Common House Spider
Parasteatoda tepidariorum
Common house spiders are yellowish-brown to gray spiders measuring 3/16 to 5/16 inch in body length with distinctive dark chevron markings on their abdomens. They build irregular, tangled cobwebs in corners, along ceilings, and in undisturbed areas. These harmless spiders are the most frequently encountered spider species in homes.
Habitat & Behavior
House spiders build webs in protected indoor areas including room corners, window frames, ceiling edges, basements, attics, closets, and garages. They prefer upper corners where walls meet ceilings and areas near light sources that attract prey insects. Outdoors, they inhabit eaves, sheds, and covered porches. Each spider maintains a single web and adds new silk daily, abandoning webs when prey becomes scarce.
Signs of Infestation
- Cobwebs in corners, along ceilings, and around windows
- Small brown spiders sitting in or near webs
- Multiple webs in basements, attics, or garages
- Round egg sacs wrapped in silk attached to webs
- Captured insects and debris in abandoned webs
Health & Property Risks
Common house spiders are harmless and actually beneficial by capturing flies, mosquitoes, and other nuisance insects. They rarely bite humans and their venom is not medically significant. However, their webs create an unsightly appearance and accumulate dust and debris. Large numbers indicate abundant prey insects and entry points that should be addressed. Regular web removal helps control populations.
Prevention Tips
- Regularly remove webs using a vacuum or duster
- Reduce prey insects by addressing other pest issues
- Keep outdoor lights off or use yellow bulbs that attract fewer insects
- Seal cracks around windows, doors, and foundation to reduce entry
- Reduce clutter in storage areas that provides hiding spots
- Ensure screens on windows and vents are in good repair
Professional Treatment Approach
Greenix's house spider control combines web removal with residual perimeter treatments to reduce spider and prey insect populations. We apply treatments to common spider harborage areas including wall/ceiling junctions, window frames, eaves, and around entry points. Our technicians identify and treat other pest insects that serve as spider food sources. For ongoing control, we recommend regular web removal and exterior perimeter maintenance to prevent spider entry.
Related Pests
Other common spiders you might encounter
Black Widow Spider
Black widow spiders are shiny black spiders with a distinctive red hourglass marking on the underside of their round abdomen. Females measure 1.5 inches including legs, while males are much smaller. These venomous spiders build irregular, tangled webs close to the ground. Only female black widows have medically significant venom.
Brown Recluse Spider
Brown recluse spiders are tan to dark brown with a distinctive dark violin-shaped marking on their back. They measure 1/4 to 1/2 inch in body length with legs extending total size to about 1 inch. Unlike most spiders which have eight eyes, brown recluses have six eyes arranged in pairs. These shy, reclusive spiders avoid human contact.
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