Don't leave keys "hidden" outside the home. Leave an extra key with a trusted neighbor or colleague.
Have window locks installed on all windows and on your fuse boxes and external power sources.
Keep at least one fire extinguisher on each floor, and be sure to keep one in the kitchen. Show family members and household help how to use them.
A family dog can be a deterrent to criminals. But remember, even the best watch-dog can be controlled by food or poison. Do not install separate "doggy doors" or entrances. They also can admit small intruders.
Consider purchasing timers to turn on outside and inside lights automatically at various times throughout the night.
The decision to set the automated alarm system may vary from region to region. Power outages and brownouts may trip alarm systems. Check with your security officer for advice on setting alarm systems when you are away for long periods of time.
All entrances, including service doors and gates, should have quality locks--preferably deadbolt.
If you have burglar or intrusion alarms, check and use them.