeping them out permanently.

Common Entry Points

The most frequent entry points in Ontario homes include gaps around utility penetrations (gas, water, electrical, cable), the foundation-siding junction, garage door seals, weep holes in brick veneer, dryer and exhaust vents, soffit and roof vents, deteriorating mortar joints in brick and stone foundations, gaps around window and door frames, and the space where decks and porches attach to the house. Older Ontario homes — particularly those built before modern air-sealing standards — have more potential entry points than newer construction, but no home is immune. Even newly built homes have utility penetrations and vent openings that mice can exploit.

Ontario Seasonal Patterns

Mouse pressure on Ontario homes follows a predictable seasonal cycle. Activity increases sharply in September and October as outdoor temperatures drop and food sources diminish. This fall migration drives the majority of new infestations each year. Activity continues through winter as mice established indoors remain active, breeding, and expanding their territory within the home. Spring brings a partial reversal as some mice move outdoors to access emerging food sources, but established indoor populations often remain year-round, particularly in homes with accessible food. Ontario's freeze-thaw cycles create additional entry opportunities as foundation materials expand and contract, opening and widening small gaps each winter. Climate change has extended the active season, with milder winters keeping mice active longer and giving them more time to locate entry points.

How Mice Move Through Your Home

Once inside, mice travel through wall cavities, ceiling voids, floor joists, and pipe chases — the hidden highway system that connects every part of your home. A mouse that enters at the foundation can reach the attic within hours by climbing inside wall cavities. They follow plumbing and electrical runs as travel corridors, which explains why mice appear in upper floors and attics even when entry points are at ground level. Mice establish multiple nesting sites and food caches throughout their territory, usually within 3 to 10 metres of their primary food source. This territorial pattern means that even a small number of mice can create the impression of a large infestation by leaving droppings, gnaw marks, and sounds across multiple areas of the house.

Signs of Mice in Your Home

Mice are nocturnal and avoid open spaces, so you rarely see them directly. The evidence they leave behind tells the story.

Droppings

Mouse droppings are the most common and reliable sign. They measure 3 to 6 millimetres, are pointed at both ends, and look like dark grains of rice. A single mouse produces 50 to 75 droppings per day, scattered along travel routes, near food sources, and inside drawers, cupboards, and storage areas. Fresh droppings are dark and slightly soft; old droppings turn grey and crumble when pressed. The number and distribution of droppings help estimate both population size and the areas of the house being used.

Sounds

Scratching, scurrying, and light gnawing sounds in walls, ceilings, and under floors — primarily at night — indicate mouse activity. The sounds are usually light and quick compared to the heavier thumping associated with rats. Pay attention to which walls or ceilings produce sound, as this narrows down the travel routes and nesting areas.

Gnaw Marks and Damage

Mice gnaw on food packaging, wood, drywall, insulation, and electrical wiring. Look for small, clean-edged holes in food containers, shredded paper or fabric (nesting material), and small scratch marks along baseboards and around entry points. Mouse gnaw marks are small — typically less than the width of a dime — compared to the larger, rougher damage caused by rats.

Tracks, Rub Marks, and Odour

In dusty areas, you may see tiny footprints with tail drag marks along travel routes. Unlike rats, mice do not typically leave visible grease rub marks on walls. However, a strong ammonia-like smell in enclosed spaces — closets, pantries, utility rooms — indicates concentrated mouse urine and suggests a significant or established population nearby. This odour intensifies over time and is a sign that the infestation has been present for weeks or more.

Nesting Material

Discovering shredded paper, fabric, insulation, or cardboard in wall voids, behind appliances, or inside stored boxes confirms active mouse nesting. Mice build nests from any available soft material within their territory, and finding nesting material means there is a breeding population, not just transient visitors. Nests are typically softball-sized or smaller, loosely constructed, and located near warmth — behind refrigerators, near water heaters, inside wall cavities near heating ducts, and within attic insulation. If you find a nest, there are almost certainly mice still active in the area even if you do not see them.

Step-by-Step Mouse Elimination

Effective mouse control requires a multi-step approach addressing the active population, their food supply, and their entry points simultaneously. Trapping alone without exclusion invites new mice through the same gaps. Sealing alone without trapping leaves existing mice inside your walls. The following five-step process, executed methodically over two to four weeks, eliminates the current infestation and prevents the next one. Skipping steps is the primary reason DIY mouse control fails — each step reinforces the others, and the approach works as a system rather than a menu of optional tactics.

