Limit key distribution to sensitive areas. Change padlocks frequently. Be certain to change all access codes and to collect all keys when an employee leaves. Develop a closing plan where an assigned employee checks all doors and windows before leaving, including overhead doors. Often criminals are helped simply by leaving a door or window unlocked.
Alarm systems work well, especially ones with audible sirens.
If your business has a large amount of glass frontage, strong consideration should be given to glass breakage alarms. Burglars do not need a lot of time inside your building. Refrain from placing expensive items in show windows during non business hours. Keep ladders and high objects away from the sides of buildings to prevent burglars from getting on the roof and gaining entry. For businesses that are open 24 hours, the use of video surveillance cameras has proven to be a great crime prevention tool as well as crime solving tool.