While most spiders are harmless to humans, some species like the black widow and brown recluse have venom that can cause serious reactions. However, spider bites are relatively rare as most spiders only bite when directly threatened or handled. The majority of household spiders actually benefit the environment by controlling other insect populations. That said, if you have venomous spiders in your home, professional control is recommended, especially for households with children, elderly individuals, or people with compromised immune systems.

Most common house spiders can bite, but rarely do unless they feel threatened or are accidentally pressed against skin. Their fangs are often too small to penetrate human skin, and their venom is typically not harmful to humans. When house spider bites do occur, they usually cause minor symptoms like mild pain, redness, or itching. However, if you experience severe symptoms after a suspected spider bite, such as intense pain, swelling, muscle cramps, or difficulty breathing, seek medical attention immediately as these could indicate a bite from a more dangerous species.

Spiders are generally more active during warm months (spring through fall), with peak activity occurring in late summer and early fall when many species reach maturity and mate. Most spiders are nocturnal, becoming more active during evening hours when they hunt for prey. Indoor spiders may be active year-round due to consistent temperatures, but you might notice increased activity in autumn as outdoor spiders seek shelter from cooling temperatures. You may also observe more spider activity after weather changes, such as heavy rains, that displace them from their usual habitats.

Spiders are primarily attracted to your home by food sources (other insects that spiders prey upon), shelter (undisturbed areas like attics, basements, and seldom-used rooms), moisture (many spider species prefer damp environments), entry points (cracks, gaps, and openings that allow easy access), and lighting (exterior lights that attract insects, which in turn attract spiders). Clutter provides hiding places, while indoor heating during colder months provides warmth. Addressing these attractants can significantly reduce spider populations in your home.

Professional exterminators use a multi-faceted approach to spider control that includes thorough inspection to identify spider species and harborage areas, web removal to physically eliminate existing webs and egg sacs, targeted treatments applied to cracks and hiding spots, perimeter treatments to create a protective barrier, dust applications in wall voids and attics, and monitoring to track activity. Recommendations for sealing entry points and follow-up treatments ensure long-term control. This comprehensive approach is more effective than DIY methods for persistent or severe infestations, especially when dealing with potentially dangerous species.