Step 1: Inspect and Identify Activity Zones

Before setting a single trap, conduct a thorough inspection to map where mice are active. Check all kitchen areas (under sink, behind stove and fridge, inside drawers and cupboards), utility rooms, basement perimeter, attic insulation, and any cluttered storage areas. Look for droppings, gnaw marks, nesting material, and entry points. Note which areas have the most droppings — these are your primary trap zones. Check the exterior of your home for gaps, paying particular attention to the foundation line, utility penetrations, and ventilation openings.

Step 2: Set Traps in High-Activity Areas

Place snap traps along walls and in corners where droppings are concentrated. Position traps perpendicular to the wall with the trigger end touching the baseboard, so mice running along the wall encounter the trigger first. Set traps every 2 to 3 metres along confirmed travel routes. Use multiple traps — for a typical kitchen infestation, set 6 to 12 traps across the room. More traps catch mice faster and reduce the time the population has to breed.

Step 3: Remove Food Access

Transfer all pantry food into sealed glass or heavy plastic containers. Mice gnaw through cardboard, thin plastic, and paper packaging overnight. Clean up all crumbs and food debris. Store pet food in sealed containers and do not leave bowls out overnight. Empty kitchen garbage daily and use bins with tight-fitting lids. Eliminating easy food access makes trap bait the most attractive food option available, dramatically improving trap effectiveness.

Step 4: Seal Entry Points

While trapping addresses the mice already inside, exclusion prevents new ones from entering. Start with the most critical entry points — gaps around pipes, wires, and vents at the foundation level. Use steel wool or copper mesh packed into gaps and sealed with silicone caulk. For larger gaps (over 12 mm), use galvanized hardware cloth secured with screws and sealed around edges with caulk. Replace damaged door sweeps, repair torn screens, and seal gaps around garage doors. Work systematically around the building exterior, checking every penetration from ground level to the roofline.

Step 5: Monitor and Follow Up

Check traps daily. Remove caught mice, rebait, and reset. Track the number and location of catches — declining catches over a week indicate you are reducing the population. Continue trapping for at least two to three weeks after the last catch to ensure no mice remain. Inspect for new droppings weekly to confirm that your exclusion is holding and no new mice are entering.

Choosing the Right Trap

Not all mouse traps are equally effective. Here is how the main types compare.

Snap Traps

Traditional snap traps remain the gold standard for mouse control. They kill instantly when triggered correctly, allow visual confirmation of the catch, and can be reused multiple times. Modern snap traps come in plastic and metal designs that are easier to set and more consistent than older wooden models. Snap traps cost $1 to $5 each and should be purchased in quantity — you need multiple traps per room. Their main advantage is that you know exactly when and where a mouse was caught, giving you data to guide your overall strategy.

Electronic Traps

Electronic traps deliver a high-voltage shock that kills mice in seconds. They are enclosed, which means you do not see the dead mouse — an advantage for squeamish homeowners. An indicator light signals when a mouse has been caught. Electronic traps cost $20 to $60 each, are reusable, and are easy to empty. Their disadvantage is the higher per-unit cost, which limits the number you can deploy. Since multiple traps are more effective than a few, the snap trap advantage in quantity-per-dollar often outweighs the comfort benefit of electronic traps.

Live Traps

Live traps capture mice in an enclosed container without killing them. These are popular with homeowners who prefer humane options, but they come with practical complications. Captured mice must be released at least 2 kilometres from your home to prevent return — Ontario winters make outdoor release potentially fatal anyway. Live traps need to be checked frequently (every few hours) to prevent the trapped mouse from suffering or dying from stress and dehydration. They catch one mouse at a time and require handling the trap to release the animal. For anything beyond a single-mouse situation, live traps are impractical as a primary control method.

Glue Traps

Glue boards trap mice on an adhesive surface. They are considered inhumane by most pest control professionals and animal welfare organizations because they cause prolonged suffering — trapped mice may struggle for hours or days before dying. Glue traps also catch non-target animals and are messy to dispose of. Many Ontario pest control companies have stopped using them. Snap traps and electronic traps are more effective and more humane alternatives.

Best Bait for Mouse Traps

Bait choice significantly affects trap success. Mice are attracted to high-calorie, aromatic foods.

