House spiders are very common and are typically brown or tan with various markings. Their size varies and can reach 3/8″ in length. House spiders are those web-building spiders common in the corners and garages of most homes and buildings, and are responsible for most of the cobwebs found inside. Cobwebs are actually old webs that have collected dirt such that they become easily visible. These spiders are common in garages, crawl spaces and basements as these areas are less disturbed and tend to harbor more insects. Their bite is not dangerous, and therefore are not considered a threat to man.