The American house spider is one of the most common spiders found inside Southern California homes, and thankfully, one of the least concerning. Adults are small, typically measuring about 1/4 to 3/8 inch in body length, with round, bulbous abdomens colored tan, brown, or dirty gray, often marked with darker chevron or mottled patterning. Their legs are thin and proportionally long compared to their body but noticeably shorter and less spindly than a wood spider or cellar spider. You’ll rarely see one out in the open — they prefer to hang upside down in the center of their signature messy, irregular “cobweb,” a tangled web very different from the neat, symmetrical wheel of an orb-weaver.
In LA and Orange County homes, American house spiders favor undisturbed corners: basements, garages, crawl spaces, closets, window wells, and the space behind furniture or storage boxes. Outdoors, they’ll build webs under eaves, in shed corners, and along fences. Because they thrive wherever insects gather, homes with existing ant, fly, or moth activity tend to see more of them, since those insects are their primary food source.
From a safety standpoint, American house spiders are considered harmless to people. They are shy, non-aggressive, and will typically retreat rather than bite. On the rare occasion a bite does occur, it’s generally described as comparable to a minor bee sting, with localized redness or discomfort that resolves on its own. As with any insect or spider bite, if you notice worsening symptoms or have concerns, it’s always best to check with a medical professional rather than self-diagnose. The bigger issue homeowners usually have with this species is the cosmetic nuisance of webbing accumulating in corners, garages, and eaves.
Guarantee Pest Control has been helping Los Angeles and Orange County families keep their homes spider-free since 1958. Our technicians know exactly where American house spiders like to hide and web up, and we’ll inspect your home’s vulnerable spots — garages, eaves, window wells, and storage areas — to recommend a treatment plan that fits your household, including our eco-friendly Guarantee Green options. If spider webs keep coming back no matter how often you clean them away, give us a call at 1-800-507-3787 or request a free estimate today. We offer no-penalty cancellation and a 3-month guarantee on most services, so you can feel confident in the results.