http://www.ipm.ucdavis.edu/QT/spiderscard.html

To prevent spiders from entering your house, take these steps:
  • Seal home foundation cracks and other access holes
  • Inspect window and door screens for good. seals that keep out spiders and the insects they prey on.
  • Keep areas around home foundations free of clutter.

Manage spiders using these tips:
  • Indoors, regular housecleaning provides adequate spider control.
  • Vacuum up the spider and its web.
  • Prevent clutter buildup that can provide hiding places.
  • Remove spider webs from the exterior of the house with a broom or high pressure hose.
  • Indoors, squash spiders or capture them in a jar and release them outdoors.