There are two types of poisonous spiders that can be found in the Vancouver and southern BC regions. The first is probably the more recognizable of the two, and is known commonly as a Black Widow Spider. The spiders are usually about three quarters of an inch long, and are completely black except for a unique red mark on their abdomen that resembles an hourglass. The Black Widow usually makes a web close to ground level, in sheltered areas like a pile of firewood. The other potentially dangerous spider is known as the Brown Recluse Spider. This spider is most commonly found in similar locations as a Black Widow Spider, and will usually prefer spending its days in a dark reclusive space. Like their name suggests, the Brown Recluse has a mostly brown body, while its abdomen is gray in colour. They are just over half an inch long, and actually have a mark on their back that resembles a violin.
Most spider species are beneficial to eliminating unwanted structural pests, however, an inspection is always recommended to control large infestations.