Many burglars enter homes by simply breaking glass windows.
A good deterrent is to have better quality glass installed at vulnerable points around the perimeter of your residence. This type of glass adds additional strength to your windows. To gain entry, a burglar would have to strike the glass repeatedly in the same spot in order to make a small opening. Most burglars are reluctant to create this type of noise for fear of being detected. This causes a skin to form around the glass.