Extermination and control of spiders on the North Shore
At a glance: The good news is that in Quebec, no spider is dangerous to humans. But when they multiply in the house, their webs and their presence become disturbing. Spiders enter through cracks and are attracted to moisture and other insects they feed on. To control them: reduce humidity, seal openings, limit night lighting and eliminate their prey. In the event of an invasion, professional treatment solves the problem in the long term.
Safe, but invasive
If spiders multiply in your home, it is often a sign of another presence of insects. Dealing with the source means settling both.
Spider sheet in brief
| Arachnid type (no dangerous species in Quebec) | |
| Where it is found | Basements, damp corners, near light sources |
| Distinguishing sign | Webs and the presence of other insects (its prey) |
| Main risk | Nuisance (rare and benign bite) |
| Recommended Solution | Moisture Reduction, Sealing, and Prey Treatment |
Are spiders in Quebec dangerous?
No. All spiders produce venom to neutralize their prey, but no species present in Quebec is dangerous to humans. A bite only occurs if the spider feels stuck; it remains rare and benign (sometimes a temporary pain). Dangerous species (black widow, recluse) do not live in our climate.
Species found in the home
The most common are the wolf spider (lycosis), large and fast but harmless, the cellar spider, the house spider and the dolomede. They are mostly found in the basement, in dark, damp corners, and near light sources that attract their prey.
Why spiders enter the house
Three factors attract them: humidity (basements, bathrooms), food (other insects), and openings (cracks, torn screens, door bottoms). Outdoor lighting attracts insects at night… and therefore the spiders that hunt them.
How to Control and Prevent Spiders
- Seal cracks, repair screens and install weather stripping (see our caulking service).
- Reduce humidity : ventilate the basement and bathroom, repair leaks.
- Limit nighttime lighting or use motion sensor lights.
- Eliminate their prey : fewer insects in the house, fewer spiders (see our insect extermination page).
- Vacuum canvases, corners and behind furniture regularly.
When to call an exterminator
A lone spider does not warrant treatment, but a persistent or large presence often indicates an underlying insect infestation. An exterminator treats both spiders and their prey, and secures entry points. The CAA-Quebec guide on spiders confirms this approach.
FAQ — Spiders
Are spiders in Quebec dangerous?
Why are there so many spiders in my home?
How do you keep spiders away naturally?
Should you kill spiders?
Other pests we exterminate
Exterminateur Rive-Nord also deals with: bed bugs, wasps, fleas, flies, carpenter ants, cockroaches, as well as rodents and animal control.
A spider invasion to be solved?
Targeted diagnosis and treatment, everywhere on the North Shore of Montreal — Laval, Terrebonne, Blainville, Repentigny, Mascouche and the surrounding areas.