Our insurance adjuster made us install a hand railing along our basement stairs because of a recent court case in which a thief slipped and broke his leg. He was arrested and convicted, but sued the homeowners for negligence and won a substantial settlement. Maybe you would like to listen to these two legal opinions before you proceed.
Here is a good interview that pertains to self-defence in the home:
Jack Spirko of The Survival Podcast interviews Massad Ayoob on Lethal Force Aftermath (Episode 1094) http://www.thesurvivalpodcast.com/episode-1094-massad-ayoob-on-lethal-force-aftermath
Here is a DVD that pertains to self-defence in countries that use Common Law (England, U.S.A., Canada, Australia, New Zealand): Peyton Quinn’s “Bulletproof Legal Defense” produced by ISCQC Production. There’s also a .PDF for download, but they want your e-mail address at http://stresshooting.com/index.php?option=com_content&view=article&id=35&Itemid=114