Top Bait Options

Peanut butter is the most effective and widely recommended bait. It is aromatic, high in fat and protein, sticks to the trigger (preventing mice from stealing it without triggering the trap), and inexpensive. Apply a pea-sized amount to the trigger — too much allows mice to eat from the edges without engaging the mechanism. Chocolate works well as a secondary option, particularly in situations where peanut butter is not producing results. Use a small piece pressed onto the trigger. Hazelnut spread (Nutella) combines the adhesive quality of peanut butter with the aroma of chocolate. Bacon bits and dried fruit provide protein and sugar-based alternatives when other baits are ignored.

Bait Mistakes to Avoid

Using cheese is the most common bait mistake — despite the cultural association, cheese is not particularly effective because it dries out quickly and is easy for mice to steal from triggers without springing them. Applying too much bait allows mice to eat without fully engaging the trigger. Not changing bait on traps that have been out for more than two days results in stale, unappealing bait that mice ignore. If traps are not catching mice after three to four days, change the bait type and check that traps are in the right locations.

Rotating Bait for Stubborn Populations

If peanut butter produces no results after several days despite droppings confirming activity in the area, rotate to a different bait. Try hazelnut spread, a small piece of beef jerky tied to the trigger, a cotton ball (mice collect soft materials for nesting and will pull at it, triggering the trap), or a small piece of candy. Different mice have different food experience based on what is available in your home — a mouse that has been feeding on pet food kibble may not be motivated by peanut butter but will investigate a piece of dried dog food secured to the trigger. The key is matching the bait to what the mice in your specific home are already seeking.

Where to Place Mouse Traps

Trap placement matters more than trap type. A perfectly baited trap in the wrong location catches nothing.

Placement Principles

Mice travel along walls, edges, and structural features rather than crossing open spaces. Place traps perpendicular to walls with the trigger end touching the baseboard. This positioning ensures that mice running along the wall in either direction encounter the trigger first. Space traps every 2 to 3 metres along walls where droppings are present. Concentrate traps in the heaviest activity areas — typically kitchens, pantries, utility rooms, and near identified entry points. Place traps behind appliances, under sinks, along basement walls, and in attic spaces where evidence of activity is found.

Trap Density

More traps are always better than fewer traps. A common mistake is setting two or three traps for an entire kitchen. Mice have small home ranges (3 to 10 metres) and may not encounter a trap that is not directly in their travel path. For an active kitchen infestation, set 8 to 12 traps covering all walls, under the sink, behind the stove and refrigerator, and inside lower cabinets where droppings are present. For a whole-house problem, 20 to 30 traps is not excessive. The investment of $20 to $50 in snap traps is trivial compared to the cost of an expanding infestation.

Elevated and Concealed Locations

Do not limit traps to floor level. Mice climb and travel along shelving, countertops, and inside cabinets. Place traps on shelves where droppings are found, inside drawers with evidence of activity, and on countertops behind small appliances. In attics, place traps along the edges where insulation meets the attic floor and near visible runways in the insulation. In basements, position traps along foundation walls and near utility penetrations. If you have an unfinished basement with exposed joists, check along the top of the foundation wall where the sill plate meets the concrete — this is a prime mouse highway and an excellent trap location. In kitchens, the narrow gap between the bottom of lower cabinets and the floor is frequently missed — slide traps underneath or pull out the kick plate to access this hidden travel corridor.

Sealing Entry Points: The Only Permanent Solution

Trapping removes mice that are already inside. Exclusion prevents new mice from entering. Without exclusion, trapping is a temporary measure that you will repeat every fall as new mice find the same entry points.

Exclusion Materials

Steel wool or copper mesh: Pack tightly into small gaps (6 to 12 mm) and seal with caulk. Mice cannot gnaw through metal mesh. Copper mesh is preferred in damp locations because it does not rust. Silicone caulk: Use exterior-grade silicone for sealing mesh in place and for filling small cracks. Latex caulk dries hard and may crack; silicone remains flexible through freeze-thaw cycles. Galvanized hardware cloth (6 mm mesh): Use for larger openings such as vents, weep holes, and gaps around pipes. Secure with screws and seal edges with caulk. Sheet metal: Use for door sweeps, kick plates, and reinforcing areas where mice have gnawed through softer materials. Concrete and mortar: Use for permanent repairs to foundation gaps and deteriorating mortar joints.

