Pest Control Guide
Identify, prevent, and treat common household pests in Canada. Costs, seasonal risks, and professional vs DIY approaches.
Mice & Rats
$200–$600Most common in Canada. Entry through gaps as small as 6mm. Gnaw wiring (fire risk), contaminate food.
Carpenter Ants
$300–$800Structural damage to wood. Common in BC, Ontario, Quebec. Attracted to moisture-damaged wood.
Bed Bugs
$500–$1,500Difficult and expensive to eradicate. Multiple treatments often needed. Common in multi-unit buildings.
Wasps & Hornets
$150–$400Nests in eaves, soffits, and wall cavities. Allergic reactions possible. Professional removal recommended.
Cluster Flies
$100–$300Very common in rural Canada. Enter homes in fall to overwinter. Nuisance, not destructive.
Termites
$500–$3,000+Less common than in US but present in Southern Ontario, BC coast, and parts of Quebec/Manitoba.
Raccoons & Squirrels
$300–$1,000Attic damage, insulation contamination, roof/soffit entry. Humane removal required by law in most provinces.
Cockroaches
$200–$500Common in apartments and older homes. German cockroach most prevalent in Canada.
Pest Control for Canadian Homes
Canadian homes face unique pest challenges driven by our climate. Long winters drive rodents and insects indoors, while short but intense summers bring wasps, ants, and mosquitoes. Understanding seasonal patterns and taking preventive action is far more cost-effective than reactive treatment.
Seasonal Pest Calendar
Spring (March–May)
- Carpenter ants emerge and establish satellite colonies
- Wasps begin building nests in eaves and soffits
- Raccoons and squirrels seek attic nesting sites for young
- Cluster flies become active in wall voids
Summer (June–August)
- Wasp and hornet colonies peak in size
- Termite swarmers appear in southern regions
- Mosquitoes breed in standing water
- Spiders become more visible indoors
Fall (September–November)
- Mice begin seeking indoor shelter — peak entry season
- Cluster flies mass on south-facing walls
- Asian lady beetles invade homes
- Squirrels stock attics for winter
Winter (December–February)
- Mice and rats most active indoors
- Bed bug activity continues (indoor pest)
- Cockroaches thrive in heated spaces
Prevention: The Most Cost-Effective Strategy
- Seal entry points: Caulk gaps around pipes, wires, and foundations. Mice enter through openings as small as 6mm.
- Eliminate moisture: Fix leaks, improve drainage, ensure proper ventilation. Most pests need water.
- Proper food storage: Sealed containers, clean counters, secured garbage bins.
- Trim vegetation: Keep trees and shrubs 1–2 feet from the house. Branches are highways for pests.
- Firewood storage: Store at least 6 metres from the house, elevated off ground.
- Screen vents: Install hardware cloth over soffit vents, dryer vents, and plumbing stacks.
- Annual inspection: $100–$200 for a professional preventive inspection — catches problems early.
DIY vs Professional Treatment
DIY is suitable for: Minor mouse issues (snap traps), ant bait stations, cluster fly control, preventive sealing.
Call a professional for: Carpenter ants (structural risk), bed bugs (requires specialized treatment), wildlife removal (legal requirements), large rodent infestations, wasp nests in walls, and any recurring problem that DIY hasn't resolved.
Canadian Legal Considerations
- Wildlife: Raccoons, squirrels, skunks, and bats are protected in most provinces. Humane removal and exclusion is required — killing or relocating may be illegal.
- Pesticide restrictions: Ontario, Quebec, and some municipalities ban cosmetic pesticide use. Professional applicators may use restricted products.
- Rental properties: Landlords are generally responsible for pest control in rental units. Check provincial tenancy legislation.
Attic Issues
Moisture attracts pests to your attic.
Foundation Issues
Cracks in foundations are pest entry points.
Insurance Costs
Pest damage and your insurance coverage.