Spiders aren't usually considered pests. Even so, there are still many people who don't like the idea of creepy-crawlies invading their homes. Generally, the spiders you find hanging from your window aren't poisonous, but there are some types, like the false widow, that you shouldn't let into your house.
The UK is home to approximately 650 species of spiders. Insects and other prey in homes make spiders want to come inside homes. If the spider infestation is severe, we recommend putting the vacuum cleaner down and calling a spider control professional.