9 ways to protect your home from burglary
"A deadbolt should be installed on every exterior entry door," says Melissa Richards, Home Depot's safety and security merchant, adding that the bolt should have a throw of at least one inch. Insurance companies and locksmiths recommend Grade 1 or Grade 2 American National Standards Institute deadbolt locks on exterior entryways.
The two main types of deadbolts are single and double cylinder locks. A single cylinder deadbolt, about $35, has a keyed opening on one side and a knob that can be turned by hand on the other. A double cylinder deadbolt lock, about $45, is keyed on both sides.
Richards says double cylinder locks should be used on a door with a glass section or one located near a window. "If the glass is broken and someone tries to reach in to open the door, they won't be able to."
Consult local building codes before buying new double cylinder deadbolt locks, though. Some communities don't allow their use due to safety concerns: They can impede a speedy exit from a home in case of fire. And when upgrading any entry door lockset, make sure that the strike plate is properly secured with strong 3-inch screws into the home's structural framing (studs).