The Ultimate Guide to Crawling Insects in Toronto Homes

Toronto is known for its distinct, fluctuating seasons and its beautiful, historic neighbourhoods. But the combination of our extreme weather — freezing winters and humid summers — paired with the aging foundations of many older homes creates the perfect storm for unwanted guests.

If you're constantly battling crawling insects in your living spaces, you're not alone. These intruders are remarkably good at finding their way indoors in search of shelter, warmth, and food. In this guide, Nomore Pest breaks down the most common household pests in the GTA, why they're invading your home, and how to stop them for good.

Identifying the Most Common Basement Bugs in the GTA

Before you can effectively treat an infestation, you need to know exactly what's crawling across your floors. Here are the top three culprits found in Toronto homes.

1. House Centipedes

Often triggering immediate panic due to their appearance, house centipedes are fast-moving, yellowish-brown insects with up to 15 pairs of long, thread-like legs. They're technically beneficial because they hunt other insects — but seeing them dart across your basement or bathroom floor at night is deeply unsettling. They thrive in damp environments, and their presence is a strong sign that you have other pests in the home serving as their food source.

2. Silverfish

Silverfish are small, wingless insects with flat, teardrop-shaped bodies covered in silvery-grey scales, and they move in a rapid, fish-like motion. They're notorious for property damage because their diet is starches and carbohydrates — meaning they'll happily eat through wallpaper, books, old photographs, cardboard boxes, and even clothing.

3. Spiders

While most spiders in Ontario are harmless to humans, they're one of the most common household pests in the GTA. They prefer to build webs in undisturbed, dark corners of basements, attics, and garages. An abundance of spiders usually means there's a steady supply of other crawling insects nearby for them to feed on.

The Root Causes: Why Are They Inside?

Crawling insects don't wander indoors by accident — your home provides the specific conditions they need to survive and multiply. The three main attractants are:

• Excess moisture: Pests like centipedes and silverfish need high humidity to survive. Leaky plumbing, dripping faucets, poorly ventilated bathrooms, and damp basement corners act like a magnet for them.
• Cracks and gaps: Many older Toronto homes have shifting foundations, aging weatherstripping, and deteriorating caulking. This wear and tear creates microscopic entry points that crawling insects easily exploit.
• Darkness and clutter: Bugs are naturally reclusive. Cluttered storage rooms, stacks of old cardboard boxes, and unfinished basements give them the perfect safe spots to breed unseen.

Effective Prevention and Professional Control

To keep these pests out, you need to remove the environment they love. Here's how to protect your property.

Step 1: Moisture Control

The single most effective DIY step against basement bugs is reducing humidity.

• Invest in a high-capacity dehumidifier for your basement to keep moisture levels below 50%.
• Run exhaust fans during and after showers to clear out steam.
• Promptly repair any leaking pipes or sweating HVAC units.

Step 2: Seal and Declutter

• Use silicone caulking to seal cracks along your exterior foundation, baseboards, and around window frames.
• Replace cardboard storage boxes with tightly sealed plastic bins to cut off the food supply for silverfish.
• Keep basement floors swept and vacuumed to remove hiding spots and spider webs.

Step 3: Call the Professionals at Nomore Pest

Dehumidifiers and caulking are great for prevention, but they won't eradicate an existing, breeding population hidden deep inside your wall voids. Over-the-counter sprays only offer a temporary surface fix.

At Nomore Pest, we specialize in targeting crawling insects right at the source. Our licensed technicians carry out thorough structural inspections to locate hidden entry points and nesting zones, then use safe, targeted, family-friendly treatments that flush out centipedes, silverfish, and spiders — keeping your Toronto home clean, comfortable, and bug-free. It's the same source-first approach we use for our residential pest control customers across the GTA.