Materials to avoid: expanding foam alone (mice gnaw through it within hours), caulk without mesh backing (ditto), plastic screening (insufficient), and wood (mice gnaw through it). Every exclusion repair should include a gnaw-proof material — mesh, metal, or concrete — as the primary barrier.

Priority Entry Points

Focus your exclusion work on these locations in order of priority. First, seal all utility penetrations at the foundation level — gas lines, water pipes, electrical conduits, and cable entries. These are the most common entry points and the easiest to seal with steel wool and caulk. Second, address the foundation-siding junction by inspecting the entire perimeter for gaps. Third, check and seal around all exhaust vents (dryer, bathroom fan, range hood) — install pest-proof vent covers with built-in dampers. Fourth, inspect weep holes in brick veneer and install stainless steel weep hole covers that allow ventilation while blocking rodent entry. Fifth, check garage door seals, threshold sweeps, and side gaps — replace worn weatherstripping and install brush or rubber seals on the bottom and sides.

Professional Exclusion

Professional mouse exclusion services in Ontario cost $500 to $1,500 depending on the number and complexity of entry points. A professional inspection identifies gaps that homeowners typically miss — inside attic soffits, at roof-wall junctions, behind siding overlaps, and at locations only accessible with ladders. Professional exclusion work includes detailed documentation of every sealed point and typically comes with a warranty (one to two years) guaranteeing the work against rodent re-entry. For homes with chronic mouse problems that recur despite DIY efforts, professional exclusion is the most cost-effective long-term investment.

Safe Cleanup After Mice

Mouse droppings, urine, and nesting materials are health hazards that require proper handling. This is especially important in rural Ontario where deer mice carry hantavirus.

Standard Cleanup Protocol

Never vacuum or sweep mouse droppings dry — this aerosolizes particles that can be inhaled. Instead, ventilate the area by opening windows for 30 minutes before beginning cleanup. Spray droppings, urine stains, and nesting materials with a disinfectant solution (one part bleach to ten parts water or a commercial disinfectant). Let the solution soak for five minutes. Wearing rubber or nitrile gloves, wipe up droppings and debris with paper towels and dispose of everything in a sealed plastic bag. Mop hard floors with disinfectant after removing visible debris. Wash hands thoroughly with soap and hot water after removing gloves.

Hantavirus Precautions for Rural and Cottage Properties

If you are cleaning a cottage, cabin, garage, shed, or rural outbuilding that has been closed for weeks or months, assume deer mice may have been present and take full hantavirus precautions. Deer mice are the primary carrier of hantavirus in Ontario, and the virus is transmitted through inhalation of aerosolized particles from droppings and urine. Wear an N95 respirator (not a surgical mask — it must be N95 rated). Open all windows and doors and ventilate the space for at least 30 minutes before entering to work. Spray all surfaces, droppings, and nesting materials with disinfectant before disturbing them. Double-bag all contaminated materials. Wash all clothing worn during cleanup in hot water immediately afterward.

Insulation Replacement

If mice have nested extensively in attic insulation, the contaminated insulation may need to be removed and replaced. Mouse-damaged insulation loses thermal performance because tunnelling and nesting compresses the material, and the urine and droppings create ongoing odour and allergen issues. Professional insulation removal and replacement costs $2,000 to $5,000 for a typical Ontario attic, depending on square footage and insulation type. Some Ontario pest control companies offer combined rodent remediation and insulation services. If the contamination is limited to a small area, targeted removal of the affected section may be sufficient rather than complete replacement.

Professional Mouse Control in Ontario

Professional pest control adds expertise, equipment, and materials that DIY approaches lack.

What Professionals Do Differently

Licensed technicians begin with a thorough inspection that identifies all active areas, entry points, and contributing conditions. They use professional-grade snap traps, bait stations, and monitoring devices placed strategically based on their assessment. For exterior treatment, professionals deploy tamper-resistant bait stations containing commercial rodenticide — products not available to consumers — positioned along the building perimeter to intercept mice before they enter. Interior treatment focuses on trapping rather than poison to avoid the problem of mice dying in walls. Comprehensive exclusion seals all identified entry points using commercial materials and techniques. Follow-up visits assess results, adjust placement, and address any remaining activity.

