Cellar Spider
Cellar spiders, often called daddy long-legs, are the most common indoor spider in Ontario homes. Long thin legs, small body, builds loose tangled webs in corners and ceilings.
Body about 6-10 mm. Legs extremely long and thin, often 4-5 times body length. Pale yellow to grey body. Webs are messy, irregular, and held high in corners — not the geometric orb of garden spiders.
Basements, garages, sheds, crawlspaces, and undisturbed corners of ceilings. They prefer dark, low-traffic areas with steady temperature. Often clustered in groups when conditions are right.
No. Cellar spiders cannot bite humans through skin and are not venomous in any medically significant way. The "daddy long-legs is the most venomous spider" claim is a myth.
Exterior perimeter treatment around the foundation, basement windows, and garage entry points dramatically reduces interior populations within 2 to 3 weeks. Established interior webs can be vacuumed away once activity drops.
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