PEST PREVENTION FIELD GUIDE

Spiders indoors: prevention and when to seek help

Most household spiders help control other insects and do not require pesticide treatment. Appearance alone cannot reliably establish whether a spider is medically significant.

Clues to look for

Look for webs near undisturbed corners, windows, basements, storage spaces, or garages. The species, location, and actual exposure risk determine the appropriate response.

Practical first steps

1. Reduce clutter and regularly remove abandoned webs using suitable tools.
2. Repair screens, weather-stripping, and accessible gaps; limit insects attracted to lights near entryways.
3. For an ordinary spider that can be safely relocated, use a container and stiff card without direct hand contact, if confident it poses no hazard.

What to avoid

Do not handle unidentified spiders or attempt to catch a suspected dangerous species. Avoid blanket pesticide spraying and unverified internet identification claims.

When to contact a professional

Seek a local pest or wildlife professional for suspected medically significant spiders or recurring unusual activity. Following a possible serious bite, seek urgent medical advice; call emergency services for severe symptoms.

Public-health and pesticide safety resources

Consult Health Canada's pest-control tips and your local public-health authority. If using a pesticide in Canada, confirm that it is registered with a Pest Control Products (PCP) registration number for the intended pest and location, and follow its full label directions.

This guide provides general educational information, not a definitive identification or inspection. Updated October 11, 2026.