Ontario Pricing

Initial mouse control programs (inspection, trapping, basic exclusion) cost $200 to $500 in Ontario. This typically includes two to three visits over four to six weeks. Comprehensive exclusion adding complete entry-point sealing costs $500 to $1,500 additionally. Ongoing quarterly monitoring programs cost $150 to $300 per year and include inspections, bait station maintenance, and proactive re-sealing as needed. For properties with severe infestations involving wall void nesting and insulation contamination, full remediation programs (trapping, exclusion, cleanup, insulation replacement) can cost $3,000 to $7,000. Most companies offer free or low-cost initial inspections, making professional assessment accessible even if you ultimately decide to handle the trapping yourself.

Choosing a Company

Verify that the company is licensed under Ontario's Pesticides Act and that technicians hold current Structural Extermination applicator licences. Ask about their specific approach to exclusion — a company that traps but does not seal entry points is providing temporary relief, not a solution. Request a written treatment plan with clear scope, timeline, and warranty terms. Check whether the warranty covers re-treatment if mice return within the specified period. Reputable companies provide detailed inspection reports documenting every finding and every sealed entry point. Ask specifically how many entry points they typically find in homes similar to yours — experienced operators find 15 to 30 or more entry points in a typical older Ontario home, compared to the three or four that most homeowners identify on their own. That gap between amateur and professional detection is exactly why DIY exclusion so often fails to stop recurring infestations.

How Long Does It Take to Get Rid of Mice?

With an aggressive, well-executed plan, most mouse infestations resolve within two to four weeks.

Week 1: Highest Activity

The first week of trapping typically produces the most catches as the existing population encounters the newly placed traps. Because mice are curious rather than neophobic (unlike rats), they approach traps quickly — often on the first night. Expect the majority of your total catches in the first five to seven days. This is also when you should be sealing the most critical entry points to prevent new mice from replacing caught ones.

Weeks 2-3: Declining Activity

If trapping and exclusion are effective, catches should decline steadily through weeks two and three. Traps may go several days without a catch, then produce one or two more as remaining mice shift routes. Continue monitoring and maintaining traps. Complete any remaining exclusion work during this period.

Week 4+: Confirmation

After two weeks with no new catches and no fresh droppings, you have likely eliminated the active population. Continue monitoring for at least two additional weeks to confirm. If catches suddenly increase after a quiet period, new mice have found an unsealed entry point — re-inspect the exterior and address the gap.

Factors That Extend the Timeline

Severe infestations with multiple nesting sites take longer than minor ones. Incomplete exclusion allows replacement mice to enter continuously, turning the project into an endless cycle. Insufficient trap numbers mean the trapping effort is too slow to keep pace with reproduction. Accessible food sources (unsealed pantry food, pet food left out, open garbage) reduce the effectiveness of trap bait. Each of these factors is under your control — addressing them shortens the timeline; ignoring them extends it indefinitely.

Multi-unit buildings present unique timeline challenges. If your neighbour has mice and the shared wall has gaps at utility penetrations or plumbing risers, eliminating mice in your unit alone provides only temporary relief. Mice will re-enter from the adjacent unit through the connecting infrastructure. This is why apartment and condo residents in Ontario often need building management to coordinate a building-wide response — treating individual units in isolation rarely produces lasting results in connected structures. If you are in a rental property, your landlord has a legal obligation under Ontario's Residential Tenancies Act to address pest infestations as a maintenance issue.

Signs the Mice Are Gone

Knowing when the problem is resolved prevents both premature celebration and unnecessary ongoing treatment.

Positive Indicators

No new droppings for two consecutive weeks is the strongest indicator. Check the areas where droppings were previously concentrated — kitchen drawers, under sinks, behind appliances, along basement walls. Place small pieces of paper or flour dust in suspected travel areas; if these remain undisturbed for two weeks, mice are no longer active. Traps remain untriggered and unbaited for two weeks. No scratching, scurrying, or gnawing sounds for two weeks. No new gnaw marks on food packaging or materials.

False All-Clear Signals

Do not assume mice are gone just because sounds stop — mice are quieter in warm weather when they may be nesting outdoors. A brief pause in trap catches followed by new activity indicates survivors that were temporarily avoiding traps. Finding old, grey, crumbly droppings but no fresh dark ones is a good sign, but continue monitoring for at least two more weeks before declaring the problem resolved. Seasonal fluctuations can create temporary reductions in activity that homeowners mistake for elimination.

The Final Confirmation Test

For definitive confirmation, place small piles of flour or baby powder at several locations where activity was heaviest. Check after 48 hours — any mouse activity will leave visible tracks and disturbance in the powder. Repeat this test two weeks later. If both tests show no disturbance, the mice are gone. This method is more reliable than absence of droppings alone because a single surviving mouse may produce few droppings if food access is limited, but it cannot cross a flour patch without leaving evidence. Keep your exclusion sealed, traps maintained, and monitoring active regardless — the goal is permanent prevention, not a one-time fix.

Common Mistakes When Dealing with Mice

These errors are responsible for the majority of failed DIY mouse control efforts.

Not Enough Traps

Setting two or three traps for an entire house is the single most common mistake. Mice have small territories and may never encounter a trap that is not in their specific travel path. You need traps every 2 to 3 metres along every wall where activity is confirmed. Invest in 10 to 20 snap traps for a standard home — they cost a few dollars each and are the most effective tool available.

Trapping Without Sealing

If you catch mice but do not seal entry points, new mice will enter through the same gaps. This creates an endless cycle of trapping that never resolves the underlying problem. Trapping and exclusion must happen simultaneously.

Using Poison Indoors

Rodenticide bait used indoors results in mice dying in inaccessible wall voids, producing severe odour for two to three weeks as the body decomposes. The smell permeates rooms and cannot be addressed without opening walls. Poison also poses secondary risks to pets and children. Use traps indoors and leave rodenticide for professional exterior bait station programs.

Relying on Repellents

Peppermint oil, mothballs, ultrasonic devices, and other repellents do not eliminate mice or prevent infestations. Scientific testing consistently shows that mice acclimate to these deterrents within days. Repellents may create temporary avoidance of a specific treated spot while mice use alternative routes through the same building. Do not waste time or money on products that do not work.

Ignoring the Exterior

Many homeowners focus exclusively on trapping inside the house while ignoring the exterior conditions that attract and allow mouse entry. Overgrown vegetation against the foundation, woodpiles against walls, accessible garbage, bird feeders, and unsealed exterior gaps all contribute to the problem. A complete mouse control strategy addresses both indoor elimination and outdoor conditions. Walk your property perimeter with fresh eyes: look for ground-level gaps, holes around pipes and wires, damaged vent covers, and any opening larger than 6 millimetres. If you find three or four obvious gaps, there are likely another dozen or more that you are not seeing — the ones hidden behind siding overlaps, inside soffit channels, and at roof-wall junctions that only become apparent from a ladder. This is the reality that drives most homeowners to invest in professional exclusion after failed DIY attempts.

Long-Term Prevention Strategies

Once you have eliminated an active infestation, these ongoing practices prevent recurrence.

Annual Exclusion Inspection

Inspect your home's exterior every August — before the fall migration season begins. Check all previously sealed points for degradation (cracked caulk, rusted steel wool, shifted materials). Inspect new potential entry points created by settling, weather damage, or renovation work. Re-seal any compromised points immediately. A 30-minute annual inspection prevents the most common recurrence scenario: mice finding a gap that opened since the last sealing.

Food and Waste Management

Store all food in sealed containers year-round, not just during active infestations. Keep garbage in closed containers. Do not leave pet food out overnight. Clean up birdseed spillage under feeders — or remove feeders if you have chronic mouse problems. Keep compost in enclosed bins. These habits remove the food incentive that makes your home attractive to mice. Without reliable food, mice are less likely to establish territorial nesting sites even if they find entry points.

Landscape and Structural Maintenance

Maintain a 60-centimetre clearance zone between vegetation and your foundation. Trim tree branches away from the roofline. Store firewood at least 6 metres from the building. Remove debris piles, unused garden materials, and stored items from foundation areas. Fix leaking outdoor taps and ensure drainage directs water away from the foundation. Keep grass mowed short near buildings. These landscape practices eliminate the shelter, moisture, and staging areas that mice use before finding entry points into the building.

Ongoing Monitoring

Keep a few snap traps set in high-risk areas (behind the stove, under the kitchen sink, in the basement near utility penetrations) as an early warning system. Check them weekly. A sudden catch after months of inactivity signals a new entry that needs to be found and sealed before a population establishes. This passive monitoring approach catches new incursions when they are single mice rather than established colonies, making control fast and inexpensive. For properties with recurring history, a professional monitoring program with quarterly inspections provides systematic oversight that catches problems early.

Frequently Asked Questions